CN111224402B - DC multi-microgrid system and control method - Google Patents
DC multi-microgrid system and control method Download PDFInfo
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- CN111224402B CN111224402B CN202010175097.5A CN202010175097A CN111224402B CN 111224402 B CN111224402 B CN 111224402B CN 202010175097 A CN202010175097 A CN 202010175097A CN 111224402 B CN111224402 B CN 111224402B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
- H02J1/12—Parallel operation of DC generators with converters, e.g. with mercury-arc rectifier
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/14—Balancing the load in a network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as AC or DC
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- H02J4/25—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
本申请提供一种直流多微电网系统及控制方法，包括总能源路由器、多个分中心能源路由器和多个户级路由器。总能源路由器用于将三相交流电和/或单相交流电转换为第一直流电和第二直流电，并输出三相交流电、单相交流电、第一直流电和第二直流电。每个分中心能源路由器均与总能源路由器电连接。分中心能源路由器设置有多组用于输出三相交流电或单相交流电、第一直流电和第二直流电的输出接口。每个户级路由器均电连接一组输出接口。户级路由器内的控制装置按照预设规则控制光伏发电装置、储能装置、三相交流电或单相交流电、第一直流电和第二直流电竞价输出以使负载正常运行。分中心能源路由器还用于协调各个户级路由器之间的电能流动。
The present application provides a DC multi-microgrid system and a control method, including a total energy router, a plurality of sub-center energy routers and a plurality of household-level routers. The total energy router is used to convert three-phase alternating current and/or single-phase alternating current into a first direct current and a second direct current, and output three-phase alternating current, single-phase alternating current, a first direct current and a second direct current. Each sub-center energy router is electrically connected to the total energy router. The sub-center energy router is provided with a plurality of groups of output interfaces for outputting three-phase alternating current or single-phase alternating current, a first direct current and a second direct current. Each household-level router is electrically connected to a group of output interfaces. The control device in the household-level router controls the photovoltaic power generation device, the energy storage device, the three-phase alternating current or single-phase alternating current, the first direct current and the second direct current bidding output according to preset rules to enable the load to operate normally. The sub-center energy router is also used to coordinate the flow of electric energy between each household-level router.
Description
Technical Field
The application relates to the technical field of micro-grids, in particular to a direct-current multi-micro-grid system and a control method.
Background
In the micro-grid, the AC micro-grid application is mainly used at present, the energy system of the micro-grid is established through photovoltaics, energy storage, diesel generators and the like, and the system realizes AC power supply through an inverter. Compared with the alternating current system, the direct current system has a great advantage, and the frequency, the phase and other control are not considered. Meanwhile, the system efficiency is effectively improved through direct current direct drive.
At present, a scheme for a direct current micro-grid is disclosed, wherein direct current is mainly established through a high-voltage bus, and meanwhile, power supply guarantee of a system is realized through two paths of looped networks, but the system is redundant and uneconomical due to the mode.
Disclosure of Invention
Based on the problems, such as redundancy and uneconomical performance of the system, the system is required to be provided with a direct current multi-micro-grid system and a control method for the existing direct current micro-grid system because direct current is established through a high-voltage bus and power supply guarantee of the system is realized through a two-path ring network.
A direct current multi-microgrid system comprising:
The input end of the total energy router is used for acquiring three-phase alternating current and single-phase alternating current respectively, and the total energy router is used for converting the three-phase alternating current and/or the single-phase alternating current into first direct current and second direct current and outputting the three-phase alternating current, the single-phase alternating current, the first direct current and the second direct current;
A plurality of sub-center energy routers, each of which is electrically connected with the output end of the total energy router, the sub-center energy router being provided with a plurality of groups of output interfaces, each group of output interfaces being used for outputting the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current, and
The system comprises a plurality of household level routers, a plurality of control units and a plurality of control units, wherein each household level router is electrically connected with a group of output interfaces, the output ends of the household level routers are used for electrically connecting loads, and the household level routers are used for acquiring the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current;
The household level router comprises a control device, a photovoltaic power generation device and an energy storage device, wherein the control device controls the photovoltaic power generation device, the energy storage device, the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid and output according to a preset rule so that the load normally operates;
The decentralized energy routers are also used for coordinating the flow of electrical energy between the individual consumer routers.
In one embodiment, the control device is configured to preferentially control the photovoltaic power generation device and/or the energy storage device to supply power to the load, and determine whether the power supply of the photovoltaic power generation device and the energy storage device meets the power consumption requirement of the load;
And if the power supply of the photovoltaic power generation device and the energy storage device does not meet the power consumption requirement of the load, the control device controls the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid and output so as to enable the load to normally operate.
In one embodiment, the source of the first direct current received by the customer level router is the first direct current directly output by the sub-center energy router or the first direct current output by other customer level routers;
The source of the second direct current received by the household level router is the second direct current directly output by the sub-center energy router or the second direct current output by other household level routers.
In one embodiment, the control device is electrically connected to the photovoltaic power generation device, the energy storage device and the decentralized energy router, and is further configured to obtain a remaining power of the energy storage device, and determine whether to control the energy storage device to discharge based on a power setting threshold.
In one embodiment, the control device is configured to compare the remaining power with the power setting threshold, and if the remaining power is greater than the power setting threshold, the control device controls the energy storage device to discharge, and if the remaining power is less than or equal to the power setting threshold, the control device controls the energy storage device not to discharge.
