CN112542851A - Black start circuit and charge-discharge pile of power grid - Google Patents

Black start circuit and charge-discharge pile of power grid Download PDF

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Publication number
CN112542851A
CN112542851A CN202011318938.XA CN202011318938A CN112542851A CN 112542851 A CN112542851 A CN 112542851A CN 202011318938 A CN202011318938 A CN 202011318938A CN 112542851 A CN112542851 A CN 112542851A
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China
Prior art keywords
main power
module
black start
unit
power module
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Granted
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CN202011318938.XA
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Chinese (zh)
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CN112542851B (en
Inventor
彭鹏
陈满
李勇琦
胡振恺
李毓烜
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Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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Priority to CN202011318938.XA priority Critical patent/CN112542851B/en
Publication of CN112542851A publication Critical patent/CN112542851A/en
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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles
    • Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/126—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/12—Remote or cooperative charging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/14—Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

The invention relates to a black start circuit and a charging and discharging pile for a power grid. This electric wire netting black start circuit includes: the main power module is used for connecting a power grid and the electric vehicle and carrying out charging or discharging treatment on the electric vehicle; the monitoring module is connected with the main power module and is used for monitoring the main power module; and the black start module is respectively connected with the main power module and the monitoring module and used for providing start signals for the main power module and the monitoring module when the main power module and the monitoring module are powered off, so that the electric vehicle discharges to a power grid through the main power module to provide energy. The power grid black start circuit and the charging and discharging pile can restore the normal operation of the power grid and the charging and discharging pile without utilizing a unit with self-starting capability in the power grid to gradually expand the recovery range of the power grid and carrying out manual investigation and series operation on the power grid, so that the speed and the convenience for restoring the normal operation of the power grid and the charging and discharging pile are improved, and the cost for black start of the power grid is reduced.

Description

Black start circuit and charge-discharge pile of power grid
Technical Field
The invention relates to the technical field of black start of power systems, in particular to a black start circuit and a charging and discharging pile of a power grid.
Background
In the power system, the 'black start' means that after the power grid is broken down and stopped due to faults, the power grid is completely powered off and is in a full 'black' state, the power grid is not dependent on the help of other networks, and the unit without self-starting capability is driven by starting the unit with self-starting capability in the system, so that the recovery range of the power grid is gradually expanded, and the recovery of the whole power grid is finally realized. In the traditional method, the starting of the unit with the self-starting capability in the power grid is utilized to drive the unit without the self-starting capability to gradually expand the recovery range of the power grid, and the recovery range of the power grid is gradually expanded by combining manual investigation and series operation, so that the recovery of the whole power grid can be finally realized, and the problems that the time for the whole power grid to be in a completely black state is too long, the speed for the power grid to recover to normal operation is slow and the like are caused.
Disclosure of Invention
Based on this, it is necessary to provide a black start circuit for a power grid.
A grid black start circuit comprising:
the main power module is used for connecting a power grid and the electric vehicle and carrying out charging or discharging treatment on the electric vehicle;
the monitoring module is connected with the main power module and is used for monitoring the main power module;
and the black start module is respectively connected with the main power module and the monitoring module and used for providing start signals for the main power module and the monitoring module when the main power module and the monitoring module are powered off, so that the electric vehicle discharges to a power grid through the main power module to provide energy.
In one embodiment, the black start module includes: the main power black start unit is connected with the main power module and used for providing a first main power module start signal for the main power module when the main power module is powered off; and the monitoring black start unit is connected with the monitoring module and used for providing a monitoring module start signal for the monitoring module when the monitoring module is powered off, so that the monitoring module operates and provides a second main power module start signal for the main power module.
In one embodiment, the black start module further includes: and the energy storage unit is connected with the main power black start unit and the monitoring black start unit and is used for supplying power to the main power black start unit and the monitoring black start unit.
In one embodiment, the energy storage unit includes: a storage battery and a voltage stabilizer; one end of the voltage stabilizer is connected with the storage battery, and the other end of the voltage stabilizer is connected with the main power black start unit and the monitoring black start unit and is used for performing voltage stabilization processing on a voltage signal output by the storage battery to obtain a first voltage signal and respectively outputting the first voltage signal to the main power black start unit and the monitoring black start unit.
In one embodiment, the energy storage unit further comprises: and one end of the control switch is connected with the storage battery, and the other end of the control switch is respectively connected with the main power black start unit and the monitoring black start unit and is used for controlling the power supply states of the main power black start unit and the monitoring black start unit.
In one embodiment, the monitoring black start unit includes: the first controlled switch is connected with the voltage stabilizer, the control switch and the monitoring module and used for conducting the voltage stabilizer and the monitoring module when the control switch is closed, and a first voltage signal output by the voltage stabilizer is used as a monitoring module starting signal to be provided for the monitoring module, so that the monitoring module operates and provides a second main power module starting signal for the main power module.
In one embodiment, the main power black start unit includes: a second controlled switch and a booster; the second controlled switch is connected with the control switch and the voltage stabilizer, and the booster is connected with the second controlled switch and the main power module; the second controlled switch is used for conducting the voltage stabilizer and the voltage booster when the control is closed; the booster is used for boosting the first voltage signal output by the voltage stabilizer to obtain a first main power module starting signal and outputting the first main power module starting signal to the main power module.
In one embodiment, the black start module further includes: and the automatic charging unit is connected with the main power module and the energy storage unit and is used for charging the energy storage unit through the main power module when the electric vehicle discharges to the power grid through the main power module or the power grid charges the electric vehicle through the main power module.
