CN117117818B - DC power supply system and integrated power supply equipment - Google Patents
DC power supply system and integrated power supply equipmentInfo
- Publication number
- CN117117818B CN117117818B CN202311116906.5A CN202311116906A CN117117818B CN 117117818 B CN117117818 B CN 117117818B CN 202311116906 A CN202311116906 A CN 202311116906A CN 117117818 B CN117117818 B CN 117117818B
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- Prior art keywords
- battery
- power supply
- voltage
- module
- supply system
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Classifications
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
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- H02J7/82—
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- H02J7/865—
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- H02J7/933—
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本申请提供一种直流供电系统及一体化电源设备。该直流供电系统用于将电网的交流电转换为直流电，并向直流母线供电，直流供电系统包括整流模块和电池模块；整流模块的输出端和电池模块的输出端均与直流母线连接；其中，在电池模块的电压处于预设电压范围内，整流模块的输出电压跟随电池模块的电压输出，且整流模块的输出电压大于电池模块的电压；在电池模块的电压低于预设电压范围时，整流模块的输出电压为预设电压，预设电压处于预设电压范围。本申请能够提高供直流供电系统的供电稳定性。
This application provides a DC power supply system and an integrated power supply device. The DC power supply system converts AC power from the power grid into DC power and supplies power to a DC bus. The DC power supply system includes a rectifier module and a battery module; the output terminals of both the rectifier module and the battery module are connected to the DC bus. When the battery module voltage is within a preset voltage range, the output voltage of the rectifier module follows the battery module voltage, and the output voltage of the rectifier module is greater than the battery module voltage. When the battery module voltage is lower than the preset voltage range, the output voltage of the rectifier module is the preset voltage, which is within the preset voltage range. This application can improve the power supply stability of the DC power supply system.
Description
Technical Field
The application relates to the technical field of power grid power supply, in particular to a direct current power supply system and integrated power supply equipment.
Background
The power grid can supply power to each load on the direct current bus through the direct current power supply system, and the stability of the direct current power supply system directly determines whether the load on the direct current bus can stably operate. The higher the stability of the dc power supply system, the higher the reliability of the stable operation of the load on the dc bus. Therefore, stability of the dc power supply system is particularly important.
The direct current power supply system generally adopts a lithium battery as a standby power supply, in the practical application process, the voltage of the lithium battery at the end stage of charging suddenly rises, the lithium battery can supply power to a direct current bus due to the fact that the voltage is higher than the output voltage of the direct current system, so that the lithium battery is charged and discharged frequently, the service life of the lithium battery is further influenced, and when the output of the direct current system is abnormal, the lithium battery cannot play a role in backup guarantee, and the power supply reliability of the direct current power supply system is reduced.
Disclosure of Invention
The embodiment of the application provides a direct current power supply system and integrated power supply equipment, which are used for avoiding frequent charge and discharge of a lithium battery, influencing the electric quantity of the lithium battery and reducing the power supply reliability of the direct current power supply system.
In a first aspect, an embodiment of the present application provides a dc power supply system, configured to convert ac power of a power grid into dc power and supply the dc power to a dc bus, where the dc power supply system includes a rectifying module and a battery module;
The output end of the rectifying module and the output end of the battery module are connected with the direct current bus, the rectifying module is used for being connected between the power grid and the direct current bus, and the battery module is used for being connected between the power grid and the direct current bus;
When the voltage of the battery module is lower than the preset voltage range, the output voltage of the rectification module is the preset voltage, and the preset voltage is in the preset voltage range.
In one possible implementation, the rectifying module includes a rectifying unit and a first controller, and the first controller is connected to the rectifying unit and the battery module, respectively;
The rectification unit is used for rectifying and transforming to convert the alternating voltage of the power grid into direct voltage and supplying power to the direct current bus;
The first controller is used for collecting the voltage of the battery module and controlling the output voltage output by the rectifying unit to follow the voltage of the battery module within a preset voltage range for output.
