CN112086955A - Multi-battery mutual backup direct current system for transformer substation and automatic control method thereof - Google Patents
Multi-battery mutual backup direct current system for transformer substation and automatic control method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000007600 charging Methods 0.000 claims abstract description 50
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims description 7
- 238000010277 constant-current charging Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 101000984533 Homo sapiens Ribosome biogenesis protein BMS1 homolog Proteins 0.000 claims 1
- 102100027057 Ribosome biogenesis protein BMS1 homolog Human genes 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000002253 acid Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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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
- H02J7/007—Regulation of charging or discharging current or voltage
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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
Abstract
The invention discloses a multi-group battery mutual backup direct current system for a transformer substation and an automatic control method thereof, wherein the system comprises a direct current bus, a direct current load and a charging unit, the direct current bus is electrically connected with the direct current load, the direct current bus is electrically connected with the charging unit, and the charging unit comprises: the device comprises a voltage-reducing current-limiting charging circuit, a hardware discharging circuit and a BMS monitoring circuit; the voltage-reducing current-limiting charging circuit, the direct-current bus and the battery pack are connected in series; the hardware discharge circuit comprises a diode, the diode is connected with the single-pole single-throw switch in parallel, the cathode of the diode is electrically connected with the direct-current bus, and the anode of the diode is electrically connected with the battery pack; the BMS monitoring circuit is electrically connected with the battery pack in parallel; the consistency requirement on the battery pack is reduced, and the voltage stability of a direct current bus in a charging state and the seamless connection of commercial power outage are realized; the single overvoltage protection of the battery is effectively realized, and the service life of the battery is prolonged; and multiple groups of devices are mutually prepared, and the safe and reliable operation of the system is realized.
Description
Technical Field
The invention belongs to the technical field of substation direct current standby power application, and relates to a multi-battery mutual standby direct current system for a substation and an automatic control method thereof.
Background
At present, a direct current system of a transformer substation is power supply equipment which is applied to hydraulic power plants, thermal power plants, various transformer substations and other users using direct current equipment and provides direct current power supply for signal equipment, protection, automatic devices, emergency lighting, emergency power supply and breaker opening and closing operations; the transformer substation direct current system is used as an independent power supply, is not influenced by a generator, service power and a system operation mode, and ensures that the backup power supply-storage battery continuously provides important equipment of the direct current power supply under the condition of external alternating current interruption. The traditional valve lead-acid battery adopts a direct current direct hanging mode, and generally adopts a single-group system to prepare power under a floating charge state; once the battery pack fails, the power failure condition occurs at the same time, which can cause a significant power failure disaster; in addition, if the lead-acid batteries are multiple groups, the requirement on the uniformity of the battery pack is higher. The multiple groups of lead-acid batteries are mutually prepared in a parallel interconnection system, and the multiple groups of batteries respectively supply a control bus and a combined bus, so that the multiple groups of lead-acid batteries are mutually prepared in a scheme, and the following problems exist: (1) when a plurality of groups of batteries are merged into the direct current bus, the batteries can be merged into the direct current bus only after the voltages of all the battery packs are adjusted to be consistent; (2) the consistency requirement on multiple groups of batteries is high, the battery pack is in a continuous high-voltage floating state, the total voltage of the battery pack is unchanged, and the damage to the monomer is large in the lagging state of the monomer; (3) in the float state, the battery pack is in a high-voltage state. The battery pack is repeatedly charged in a high SOC state, so that the service life of the battery is greatly influenced; (4) the lead-acid battery has weak over-current capability, and the voltage drop is large under the large-current impact state, so that the control bus and the control bus must be separated, or the control bus and the control bus are isolated by a voltage reduction silicon chain, and the system needs to be configured with 30% more electric quantity to ensure that the voltage does not drop too fast.
Disclosure of Invention
The invention provides a multi-group battery mutual backup direct current system for a transformer substation and an automatic control method thereof, which are used for solving the problems in the prior art, reducing the requirement on the consistency of a battery pack, and realizing the voltage stabilization of a direct current bus in a charging state and the seamless connection of commercial power failure; the single overvoltage protection of the battery is effectively realized, and the service life of the battery is prolonged; and multiple groups of devices are mutually prepared, and the safe and reliable operation of the system is realized.