In one embodiment, the automatic charging unit includes: the voltage reducer is connected with the main power module and used for reducing the voltage of the voltage signal output by the main power module to obtain a second voltage signal and transmitting the second voltage signal to the energy storage unit; and the third controlled switch is connected with the voltage reducer and the energy storage unit and is used for conducting the main power module and the energy storage unit when the electric vehicle discharges to the power grid through the main power module or the power grid charges the electric vehicle through the main power module.
In one embodiment, the application further provides a charging and discharging pile, and the charging and discharging pile comprises the power grid black-start circuit.
The black start circuit and the charge-discharge pile of the power grid complete the charging treatment of the power grid on the electric vehicle or the discharging treatment of the electric vehicle on the power grid through the main power module; the monitoring module monitors and controls the main power module; when the main power module and the monitoring module are powered off, the black start module provides a start signal for the main power module and the monitoring module, so that the electric vehicle discharges to a power grid through the main power module to provide energy. Therefore, the power grid black-start circuit and the charging and discharging pile do not need to utilize a unit with self-starting capability in a power grid to gradually expand the power grid recovery range, do not need to manually check and perform series operation on the power grid, and even if the power grid and the charging and discharging pile recover to normally operate, the speed and the convenience for recovering the normal operation of the power grid and the charging and discharging pile are improved, and meanwhile, the cost of the power grid black-start is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a first schematic block diagram of a black start circuit of an embodiment;
FIG. 2 is a block schematic block diagram of one of the main power blocks of FIG. 1;
FIG. 3 is a block schematic block diagram of one of the monitoring modules of FIG. 1;
FIG. 4 is a flowchart of a monitoring control routine of the central monitoring unit;
FIG. 5 is a flowchart of the initialization and data interaction phase control timing sequence of FIG. 4;
FIG. 6 is a timing diagram illustrating the self-test and insulation test control of FIG. 5;
FIG. 7 is a second schematic block diagram of a black start circuit of an embodiment;
FIG. 8 is a third schematic block diagram of an embodiment of a black start circuit of a power grid;
FIG. 9 is a schematic block diagram of one embodiment of the energy storage unit of FIG. 8;
fig. 10 is a schematic block diagram of another module of the energy storage unit of fig. 8;
FIG. 11 is a block schematic diagram of a main power black start unit of FIG. 8;
FIG. 12 is a fourth schematic block diagram of a black start circuit of an embodiment;
FIG. 13 is a schematic block diagram of one of the automatic charging units of FIG. 12;
fig. 14 is a fifth schematic structural diagram of a black start circuit of a power grid in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
With the continuous improvement of human environmental protection consciousness and resource protection consciousness, new energy electric vehicles are gradually replacing fuel automobiles. At present, users of new energy electric vehicles mainly complete charging and discharging of vehicle-mounted power supplies through charging and discharging piles arranged in public areas such as parking lots and charging stations, however, the charging and discharging piles are generally directly connected into a power grid through a way of using electricity by residents.
In the power system, the 'black start' means that after the power grid is broken down and stopped due to faults, the power grid is completely powered off and is in a full 'black' state, the power grid is not dependent on the help of other networks, and the unit without self-starting capability is driven by starting the unit with self-starting capability in the system, so that the recovery range of the power grid is gradually expanded, and the recovery of the whole power grid is finally realized. In the traditional method, the starting of the unit with the self-starting capability in the power grid is utilized to drive the unit without the self-starting capability to gradually expand the recovery range of the power grid, so that the recovery of the whole power grid and the charging and discharging piles can be finally realized, and the problems that the time for the whole power grid to be in a full black state is too long, the speed for the power grid and the charging and discharging piles to recover to normal operation is slow and the like are caused. For the traditional power grid black start, manual investigation and series complex operation are combined, so that the problems of high power grid start cost, complex operation and the like are caused. Therefore, the embodiment of the application provides a black start circuit and a charging and discharging pile for a power grid, which do not need to perform manual troubleshooting and series complex operations on the power grid, and do not need to gradually enlarge the recovery range of the power grid to realize normal operation of the whole power grid and the charging and discharging pile, so that the speed and convenience for recovering the normal operation of the power grid and the charging and discharging pile are improved, and the start cost of the power grid is reduced. The method and the device for controlling the power system to be in the power system can be applied to not only completing 'black start' operation on the power grid after the power grid is broken down and shut down due to faults in the power system, but also being applied to scenes that the electric vehicle discharges to the power grid or the power grid charges the electric vehicle.
In one embodiment, as shown in fig. 1, a grid black start circuit is provided, which includes a main power module 100, a monitoring module 200, and a black start module 300. The main power module 100 is used to connect a power grid and an electric vehicle, and charge or discharge the electric vehicle. The monitoring module 200 is connected to the main power module 100 for monitoring the main power module 100. The black start module 300 is respectively connected to the main power module 100 and the monitoring module 200, and is configured to provide a start signal to the main power module 100 and the monitoring module 200 when the main power module 100 and the monitoring module 200 are powered off, so that the electric vehicle discharges to the power grid through the main power module 100 to provide energy.
The main power module 100 is a module or a device that can be used to connect a grid and an electric vehicle and perform a charging or discharging process on the electric vehicle. In this embodiment, the electric vehicle mainly uses the vehicle-mounted power supply as power, and can solve the problems of high energy consumption, tail gas emission, environmental pollution and the like of the fuel oil vehicle. When the power grid normally operates, the main power module 100 processes the ac signal in the power grid and transmits the processed ac signal to the electric vehicle for charging. When the power grid is completely powered off due to breakdown, the main power module 100 processes the dc signal of the vehicle-mounted power supply in the electric vehicle and transmits the processed dc signal to the power grid, so as to discharge the electric vehicle.