In one possible implementation, a battery module includes a charging unit, a battery, and a second controller;
the charging unit is respectively connected with the power grid and the battery, and the battery is connected with the direct current bus;
And the second controller is respectively connected with the charging unit and the battery, and is used for controlling the charging unit to charge the battery when the residual capacity of the battery is lower than the preset capacity and controlling the battery to enter a dormant state when the residual capacity of the battery is greater than or equal to the preset capacity.
In one possible implementation, the battery module further includes a first switch connected between the charging unit and the battery;
the first switch is controlled by the second controller, and the second controller is specifically used for controlling the first switch to be closed when the residual capacity of the battery is lower than the preset capacity, and controlling the first switch to be opened when the residual capacity of the battery is greater than or equal to the preset capacity.
In one possible implementation, the dc power supply system further includes a discharge load and a second switch;
And the first end of the second switch is connected with the output end of the battery, and the second end of the second switch is connected with the discharging load.
In one possible implementation, the dc power supply system further includes a first anti-reverse module;
The first reverse connection preventing module is connected between the second switch and the output end of the battery and used for preventing reverse filling of discharge load voltage.
In one possible implementation, the dc power supply system further includes a second anti-reverse module;
the second reverse connection preventing module is connected between the battery module and the direct current bus and used for preventing reverse filling of the direct current bus voltage.
In one possible implementation, the dc power supply system further includes a third switch connected between the battery module and the dc bus, the third switch being normally closed.
In one possible implementation manner, the direct current power supply system further comprises a third reverse connection prevention module and a fourth switch;
the third reverse connection prevention module is connected between the fourth switch and the direct current bus and used for preventing reverse filling of the direct current bus voltage, the fourth switch is also connected with the rectification module, and the fourth switch is in a normally closed state.
In a second aspect, an embodiment of the present application provides a power supply apparatus including the dc power supply system according to any one of the first aspect above.
The embodiment of the application provides a direct current power supply system and integrated power supply equipment, which can ensure that a rectifying module in the direct current power supply system always outputs preferentially to supply power for a load bus in the normal power supply process of the direct current power supply system and the battery module supplies power for the load bus only when the direct current power supply system is abnormal, thereby avoiding frequent charge and discharge of the battery module, influencing the service life of a battery and improving the stability and reliability of the direct current power supply system. In addition, the output of the rectifying module is more stable than that of the battery module, and the rectifying module is powered preferentially, so that the stability and reliability of the direct current power supply system can be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural diagram of a dc power supply system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a second structure of a dc power supply system according to an embodiment of the present application;
fig. 3 is a schematic diagram of a third structure of a dc power supply system according to an embodiment of the present application;
fig. 4 is a schematic diagram of a fourth configuration of a dc power supply system according to an embodiment of the present application;
Fig. 5 is a schematic diagram of a fifth structure of a dc power supply system according to an embodiment of the present application;
fig. 6 is a schematic diagram of a sixth structure of a dc power supply system according to an embodiment of the present application;
fig. 7 is a schematic diagram of a seventh structure of a dc power supply system according to an embodiment of the present application;
fig. 8 is a schematic diagram of an eighth configuration of a dc power supply system according to an embodiment of the present application;
fig. 9 is a schematic diagram of a ninth configuration of a dc power supply system according to an embodiment of the present application;
fig. 10 is a schematic diagram of a tenth structure of a dc power supply system according to an embodiment of the present application.
Detailed Description
In order to make the present solution better understood by those skilled in the art, the technical solution in the present solution embodiment will be clearly described below with reference to the accompanying drawings in the present solution embodiment, and it is obvious that the described embodiment is an embodiment of a part of the present solution, but not all embodiments. All other embodiments, based on the embodiments in this solution, which a person of ordinary skill in the art would obtain without inventive faculty, shall fall within the scope of protection of this solution.