The invention discloses a multi-battery mutual backup direct current system for a transformer substation, which comprises a direct current bus, a direct current load and a charging unit, wherein the direct current bus is electrically connected with the direct current load, the direct current bus is electrically connected with at least two charging units, and the charging unit comprises: the device comprises a voltage-reducing current-limiting charging circuit, a hardware discharging circuit and a BMS monitoring circuit; the voltage-reducing current-limiting charging circuit, the direct-current bus and the battery pack are connected in series; the hardware discharge circuit comprises a diode, the diode is connected with the single-pole single-throw switch in parallel, the cathode of the diode is electrically connected with the direct-current bus, and the anode of the diode is electrically connected with the battery pack; the BMS monitoring circuit is electrically connected in parallel with the battery pack.
The multi-group battery mutual backup direct current system for the transformer substation can comply with the current requirement set by the battery system, and the battery pack is charged by reducing the voltage of the direct current bus so as to ensure the stability of the voltage of the direct current bus and realize the parallel connection of a plurality of groups of battery systems in different capacity states on the basis of ensuring the stability of the voltage of the direct current bus.
Wherein each of the battery systems may have a respective unique code. The battery systems can be connected in a communication mode.
The automatic control method of the multi-group battery mutual backup direct current system for the transformer substation comprises the following steps:
the BMS1 (battery management system 1) of the battery pack B1 is connected to the direct-current bus voltage V1, so that the voltage of the battery pack B1 is V2;
when the voltage V1-V2> is a preset value, the SPDT1(Single Pole Double thread) of the battery pack B1 is controlled to be disconnected, the voltage reduction current limiting charging circuit is started to charge the battery of the battery pack B1, the 1# battery of the battery pack B1 is discharged to enable the Single voltage to be the preset value, or the total voltage > bus voltage, the SPST1 is directly closed, and the direct-hanging direct current bus is merged.
According to the automatic control method of the multi-group battery mutual backup direct current system for the transformer substation, in the current-limiting charging process, the loop of the diode of the hardware discharging circuit is conducted, so that sudden power loss of the multi-group battery mutual backup direct current system for the transformer substation in the charging process is avoided. And when the transformer substation uses a plurality of groups of batteries to mutually support the direct current system to receive the working signal of the diode, the diode is connected with the loop switch to avoid the diode from heating.
In order to avoid floating charge of the battery, shorten the service life of the battery, avoid overvoltage of a single battery caused by a long-term floating charge state of a battery pack, and solve the problem that the service life of a multi-group battery mutual-backup direct current system for the transformer substation is shortened, the automatic control method of the multi-group battery mutual-backup direct current system for the transformer substation can further comprise the following steps:
constant current voltage limiting is carried out through the voltage reduction current limiting charging circuit, and constant current charging of a multi-group battery mutual backup direct current system for the transformer substation is completed;
after the constant-current charging is finished, closing the direct-connected switch to form a direct-hanging direct-current bus, and entering a voltage-limiting charging stage;
disconnecting the direct connection switch to enable the transformer substation to enter an open circuit standing stage by using a multi-group battery mutual backup direct current system;
when the voltage of the battery is detected to be lower than a preset value, the transformer substation uses a multi-group battery mutual-backup direct current system to repeat the steps;
when the commercial power failure occurs in the multi-battery mutual backup direct current system for the transformer substation, the multi-battery mutual backup direct current system for the transformer substation discharges through the diode, and the BMS closes the direct connection switch after detecting that the diode discharges, so that the discharge of the multi-battery mutual backup direct current system for the transformer substation is completed.
In order to realize that a certain battery system can actively withdraw after the battery system has a fault and automatically merge into the transformer substation to work by using the multiple groups of battery mutual-backup direct current systems after maintenance, the automatic control method of the multiple groups of battery mutual-backup direct current systems for the transformer substation can further comprise the following steps:
and each battery system is subjected to unique coding, and communication connection can be carried out between the battery systems.
In addition, one of the battery systems can be used for carrying out external communication and internal coordination on the operation of each sub-battery system, for example, the 1# battery system can be used for carrying out external communication and internal coordination on the operation of each sub-battery system, so that the battery system can be actively withdrawn after a certain battery system fails, and can be automatically merged into the transformer substation after maintenance to work by using a multi-group battery mutual-backup direct-current system.