In one embodiment, the output interface includes an ac output interface, a first dc output interface, and a second dc output interface, and switching devices are respectively disposed in the ac output interface, the first dc output interface, and the second dc output interface, and each switching device is respectively used for controlling on and off of the ac output interface, the first dc output interface, or the second dc output interface.
In one embodiment, the decentralized energy router comprises:
And the branch center control device is respectively and electrically connected with the plurality of switching devices and the plurality of control devices, and is used for controlling the on and off of each switching device and coordinating the electric energy flow among the household routers through the switching devices.
In one embodiment, the total energy router comprises:
the first power grid input interface is used for acquiring the three-phase alternating current;
The second power grid input interface is used for acquiring the single-phase alternating current;
The input end of the three-phase alternating current/direct current conversion device is electrically connected with the first power grid input interface, and the output end of the three-phase alternating current/direct current conversion device is electrically connected with a plurality of the sub-center energy routers and is used for converting the three-phase alternating current into the first direct current;
A single-phase AC/DC conversion device with an input end electrically connected to the second power grid input interface, an output end electrically connected to the plurality of sub-center energy routers for converting the single-phase AC to the second DC, and
And the second end of the direct current/direct current conversion device is electrically connected with the output end of the single-phase alternating current/direct current conversion device and is used for converting the first direct current into the second direct current or converting the second direct current into the first direct current.
In one embodiment, the total energy router further comprises:
The photovoltaic power distribution interface is electrically connected with the output end of the three-phase alternating current/direct current conversion device;
the energy storage and distribution interface is electrically connected with the output end of the single-phase alternating current/direct current conversion device;
a first power grid output interface for outputting the three-phase alternating current, and
And the second power grid output interface is used for outputting the single-phase alternating current.
In one embodiment, the first direct current and the second direct current are different in voltage.
In one embodiment, the output end of the customer-level router is further provided with metering equipment for collecting electricity information.
A control method of a direct current multi-micro grid system is applied to the direct current multi-micro grid system described in any one of the embodiments, and the method comprises the following steps:
controlling the photovoltaic power generation device and/or the energy storage device to supply power to the load through the control device, and determining whether the power supply of the photovoltaic power generation device and the energy storage device meets the power consumption requirement of the load;
And if the power supply of the photovoltaic power generation device and the energy storage device does not meet the power consumption requirement of the load, controlling the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid and output so as to enable the load to normally operate.
In one embodiment, the step of controlling the photovoltaic power generation device and/or the energy storage device by the control device to supply power to the load and determining whether the power supply of the photovoltaic power generation device and the energy storage device is sufficient comprises:
controlling the photovoltaic power generation device to supply power to the load through the control device, and determining whether the output voltage of the photovoltaic power generation device meets the power consumption requirement of the load;
if the output voltage of the photovoltaic power generation device is determined to not meet the power consumption requirement of the load, acquiring the residual electric quantity of the energy storage device, and determining whether to control the energy storage device to supply power to the load or not based on an electric quantity set threshold;
And if the residual electric quantity is larger than the electric quantity set threshold value, controlling the energy storage device to supply power to the load, and determining whether the power supply of the photovoltaic power generation device and the energy storage device meets the power consumption requirement of the load.
Compared with the prior art, the direct-current multi-micro-grid system and the control method convert the three-phase alternating current and/or the single-phase alternating current into the first direct current and the second direct current through the total energy router, and output the three-phase alternating current, the single-phase alternating current, the first direct current and the second direct current to the plurality of sub-center energy routers. Each sub-center energy router outputs three-phase alternating current or single-phase alternating current, first direct current and second direct current to each household level router through a plurality of groups of output interfaces, so that one sub-center energy router can realize the access of a plurality of household level direct current micro-networks. Meanwhile, the control device in each household level router controls the photovoltaic power generation device, the energy storage device, the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid and output according to a preset rule so that the load normally operates, and the control device is matched with the sub-center energy routers, and the sub-center energy routers coordinate the electric energy flow among the household level routers, so that the ordered sharing of energy among the direct current micro-grids is realized, the problems of redundancy and uneconomical system are avoided, and the power supply stability and reliability of the direct current micro-grids are improved.
Drawings
Fig. 1 is a block diagram of a dc multi-micro grid system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a customer router according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a decentralized energy router according to one embodiment of the present application;
FIG. 4 is a schematic diagram of a total energy router according to an embodiment of the present application;
Fig. 5 is a flowchart of a control method of a dc multi-micro grid system according to an embodiment of the present application.
10. DC multi-micro grid system
100. Total energy router
101. Three-phase alternating current
102. Single phase ac
110. First power grid input interface
120. Second power grid input interface
130. Three-phase AC/DC conversion device
140. Single-phase ac/dc conversion device
150. DC/DC conversion device
160. Photovoltaic power distribution interface
170. Energy storage power distribution interface
180. First power grid output interface
190. Second power grid output interface
200. Sub-center energy router
201. AC output interface
202. First direct current output interface
203. Second direct current output interface
204. Switching device
210. Center-dividing control device
300. Home level router
301. Load(s)
302. Metering device
310. Control device
320. Photovoltaic power generation device
330. Energy storage device
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the application, which is therefore not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a dc multi-micro grid system 10, which includes a total energy router 100, a plurality of sub-center energy routers 200, and a plurality of customer level routers 300. The input ends of the total energy router 100 are used for obtaining three-phase alternating current 101 and single-phase alternating current 102 respectively. The total energy router 100 is configured to convert the three-phase alternating current 101 and/or the single-phase alternating current 102 into a first direct current and a second direct current, and output the three-phase alternating current 101, the single-phase alternating current 102, the first direct current and the second direct current.