The term "comprising" in the description of the present solution and the claims and in the above-mentioned figures, as well as any other variants, means "including but not limited to", intended to cover a non-exclusive inclusion, and not limited to only the examples listed herein. Furthermore, the terms "first" and "second," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
The implementation of the application is described in detail below with reference to the specific drawings:
Fig. 1 is a schematic structural diagram of a dc power supply system according to an embodiment of the present application, as shown in fig. 1, a dc power supply system 10 is configured to convert ac power of a power grid 20 into dc power and supply the dc power to a dc BUS, where the dc power supply system 10 includes a rectifying module 11 and a battery module 12.
The output end of the rectifying module 11 and the output end of the battery module 12 are both connected with the direct current BUS bar BUS, the rectifying module 11 is used for being connected between the power grid 20 and the direct current BUS bar, and the battery module 12 is used for being connected between the power grid 20 and the direct current BUS bar.
When the voltage of the battery module 12 is within the preset voltage range, the output voltage of the rectifying module 11 follows the voltage output of the battery module 12, and the output voltage of the rectifying module 11 is greater than the voltage of the battery module 12, and when the voltage of the battery module 12 is lower than the preset voltage range, the output voltage of the rectifying module 11 is the preset voltage, and the preset voltage is within the preset voltage range.
As shown in fig. 1, the dc power supply system 10 may have two power supply lines:
the power supply line 1 comprises a power grid 20, a rectifying module 11 and a direct current BUS BUS.
And a power supply line 2, namely a battery module 12 and a direct current BUS BUS.
In an embodiment of the present application, the power grid 20 is connected to the battery module 12, and the power grid 20 may charge the battery module 12, wherein the battery module may include a lithium battery.
In order to ensure the priority of the power grid 20 supplying power to the direct current BUS through the rectifying module 11, the rectifying module 11 may output following the voltage of the battery module 12 within a preset voltage range, and the output voltage of the rectifying module 11 is greater than the voltage of the battery module 12.
Specifically, the rectifying module 11 is connected with the battery module 12, the rectifying module 12 can detect the voltage of the battery module 12 and follow the voltage output of the battery module 12 within a preset voltage range, and the output voltage of the rectifying module 12 is ensured to be higher than the voltage of the battery module 12, so that the rectifying module 11 can supply power to the direct current BUS preferentially. The preset voltage range may be a normal voltage range of the dc bus, for example, the preset voltage range may be 220v±10%, i.e., 198v to 242V.
When the rectifying module 12 detects that the voltage of the battery module 12 is lower than the preset voltage range, in order to avoid the power shortage of the dc BUS caused by the voltage output of the battery module 12 being continuously followed, the output voltage of the rectifying module 12 needs to be fixed to be the preset voltage, and the preset voltage is a voltage within the preset voltage range, which can be specifically set according to practical situations.
Alternatively, when the voltage of the battery module 12 is within the preset voltage range, the rectifying module 12 may control the output voltage to be always greater than the preset voltage value of the battery module 12, for example, the preset value may be 2V, 3V or 5V, which may be specifically set according to the actual situation.
The preset voltage range is, for example, 198v-242V, and the preset value is 2V.
The rectifying module 11 detects the voltage of the battery module 12 in real time. During the charging process of the battery module 12, the voltage of the battery module 12 gradually increases, and when the voltage of the battery module 12 is detected to be lower than 198V, the output voltage of the rectifying module 11 can be controlled to be 220V, and at this time, the power grid 20 provides the power supply voltage of 381V to the dc BUS through the rectifying module 11.
As the charging time increases, the voltage of the battery module 12 increases gradually. When the voltage of the battery module 12 rises to be within the preset voltage range, the rectifying module 12 controls the output voltage to follow the voltage of the battery module 12 for output, and is always 2V higher than the voltage of the battery. For example, if the voltage of the battery module 12 is 200V, the output voltage of the rectifying module 11 is controlled to 202V. Or the voltage of the battery module 12 is 210V, the output voltage of the rectifying module 11 is controlled to 212V. The voltage of the rectifying module 11 is always higher than the voltage of the battery module 12, so that the power grid 20 can supply power to the direct current BUS preferentially through the rectifying module 11, and the battery module 12 is in a charging state without discharging.