The invention has the beneficial effects that:
the invention relates to a multi-group battery mutual backup direct current system for a transformer substation and an automatic control method thereof, which can solve the following problems in the prior art: (1) in the process of parallel connection of a plurality of battery packs, the voltage of each battery pack needs to be manually adjusted, the parallel connection time is long, the system adopts current limiting and automatic parallel connection, and less manual investment is required; (2) under the long-term floating charge state, the service life of the battery is influenced, the single short plate is easy to be worn, the system adopts a BMS to monitor the voltage of each battery, adopts an intelligent intermittent discharge mode, and protects the system by disconnecting the charging mode when the battery is in a full charge state or the single short plate appears; (3) a plurality of lead-acid batteries are needed to solve the problem of system voltage drop in a high-current impact state; the multi-group battery mutual backup direct current system for the transformer substation can adopt a lithium iron phosphate system, has small voltage drop under the heavy current state, and can use batteries with small capacity to meet the system requirements; meanwhile, a plurality of groups of battery systems are mutually standby in parallel, so that the safety and reliability of the system are enhanced; the transformer substation is mutually prepared by multiple groups of the direct current system with multiple groups of batteries, so that safe and reliable operation of the system is realized. The automatic control method of the multi-battery mutual backup direct current system for the transformer substation can realize automatic control of multiple battery systems under the unattended condition and merge into a direct current bus, and has low requirement on the consistency of battery packs; the direct-current bus voltage stabilization and commercial power outage seamless connection under the charging state can be realized; and the single overvoltage protection of the battery can be effectively realized, and the service life of the battery is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a battery system reference diagram of a multi-battery mutual backup dc system for a substation according to the present invention.
Fig. 2 is a voltage waveform diagram of the charging limit of the multi-battery backup dc system for a substation according to the present invention.
Fig. 3 is a block flow diagram of an automatic control system of a multi-battery backup dc system for a substation according to an embodiment of the present invention.
Fig. 4 is a block diagram illustrating a flow of an automatic control system of a multi-battery backup dc system for a substation according to another embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Example 1
The utility model provides a transformer substation is with multiunit battery dc system that each other stands by, as shown in fig. 1, includes direct current bus, direct current load and charging unit, direct current bus is connected with the direct current load electricity, be connected with two at least charging unit electricity on the direct current bus, the charging unit includes: the device comprises a voltage-reducing current-limiting charging circuit, a hardware discharging circuit and a BMS monitoring circuit; the voltage-reducing current-limiting charging circuit, the direct-current bus and the battery pack are connected in series; the hardware discharge circuit comprises a diode, the diode is connected with the single-pole single-throw switch in parallel, the cathode of the diode is electrically connected with the direct-current bus, and the anode of the diode is electrically connected with the battery pack; the BMS monitoring circuit is electrically connected in parallel with the battery pack and monitors a voltage of each battery system in the battery pack.
In the multi-battery backup dc system for a substation of this embodiment, the circuit includes a voltage-reducing current-limiting charging circuit, a BMS (battery management system) monitoring circuit, and a hardware discharging circuit, wherein the hardware discharging circuit may be specifically a hardware discharging circuit D1 state; the voltage of each cell in the battery pack is monitored by a BMS monitoring circuit. As shown in fig. 2, fig. 2 is a voltage waveform diagram of the charging limit of the multi-battery mutual backup dc system for the substation, where T1 is a constant current-voltage limiting charging stage, T2 is a constant voltage-current limiting charging stage, T3 is a battery pack open circuit standing stage, T4 is an intermittent power supply stage, and T5 is a discharging stage.
Example 2
The substation described in embodiment 1 uses multiple sets of battery backup dc systems, each of which may have a unique code, such as #1 battery system, #2 battery system, #3 battery system … …, and the battery systems are communicatively connected with each other. One of the battery systems, such as the #1 battery system, is communicated with the outside and coordinates the work of each sub-battery system in the inside, so that when a certain battery system fails, the battery system can be actively withdrawn, and automatically merged into the system to work after maintenance.
In the transformer substation multi-battery mutual backup direct current system according to any of the embodiments, as shown in fig. 1, the diodes discharge in a single direction, and the switches can be directly closed to avoid the diodes from heating; the step-down current-limiting charging is carried out through the step-down current-limiting charging circuit, and charging is carried out under the condition that the bus voltage is not influenced; BMS2 is a backup battery. Wherein the current-limited charging loop may instead be a DC/DC loop.
