CN112910302B - A power router and a power router control method - Google Patents
A power router and a power router control method Download PDFInfo
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- CN112910302B CN112910302B CN202110244889.8A CN202110244889A CN112910302B CN 112910302 B CN112910302 B CN 112910302B CN 202110244889 A CN202110244889 A CN 202110244889A CN 112910302 B CN112910302 B CN 112910302B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
- H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
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Abstract
The invention discloses an electric energy router and an electric energy router control method, wherein each phase unit comprises three phase units, each phase unit comprises two bridge arm units connected in series, a high-voltage alternating current port of the corresponding phase unit is formed by connecting points of the two bridge arm units in series, each high-voltage alternating current port is respectively connected with an alternating current power supply of the corresponding phase, the three phase units are connected in parallel to form a high-voltage direct current port, each bridge arm unit is formed by connecting a bridge arm reactor, a power module unit and a plurality of mixed alternating current sub-modules in series, and each phase unit is connected with different numbers of mixed alternating current sub-modules to form alternating current ports of different voltage grades of the corresponding phase unit. The invention realizes the control of power transmission among the electric connection ports, the balance of bridge arm energy and the balance control of submodule capacitance, can integrally provide high-voltage, medium-voltage and low-voltage alternating-current and direct-current electric ports, and effectively improves the power density and the energy utilization efficiency of the equipment.
Description
Technical Field
The invention relates to the technical field of multiport alternating-direct current power conversion and energy transfer, in particular to an electric energy router and an electric energy router control method.
Background
The electric energy router has the technical advantages of active and reactive independent adjustment, flexible control and the like, can realize multi-voltage-class alternating current and direct current power transformation and multi-system energy interconnection, directly provides grid connection and power supply ports for renewable energy sources and alternating current and direct current loads, and is an important means for improving the acceptance of the renewable energy sources, enhancing the stability and flexibility of a power grid and supporting energy source transformation. The existing electric energy router needs to rectify electric energy, then perform direct current transformation and finally perform inversion, belongs to three-level transformation, and has low equipment operation efficiency due to the fact that the transformation stages of the electric energy are multiple, and directly causes the fact that the number of submodules and power devices required by the equipment is multiple, and therefore the equipment cost is high and the size is large.
Disclosure of Invention
Therefore, the invention provides the electric energy router and the control method thereof, thereby solving the problems that the existing electric energy router has a plurality of electric energy conversion stages and the operation efficiency of equipment cannot be ensured.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The embodiment of the invention provides an electric energy router, which comprises three phase units, wherein each phase unit comprises two bridge arm units connected in series, a high-voltage alternating current port of the corresponding phase unit is formed by connecting points of the two bridge arm units connected in series, each high-voltage alternating current port is respectively connected with an alternating current power supply of the corresponding phase, the three phase units are connected in parallel to form a high-voltage direct current port, each bridge arm unit is formed by connecting a bridge arm reactor, a power module unit and a plurality of mixed alternating current sub-modules in series, and each phase unit is connected with different numbers of mixed alternating current sub-modules to form alternating current ports of different voltage grades of the corresponding phase unit.
In one embodiment, the power module unit comprises a plurality of power sub-modules connected in series, and the power sub-modules comprise half-bridge type sub-modules or full-bridge type sub-modules.
In one embodiment, each bridge arm unit is further connected with a plurality of hybrid DC sub-modules in series, and different voltage class DC ports are formed by connecting different numbers of hybrid DC sub-modules.
In an embodiment, the electric energy router further includes a controller, where the controller is connected to each dc port, ac port, each of the power sub-modules, the hybrid dc sub-module, and the hybrid ac sub-module, and is configured to control an operating state of each sub-module, so as to implement conversion of output voltages of the dc ports with different voltage levels or the ac ports with different voltage levels.
In an embodiment, the dc output ends of the plurality of hybrid dc sub-modules are connected in any one of series, parallel, and serial-parallel connection, and the ac output ends of the plurality of hybrid ac sub-modules in the phase unit are connected in any one of series, parallel, and serial-parallel connection.