Generally, the highest voltage of the battery module 12 is not higher than the preset voltage range. However, in order to improve the operational reliability of the dc power supply system, the following strategy is set:
When the voltage of the battery module 12 is higher than the preset voltage range and the duration does not exceed the preset duration, the output voltage of the rectifying module 11 continues to follow the voltage output of the battery module 12, and the output voltage of the rectifying module 11 is kept larger than the voltage of the battery module 12.
When the voltage of the battery module 12 is higher than the preset voltage range and the duration exceeds the preset duration, the output voltage of the rectifying module 11 does not follow the voltage output of the battery module 12, and an alarm signal is output and the battery module 12 is controlled to stop outputting, wherein the alarm signal is used for indicating that the voltage of the battery module 12 is abnormal.
By detecting the voltage of the battery module 12 and setting the corresponding output voltage following strategy and alarm strategy of the rectifying module 11, the power grid 20 can be ensured to supply power to the direct current BUS preferentially through the rectifying module 11, frequent triggering of waking up the battery module 12 is avoided, the electric quantity of the battery module 12 is ensured, and the power supply reliability of the direct current power supply system is improved.
According to the embodiment of the application, by setting two paths of power supply, the running stability of the direct current bus load is ensured, and meanwhile, the power supply of the rectifying module is prioritized, so that the electric quantity of the battery module can be ensured, the electric quantity of the battery is prevented from being consumed, and the power supply reliability is further improved.
Fig. 2 is a schematic diagram of a second structure of a dc power supply system according to an embodiment of the present application, as shown in fig. 2, in some embodiments of the present application, a rectifying module 11 includes a rectifying unit 111 and a first controller 112, where the first controller 112 is connected to the rectifying unit 111 and a battery module 12, respectively.
The rectifying unit 111 is connected between the grid 20 and the dc BUS. The rectifying unit 111 is used for rectifying and transforming to convert the ac voltage of the power grid 20 into a dc voltage and to supply power to the dc BUS.
The first controller 112 is configured to collect a voltage of the battery module 12, and control the output voltage outputted by the rectifying unit 111 to follow the voltage of the battery module 12 within a preset voltage range for outputting. The output voltage of the rectifying unit 111 is the output voltage of the rectifying module 12, that is, the output voltage of the rectifying unit 111 is greater than the voltage of the battery module 12 within a preset voltage range.
The first controller 112 is further configured to control the output voltage of the rectifying unit 111 to be a preset voltage when the voltage of the battery module 12 is lower than a preset voltage range, where the preset voltage is in the preset voltage range.
The first controller 112 is provided with a voltage acquisition circuit for acquiring the voltage of the battery module 12. The rectifying unit 111 may be a rectifying circuit that is entirely composed of switching transistors, and the first controller 112 implements control of the output voltage of the rectifying unit 111 by adjusting the duty ratio of each switching transistor.
Further, when the voltage of the battery module 12 is higher than the preset voltage range and the duration does not exceed the preset duration, the first controller 112 controls the output voltage of the rectifying unit 112 to continue to follow the voltage output of the battery module 12 and keeps the output voltage of the rectifying unit 111 larger than the voltage of the battery module 12.
When the voltage of the battery module 12 is higher than the preset voltage range and the duration exceeds the preset duration, the first controller 112 controls the output voltage of the rectifying unit 112 not to follow the voltage output of the battery module 12 and outputs an alarm signal, and controls the battery module 12 to stop outputting, wherein the alarm signal is used for indicating that the voltage of the battery module 12 is abnormal.
Optionally, a communication circuit is provided in the first controller 112, and may communicate with the outside, and may send alarm information to the outside, for example, may send alarm information to the detection platform. Or the direct current power supply system 10 may further include an indicator light module, and the first controller 112 may output an alarm signal to the indicator light module to light a corresponding indicator light, so that a worker can learn the fault cause and the fault location in time.
In an embodiment of the present application, the first controller 112 may be a monitoring card.