Each of the sub-center energy routers 200 is electrically connected to an output of the total energy router 100. The decentralized energy router 200 is provided with a plurality of sets of output interfaces. Each set of the output interfaces is configured to output the three-phase alternating current 101 or the single-phase alternating current 102, the first direct current, and the second direct current. Each of the subscriber level routers 300 is electrically connected to a set of the output interfaces. The output of the consumer router 300 is used to electrically connect a load 301. The subscriber level router 300 is configured to obtain the three-phase alternating current 101 or the single-phase alternating current 102, the first direct current and the second direct current.
The subscriber level router 300 comprises a control device 310, a photovoltaic power generation device 320 and an energy storage device 330. The control device 310 is configured to control the photovoltaic power generation device 320, the energy storage device 330, the three-phase ac power 101 or the single-phase ac power 102, the first dc power, and the second dc power to perform bidding output so that the load 301 operates normally. The decentralized energy routers 200 also serve to coordinate the flow of electrical power between the individual consumer routers 300.
It is understood that the specific structure of the total energy router 100 is not limited, as long as it has a function of converting the three-phase ac 101 and/or the single-phase ac 102 into a first dc and a second dc and outputting the three-phase ac 101, the single-phase ac 102, the first dc and the second dc. In one embodiment, the total energy router 100 may be built up from a three-phase ac/dc converter, a single-phase ac/dc converter, and an air switch. The total energy router 100 may also be constructed from three-phase ac/dc converters, dc/dc converters, single-phase ac/dc converters, and voltage detection devices. In one embodiment, the specific voltage of the three-phase alternating current 101 may be 380V alternating current. In one embodiment, the specific voltage of the single-phase alternating current 102 may be 220V alternating current.
In one embodiment, the total energy router 100 is configured to convert the three-phase ac power 101 and/or the single-phase ac power 102 into a first dc power and a second dc power, which means that the total energy router 100 may convert the three-phase ac power 101 into the first dc power and then convert the first dc power into the second dc power, and the total energy router 100 may also convert the single-phase ac power 102 into the second dc power and then convert the second dc power into the first dc power. The total energy router 100 may also convert the three-phase alternating current 101 to the first direct current and the single-phase alternating current 102 to the second direct current. That is, no matter which conversion method is adopted by the total energy router 100, it is only necessary to ensure that the total energy router 100 can output the three-phase alternating current 101, the single-phase alternating current 102, the first direct current and the second direct current.
In one embodiment, the voltages of the first direct current and the second direct current are different. Specifically, the voltage of the first direct current may be selected according to actual requirements. For example, the voltage range of the first direct current may be 600V-750V. The voltage of the second direct current can also be selected according to actual requirements. For example, the voltage range of the second direct current may be 375-400V.
In one embodiment, the total energy router 100 further has a function of detecting whether the dc parameters such as voltage, current, power, and electricity of each output port are normal. Specifically, a controller is disposed in the total energy router 100. The output end of the total energy router 100 is provided with the three-phase alternating current 101 output port, the single-phase alternating current 102 output port, the first direct current output port and the second direct current output port, and each output port is internally provided with a voltage detection device. The respective port voltages are detected by the voltage detection device, and the detected respective port voltages are transmitted to the controller. And then comparing each port voltage with each output voltage threshold value through the controller, thereby determining whether each output port voltage is normal or not based on each comparison result, further avoiding phenomena such as undervoltage and the like, and ensuring the reliability of power supply.
In one embodiment, the voltage detection device may be replaced by other dc parameter detection devices (e.g., current detection device, power detection device, etc.). The total energy router 100 is monitored by a controller to provide electricity information of the router, thereby providing electricity for dispatching of the micro grid system.
It will be appreciated that the specific configuration of the decentralized energy router 200 is not limited, so long as it has the function of coordinating the flow of electrical power between the individual subscriber level routers 300. In one embodiment, the decentralized energy router 200 may be comprised of a decentralized controller, an ac/dc converter, and a plurality of contactors coupled to a power line. In one embodiment, the decentralized energy router 200 may also be comprised of a decentralized controller, an ac/dc converter, a plurality of micro-switches, and a plurality of contactors coupled to the power lines.
In one embodiment, the decentralized energy router 200 is provided with a distribution input interface. The three-phase alternating current 101 or the single-phase alternating current 102, the first direct current and the second direct current output by the total energy router 100 are accepted through a power distribution input interface. And then respectively separating the three-phase alternating current 101 or the single-phase alternating current 102, the first direct current and the second direct current into multiple paths of public bus distribution interfaces, and forming multiple groups of output interfaces. Each group of output interfaces comprises a first direct current public bus distribution interface, a second direct current public bus distribution interface and an alternating current public bus distribution interface, so that each group of output interfaces can output the three-phase alternating current 101 or the single-phase alternating current 102, the first direct current and the second direct current. In one embodiment, each common bus is provided with a micro-break switch. The micro-switch may be an air switch. In one embodiment, each of the micro-breaks Guan Mo is considered an on state.
Each of the subscriber level routers 300 is electrically connected to a set of the output interfaces. I.e. each of the decentralized energy routers 200 may implement multiple customer level dc microgrids (i.e. the customer level routers 300) access. The loop control of the sub-center controller in the sub-center router 200 can realize the loop network scene of different household-level direct current micro-networks, for example, the household-level direct current micro-network can select pure alternating current access, or alternating current-direct current access, or can select to realize direct current loop network access with other household-level direct current micro-networks.