In an embodiment, the half-bridge type submodule comprises a direct-current capacitor, two IGBT devices, a resistor and a thyristor, wherein the two IGBT devices are connected in series to form an IGBT device series branch, the resistor and the direct-current capacitor are connected in parallel, the thyristor is connected with any one of the two IGBT devices in parallel, the anode of the thyristor is connected with the cathode of the direct-current capacitor, the cathode of the thyristor is connected with the collector of the IGBT device in parallel, the cathode of the thyristor leads out the positive output of the half-bridge type submodule, and the anode leads out the negative output of the half-bridge type submodule.
In an embodiment, the full-bridge type submodule comprises a direct-current capacitor, four IGBT devices and a resistor, wherein the four IGBT devices are connected in series in pairs to form two IGBT device series branches, the resistor and the direct-current capacitor are connected in parallel, and serial connection points in the two IGBT device series branches are respectively used as positive output and negative output of the full-bridge type submodule.
In an embodiment, the hybrid direct current sub-module comprises a first front-stage circuit and a rear-stage isolated DC/DC converter circuit, wherein the first front-stage circuit is any one of the half-bridge sub-module and the full-bridge sub-module, the first front-stage circuit comprises a direct current capacitor, the positive pole and the negative pole of the direct current capacitor of the first front-stage circuit are connected with the first end of the rear-stage isolated DC/DC converter, the rear-stage isolated DC/DC converter is any one of an isolated double-active bridge DAB converter and an isolated resonant converter, and the second end of the rear-stage isolated DC/DC converter is used as the direct current output end of the hybrid direct current sub-module.
In an embodiment, the hybrid ac sub-module comprises a second front-stage circuit and a rear-stage inverter conversion circuit, wherein the second front-stage circuit comprises a dc capacitor, the positive pole and the negative pole of the dc capacitor in the second front-stage circuit are connected with the dc end of the rear-stage inverter circuit, the second front-stage circuit is any one of a half-bridge sub-module or a full-bridge sub-module, the rear-stage inverter circuit is any one of a single-stage inverter circuit or a two-stage inverter circuit, the single-stage inverter circuit comprises a full-bridge inverter circuit and a single-phase isolation transformer, a first end winding of the single-phase isolation transformer is connected with the ac end of the full-bridge inverter circuit, a second end winding is used as the ac output end of the hybrid ac sub-module, and the two-stage inverter circuit comprises any one of an isolated double-active bridge DAB converter or an isolated resonant converter, and a full-bridge topology circuit, and the dc end of the full-bridge inverter circuit is connected with the ac end of the isolated double-active bridge converter or the full-bridge converter as the ac output end of the hybrid ac sub-module.
In a second aspect, an embodiment of the present invention provides a method for controlling an electric energy router, including obtaining target electric energy data, and controlling working states of each sub-module of the electric energy router according to the target electric energy data, so as to implement conversion of output voltages of a plurality of dc ports with different voltage classes or a plurality of ac ports with different voltage classes.
The technical scheme of the invention has the following advantages:
the electric energy router provided by the invention realizes the control of power transmission among all electric connection ports through the AC/DC ports with different voltage levels, the balance of bridge arm energy and the equalizing control of submodule capacitance, can integrally provide high-voltage, medium-voltage and low-voltage AC/DC electric ports, takes the bridge arm submodule capacitance as an energy storage link of energy exchange unification of all electric ports, greatly reduces the conversion level among all electric ports, effectively reduces the number of capacitors needed by a system, can obviously improve the power density and the energy utilization efficiency of equipment, and can effectively reduce the volume and the cost of the system. By adopting a modularized design, the operation reliability of the equipment can be ensured by improving the redundancy of the sub-modules, the bidirectional flow of energy among all the electric connection ports is realized, the fault current suppression function of each port is realized, and the device is suitable for high-voltage high-capacity, medium-low-voltage low-capacity application occasions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an electrical energy router according to an embodiment of the present invention;
fig. 2 is a bridge arm unit structure diagram of an electric energy router according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of a specific example of another bridge arm unit of the power router according to the embodiment of the present invention;
Fig. 4 is another specific topology structure of a bridge arm unit of the power router according to the embodiment of the present invention;
fig. 5 is a topology structure of a hybrid dc sub-module according to an embodiment of the present invention;
fig. 6 is another topology of a hybrid dc sub-module according to an embodiment of the present invention;