According to the embodiment of the application, the first controller 112 is arranged to realize voltage detection of the battery module 12 and output voltage control of the rectifying unit 111, so that the priority of power supply of the power grid 20 to the direct current BUS through the rectifying unit 111 can be ensured, and frequent awakening of the battery module 12 is avoided. And, realize the real-time supervision to battery module 12 through first controller 112, voltage follow can be more accurate and reliable, guarantees the output reliability of rectifying element 111, promotes DC power supply system's operational reliability.
Fig. 3 is a schematic diagram of a third structure of the dc power supply system according to the embodiment of the present application, and as shown in fig. 3, in some embodiments of the present application, the battery module 12 includes a charging unit 121, a battery 122, and a second controller 123.
The charging unit 121 is connected to the power grid 20 and the battery 122, respectively, and the battery 122 is connected to the dc BUS.
The second controller 123 is connected to the charging unit 121 and the battery 122, and is configured to control the charging unit 121 to charge the battery 122 when the remaining capacity of the battery 122 is lower than a preset capacity, and to control the battery 122 to enter a sleep state when the remaining capacity of the battery 122 is greater than or equal to the preset capacity.
In an embodiment of the present application, the charging unit 121 may be an AC/DC conversion unit for converting the AC power of the power grid 20 into DC power to charge the battery 122.
The second controller 123 may be a battery management chip for detecting the remaining capacity of the battery 122 to control the operation state of the charging unit 121, and determining whether to charge the battery 122.
In an embodiment of the present application, the dc power supply system 10 may further include a charging circuit, specifically, the power grid 20, the charging unit 121, and the battery 122.
The charging process of the battery module 12 may be as follows:
The second controller 123 detects the remaining capacity of the battery 122 in real time, and controls the charging unit 121 to start operation to charge the battery 122 through the charging unit 121 when detecting that the remaining capacity of the battery 122 is lower than a preset capacity.
As the charging time increases, the second controller 123 controls the charging unit 121 to stop operating and controls the battery 122 to enter a sleep state when detecting that the remaining capacity of the battery 122 reaches a preset capacity.
During the charging process, the rectifying module 11 detects the voltage of the battery 122 in real time, and when the voltage of the battery 122 is lower than the preset voltage range, the output voltage of the rectifying module 11 is the preset voltage. When the voltage of the battery 122 is in the preset point voltage range, the output voltage of the rectifying module 11 follows the voltage of the battery 122, and the output voltage of the rectifying module 11 is always larger than the voltage of the battery 122, so that the power supply priority of the rectifying module 11 is ensured, the battery 122 is prevented from being charged to be a direct current bus for power supply, and the power supply reliability of a direct current power supply system is ensured.
According to the embodiment of the application, the second controller is used for realizing the charging and dormancy of the battery, so that the electric quantity of the battery is ensured, and the power supply reliability of the direct current power supply system is improved.
Fig. 4 is a schematic diagram of a fourth configuration of a dc power supply system according to an embodiment of the present application, and as shown in fig. 4, in some embodiments of the present application, the battery module 12 further includes a first switch S1 connected between the charging unit 121 and the battery 122.
The first switch S1 is controlled by the second controller 123, and the second controller 123 is specifically configured to control the first switch S1 to be turned on when the remaining capacity of the battery 122 is lower than a preset capacity, and control the first switch S1 to be turned off when the remaining capacity of the battery 122 is greater than or equal to the preset capacity. The first switch S1 may be a relay, a contactor, or an idle switch.
Specifically, the second controller 123 controls the first switch S1 to be closed and controls the charging unit 121 to start to operate when detecting that the remaining capacity of the battery 122 is lower than the preset capacity, so that the power grid 20 charges the battery 122 through the charging unit 121.
After detecting that the remaining capacity of the battery 122 reaches the preset capacity, the second controller 123 controls the first switch S1 to be turned off, and controls the charging unit 121 to stop operating, so as to control the battery 122 to enter a sleep state, and ensure the electric quantity of the battery.