It is understood that the specific structure of the control device 310 is not limited, as long as the control device has a function of controlling the photovoltaic power generation device 320, the energy storage device 330, the three-phase ac power 101 or the single-phase ac power 102, the first dc power and the second dc power to bid for output so that the load 301 operates normally. In one embodiment, the control device 310 may be a single-chip microcomputer. In one embodiment, the control device 310 may also be a control chip. In one embodiment, the control device 310 is electrically connected to the photovoltaic power generation device 320, the energy storage device 330, and the decentralized energy router 200, respectively.
It will be appreciated that the specific structure of the photovoltaic power generation apparatus 320 is not limited, as long as it has a photovoltaic power generation function. In one embodiment, the photovoltaic power generation device 320 may be composed of a solar panel and DC/DC. In one embodiment, the photovoltaic power generation device 320 may also be composed of a solar panel, an AC/DC mating controller. In one embodiment, the energy storage device 330 may be an energy storage battery.
In one embodiment, the control device 310 is configured to control the photovoltaic power generation device 320, the energy storage device 330, the three-phase alternating current 101 or the single-phase alternating current 102, the first direct current and the second direct current to bid for output to make the load 301 operate normally, i.e. the control device 310 is configured to control the photovoltaic power generation device 320 to supply power to the load 301 first. As shown in fig. 2, the control device 310 may control KM6, KM9, KM3, KM10, and KM11 to be on (where KM1, KM2, KM4, KM5, KM7, and KM8 are in an off state), that is, the photovoltaic power generation device 320 supplies power to the load 301.
In one embodiment, the control device 310 is configured to control on/off states of KM1, KM2, KM3, KM4, KM5, KM6, KM7, KM8, KM9, KM10, and KM11, respectively. KM1, KM2, KM3, KM4, KM5, KM6, KM7, KM8, KM9, KM10 and KM11 are controllable switching devices.
During the power supply process, the control device 310 monitors in real time whether the output voltage of the photovoltaic power generation device 320 meets the power consumption requirement of the load 301. Specifically, the control device 310 may monitor, through the DC/DC on the power supply branch of the photovoltaic power generation device 320, whether the output voltage of the photovoltaic power generation device 320 meets the power consumption requirement of the load 301. In one embodiment, the control device 310 may compare the output voltage of the photovoltaic power generation device 320 to the load voltage of the load 301. If the output voltage of the photovoltaic power generation device 320 is greater than or equal to the load voltage, it is determined that the output voltage of the photovoltaic power generation device 320 can meet the power consumption requirement of the load 301.
If the output voltage of the photovoltaic power generation device 320 is smaller than the load voltage, it is determined that the output voltage of the photovoltaic power generation device 320 does not meet the power consumption requirement of the load 301 at this time. The control device 310 may determine the remaining power of the energy storage device 330 at this time. Specifically, the control device 310 may obtain the remaining power of the energy storage device 330 through DC/DC on the power supply branch of the energy storage device 330, and compare the remaining power with a power setting threshold. If the remaining power is greater than the power setting threshold, the control device 310 controls the energy storage device 330 to discharge (i.e. controls KM7 to conduct) so as to make the load 301 operate normally, so that the home router 300 can implement internal power supply (i.e. self-sufficiency).
In one embodiment, if the power supplied by the photovoltaic power generation device 320 and the energy storage device 330 cannot meet the power demand of the load 301, the control device 310 controls the three-phase ac power 101 or the single-phase ac power 102, the first dc power and the second dc power to bid for output to make the load 301 operate normally. Specifically, the control device 310 may control the three-phase ac power 101 or the single-phase ac power 102, the first dc power and the second dc power to bid for output through each of the controllable switching devices (KM 1, KM2, KM4, KM5 and KM 8) so that the load 301 operates normally. In one embodiment, the control device 310 may also implement the three-phase alternating current 101 and/or the first direct current and/or the second direct current power supply via respective controllable switching devices.
For example, when the three-phase ac 101 is required to supply power, the control device 310 may control KM1, KM2, and KM9 to be turned on. When the first direct current is needed to supply power, the control device 310 can control the KM4, KM5 and KM9 to be conducted. When the second direct current is needed to supply power, KM8 can be controlled to be conducted through the control device 310. Meanwhile, the three power supply modes can be combined to supply power in any mode. That is, the load 301 may be powered by the three-phase alternating current 101 and/or the first direct current and/or the second direct current simultaneously.
In one embodiment, if the output voltage of the photovoltaic power generation device 320 does not meet the electricity consumption requirement of the load 301 and the control device 310 detects that the remaining power of the energy storage device 330 is less than or equal to the power setting threshold, the control device 310 controls the three-phase ac 101 or the single-phase ac 102, the first dc and the second dc to bid for output so that the load 301 operates normally.
In one embodiment, the control device 310 may also preferentially determine whether the remaining power of the energy storage device 330 meets the discharge requirement, if so, the control device 310 preferentially controls the energy storage device 330 to discharge (i.e. to supply power to the load 301), and if not, the control device 310 controls the photovoltaic power generation device 320 to supply power to the load 301.
In one embodiment, if the power supply of the photovoltaic power generation device 320 and the energy storage device 330 cannot meet the power demand of the load 301, the control device 310 is further configured to send the power demand to a sub-center controller in the sub-center energy router 200, and detect whether there is excess power in the other sub-center routers 300 through the sub-center controller.