fig. 7 is a topology of a hybrid ac sub-module according to an embodiment of the present invention;
FIG. 8 is another topology of a hybrid AC sub-module provided by an embodiment of the present invention;
FIG. 9 is a specific topology of a power router according to an embodiment of the present invention;
FIG. 10 is another topology of a power router provided in an embodiment of the present invention;
fig. 11 is a schematic diagram of another specific topology of a power router according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, and in communication with each other between two elements, and wirelessly connected, or wired. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Examples
The embodiment of the invention provides an electric energy router which is applicable to various energy conversion application occasions and is applied to interconnection and energy transfer of multi-voltage-class alternating current and direct current systems, as shown in fig. 1, the electric energy router in the embodiment of the invention comprises three phase units which are respectively alternating current three-phase sequences (A-phase unit 01, B-phase unit 02 and C-phase unit 03), each phase unit comprises two bridge arm units which are connected in series, a high-voltage alternating current port of the corresponding phase unit is formed by connecting a connecting point of the two bridge arm units (an upper bridge arm unit 1 and a lower bridge arm unit 2) in series, each high-voltage alternating current port is respectively connected with an alternating current power supply (A, B, C) of the corresponding phase, three phase units are connected in parallel to form the high-voltage direct current port, each bridge arm unit is formed by connecting a bridge arm reactor 11, a power module unit 12 and a plurality of mixed alternating current sub-modules 13 in series, and each phase unit is connected with different numbers of mixed alternating current sub-modules 13 in series to form different voltage-class alternating current ports of the corresponding phase units.
Specifically, taking a bridge arm unit of an electric energy router as an example, as shown in fig. 2, in the embodiment of the present invention, the bridge arm unit structure of the electric energy router is formed by connecting a bridge arm reactor 11, N power module units 12 (conventional sub-modules) and K hybrid ac sub-modules 13 in series, wherein ac output ends of the K hybrid ac sub-modules 13 are led out, and ac output ends of the plurality of hybrid ac sub-modules 13 in the bridge arm unit are connected in series, in parallel or in series-parallel to form a phase low-voltage ac voltage port.
The constant current energy supply device electric energy router provided by the embodiment of the invention realizes the control of power transmission among all electric connection ports through the alternating current/direct current ports with different voltage levels, the balance of bridge arm energy and the equalizing control of submodule capacitance, can integrally provide high-voltage, medium-voltage and low-voltage alternating current/direct current electric ports, takes the bridge arm submodule capacitance as an energy exchange unified energy storage link of all electric ports, greatly reduces the conversion stage number among all electric ports, effectively reduces the number of capacitors needed by a system, can obviously improve the power density and energy utilization efficiency of equipment, and can effectively reduce the volume and cost of the system. By adopting a modularized design, the operation reliability of the equipment can be ensured by improving the redundancy of the sub-modules, the bidirectional flow of energy among all the electric connection ports is realized, the fault current suppression function of each port is realized, and the device is suitable for high-voltage high-capacity, medium-low-voltage low-capacity application occasions.
In a specific embodiment, the power module unit comprises a plurality of power sub-modules connected in series, wherein the power sub-modules comprise half-bridge type sub-modules or full-bridge type sub-modules, each bridge arm unit is further connected with a plurality of mixed direct current sub-modules in series, and different voltage class direct current ports are formed by connecting different numbers of mixed direct current sub-modules. In practical application, each bridge arm unit is formed by connecting a bridge arm reactor and a plurality of power module units in series, wherein each power module unit is formed by connecting a plurality of IGBT elements and corresponding auxiliary circuits in series or in parallel, and each sub-module is an electric energy router to realize an AC-DC conversion basic unit.
The series power module unit type in each bridge arm unit comprises a half-bridge sub-module, a full-bridge sub-module, a mixed direct current sub-module and a mixed alternating current sub-module, and each bridge arm unit can be formed by connecting one or more types of sub-modules in series. As shown in fig. 3, which is a schematic diagram of a bridge arm unit of an electric energy router in the embodiment of the present invention, the bridge arm unit is formed by connecting a bridge arm reactor 11 and N power module units 12 in series, wherein a power sub-module may use a classical full-bridge sub-module or a classical half-bridge sub-module or a mixture of both, and it should be noted that the bridge arm unit does not have a medium-low voltage ac/dc voltage output port.