In one embodiment, as shown in fig. 2, the main power module 100 includes an ac power distribution unit 110, an ac-dc conversion unit 120, a dc voltage regulation unit 130, and a dc power distribution unit 140. One end of the ac/dc conversion unit 120 is connected to the ac power distribution unit 110, and the other end is connected to the dc voltage regulation unit 130; the dc voltage regulating unit 130 is also connected to the dc distribution unit 140.
When the power grid normally operates, the ac power distribution unit 110 is configured to distribute an ac power signal transmitted in the power grid to which the main power module 100 is connected; the ac-dc conversion unit 120 takes the ac power signal distributed and processed by the ac power distribution unit 110 as a power supply voltage, and transforms and ac-dc converts the distributed and processed ac power signal to output a first dc voltage signal; the dc voltage regulating unit 130 takes the first dc voltage signal output by the ac-dc converting unit 120 as a power supply voltage, and is configured to regulate the first dc voltage signal to output a second dc voltage signal; the dc distribution unit 140 is configured to distribute the second dc voltage signal, and further configured to provide the distributed dc voltage signal to the electric vehicle for charging. When the power grid is completely powered off due to breakdown, breakdown and shutdown, the direct current power distribution unit 140 can distribute and process direct current signals emitted by the main power module 100 connected to the electric vehicle; the dc voltage regulating unit 130 takes the dc signal distributed and processed by the dc distribution unit 140 as a power supply voltage, and performs dc voltage regulation processing on the distributed and processed dc signal to output a third dc voltage signal; the ac-dc conversion unit 120 uses the third dc voltage signal output by the dc voltage regulation unit 130 as a power supply voltage, and is configured to transform the third dc voltage signal and perform dc-ac conversion to output a fourth dc voltage signal; the ac power distribution unit 110 is configured to distribute the fourth dc voltage signal, and further configured to provide the distributed dc voltage signal to the power grid to achieve discharging of the electric vehicle.
In the present embodiment, the ac power distribution unit 110 is a circuit or a device capable of performing distribution processing on an ac voltage signal. In one embodiment, the ac power distribution unit 110 may be an ac power distributor or an ac power distribution cabinet, or may be a circuit unit formed by other electrical components as long as the above functions are achieved. The ac/dc conversion unit 120 is a circuit or a device capable of converting an ac voltage signal into a dc voltage signal or converting a dc voltage signal into an ac voltage signal, and the ac/dc conversion unit 120 needs a voltage value V after power failure1The start signal of the controller is started to restore normal operation. In one embodiment, the AC/DC conversion unit 120 may be an AC/DC converter, or may be a circuit unit formed by other electrical components as long as the above functions are achieved. The dc voltage regulating unit 130 is a circuit or a device capable of transforming or stabilizing a dc voltage signal, and the dc voltage regulating unit 130 needs a voltage value V after power failure2The start signal of the controller is started to restore normal operation. In one embodiment, the DC voltage regulating unit 130 may be a DC/DC converter, or may be a circuit unit formed by other electrical components as long as the above functions are realized. The dc distribution unit 140 is a circuit or a device capable of performing distribution processing on a dc voltage signal. In one embodiment, the dc power distribution unit 140 may be a dc power distributor or a dc power distribution cabinet, or may be a circuit unit formed by other electrical components.
In the present embodiment, the main power module 100 can efficiently charge and discharge the electric vehicle by the cooperation of the ac power distribution unit 110, the ac/dc conversion unit 120, the dc voltage regulation unit 130, and the dc power distribution unit 140.
The monitoring module 200 is a module or device that can be used to monitor the master rate module 100. The monitoring module 200 monitors the operation state of the main power module 100 and controls the operation power, the operation state, and the like of the main power module 100 during the charging, discharging, and black-start of the main power module 100. In one embodiment, as shown in fig. 3, the monitoring module 200 includes a second ac-dc conversion unit 210, a first anti-reverse unit 220, and a central monitoring unit 230; one end of the first anti-reverse unit 220 is connected to the second ac/dc conversion unit 210, and the other end is connected to the central monitoring unit 230.
The second ac/dc conversion unit 210 may be connected to the same power grid to which the main power module 100 is connected, or may be connected to another power grid, and is configured to transform and ac/dc convert an ac electrical signal of the power grid to output a fifth dc voltage signal. In one embodiment, the second AC/DC conversion unit 210 may be an AC/DC converter, or may be a circuit unit formed by other electrical components as long as the above functions are achieved.
The first anti-reverse unit 220 is used to prevent the current generated by the main power module 100 during operation from flowing back to the second ac/dc converting unit 210 through the central monitoring unit 230, which may cause the second ac/dc converting unit 210 to be damaged. In one embodiment, the first anti-reverse unit 220 may be a diode, an anode of the diode is connected to the second ac/dc converting unit 210, and a cathode of the diode is connected to the central monitoring unit 230; the first anti-reverse unit 220 may also be a circuit unit formed of other electrical components as long as the above-described functions are achieved.
The central monitoring unit 230 is connected to all components of the main power module 100, and uses the fifth dc voltage signal output by the second ac/dc converting unit 210 as a supply voltage for monitoring the operation of the main control rate module 100. In one embodiment, as shown in fig. 4, the monitoring control timing of the central monitoring unit 230 is divided into the following four phases during the charging, discharging and black start of the master rate module 100:
first, unconnected phase; when the main power module 100 is not connected to the charging gun stand of the electric vehicle, the central monitoring unit 230 performs state recognition detection on the main power module 100 to prepare for the charging, discharging, and black start processes of the main power module 100.