Example 3
The automatic control method of the mutually backup dc system for multiple groups of batteries for a substation in any embodiment, as shown in fig. 3, includes the following steps:
the BMS1 of the battery pack B1 is connected to the direct-current bus voltage V1, so that the voltage of the battery pack B1 is V2;
when the voltage V1-V2> a preset value, the SPDT1 of the battery pack B1 is controlled to be disconnected, the voltage reduction current limiting charging circuit is started to charge the batteries of the battery pack B1, the 1# batteries of the battery pack B1 are discharged until the single voltage is the preset value, or the total voltage > bus voltage, and the SPST1 is directly closed to be merged into a direct-current bus.
For example, assuming that the bus voltage is 230V, the steps for realizing the bus access of the battery in the battery pack B1 are as follows: the BMS1 is connected to the voltage V1 of the direct current bus, the voltage of the battery pack is V2, when V1-V2 is more than 5V, the SPDT1 is controlled to be disconnected, the current-limiting charging circuit is started to charge the battery, the 1# battery is discharged to reach the single voltage of 3.65V, or the total voltage is more than 230V, the current-limiting charging is cut off, and the SPST1 can be directly closed at the moment and is connected to the direct-hanging direct current bus.
Example 4
The automatic control method of the multi-battery mutual backup direct current system for the substation according to embodiment 3, during the current-limiting charging process, the loop of the diode of the hardware discharging circuit is turned on.
In addition, when the transformer substation uses a plurality of groups of batteries to prepare the DC system with each other and receives the working signal of the diode, the diode is connected with a loop switch.
Specifically, the access process of the battery pack B2 is the same as that of the battery pack B1, each battery pack is controlled by the battery pack B2, and the integration and the separation of the DC bus are automatically realized by the battery pack B2, so that the automatic integration and the separation of the battery packs are realized. Even if the transformer substation is charged by the multi-group battery mutual backup direct current system in a current limiting mode, a discharge diode loop is still conducted, so that sudden power loss of the system in the charging process is avoided. When the transformer substation uses the multi-group battery mutual backup direct current system to find that the discharge diode works, the discharge diode can be switched on at the first time, and the diode is prevented from heating.
Example 5
The automatic control method of the multi-battery backup dc system for a substation according to embodiment 3 or embodiment 4, as shown in fig. 4, further includes the following steps:
constant current voltage limiting is carried out through the voltage reduction current limiting charging circuit, and constant current charging of a multi-group battery mutual backup direct current system for the transformer substation is completed;
after the constant-current charging is finished, closing the direct-connected switch to form a direct-hanging direct-current bus, and entering a voltage-limiting charging stage;
disconnecting the direct connection switch to enable the transformer substation to enter an open circuit standing stage by using a multi-group battery mutual backup direct current system;
when the voltage of the battery is detected to be lower than a preset value (such as XV), the transformer substation uses a multi-group battery mutual-backup direct current system to repeat the actions of the steps;
when the commercial power failure occurs in the multi-battery mutual backup direct current system for the transformer substation, the multi-battery mutual backup direct current system for the transformer substation discharges through the diode, and the BMS closes the direct connection switch after detecting that the diode discharges, so that the discharge of the multi-battery mutual backup direct current system for the transformer substation is completed.
For example, when the bus voltage is 230V, in order to avoid battery float charge and shorten the battery life, the above steps of this embodiment may be adopted by the multi-battery mutual backup dc system for the substation, so as to avoid the problem that the life of the multi-battery mutual backup dc system for the substation is shortened due to overvoltage of a single battery caused by a long-term float charge state of a battery pack.
Example 6
The automatic control method for the multi-battery mutual backup direct current system for the transformer substation in any embodiment further comprises the following steps:
and performing communication connection between the battery systems.
Additionally, each of the battery systems may be individually uniquely coded. Such as a #1 battery system, #2 battery system, #3 battery system … ….
In addition, one of the battery systems can communicate with the outside and coordinate the work of each sub-battery system in the inside. For example, the #1 battery system is used for carrying out external communication and internally coordinating the work of each sub-battery system, so that when a certain battery system fails, the battery system can be actively withdrawn, and the battery system is automatically merged into the system for work after maintenance.