The half-bridge type submodule comprises a direct-current capacitor, two IGBT devices, a resistor and a thyristor, wherein the two IGBT devices are connected in series to form an IGBT device series branch, the resistor and the direct-current capacitor are connected in parallel, the thyristor is connected with any one of the two IGBT devices in parallel, the anode of the thyristor is connected with the cathode of the direct-current capacitor, the cathode of the thyristor is connected with the collector of the IGBT device connected in parallel, the cathode of the thyristor leads out the positive electrode output of the half-bridge type submodule, and the anode leads out the negative electrode output of the half-bridge type submodule. The half-bridge sub-module (HBSM) topology shown in fig. 3 is composed of a direct-current capacitor 204, two IGBT devices T1 and T2, a matched thyristor, equalizing resistors 202 and 203, a bypass switch 206, a thyristor 207 and a central logic control unit 205, wherein the two IGBT devices are connected in series to form an IGBT device serial branch 22, the equalizing resistor and the direct-current capacitor 204 are connected in parallel, the thyristor 207 is connected in parallel with one IGBT device T2, the anode of the thyristor 207 is connected with the cathode of the direct-current capacitor 204, the cathode of the thyristor is connected with the collector of the parallel IGBT device T2, the cathode of the thyristor 207 leads out the positive output of the half-bridge sub-module, and the anode of the thyristor 207 leads out the negative output of the half-bridge sub-module.
The full-bridge type submodule comprises a direct-current capacitor, four IGBT devices and a resistor, wherein the four IGBT devices are connected in series in pairs to form two IGBT device series branches, the resistor and the direct-current capacitor are connected in parallel, and the series connection points in the two IGBT device series branches are respectively used as positive electrode output and negative electrode output of the full-bridge type submodule. The full-bridge sub-module (FBSM) topology shown in fig. 3 is composed of a direct current capacitor 211, four IGBT devices T3, T4, T5 and T6, matched thyristors, equalizing resistors 209, 210, a bypass switch 208 and a central logic control unit 212, wherein the four IGBT devices are connected in series to form two IGBT device serial branches 23 and 24, the equalizing resistors 209, 210 and the direct current capacitor 211 are connected in parallel, and serial connection points in the two IGBT device serial branches serve as positive output and negative output of the full-bridge sub-module respectively.
In this embodiment, another topology structure of a bridge arm unit of an electric energy router is provided, as shown in fig. 4, the bridge arm unit is formed by connecting a bridge arm reactor 11, N power module units 12, J hybrid dc sub-modules 14 and K hybrid ac sub-modules 13 in series, wherein the output ends of the hybrid sub-modules are led out, the dc output ends of the hybrid dc sub-modules 14 in the bridge arm unit are connected in series, in parallel or in series-parallel to form a medium-low voltage dc voltage port, and the ac output ends of the hybrid ac sub-modules 13 are connected in series, in parallel or in series-parallel to form a low voltage ac voltage port in one phase.
The mixed direct current sub-module comprises a first front-stage circuit and a rear-stage isolated DC/DC converter circuit, wherein the first front-stage circuit is any one of a half-bridge sub-module and a full-bridge sub-module, the first front-stage circuit comprises a direct current capacitor, the positive pole and the negative pole of the direct current capacitor of the first front-stage circuit are connected with the first end of the rear-stage isolated DC/DC converter, the rear-stage isolated DC/DC converter is any one of an isolated double-active bridge DAB converter and an isolated resonant converter, and the second end of the rear-stage isolated DC/DC converter is used as a direct current output end of the mixed direct current sub-module.
As shown in fig. 5, a topology schematic diagram of a hybrid DC sub-module is provided, where the hybrid DC sub-module includes a first pre-stage circuit 301 and a post-stage isolated DC/DC converter circuit 302, the first pre-stage circuit 301 uses a half-bridge sub-module circuit, the positive and negative poles of a DC capacitor in the first pre-stage circuit 301 are connected to one end of the post-stage isolated DC/DC converter circuit 302, the post-stage isolated DC/DC converter circuit 302 uses an isolated dual-active bridge DAB converter, and the other end of the post-stage isolated DC/DC converter circuit 302 is used as a DC output terminal of the hybrid DC sub-module. The first front-stage circuit 301 may be a half-bridge sub-module or a full-bridge sub-module circuit, and the rear-stage isolated DC/DC converter circuit 302 may be an isolated dual-active bridge DAB converter or an isolated resonant converter.