Secondly, initializing and data interaction; when the main power module 100 has been connected to the charging emergency seat of the electric vehicle, the central monitoring unit 230 completes the initialization work of the main power module 100 and the data interworking between the main power module 100 and the electric vehicle according to the requirements of the relevant standards. For example, the relevant standards may be a national standard of an electric vehicle conductive charging system (GB/T18487), a national standard regarding a communication protocol between an electric vehicle off-board pass-through charger and a battery management system (GB/T27930), and the like, and are not particularly limited herein. In one embodiment, as shown in fig. 5, the central monitoring unit 230 completes the initialization function operation of the main power module 100 and the data interaction operation between the main power module 100 and the electric vehicle according to the flow of the self-test timing sequence, the insulation detection and the data interaction; as shown in fig. 6, when the main power module 100 is in the charging, discharging and black start processes, the central monitoring unit 230 needs to establish the detection voltage, i.e. the second main power module start signal, when the modules in the self-test process and the insulation test process monitoring control sequence are set to be opened.
Thirdly, an energy transmission stage; the central monitoring unit 230 acquires a relative minimum value according to the power-related elements as actual power of the main power module 100 in the charging and discharging processes and transmits the actual power to the main power module 100; in one embodiment, the power-related elements mainly include: simulating a maximum operating power, voltage, and current of a Battery Management System (BMS) for the electric vehicle; maximum operating power, voltage, and current of the main power module 100; and the charging and discharging power is transmitted by a station level monitoring system positioned at the electric vehicle station.
Fourthly, closing; the central monitoring unit 230 sends a shutdown signal to the master power module 100 causing the master power module 100 to exit operation or the master power module 100 has reached an operational boundary.
In the present embodiment, the central monitoring unit 230 in the monitoring module 200 performs monitoring control on the charging, discharging and black-start processes of the main power module 100 through the unconnected phase, the initialization and data interaction phase, the energy transmission phase and the shutdown phase. Based on this, the monitoring module 200 can monitor and control the operation of the main power module 100 in real time and accurately.
The black start module 300 is a module or means for providing a start signal to the main power module 100 and the monitoring module 200 when the main power module 100 and the monitoring module 200 are powered off, so that the electric vehicle discharges to the grid through the main power module 100 to provide energy. When the main power module 100 and the monitoring module 200 are in a power-off state after power failure due to a fault of a connected power grid, if the starting voltages required by the main power module 100 and the monitoring module 200 are the same, the black start module 300 will fully automatically complete the supply of the starting signals meeting the starting voltage requirements to the main power module 100 and the monitoring module 200 after starting, so that the main power module 100 and the monitoring module 200 are restored to operate, and thus the electric vehicle discharges to the power grid through the main power module 100 to provide energy to restore the normal operation of the power grid.
Therefore, the power grid black-start circuit related in the embodiment can realize normal operation of the whole power grid and the charging and discharging pile without manual troubleshooting and series complex operation on the power grid and gradual expansion of the recovery range of the power grid, so that the speed and convenience for recovering the normal operation of the power grid and the charging and discharging pile are improved, and the power grid start cost is reduced. In addition, the power grid black-start circuit related in the embodiment can be applied to not only the situation that the power grid in the power system needs to complete the black-start operation on the power grid after the power grid is broken down and stopped due to faults, but also the situation that the electric vehicle discharges to the power grid or the power grid charges the electric vehicle, so that the application situation of the power grid black-start circuit is wider.
In one embodiment, as shown in fig. 7, the black start module 300 includes a main power black start unit 310 and a monitoring black start unit 320; the main power black start unit 310 is connected to the main power module 100, and configured to provide a first main power module start signal to the main power module 100 when the main power module 100 is powered off; the monitoring black start unit 320 is connected to the monitoring module 200, and is configured to provide a monitoring module start signal to the monitoring module 200 when the monitoring module 200 is powered off, so that the monitoring module 200 operates and provides a second main power module start signal to the main power module 100.
The main power black start unit 310 is a circuit unit or device for providing a first main power module start signal to the main power module when the main power module 100 is powered off. The main power black start unit 310 provides a first main power module start signal to the main power module 100 when the main power module 100 is in a power-off state due to a power outage caused by a fault in a grid to which the main power module 100 is connected.
The monitoring black start unit 320 is a circuit unit or device for providing a monitoring module start signal to the monitoring module 200 when the monitoring module 200 is powered off. The monitoring black start unit 320 provides a monitoring module start signal to the monitoring module 200 when the monitoring module 200 is in a power-off state due to a power failure of a power grid connected to the monitoring module 200 due to a fault. After the monitoring black start unit 320 transmits the monitoring module start signal to the monitoring module 200, the monitoring module 200 resumes operation and provides a second main power module start signal to the main power module 100.
In the present embodiment, the main power black start unit 310 provides a first main power module start signal to the main power module 100; after the monitoring black start unit 320 provides the monitoring module 200 with the monitoring module start signal, the monitoring module 200 provides the main power module 100 with a second main power module start signal; when the first main power module start signal and the second main power module start signal are simultaneously transmitted to the main power module 100, the main power module 100 satisfies a start condition and is restored from a power-off state to an operating state, thereby realizing that the electric vehicle discharges to the grid through the main power module 100 to provide energy to restore the normal operation of the grid. Therefore, the black start module 300 according to this embodiment can provide two start signals with the same or different voltage values, i.e., the first main power module start signal and the monitoring module start signal, to the main power module 100 and the monitoring module 200 respectively through the main power black start unit 310 and the monitoring black start unit 320, so that the main power module 100 and the monitoring module 200 can be restored from the power-off state to the operating state, and thus the electric vehicle can discharge to the power grid through the main power module 100 to provide energy to restore the normal operation of the power grid. Based on this, the black start module 300 in the power grid black start circuit can be applied to the situation that the starting voltages required by the main power module 100 and the monitoring module 200 are the same or different, so that the main power module 100 and the monitoring module 200 are restored to the running state from the power-off state, the application range of the power grid black start circuit is expanded, and the adaptability is high.