Specifically, the hub controller may communicate data with the control devices 310 in the other home routers 300 to determine whether the other home routers 300 have excess power. If the other subscriber level routers 300 have redundant power, the central controller may electrically connect the subscriber level router 300 with the other subscriber level routers 300 having redundant power through the cooperation of the contactors and the switches in the subscriber level router 300, that is, provide power support to the current subscriber level router 300 through the other subscriber level routers 300 having redundant power, so that the load 301 operates normally. The function of coordinating the electric energy flow among the household level routers 300 through the branch center energy router 200 can be realized, so that the ordered sharing of the energy among the direct current micro-grids (namely, the household level routers 300) is realized, the problems of redundancy and uneconomical existence of the direct current multi-micro-grid system 10 are avoided, and the power supply stability and reliability of the direct current micro-grids are improved.
In one embodiment, when the other home level router 300 having the redundant power provides the power support to the current home level router 300, the output end of the other home level router 300 outputs the first direct current or the second direct current. As can be seen from the above description, the source of the first direct current received by the subscriber level router 300 may be the first direct current directly output by the sub-center energy router 200, or may be the first direct current output by another subscriber level router 300. Similarly, the source of the second direct current received by the customer level router 300 may be the second direct current directly output by the sub-center energy router 200, or the second direct current output by other customer level routers 300.
In one embodiment, the control device 310 is further configured to determine whether the dc parameters such as voltage, current, power, and electric quantity of each power supply branch are normal. Specifically, the control device 310 may detect the dc parameters of the respective power supply branches through a dc parameter detection device (ET/QT in fig. 2) on each power supply branch, and compare the detected dc parameters on each power supply branch with the dc parameter thresholds of the respective branches, so as to determine whether the dc parameters of the respective output power supply branches are normal based on the respective comparison results, thereby ensuring the reliability of power supply. In one embodiment, within the DC multi-microgrid system 10, a hierarchical output of voltages may be achieved by DC/DC, such as from 750V to 400V to 48V for final output to the load 301.
In this embodiment, the three-phase ac power 101 and/or the single-phase ac power 102 are converted into the first dc power and the second dc power by the total power router 100, and the three-phase ac power, the single-phase ac power, the first dc power and the second dc power are output to the plurality of the sub-center power routers 200. Each sub-center energy router 200 outputs three-phase alternating current or single-phase alternating current, first direct current and second direct current to each of the subscriber level routers through a plurality of groups of output interfaces, so that one sub-center energy router 200 can realize access of a plurality of subscriber level direct current micro-grids. Meanwhile, the control device 310 in each household level router 300 controls the photovoltaic power generation device 320, the energy storage device 330, the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid for output according to a preset rule so as to enable the load to normally operate, and the energy flow among the household level routers 300 is coordinated through the branch center energy router 200, so that the orderly sharing of energy among the direct current micro-grids is realized, and the power supply stability and reliability of the direct current micro-grids are improved.
In one embodiment, the preset rule includes that the control device 310 controls the photovoltaic power generation device 320 and/or the energy storage device 330 to supply power to the load 301, and determines whether the power supply of the photovoltaic power generation device 320 and the energy storage device 330 meets the power demand of the load 301. If it is determined that the power supplied by the photovoltaic power generation device 320 and the energy storage device 330 does not meet the power demand of the load 301, the control device 310 controls the three-phase ac power 101 or the single-phase ac power 102, the first dc power and the second dc power to bid for output so that the load 301 operates normally.
In one embodiment, the control device 310 is further configured to obtain a remaining power of the energy storage device 330, and determine whether to control the energy storage device 330 to discharge based on a power setting threshold. Specifically, the control device 310 may compare the remaining power with the power setting threshold, and if the remaining power is greater than the power setting threshold, the control device 310 may control the energy storage device 330 to discharge at this time. If the remaining power is less than or equal to the power setting threshold, the control device 310 controls the energy storage device 330 not to discharge.
In one embodiment, the output end of the customer-level router 300 is further provided with a metering device 302 for collecting electricity information. In one embodiment, the metering device 302 is an electricity meter. The electricity consumption is collected in real time by the metering device 302 to facilitate subsequent electricity statistics and predictions.
Referring to fig. 3, in one embodiment, the output interfaces include an ac output interface 201, a first dc output interface 202, and a second dc output interface 203. Switching devices 204 are disposed in the ac output interface 201, the first dc output interface 202, and the second dc output interface 203. Each of the switching devices 204 is configured to control on and off of the ac output interface 201 or the first dc output interface 202 or the second dc output interface 203, respectively.
In one embodiment, the switching device 204 may be a contactor. In one embodiment, the ac output interface 201, the first dc output interface 202, and the second dc output interface 203 are all provided with the switching device 204, which means that the ac output interface 201 is provided with the switching device 204, the first dc output interface 202 is provided with the switching device 204, and the second dc output interface 203 is also provided with the switching device 204. In one embodiment, each interface corresponds to a leg. Each branch is also provided with a micro-breaking switch, and the micro-breaking switch is matched with the switching device 204 to control the on and off of the branch.
In one embodiment, an ac/dc converter is also disposed within the decentralized energy router 200. The ac/dc converter is configured to convert the three-phase ac 101 or the single-phase ac 102 received by the power distribution input interface into the first dc, and output the first dc through the first dc output interface 202.