According to the multi-group battery mutual backup direct current system for the transformer substation and the automatic control method thereof, automatic grid connection and fault disconnection of a plurality of battery systems are realized through a direct current system topology-multi-group mutual backup scheme, and battery single bodies are protected in an intermittent charging mode.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. The utility model provides a transformer substation is with multiunit battery dc system that each other is equipped with, includes direct current bus, direct current load and charging unit, direct current bus is connected with the direct current load electricity, be connected with two at least charging unit electricity on the direct current bus, its characterized in that, charging unit includes: the device comprises a voltage-reducing current-limiting charging circuit, a hardware discharging circuit and a BMS monitoring circuit; the voltage-reducing current-limiting charging circuit, the direct-current bus and the battery pack are connected in series; the hardware discharge circuit comprises a diode, the diode is connected with the single-pole single-throw switch in parallel, the cathode of the diode is electrically connected with the direct-current bus, and the anode of the diode is electrically connected with the battery pack; the BMS monitoring circuit is electrically connected in parallel with the battery pack.
2. The substation multi-battery mutual backup direct current system according to claim 1, wherein the battery systems are communicatively connected with each other.
3. The substation multi-battery mutual backup dc system according to claim 2, wherein each battery system has a respective unique code.
4. The automatic control method of the multi-battery mutual backup direct current system for the substation according to any one of claims 1 to 3, characterized by comprising the steps of:
the BMS1 of the battery pack B1 is connected to the direct-current bus voltage V1, so that the voltage of the battery pack B1 is V2;
when the voltage V1-V2> a preset value, the SPDT1 of the battery pack B1 is controlled to be disconnected, the voltage reduction current limiting charging circuit is started to charge the batteries of the battery pack B1, the 1# batteries of the battery pack B1 are discharged until the single voltage is the preset value, or the total voltage > bus voltage, and the SPST1 is directly closed to be merged into a direct-current bus.
5. The automatic control method of the multi-battery mutual backup direct current system for the substation according to claim 4, wherein a loop of the diode of the hardware discharge circuit is conducted during a current-limiting charging process.
6. The automatic control method of the multiple-battery-pack mutual-backup direct current system for the substation according to claim 5, wherein when the multiple-battery-pack mutual-backup direct current system for the substation receives an operating signal of the diode, the diode is turned on a loop switch.
7. The automatic control method of the multi-battery mutual backup direct current system for the substation according to any one of claims 4 to 6, characterized by further comprising the steps of:
constant current voltage limiting is carried out through the voltage reduction current limiting charging circuit, and constant current charging of a multi-group battery mutual backup direct current system for the transformer substation is completed;
after the constant-current charging is finished, closing the direct-connected switch to form a direct-hanging direct-current bus, and entering a voltage-limiting charging stage;
disconnecting the direct connection switch to enable the transformer substation to enter an open circuit standing stage by using a multi-group battery mutual backup direct current system;
when the voltage of the battery is detected to be lower than a preset value, the transformer substation uses a multi-group battery mutual-backup direct current system to repeat the steps;
when the commercial power failure occurs in the multi-battery mutual backup direct current system for the transformer substation, the multi-battery mutual backup direct current system for the transformer substation discharges through the diode, and the BMS closes the direct connection switch after detecting that the diode discharges, so that the discharge of the multi-battery mutual backup direct current system for the transformer substation is completed.
8. The automatic control method of the multi-battery mutual backup direct current system for the substation according to any one of claims 4 to 6, characterized by further comprising the steps of:
and performing communication connection between the battery systems.
9. The automatic control method of a multi-battery mutual backup direct current system for a substation of claim 8, wherein each battery system is individually uniquely coded.
10. The automatic control method of the multi-battery mutual-backup direct current system for the substation according to claim 9, wherein one of the battery systems is communicated with the outside and coordinated with the operation of each sub-battery system in the inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010731363.8A CN112086955A (en) | 2020-07-27 | 2020-07-27 | Multi-battery mutual backup direct current system for transformer substation and automatic control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010731363.8A CN112086955A (en) | 2020-07-27 | 2020-07-27 | Multi-battery mutual backup direct current system for transformer substation and automatic control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112086955A true CN112086955A (en) | 2020-12-15 |
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| CN114884167A (en) * | 2022-05-13 | 2022-08-09 | 国网湖北省电力有限公司宜昌供电公司 | Direct current control system of transformer substation based on lithium iron phosphate storage battery |
| CN115954976A (en) * | 2022-12-29 | 2023-04-11 | 中国铁塔股份有限公司 | Power supply system controlled by multiple paths of bidirectional and independent branches and charge-discharge control method |
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