In one embodiment, as shown in fig. 8, the black start module 300 further includes an energy storage unit 330, and the energy storage unit 330 is connected to the main power black start unit 310 and the monitoring black start unit 320, and is used for supplying power to the main power black start unit 310 and the monitoring black start unit 320.
The energy storage unit 330 is a circuit unit and a device that stores electric energy through a medium and supplies the stored electric energy to the main power black start unit 310 and the monitoring black start unit 320. When the main power module 100 is in a power-off state due to a power failure of a power grid connected to the main power module 100, the energy storage unit 330 provides the main power black-start unit 310 and the monitoring black-start unit 320 with a voltage value V3The main power black start unit 310 and the monitoring black start unit 320 meet the operation condition to respectively provide a first main power module start signal and a monitoring module start signal to the main power module 100 and the monitoring module 200, so that the electric vehicle can discharge to the power grid through the main power module 100 to provide energy to restore the normal operation of the power grid after the main power module 100 and the monitoring module 200 restore the operation. Therefore, the main power black start unit 310 and the monitoring black start unit 320 in the black start module 300 can operate only by the power supply provided by the energy storage unit 330, and the main power black start unit 310 and the monitoring black start unit 320 do not need to be connected to the power grid or respectively provided with power supply equipment for supplying power. Based on this, the energy storage unit 330 in the embodiment related to the black start circuit of the power grid avoids the power grid from collapsing due to the faultAfter the power failure occurs, the black start module 300 cannot normally work when the main power module 100 and the monitoring module 200 are in the power failure state, so that the stability and convenience of the black start circuit of the power grid are improved, and the black start cost of the power grid is reduced.
In one embodiment, as shown in fig. 9, the energy storage unit 330 includes a storage battery 331 and a voltage regulator 332; one end of the voltage stabilizer 332 is connected to the battery 331, and the other end is connected to the main power black start unit 310 and the monitoring black start unit 320; the voltage regulator 332 may perform voltage stabilization processing on the voltage signal output from the storage battery 331 to output a first voltage signal, and output the first voltage signal to the main power black start unit 310 and the monitoring black start unit 320, respectively. In one embodiment, the voltage regulator 332 may be a voltage regulator with bidirectional voltage regulation function, or may be a circuit unit formed by other electrical components as long as the above-mentioned functions are achieved. Based on this, the energy storage unit 330 provides stable voltage signals for the main power black start unit 310 and the monitoring black start unit 320, so that the number of times of faults of the power grid black start circuit is reduced, and the stability of the power grid black start circuit is improved.
In one embodiment, as shown in fig. 10, the energy storage unit 330 further comprises a control switch 333; one end of the control switch 333 is connected with the storage battery 331, and the other end is respectively connected with the main power black start unit 310 and the monitoring black start unit 320; the control switch 333 is used to control the main power black start unit 310 and monitor the power supply state of the black start unit 320. In one embodiment, the control switch 333 may be a key switch, or may be a circuit unit formed by other electrical components as long as the above functions are realized. When the key switch is used, the condition that the operating force is met can be realized, the switch function is closed and connected by applying pressure to the switch operating direction, the switch is disconnected when the pressure is relieved, and the internal structure is switched on and off by the stress change of the metal elastic sheet. In the present embodiment, if the control switch 333 is in a closed state, the storage battery 331 supplies power to the main power black start unit 310 and the monitoring black start unit 320, so that the main power black start unit 310 and the monitoring black start unit 320 start to operate, thereby achieving the normal operation in which the main power module 100 and the monitoring module 200 are restored to an operation state from a power-off state and the electric vehicle discharges power to the grid through the main power module 100 to provide energy to restore the grid. If the control switch 333 is in the off state, the storage battery 331 cannot supply power to the main power black start unit 310 and the monitoring black start unit 320, so that the main power black start unit 310 and the monitoring black start unit 320 are in the power-off state, and thus the main power module 100 and the monitoring module 200 cannot be restored from the power-off state to the operating state and the electric vehicle discharges power to the grid through the main power module 100 to provide energy to restore the normal operation of the grid. Therefore, the control switch 333 only needs to control whether the battery 331 supplies power to the main power black start unit 310 and the monitoring black start unit 320, so as to control the whole grid black start process. Based on the method, the convenience of controlling the black start process of the power grid is improved, and the operation of controlling the black start process of the power grid is simpler.
In one embodiment, the monitoring black start unit 320 includes a first controlled switch 321; the first controlled switch 321 is connected with the voltage stabilizer 332, the control switch 333 and the monitoring module 200; the first controlled switch 321 is configured to turn on the voltage regulator 332 and the monitoring module 200 when the control switch 333 is closed, and provide the first voltage signal output by the voltage regulator 332 to the monitoring module 200 as a monitoring module start signal, so that the monitoring module 200 operates and provides the second main power module start signal to the main power module 100.