In one embodiment, the decentralized energy router 200 includes a decentralized control device 210. The sub-center control unit 210 is electrically connected to the plurality of switching devices 204 and the plurality of control units 310, respectively. The centering control device 210 is configured to control on/off of each of the switching devices 204. The decentralized control device 210 is also configured to coordinate the flow of electrical power between the individual consumer routers 300 via the switching devices 204.
In one embodiment, the specific structure of the sub-center control device 210 is not limited, and only has a function of controlling on and off of each of the switching devices 204 and coordinating the flow of electrical power between each of the consumer routers 300 through the switching devices 204. In one embodiment, the split-center control unit 210 may be an MCU (micro control unit). In one embodiment, the decentralized control device 210 may be a control chip.
In one embodiment, each of the switching devices 204 is in an on state when the power received by the power distribution input interface of the decentralized control device 210 (i.e., the three-phase alternating current 101 or the single-phase alternating current 102, the first direct current, and the second direct current) is sufficient. In one embodiment, the central control unit 210 may coordinate the flow of electrical energy between the subscriber level routers 300 through the switching device 204 according to the power consumption request of the control unit 310 in each subscriber level router 300, so as to ensure the normal operation of the load 301 electrically connected to the output terminal of each subscriber level router 300.
Referring to fig. 4, in one embodiment, the total energy router 100 includes a first grid input interface 110, a second grid input interface 120, a three-phase ac/dc conversion device 130, a single-phase ac/dc conversion device 140, and a dc/dc conversion device 150. The first grid input interface 110 is configured to obtain the three-phase ac power 101. The second grid input interface 120 is configured to obtain the single-phase ac power 102. The input terminal of the three-phase ac/dc conversion device 130 is electrically connected to the first grid input interface 110. The output terminals of the three-phase ac/dc conversion device 130 are electrically connected to a plurality of the decentralized energy routers 200. The three-phase ac/dc conversion device 130 is configured to convert the three-phase ac 101 into the first dc.
An input terminal of the single-phase ac/dc conversion device 140 is electrically connected to the second grid input interface 120. The output terminals of the single-phase ac/dc conversion device 140 are electrically connected to a plurality of the sub-center energy routers 200. The single-phase ac/dc conversion device 140 is configured to convert the single-phase ac 102 into the second dc. A first terminal of the dc/dc conversion device 150 is electrically connected to an output terminal of the three-phase ac/dc conversion device 130. A second terminal of the dc/dc conversion device 150 is electrically connected to an output terminal of the single-phase ac/dc conversion device 140. The dc/dc conversion device 150 is configured to convert the first dc power into the second dc power or convert the second dc power into the first dc power.
In one embodiment, the total energy router 100 further includes a photovoltaic power distribution interface 160, an energy storage power distribution interface 170, a first grid output interface 180, and a second grid output interface 190. The photovoltaic power distribution interface 160 is electrically connected to the output terminal of the three-phase ac/dc conversion device 130. The energy storage and distribution interface 170 is electrically connected to the output terminal of the single-phase ac/dc conversion device 140. The first grid output interface 180 is configured to output the three-phase ac power 101. The second grid output interface 190 is configured to output the single-phase ac power 102.
In one embodiment, the photovoltaic power distribution interface 160 may be used to electrically connect external photovoltaic power generation devices and provide power to the total energy router 100 through the photovoltaic power generation devices. Likewise, the energy storage power distribution interface 170 may be used to electrically connect external energy storage batteries and provide power to the total energy router 100 via the energy storage batteries. In the above manner, the stability and reliability of the power supply of the direct current multi-micro power grid system 10 can be ensured.
Referring to fig. 5, an embodiment of the present application provides a control method of a dc multi-micro grid system, which is applied to the dc multi-micro grid system 10 described in any of the above embodiments. The method comprises the following steps:
S102, controlling the photovoltaic power generation device 320 and/or the energy storage device 330 to supply power to the load 301 through the control device 310, and determining whether the power supply of the photovoltaic power generation device 320 and the energy storage device 330 meets the power consumption requirement of the load 301.
In one embodiment, the specific structures of the control device 310, the photovoltaic power generation device 320, and the energy storage device 330 may be the structures described in the above embodiments, and will not be repeated here. Determining, by the control device 310, whether the power supplied by the photovoltaic power generation device 320 and the energy storage device 330 meets the power demand of the load 301 means that the output voltage of the photovoltaic power generation device 320 and the load voltage of the load 301 may be obtained by the control device 310, and the output voltage of the photovoltaic power generation device 320 and the load voltage may be compared.
If the output voltage of the photovoltaic power generation device 320 is greater than or equal to the load voltage, it is determined that the output voltage of the photovoltaic power generation device 320 can meet the power consumption requirement of the load 301. If the output voltage of the photovoltaic power generation device 320 is smaller than the load voltage, it is determined that the output voltage of the photovoltaic power generation device 320 does not meet the power consumption requirement of the load 301 at this time, and step S104 is performed.
And S104, if the power supply of the photovoltaic power generation device 320 and the energy storage device 330 is determined to not meet the power consumption requirement of the load 301, controlling the three-phase alternating current 101 or the single-phase alternating current 102, the first direct current and the second direct current to bid for output so as to enable the load 301 to normally operate.