Specifically, the present embodiment also provides another topology schematic diagram of a hybrid dc sub-module, as shown in fig. 6, where the hybrid dc sub-module uses a front half-bridge sub-module circuit 401 and the rear stage uses an isolated resonant converter 402. It should be noted that, the topology structure of the hybrid dc sub-module may be set according to actual requirements, and an existing circuit structure may be selected, which is not limited in this embodiment.
The mixed alternating current sub-module comprises a second pre-stage circuit and an inversion conversion circuit, wherein the second pre-stage circuit is any one of a half-bridge sub-module or a full-bridge sub-module, the inversion conversion circuit comprises a full-bridge topological circuit and a single-phase isolation transformer, the second pre-stage circuit comprises a direct current capacitor, the positive pole and the negative pole of the direct current capacitor in the second pre-stage circuit are connected with the direct current end of the inversion conversion circuit, a first end winding of the single-phase isolation transformer is connected with the alternating current end of the full-bridge topological circuit, and the second end winding is used as the alternating current output end of the mixed alternating current sub-module.
The present embodiment provides a topology schematic diagram of a hybrid ac sub-module, as shown in fig. 7, where the hybrid ac sub-module includes a second front stage circuit 501 and a rear stage full-bridge conversion circuit 502, the second front stage circuit 501 adopts a half-bridge sub-module circuit, the positive pole and the negative pole of a dc capacitor in the second front stage circuit 501 are connected with the dc end of the rear stage full-bridge conversion circuit 502, the rear stage full-bridge conversion circuit 502 includes a full-bridge topology circuit and a single-phase isolation transformer, one end winding of the single-phase isolation transformer is connected with the ac end of the full-bridge topology, and the other end winding is used as the ac output end of the hybrid ac sub-module. The second pre-stage circuit 501 may be a half-bridge sub-module or a full-bridge sub-module circuit. It should be noted that, the embodiment is only described by taking one topology structure of the hybrid ac sub-module as an example, and other topology structures may be selected in practical application, which is not limited to this embodiment.
The embodiment provides another topological schematic diagram of a hybrid ac sub-module, as shown in fig. 8, where the hybrid ac sub-module includes a front stage circuit 701 and a rear stage inverter circuit 702, the front stage circuit 701 is any one of a half-bridge sub-module or a full-bridge sub-module, the positive pole and the negative pole of a dc capacitor in the front stage circuit 701 are connected with a dc end of the inverter circuit 702, and the inverter circuit 702 is any one of a single-stage inverter circuit or a two-stage inverter circuit. The single-stage inverter circuit comprises a full-bridge inverter circuit and a single-phase isolation transformer.
The two-stage inverter circuit comprises any one of an isolated double-active-bridge DAB converter or an isolated resonant converter and a full-bridge topological circuit, wherein the direct-current end of the full-bridge inverter circuit is connected with the output end of any one of the isolated double-active-bridge DAB converter or the isolated resonant converter, and the alternating-current end of the full-bridge inverter circuit is used as the alternating-current output end of the hybrid alternating-current sub-module.
The electric energy router provided by the embodiment of the invention further comprises a controller, wherein the controller is connected with each direct current port, each alternating current port, each power sub-module, each mixed direct current sub-module and each mixed alternating current sub-module and is used for controlling the working state of each sub-module (comprising each power sub-module, each mixed direct current sub-module and each mixed alternating current sub-module) so as to realize the conversion of the output voltage of the direct current ports with different voltage levels or the alternating current ports with different voltage levels, the controller is an existing controller, and the invention does not limit the selection of the controller per se.
The controller is set to collect the voltage and the current of each port of the electric energy router and the voltage of each direct current capacitor, and outputs the trigger signals of the internal power devices of all the sub-modules according to the collected data, so as to be used for alternating current power control, alternating current output voltage control, direct current power control, direct current output voltage control, energy balance control in the electric energy router and capacitance voltage balance control of the sub-modules. The inter-phase energy balance control is used for adjusting the direct current component output by the upper bridge arm and the lower bridge arm so as to adjust the direct current component of the internal circulation of the electric energy router, so as to achieve inter-phase energy balance, and the inter-phase energy balance control is used for adjusting the alternating current component of the internal circulation of the electric energy router by adjusting the high-frequency alternating current component output by the upper bridge arm and the lower bridge arm so as to achieve inter-bridge energy balance.