The first controlled switch 321 is a device for controlling the on/off state of the controlled circuit according to the input voltage signal. The first controlled switch 321 will obtain the output voltage signal of the battery 331 when the control switch 333 is closed, and the first controlled switch 321 is automatically closed according to the received input voltage signal. When the first controlled switch 321 is automatically closed, the voltage regulator 332 and the monitoring module 200 are in a conducting state, and the first voltage signal output by the voltage regulator 332 is provided to the monitoring module 200 as a monitoring module start signal, so that the monitoring module 200 is restored to the operating state from the power-off state and a second main power module start signal is provided to the main power module 100. In one embodiment, the first controlled switch 321 may be a relay, or may be a circuit unit formed by other electrical components as long as the above-mentioned functions can be achieved. The first contact of the relay is connected with the monitoring module 200, the second contact of the relay is connected with the voltage stabilizer 332, and the coil of the relay is connected with the control switch 333. When the control switch 333 is closed, the coil of the relay is energized, so that the first contact and the second contact of the relay are automatically attracted, and the voltage stabilizer 332 and the monitoring module 200 are in a conducting state. Therefore, the first controlled switch 321 can be automatically closed only by controlling the switch 333 to be in the closed state, so as to enable the monitoring module 200 to recover the operation state and provide the second main power module start signal to the main power module 100. Therefore, the power grid black-start circuit related in this embodiment can automatically restore the running state of the monitoring module 200 only by closing the control switch 333, thereby reducing the operation complexity of the power grid black-start circuit and reducing the cost of power grid black-start.
In one embodiment, as shown in fig. 11, the main power black start unit 310 includes a second controlled switch 311 and a booster 312. Wherein, the second controlled switch 311 is connected with the control switch 333 and the voltage regulator 332; the booster 312 has one end connected to the second controlled switch 311 and the other end connected to the main power module 100. The second controlled switch 311 may turn on the voltage regulator 332 and the voltage booster 312 when the control switch 333 is closed. The booster 312 may boost the first voltage signal output by the voltage regulator 312 to obtain a first main power module activation signal, and output the first main power module activation signal to the main power module 100.
The second controlled switch 311 is a device for controlling the on/off state of the controlled circuit according to the input voltage signal. When the control switch 333 is closed, the second controlled switch 311 obtains the voltage signal output by the battery 331, and the second controlled switch 311 is automatically closed according to the received input voltage signal. When the second controlled switch 311 is automatically closed, the voltage regulator 332 and the voltage booster 312 are in a conducting state, and the voltage booster 312 performs a voltage boosting process on the first voltage signal output by the voltage regulator 332 to obtain a first main power module start signal, and outputs the first main power module start signal to the main power module 100. Since the first controlled switch 321 can be automatically closed only by controlling the switch 333 to be in the closed state, the monitoring module 200 can recover the operation state and provide the second main power module start signal to the main power module 100. However, the second controlled switch 311 also automatically closes only by the control switch 333 being in the closed state, thereby enabling the booster 312 to output the first main power module activation signal to the main power module 100. Therefore, when the control switch 333 is closed, the first controlled switch 321 and the second controlled switch 311 are automatically closed, so that the monitoring module 200 resumes operation, and the main power module 100 resumes operation due to the first main power module start signal and the second main power module start signal being obtained simultaneously, thereby achieving normal operation of the electric vehicle for discharging energy to the grid through the main power module 100 to provide energy to resume the grid. Therefore, the power grid black-start circuit related in the embodiment can restore the normal operation of the power grid only by closing the control switch 333, so that the operation complexity of the power grid black-start circuit is reduced, and the cost of the power grid black-start is reduced.
In one embodiment, the second controlled switch 311 may be a relay, or may be a circuit unit formed by other electrical components as long as the above-described functions can be achieved. The first contact of the relay is connected with the booster 312, the second contact of the relay is connected with the voltage stabilizer 332, and the coil of the relay is connected with the control switch 333. When the control switch 333 is closed, the coil of the relay is energized, so that the first contact and the second contact of the relay are automatically attracted, and the voltage stabilizer 332 and the booster 312 are in a conducting state. In one embodiment, the main power black start unit 310 further includes a second anti-inversion unit 313; one end of the second anti-reverse unit 313 is connected with the booster 312, and the other end is connected with the main power module 100; the second anti-reverse unit 313 may prevent the current generated by the main power module 100 in the operating state from flowing back to the booster 312, causing the booster 312 to be damaged. In one embodiment, the second anti-reverse unit 313 may be a diode, an anode of the diode is connected to the booster 312, and a cathode of the diode is connected to the main power module 100; the second anti-reverse unit 313 may also be a circuit unit constituted by other electrical components as long as the above-described functions are achieved.
In one embodiment, as shown in fig. 12, the black start module 300 further includes an automatic charging unit 340; one end of the automatic charging unit 340 is connected to the main power module 100, and the other end is connected to the energy storage unit 330; the automatic charging unit is used for charging the energy storage unit 330 through the main power module 100 when the electric vehicle discharges to the grid through the main power module 100 or the grid charges to the electric vehicle through the main power module 100.
The automatic charging unit 340 is a circuit unit or a device that automatically supplies power to other devices. In one embodiment, as shown in fig. 13, the automatic charging unit 340 includes a voltage reducer 341 and a third controlled switch 342; the voltage reducer 341 is connected to the main power module 100, and may perform voltage reduction processing on the voltage signal output by the main power module 100 to obtain a second voltage signal, and transmit the second voltage signal to the energy storage unit 330; the third controlled switch 342 is connected to the voltage reducer 341 and the energy storage unit 330, and is configured to turn on the main power module 100 and the energy storage unit 330 when the electric vehicle discharges to the grid through the main power module 100 or the grid charges to the electric vehicle through the main power module 100. In one embodiment, the automatic charging unit 340 further includes a third prevention unit 343; one end of the third anti-reflection unit 343 is connected to the voltage reducer 341, and the other end is connected to the monitoring module 200, so as to prevent the current generated by the monitoring module 200 during operation from flowing back to the voltage reducer 341, and thus the voltage reducer 341 is damaged. In one embodiment, the third anti-reflection unit 343 may be a diode, an anode of the diode is connected to the voltage reducer 341, and a cathode of the diode is connected to the monitoring module 200; the third anti-reflection unit 343 may be a circuit unit formed of other electrical components as long as the above-described functions are realized.