In the embodiment of the application, the second controller 123 controls the first switch S1 to be turned on or turned off, so that the connection or disconnection between the battery 122 and the power grid can be realized. In some cases, such as during a battery failure or battery overhaul, separate isolation of the battery 122 may be achieved by opening the first switch S1, enabling separate maintenance of the battery 122.
Fig. 5 is a schematic diagram of a fifth structure of a dc power supply system according to an embodiment of the present application, as shown in fig. 5, in some embodiments of the present application, the dc power supply system 10 further includes a discharge load 13 and a second switch S2.
And a second switch S2 having a first terminal connected to the output terminal of the battery 122 and a second terminal connected to the discharge load 13. The second switch S2 may be controlled by the second controller 123, and the second switch S2 may be a relay, a contactor, or an idle switch.
The second controller 123 may also control the second switch to be turned on when receiving an external discharge test command, so as to control the battery 122 to perform a discharge test for the discharge load 13 through the second switch S2, so as to verify whether the battery 122 works normally.
Alternatively, the discharge load 13 may be a load resistor or a discharge cart.
In the embodiment of the present application, on the premise of ensuring that the rectifying module 11 preferentially supplies power to the dc BUS, in order to test whether the battery 122 can work normally, the second switch S2 may be controlled to be closed to perform a discharging test, so as to verify whether the battery 122 works normally, so as to facilitate maintaining the battery activity and not to affect the power supply reliability of the dc BUS.
Fig. 6 is a schematic diagram of a sixth structure of a dc power supply system according to an embodiment of the present application, as shown in fig. 6, in some embodiments of the present application, the dc power supply system 10 further includes a first anti-reverse connection module 14.
The first anti-reverse connection module 14 is connected between the second switch S2 and the output terminal of the battery 122 for preventing the discharge load 14 from reverse charging.
Alternatively, the first anti-reverse module 14 may be a diode anti-reverse module, where an anode of the diode anti-reverse module is connected to the output terminal of the battery 122 and a cathode of the diode anti-reverse module is connected to the second switch S2.
According to the embodiment of the application, the first reverse connection preventing module is arranged, so that the voltage reverse pouring of a discharge load can be effectively avoided, the damage to the battery is caused, the working reliability of the battery is ensured, and the power supply reliability of a direct current power supply system is further ensured.
Fig. 7 is a schematic diagram of a seventh structure of a dc power supply system according to an embodiment of the present application, as shown in fig. 7, in some embodiments of the present application, the dc power supply system further includes a second anti-reverse connection module 15.
A second anti-reverse connection module 15 is connected between the battery module 12 and the dc BUS for preventing reverse charging of the dc BUS voltage.
According to the embodiment of the application, the first reverse connection preventing module is arranged, so that the reverse filling of the battery with the DC bus voltage (the DC bus voltage is slightly higher than the battery voltage when the DC bus voltage works normally) can be effectively avoided, and the battery is prevented from being damaged.
Fig. 8 is a schematic diagram of an eighth structure of a dc power supply system according to an embodiment of the present application, as shown in fig. 8, in some embodiments of the present application, the dc power supply system 10 further includes a third switch S3 connected between the battery module 12 and the dc BUS, where the third switch S3 is in a normally closed state.
Alternatively, the third switch S3 may be controlled by a controller in the battery module 12, such as a second controller, or by the overall controller of the dc power supply system 10. The third switch S3 is in a closed state by default, so that the battery module 12 can be directly connected with the direct current BUS BUS
According to the embodiment of the application, the normally-closed third switch S3 is arranged, so that when the voltage of the direct-current BUS is too high or the battery fails, the third switch S3 can be disconnected to cut off the connection between the battery module 12 and the direct-current BUS BUS, the probability of damage of devices is reduced, and the power supply reliability of a direct-current power supply system is improved.
Fig. 9 is a ninth structural schematic diagram of a dc power supply system according to an embodiment of the present application, as shown in fig. 9, in some embodiments of the present application, the dc power supply system 10 further includes a third anti-reverse connection module 16 and a fourth switch S4.