Specifically, an example of a specific topology structure is illustrated, as shown in fig. 9, the electric energy router topology adopts an MMC skeleton, the direct current side port of the MMC structure is the electric energy router high voltage direct current port U dcN (112, 113), the alternating current side port of the MMC structure is the electric energy router high voltage alternating current port (114, 115, 116), in this embodiment, the direct current output ends of the electric energy router bridge arm unit series hybrid direct current sub-modules are connected in series, parallel or series-parallel to form a plurality of medium-low voltage direct current voltage ports, as shown by the ports 117, 118,119, 120,121, 122,123, 124,125, 126 and 127, 128 in fig. 9, and the alternating current output ends of the electric energy router bridge arm unit series hybrid alternating current sub-modules are connected in series, parallel or series-parallel to form a low voltage alternating current voltage port in one phase, as shown by the ports 129, 130, 131, 132, 133, 134, 135, 136 in fig. 9.
It should be noted that, in the embodiment, only one MMC structure of the topology structure of the electric energy router is illustrated as an example, and in practical application, the topology structure of the electric energy router may be selected and set according to practical requirements, which is not limited to this embodiment.
In the embodiment, under the condition that the direct current output ends of the plurality of hybrid direct current sub-modules are connected in series and in series-parallel to form the middle and low voltage direct current ports of the multifunctional high-integration compact electric energy router, the number of the middle and low voltage direct current ports of the multifunctional high-integration compact electric energy router is multiple, the two ends of the middle and low voltage direct current ports are the first end and the second end of the first hybrid direct current sub-module direct current output port and the last hybrid direct current sub-module direct current output port of at least two hybrid direct current sub-modules which are connected in series in the plurality of hybrid direct current output ports, and under the condition that the direct current output ends of the plurality of hybrid direct current sub-modules are connected in parallel to form the low voltage direct current ports of the multifunctional high-integration compact electric energy router, the number of the low voltage direct current ports of the multifunctional high-integration compact electric energy router is 1.
As shown in fig. 10, another topology structure of an electric energy router is provided, in this embodiment, an upper bridge arm unit of the electric energy router is composed of a bridge arm reactor, N conventional sub-modules, and K hybrid dc sub-modules, a lower bridge arm unit is composed of a bridge arm reactor, N conventional sub-modules, and K hybrid ac sub-modules, in order to ensure that the capacitance voltage between the upper and lower bridge arm units is balanced, the total number of the sub-modules of the upper and lower bridge arm units is identical, and the phase unit is formed by connecting the upper and lower bridge arm units in series. Under the condition that the direct current output ends of the plurality of hybrid direct current sub-modules are connected in series and connected in series-parallel to form the low-voltage direct current ports in the multifunctional high-integration compact electric energy router, the number of the low-voltage direct current ports in the multifunctional high-integration compact electric energy router is a plurality of. As shown in fig. 10, the first end 601 and the second end 602 of the dc output port of the No. 1 hybrid dc sub-module HDCSM in the lower bridge arm unit a form a medium-low voltage dc port, and the dc output port of the No. 1 hybrid dc sub-module HDCSM and the dc output port of the No. 2 hybrid dc sub-module HDCSM in the lower bridge arm unit B are connected in series, and the first end 603 of the dc output port of the No. 1 hybrid dc sub-module HDCSM1 and the second end 604 of the dc output port of the No. 2 hybrid dc sub-module HDCSMK also form a medium-low voltage dc port. The dc output ports of the No. 1 and No. 2-K mixed dc sub-modules HDCSM in the lower bridge arm unit are connected in series, and the first end 605 of the dc output port of the No. 1 mixed dc sub-module HDCSM and the second end 606 of the dc output port of the K mixed dc sub-module HDCSMK also form a medium-low voltage dc port. In the embodiment of the invention, the voltage level of the medium-low voltage direct current port is determined by IGBT parameters of the power device, the connection mode of the submodule and the port leading-out mode.