The third controlled switch 342 is a device that controls the on/off state of the controlled circuit according to the input voltage signal. In one embodiment, the third controlled switch 342 may be a relay, or may be a circuit unit formed by other electrical components as long as the above-mentioned functions can be achieved. The first contact of the relay is connected with the energy storage unit 330, the second contact of the relay is connected with the step-down transformer 341, and the coil of the relay is connected with the step-down transformer 341. When the main power module 100 is in the operating state, the coil of the relay is energized, so that the first contact and the second contact of the relay are automatically attracted, and the voltage reducer 341 and the energy storage unit 330 are in the conducting state.
In the present embodiment, the voltage reducer 341 may perform voltage reduction processing on the voltage signal output when the main power module 100 is always in the operating state and output the second voltage signal obtained after the voltage reduction processing to the third controlled switch 342, regardless of whether the electric vehicle is discharged to the grid through the main power module 100 or the grid is charged to the electric vehicle through the main power module 100. When receiving the second voltage signal output by the voltage reducer 341, the third controlled switch 342 is automatically turned on, so that the main power module 100 and the energy storage unit 330 are in a conducting state, and the second voltage signal output by the voltage reducer 341 is provided to the energy storage unit 330 for charging. Therefore, the automatic charging unit 340 can enable the energy storage unit 330 to automatically enter the charging state in time after the black start process of the power grid, thereby avoiding the failure of the energy storage unit 330 due to power failure and failing to realize the black start process of the power grid in time. Based on this, the black start circuit of electric wire netting that this embodiment relates to need not artifical check whether energy storage unit 330 has electricity, also need not artifical operation and charge energy storage unit 330, can guarantee that energy storage unit 330 is in the electrified state and maintain the normal operating of black start circuit of electric wire netting, has reduced the operation complexity of black start circuit of electric wire netting, has improved the stability of black start circuit of electric wire netting, has reduced the cost of black start of electric wire netting.
For convenience of explanation of the present application, a specific example will be described below. As shown in fig. 14, if the power grid connected to the main power module 100 is in a normal operation state, the second ac/dc conversion unit 210 connected to the same power grid as the main power module 100 is in an operation state. The second ac/dc converting unit 210 transforms and converts the ac signal of the power grid to output a fifth dc voltage signal, and transmits the fifth dc voltage signal to the central monitoring unit 230 through the first anti-reverse unit 220. The central monitoring unit 230 is in an operating state after receiving the fifth dc voltage signal, establishes a detection voltage, i.e., a second main power module start signal, at an initialization and data interaction stage in a monitoring control timing sequence of the central monitoring unit 230, and transmits the second main power module start signal to all components in the main power module 100. The ac power distribution unit 100 receives the ac voltage signal transmitted by the power grid and the second main power module start signal, and performs distribution processing on the ac electrical signal transmitted by the power grid. The ac/dc conversion unit 120 uses the ac power signal distributed by the ac power distribution unit 110 as a power supply voltage, and transforms and ac/dc converts the distributed ac power signal to output a first dc voltage signal. When the voltage reducer in the automatic charging unit 340 receives the first dc voltage signal output by the ac-dc conversion unit 120 in the main power module 100, the voltage reducer 341 performs voltage reduction processing on the first dc voltage signal, and outputs a second voltage signal obtained after the voltage reduction processing to the third controlled switch 342. When receiving the second voltage signal output by the voltage reducer 341, the third controlled switch 342 is automatically turned on, so that the main power module 100 and the energy storage unit 330 are in a conducting state, and the second voltage signal output by the voltage reducer 341 is provided to the energy storage unit 330 for charging. Meanwhile, after it is manually confirmed that the electric vehicle needs to be charged, the dc voltage regulating unit 130 takes the first dc voltage signal output by the ac/dc converting unit 120 as a supply voltage, and regulates the first dc voltage signal to output a second dc voltage signal. The dc distribution unit 140 performs distribution processing on the second dc voltage signal, and provides the distributed dc voltage signal to the electric vehicle for charging.