In one embodiment, the three-phase alternating current 101 or the single-phase alternating current 102, the first direct current, and the second direct current bid output may be controlled by the control device 310 to cause the load 301 to operate normally. Specifically, as shown in fig. 2, the control device 310 may control the three-phase ac 101 or the single-phase ac 102, the first dc and the second dc to bid for output by using each of the controllable switching devices (KM 1, KM2, KM4, KM5 and KM 8) so that the load 301 operates normally. In one embodiment, the control device 310 may also implement the three-phase alternating current 101 and/or the first direct current and/or the second direct current power supply via respective controllable switching devices.
For example, when the three-phase ac 101 is required to supply power, the control device 310 may control KM1, KM2, and KM9 to be turned on. When the first direct current is needed to supply power, the control device 310 can control the KM4, KM5 and KM9 to be conducted. When the second direct current is needed to supply power, KM8 can be controlled to be conducted through the control device 310. Meanwhile, the three power supply modes can be combined to supply power in any mode. That is, the load 301 may be powered by the three-phase alternating current 101 and/or the first direct current and/or the second direct current simultaneously.
In one embodiment, the control device 310 may also send the electricity demand to a sub-center controller in the sub-center energy router 200, and detect whether there is excess power in other of the customer routers 300 through the sub-center controller. If the redundant power of other household level routers 300 is detected, the redundant power of the other household level routers 300 can be switched to the current household level router 300 through the switch by coordination of the centering controllers so as to provide power support, thereby enabling the load 301 to operate normally. Namely, the function of coordinating the electric energy flow among the household level routers 300 through the sub-center energy router 200 is realized, so that the ordered sharing of energy among the direct-current micro-grids (namely, the household level routers 300) is realized, the problems of redundancy and uneconomical existence of the direct-current multi-micro-grid system 10 are avoided, and the power supply stability and reliability of the direct-current micro-grid are improved.
In one embodiment, step S102 includes controlling, by the control device 310, the photovoltaic power generation device 320 to supply power to the load 301, and determining whether the output voltage of the photovoltaic power generation device 320 meets the power demand of the load 301. If it is determined that the output voltage of the photovoltaic power generation device 320 does not meet the power demand of the load 301, the remaining power of the energy storage device 330 is obtained, and whether to control the energy storage device 330 to supply power to the load 301 is determined based on a power setting threshold. If the remaining power is greater than the power setting threshold, the energy storage device 330 is controlled to supply power to the load 301, and it is determined whether the power supplied by the photovoltaic power generation device 320 and the energy storage device 330 meets the power consumption requirement of the load 301.
In one embodiment, the control device 310 determines whether the output voltage of the photovoltaic power generation device 320 meets the electricity consumption requirement of the load 301, specifically, the control device 310 may obtain the output voltage of the photovoltaic power generation device 320 through the DC/DC on the power supply branch of the photovoltaic power generation device 320, and compare the output voltage with the load voltage of the load 301. If the output voltage of the photovoltaic power generation device 320 is greater than or equal to the load voltage, it is determined that the output voltage of the photovoltaic power generation device 320 can meet the power consumption requirement of the load 301 at this time, and otherwise, the requirement is not met.
In one embodiment, obtaining the remaining power of the energy storage device 330 and determining whether to control the energy storage device 330 to supply power to the load 301 based on a power setting threshold refers to the control device 310 obtaining the remaining power of the energy storage device 330 through DC/DC on a power supply branch of the energy storage device 330 and comparing the remaining power with the power setting threshold. If the remaining power is greater than the power setting threshold, the control device 310 determines to control the energy storage device 330 to discharge (i.e. to the load 301), otherwise, not to discharge.
In summary, the present application converts the three-phase ac 101 and/or the single-phase ac 102 into the first dc and the second dc by the total energy router 100, and outputs the three-phase ac, the single-phase ac, the first dc and the second dc to the plurality of sub-center energy routers 200. Each sub-center energy router 200 outputs three-phase alternating current or single-phase alternating current, first direct current and second direct current to each of the subscriber level routers through a plurality of groups of output interfaces, so that one sub-center energy router 200 can realize access of a plurality of subscriber level direct current micro-grids. Meanwhile, the control device 310 in each household level router 300 controls the photovoltaic power generation device 320, the energy storage device 330, the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid for output according to a preset rule so as to enable the load to normally operate, and the energy flow among the household level routers 300 is coordinated through the branch center energy router 200, so that the orderly sharing of energy among the direct current micro-grids is realized, and the power supply stability and reliability of the direct current micro-grids are improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (11)
1. A direct current multi-microgrid system, comprising:
The input end of the total energy router is used for acquiring three-phase alternating current and single-phase alternating current respectively, and the total energy router is used for converting the three-phase alternating current and/or the single-phase alternating current into first direct current and second direct current and outputting the three-phase alternating current, the single-phase alternating current, the first direct current and the second direct current;
A plurality of sub-center energy routers, each of which is electrically connected with the output end of the total energy router, the sub-center energy router being provided with a plurality of groups of output interfaces, each group of output interfaces being used for outputting the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current, and
The system comprises a plurality of household level routers, a plurality of control units and a plurality of control units, wherein each household level router is electrically connected with a group of output interfaces, the output ends of the household level routers are used for electrically connecting loads, and the household level routers are used for acquiring the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current;
The household level router comprises a control device, a photovoltaic power generation device and an energy storage device, wherein the control device is used for controlling the photovoltaic power generation device, the energy storage device, the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid and output so as to enable the load to normally operate;
The control device is configured to preferentially control the photovoltaic power generation device and/or the energy storage device to supply power to the load, and determine whether the power supply of the photovoltaic power generation device and the energy storage device meets the power consumption requirement of the load;
if the power supply of the photovoltaic power generation device and the energy storage device does not meet the power consumption requirement of the load, the control device controls the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid and output so that the load normally operates;
The control device is respectively and electrically connected with the photovoltaic power generation device, the energy storage device and the sub-center energy router, and is also used for acquiring the residual electric quantity of the energy storage device and determining whether to control the energy storage device to discharge or not based on an electric quantity set threshold value;
The decentralized energy routers are also used for coordinating the flow of electrical energy between the individual consumer routers.