The mode that the alternating current output ends of a plurality of mixed alternating current sub-modules are connected in series, in parallel and in series-parallel connection to form a low-voltage alternating current port in the multifunctional high-integration compact electric energy router is also many. As shown in fig. 10, the ac output ports of the No. 1, no. 2 to No. K hybrid ac sub-modules HACSM of each phase of the upper bridge arm unit of the electrical energy router are connected in series, the first ends 607, 608, 609 of the ac output ports of the No. 1 hybrid ac sub-module HACSM of each upper bridge arm unit are led out and respectively serve as three-phase ac output ports, the second ends of the ac output ports of the No. K hybrid ac sub-module HACSMK of each upper bridge arm unit are connected to form a neutral point 610, and medium-low voltage ac ports are formed in a star connection manner. In the embodiment of the invention, the voltage level of the medium-low voltage alternating current port is determined by IGBT parameters of the power device, the connection mode of the submodule and the port leading-out mode.
As shown in fig. 11, another topology structure of the power router is provided, where the number of low-voltage dc ports in the multi-functional high-integration compact power router is 1 in the case where the dc output terminals of the plurality of hybrid dc sub-modules are connected in parallel to form the low-voltage dc ports in the multi-functional high-integration compact power router. As shown in fig. 11, in this embodiment, all the mixed dc sub-modules of the lower bridge arm unit of the electric energy router are connected in parallel, the first ends of the mixed dc sub-modules are connected to form 611, the second ends of the mixed dc sub-modules are connected to form 612, and the terminals 611 and 612 form a medium-low voltage dc output port.
As shown in fig. 11, the ac output ports of the No. 1 and No. 2-K hybrid ac sub-modules HACSM of each phase of the upper bridge arm unit of the electric energy router are connected in series, the first end 613 of the ac output port of the No. 1 hybrid ac sub-module HACSM of the a-phase upper bridge arm unit is connected to the second end 618 of the ac output port of the No. K hybrid ac sub-module HACSMK of the C-phase upper bridge arm unit, the first end 615 of the ac output port of the No. 1 hybrid ac sub-module HACSM of the B-phase upper bridge arm unit is connected to the second end 614 of the ac output port of the K hybrid ac sub-module HACSMK of the a-phase upper bridge arm unit, the first end 617 of the ac output port of the No. 1 hybrid ac sub-module HACSM of the C-phase upper bridge arm unit is connected to the second end 616 of the ac output port of the K hybrid ac sub-module HACSMK of the B-phase upper bridge arm unit, and the first ends 613, 615, 617 of the ac output ports of the No. 1 hybrid ac sub-phase units HACSM of each phase upper bridge arm unit are led out as three-phase ac output ports, and form a medium-low voltage ac port in an angular connection.
It should be noted that, the method for leading out the medium-low voltage ac/dc port of the electric energy router provided by the invention is various, including but not limited to the method mentioned in the embodiment of the invention, and the method for leading out the medium-low voltage ac/dc port of the hybrid submodule output end in any form of serial connection, parallel connection or serial-parallel connection belongs to the protection scope of the patent.
The embodiment of the invention also provides a control method of the electric energy router, which comprises the following steps of obtaining target electric energy data, wherein the target electric energy data can comprise data such as power, voltage and the like, then collecting voltage and current of each port of the electric energy router and voltage of each direct current capacitor, outputting trigger signals of internal power devices of all sub-modules according to the target electric energy data and the collected data, and controlling working states of all the sub-modules of the electric energy router so as to realize conversion of output voltages of a plurality of direct current ports with different voltage classes or a plurality of alternating current ports with different voltage classes.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (6)
1. An electric energy router is characterized by comprising three phase units;
Each phase unit comprises two bridge arm units connected in series, and the connection points of the two bridge arm units connected in series form high-voltage alternating current ports of the corresponding phase units;
Each high-voltage alternating current port is connected with an alternating current power supply of a corresponding phase respectively;
the three phase units are connected in parallel to form a high-voltage direct-current port;
each bridge arm unit is formed by connecting a bridge arm reactor, a power module unit and a plurality of mixed alternating current sub-modules in series;
The mixed alternating current sub-modules with different numbers are connected into each phase unit to form alternating current ports with different voltage levels of the corresponding phase unit;
The power module unit comprises a plurality of power sub-modules connected in series;
the power submodule comprises a half-bridge submodule or a full-bridge submodule;
Each bridge arm unit is also connected with a plurality of mixed direct current sub-modules in series;
the mixed direct current sub-modules with different numbers are connected to form direct current ports with different voltage levels;
The power router also includes a controller,
The controller is connected with each direct current port, each alternating current port, each power sub-module, each mixed direct current sub-module and each mixed alternating current sub-module and is used for controlling the working state of each sub-module so as to realize the conversion of the output voltage of the direct current ports with different voltage levels or the alternating current ports with different voltage levels;
the direct current output ends of the mixed direct current sub-modules are connected in any one of series connection, parallel connection and series-parallel connection;
The alternating current output ends of the plurality of mixed alternating current sub-modules in the phase unit are connected in any one of series connection, parallel connection and series-parallel connection.