If the power grid connected to the main power module 100 is in a power-off state, the main power module 100 and the monitoring module 200 connected to the same power grid as the main power module 100 are also in a power-off state, and if it is manually confirmed that the black start operation needs to be performed on the power grid, the control switch 333 is closed. When the control switch 333 is closed, the storage battery 333 supplies power to the first controlled switch 321 and the second controlled switch 311 through the control switch 333, so that the first controlled switch 321 and the second controlled switch 311 receive the input voltage signal at the same time and are automatically closed. When the first controlled switch 321 is automatically closed, the voltage regulator 332 and the monitoring module 200 are in a conducting state, and the first voltage signal output by the voltage regulator 332 is provided to the monitoring module 200 as a monitoring module start signal, so that the monitoring module 200 is restored to the operating state from the power-off state and a second main power module start signal is provided to the main power module 100. When the second controlled switch 311 is automatically closed, the voltage regulator 332 and the voltage booster 312 are in a conducting state, the voltage booster 312 performs a voltage boosting process on the first voltage signal output by the voltage regulator 332 to obtain a first main power module start signal, and outputs the first main power module start signal to the dc voltage regulating unit 130 in the main power module 100. Since the first controlled switch 321 can be automatically closed only by controlling the switch 333 to be in the closed state, the monitoring module 200 can recover the operation state and provide the second main power module start signal to all circuit units of the main power module 100. At this time, the dc voltage regulating unit 130 receives the second main power module start signal and the first main power module start signal meeting the start voltage requirement of the dc voltage regulating unit 130 at the same time, so as to recover the operation of the dc voltage regulating unit 130. Because the dc voltage regulating unit 130 resumes operation, the dc voltage regulating unit 130 may output a third dc voltage signal meeting the starting voltage condition of the ac/dc converting unit 130 to the ac/dc converting unit 130 and the voltage reducer 341 after performing dc voltage regulating processing on the dc/dc electrical signal distributed and processed by the dc distributing unit 140. The ac/dc conversion unit 130 recovers operation after receiving the third dc voltage signal, and transforms the third dc voltage signal and performs dc/ac conversion to output a fourth dc voltage signal. After receiving the fourth dc voltage signal output by the ac/dc conversion unit 130, the ac power distribution unit 110 performs distribution processing on the fourth dc voltage signal, and provides the distributed dc voltage signal to the power grid to implement discharging of the electric vehicle and recovery operation of the power grid. Meanwhile, since the dc voltage regulating unit 130 resumes operation, the voltage reducer 341 performs voltage reduction processing on the third dc voltage signal after receiving the third dc voltage signal output by the dc voltage regulating unit 130, and outputs a second voltage signal obtained after the voltage reduction processing to the third controlled switch 342. When receiving the second voltage signal output by the voltage reducer 341, the third controlled switch 342 is automatically turned on, so that the dc voltage regulating unit 130 in the main power module 100 and the storage battery 331 in the energy storage unit 330 are in a conducting state, thereby supplying the second voltage signal output by the voltage reducer 341 to the storage battery 331 for charging.
In an embodiment, the present application further provides a charging and discharging pile, where the charging and discharging pile includes the black-start circuit of the power grid in each of the above embodiments.
In the description herein, references to the description of "some embodiments," "other embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A black start circuit for a power grid, comprising:
the main power module is used for connecting a power grid and an electric vehicle and carrying out charging or discharging treatment on the electric vehicle;
the monitoring module is connected with the main power module and is used for monitoring the main power module;
and the black start module is respectively connected with the main power module and the monitoring module and used for providing a start signal for the main power module and the monitoring module when the main power module and the monitoring module are powered off, so that the electric vehicle discharges to the power grid through the main power module to provide energy.
2. The power grid black start circuit according to claim 1, wherein the black start module comprises:
the main power black start unit is connected with the main power module and used for providing a first main power module start signal for the main power module when the main power module is powered off;
and the monitoring black start unit is connected with the monitoring module and used for providing a monitoring module start signal for the monitoring module when the monitoring module is powered off, so that the monitoring module operates and provides a second main power module start signal for the main power module.
3. The power grid black start circuit of claim 2, wherein the black start module further comprises:
and the energy storage unit is connected with the main power black start unit and the monitoring black start unit and is used for providing power for the main power black start unit and the monitoring black start unit.
4. The black start circuit of claim 3, wherein the energy storage unit comprises: a storage battery and a voltage stabilizer; one end of the voltage stabilizer is connected with the storage battery, the other end of the voltage stabilizer is connected with the main power black start unit and the monitoring black start unit, and the voltage stabilizer is used for stabilizing the voltage signal output by the storage battery to obtain a first voltage signal and outputting the first voltage signal to the main power black start unit and the monitoring black start unit respectively.
5. The black start circuit of claim 4, wherein the energy storage unit further comprises:
and one end of the control switch is connected with the storage battery, and the other end of the control switch is respectively connected with the main power black start unit and the monitoring black start unit and is used for controlling the power supply states of the main power black start unit and the monitoring black start unit.
6. The black start circuit of claim 5, wherein the monitoring black start unit comprises:
the first controlled switch is connected with the voltage stabilizer, the control switch and the monitoring module and used for conducting the voltage stabilizer and the monitoring module when the control switch is closed, the first voltage signal output by the voltage stabilizer is used as a monitoring module starting signal to be provided for the monitoring module, so that the monitoring module operates and provides the second main power module starting signal for the main power module.
7. The grid black start circuit according to claim 5, wherein the main power black start unit comprises: a second controlled switch and a booster; the second controlled switch is connected with the control switch and the voltage stabilizer, and the booster is connected with the second controlled switch and the main power module;
the second controlled switch is used for conducting the voltage stabilizer and the voltage booster when the control switch is closed;
the booster is used for boosting the first voltage signal output by the voltage stabilizer to obtain a first main power module starting signal and outputting the first main power module starting signal to the main power module.
8. The power grid black start circuit of claim 3, wherein the black start module further comprises:
and the automatic charging unit is connected with the main power module and the energy storage unit and is used for charging the energy storage unit through the main power module when the electric vehicle discharges to the power grid through the main power module or the power grid charges to the electric vehicle through the main power module.
9. The black start circuit of claim 8, wherein the automatic charging unit comprises:
the voltage reducer is connected with the main power module and used for reducing the voltage of the voltage signal output by the main power module to obtain a second voltage signal and transmitting the second voltage signal to the energy storage unit;
and the third controlled switch is connected with the voltage reducer and the energy storage unit and used for conducting the main power module and the energy storage unit when the electric vehicle discharges to the power grid through the main power module or the power grid charges to the electric vehicle through the main power module.
10. Charging and discharging pile, characterized in that it comprises a black start circuit for an electrical network according to any one of claims 1 to 9.
CN202011318938.XA 2020-11-23 2020-11-23 Black start circuit of electric wire netting and charge-discharge stake Active CN112542851B (en)

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