2. The direct current multi-microgrid system according to claim 1, wherein said source of said first direct current received by said consumer level router is said first direct current directly output by said decentralized energy router or said first direct current output by other said consumer level router;
The source of the second direct current received by the household level router is the second direct current directly output by the sub-center energy router or the second direct current output by other household level routers.
3. The direct current multi-microgrid system according to claim 1, wherein said control device is configured to compare said remaining power with said power setting threshold, and if said remaining power is greater than said power setting threshold, said control device controls said energy storage device to discharge, and if said remaining power is less than or equal to said power setting threshold, said control device controls said energy storage device not to discharge.
4. The direct current multi-microgrid system according to claim 1, wherein the output interfaces comprise an alternating current output interface, a first direct current output interface and a second direct current output interface, and switching devices are arranged in the alternating current output interface, the first direct current output interface and the second direct current output interface, and each switching device is used for controlling the on and off of the alternating current output interface or the first direct current output interface or the second direct current output interface respectively.
5. The direct current multi-microgrid system according to claim 4, wherein said decentralized energy router comprises:
And the branch center control device is respectively and electrically connected with the plurality of switching devices and the plurality of control devices, and is used for controlling the on and off of each switching device and coordinating the electric energy flow among the household routers through the switching devices.
6. The direct current multi-microgrid system according to claim 1, wherein the total energy router comprises:
the first power grid input interface is used for acquiring the three-phase alternating current;
The second power grid input interface is used for acquiring the single-phase alternating current;
The input end of the three-phase alternating current/direct current conversion device is electrically connected with the first power grid input interface, and the output end of the three-phase alternating current/direct current conversion device is electrically connected with a plurality of the sub-center energy routers and is used for converting the three-phase alternating current into the first direct current;
A single-phase AC/DC conversion device with an input end electrically connected to the second power grid input interface, an output end electrically connected to the plurality of sub-center energy routers for converting the single-phase AC to the second DC, and
And the second end of the direct current/direct current conversion device is electrically connected with the output end of the single-phase alternating current/direct current conversion device and is used for converting the first direct current into the second direct current or converting the second direct current into the first direct current.
7. The direct current multi-microgrid system according to claim 6, wherein said total energy router further comprises:
The photovoltaic power distribution interface is electrically connected with the output end of the three-phase alternating current/direct current conversion device;
the energy storage and distribution interface is electrically connected with the output end of the single-phase alternating current/direct current conversion device;
a first power grid output interface for outputting the three-phase alternating current, and
And the second power grid output interface is used for outputting the single-phase alternating current.
8. The direct current multi-microgrid system according to any one of claims 1-7, wherein the voltages of said first direct current and said second direct current are different.
9. The direct current multi-microgrid system according to claim 8, wherein the output end of said consumer level router is further provided with metering equipment for collecting electricity information.
10. A control method of a direct current multi-micro grid system, characterized in that it is applied to a direct current multi-micro grid system according to any one of claims 1 to 9, the method comprising:
controlling the photovoltaic power generation device and/or the energy storage device to supply power to the load through the control device, and determining whether the power supply of the photovoltaic power generation device and the energy storage device meets the power consumption requirement of the load;
And if the power supply of the photovoltaic power generation device and the energy storage device does not meet the power consumption requirement of the load, controlling the three-phase alternating current or the single-phase alternating current, the first direct current and the second direct current to bid and output so as to enable the load to normally operate.
11. The control method of a direct current multi-microgrid system according to claim 10, wherein the step of controlling the photovoltaic power generation device and/or the energy storage device to supply power to the load by the control device and determining whether the power supply of the photovoltaic power generation device and the energy storage device is sufficient comprises:
controlling the photovoltaic power generation device to supply power to the load through the control device, and determining whether the output voltage of the photovoltaic power generation device meets the power consumption requirement of the load;
if the output voltage of the photovoltaic power generation device is determined to not meet the power consumption requirement of the load, acquiring the residual electric quantity of the energy storage device, and determining whether to control the energy storage device to supply power to the load or not based on an electric quantity set threshold;
And if the residual electric quantity is larger than the electric quantity set threshold value, controlling the energy storage device to supply power to the load, and determining whether the power supply of the photovoltaic power generation device and the energy storage device meets the power consumption requirement of the load.
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| CN111224402B (en) * | 2020-03-13 | 2024-12-31 | 珠海格力电器股份有限公司 | DC multi-microgrid system and control method |
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2020
- 2020-03-13 CN CN202010175097.5A patent/CN111224402B/en active Active
- 2020-11-26 WO PCT/CN2020/131689 patent/WO2021179685A1/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211480931U (en) * | 2020-03-13 | 2020-09-11 | 珠海格力电器股份有限公司 | Direct-current multi-microgrid system |
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| CN111224402A (en) | 2020-06-02 |
| WO2021179685A1 (en) | 2021-09-16 |
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