2. The power router of claim 1 wherein the half-bridge submodule includes a dc capacitor, two IGBT devices, a resistor, and a thyristor, wherein,
The two IGBT devices are connected in series to form an IGBT device series branch;
the IGBT device series branch, the resistor and the direct current capacitor are connected in parallel;
The thyristor is connected with any one of the two IGBT devices in parallel, the anode of the thyristor is connected with the cathode of the direct current capacitor, the cathode of the thyristor is connected with the collector of the IGBT device in parallel, the cathode of the thyristor leads out the positive output of the half-bridge type submodule, and the anode leads out the negative output of the half-bridge type submodule.
3. The power router of claim 1 wherein the full bridge sub-module comprises a dc capacitor, four IGBT devices, a resistor, wherein,
The four IGBT devices are connected in series in pairs to form two IGBT device series branches;
The two IGBT device series branches, the resistor and the direct current capacitor are connected in parallel, and the series connection points in the two IGBT device series branches are respectively used as positive pole output and negative pole output of the full-bridge type submodule.
4. The power router of claim 1, wherein the hybrid DC sub-module comprises a first pre-stage circuit and a post-stage isolated DC/DC converter circuit, wherein,
The first front-stage circuit is any one of the half-bridge type submodule or the full-bridge type submodule, the first front-stage circuit comprises a direct current capacitor, and the positive pole and the negative pole of the direct current capacitor of the first front-stage circuit are connected with the first end of the rear-stage isolation type DC/DC converter;
the rear-stage isolated DC/DC converter is any one of an isolated double-active bridge DAB converter or an isolated resonant converter, and the second end of the rear-stage isolated DC/DC converter is used as the direct current output end of the hybrid direct current sub-module.
5. The power router of claim 1, wherein the hybrid ac sub-module comprises a second pre-stage circuit and a post-stage inverter circuit, wherein,
The second front-stage circuit comprises a direct current capacitor, and the positive electrode and the negative electrode of the direct current capacitor in the second front-stage circuit are connected with the direct current end of the rear-stage inverter circuit;
The second front-stage circuit is any one of a half-bridge type submodule or a full-bridge type submodule, and the rear-stage inverter circuit is any one of a single-stage inverter circuit or a two-stage inverter circuit;
The single-stage inverter circuit comprises a full-bridge inverter circuit and a single-phase isolation transformer, wherein a first end winding of the single-phase isolation transformer is connected with an alternating-current end of the full-bridge inverter circuit, and a second end winding is used as an alternating-current output end of the mixed alternating-current sub-module;
The two-stage inverter circuit comprises any one of an isolated double-active-bridge DAB converter or an isolated resonant converter and a full-bridge topology circuit, wherein the direct-current end of the full-bridge topology circuit is connected with the output end of any one of the isolated double-active-bridge DAB converter or the isolated resonant converter, and the alternating-current end of the full-bridge topology circuit is used as the alternating-current output end of the hybrid alternating-current sub-module.
6. A method for controlling an electrical energy router, comprising:
acquiring target electric energy data;
The operating states of the sub-modules of the power router according to any one of claims 1-5 are controlled according to the target power data to achieve conversion of output voltages of a plurality of different voltage class dc ports or a plurality of different voltage class ac ports.
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| CN115085524A (en) * | 2022-07-15 | 2022-09-20 | 北京四方继保自动化股份有限公司 | Multi-scenario fault tolerance method and device for DC converter based on integrated current-limiting topology |
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