The third reverse connection preventing module 16 is connected between the fourth switch S4 and the dc BUS for preventing reverse charging of the dc BUS voltage, the fourth switch S4 is also connected with the rectifying module 11, and the fourth switch S4 is in a normally closed state.
The third reverse connection preventing module 16 is used for preventing the direct current BUS voltage from reversely flowing into the rectifying module 11.
Alternatively, the fourth switch S4 may be a relay, a contactor, or an empty switch. The fourth switch S4 may be controlled by a controller of the rectifying module 11, such as the first controller 112, or by a controller of the dc power supply system.
According to the embodiment of the application, the normally-closed fourth switch S4 is arranged, so that when the voltage of the direct-current BUS is too high or the battery fails, the fourth switch S4 can be disconnected to cut off the connection between the rectifying module 11 and the direct-current BUS BUS, the probability of damage of devices is reduced, and the power supply reliability of a direct-current power supply system is improved.
Fig. 10 is a schematic diagram of a tenth structure of the dc power supply system according to the embodiment of the present application, as shown in fig. 10, in which the battery may be subjected to a discharge test by a discharge test circuit through a discharge trolley, the charging unit may charge the battery through a charging circuit, and the battery may discharge the battery through a discharge circuit to a dc bus.
As shown in fig. 10, QF3 is a battery switch, and when closed, the battery can be charged and discharged, so that the battery can be isolated independently, and the battery can be maintained independently. QF4 is the output switch of battery, is in the closed state under the normal condition.
The operation of the dc power supply system shown in fig. 10 is as follows:
The power grid charges the battery through the charging unit, enters a dormant state after the battery is full, and can activate the awakening battery through the discharging loop or the discharging test loop. The output voltage of the rectifying unit is controlled to always follow the voltage output of the battery within a preset voltage range, and the output voltage of the rectifying unit is always larger than the voltage of the battery, so that the power grid is ensured to supply power to the direct current bus preferentially through the rectifying unit, and long-term stable output is provided for the direct current bus. At the same time, the battery is prevented from being frequently awakened and discharged. In addition, through setting up the diode and preventing the anti-, the physical isolation rectification unit charges for the battery, guarantees DC power supply system's power supply efficiency.
The embodiment of the application also provides integrated power supply equipment, which comprises the direct current power supply system of any embodiment.
In the embodiment of the present application, the dc power supply system in the above embodiment may be provided in a dc cabinet. The integrated power supply equipment can further comprise an alternating current cabinet, a direct current feeder cabinet, a communication power supply cabinet, a charging cabinet, a battery cabinet and an integrated cabinet, wherein the integrated cabinet can replace combined equipment serving as the direct current cabinet and the charging cabinet.
The foregoing embodiments are merely for illustrating the technical solution of the present application, but not for limiting the same, and although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that modifications may be made to the technical solution described in the foregoing embodiments or equivalents may be substituted for parts of the technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solution of the embodiments of the present application in essence.
Claims (10)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103618368A (en) * | 2013-12-10 | 2014-03-05 | 山东圣阳电源股份有限公司 | High-voltage direct current power supply system |
| CN104485727A (en) * | 2014-12-26 | 2015-04-01 | 广州市香港科大霍英东研究院 | Off-grid photovoltaic power generation energy storage system and energy dispatching method thereof |
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| JP2017204992A (en) * | 2016-05-13 | 2017-11-16 | 株式会社Ｎｔｔドコモ | DC power supply system |
| CN106325459A (en) * | 2016-08-29 | 2017-01-11 | 浪潮电子信息产业股份有限公司 | Server power supply system and method |
| CN209963766U (en) * | 2019-08-06 | 2020-01-17 | 湖北追日电气股份有限公司 | A microgrid solar energy storage and charging energy control device with a common DC bus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618368A (en) * | 2013-12-10 | 2014-03-05 | 山东圣阳电源股份有限公司 | High-voltage direct current power supply system |
| CN104485727A (en) * | 2014-12-26 | 2015-04-01 | 广州市香港科大霍英东研究院 | Off-grid photovoltaic power generation energy storage system and energy dispatching method thereof |
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