CN111244996A - Energy storage grid-connected control system and control method - Google Patents

Energy storage grid-connected control system and control method Download PDF

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Publication number
CN111244996A
CN111244996A CN202010210876.4A CN202010210876A CN111244996A CN 111244996 A CN111244996 A CN 111244996A CN 202010210876 A CN202010210876 A CN 202010210876A CN 111244996 A CN111244996 A CN 111244996A
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power
pcs
energy storage
detection device
grid
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CN111244996B (en
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张育华
张东升
樊苗
福尔康
简增丰
于浩
高建强
马娟维
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Beijing Shoto Energy Storage Technology Co ltd
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Beijing Shoto Energy Storage Technology Co ltd
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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
    • H02J3/28—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
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • 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
    • 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
    • Y04S10/14—Energy storage units
    • 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
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application provides an energy storage grid-connected control system and a control method, wherein the energy storage grid-connected control system comprises a monitoring workstation, a BMS, a PCS, a transformer protection device, a ring main unit protection device, a load detection device, an electric energy quality detection device, a reverse power detection device and a switch, wherein the BMS, the PCS, the transformer protection device, the ring main unit protection device, the load detection device, the electric energy quality detection device, the reverse power detection device and the switch are; the BMS is used for acquiring the information of the battery pack; the monitoring workstation acquires data information of PCS operation through the switch; the transformer protection device is used for acquiring the winding temperature of the transformer; the load detection device is used for detecting the current and voltage information of the main cabinet of each branch distribution substation and counting the electricity consumption and the electricity power of the load; the power quality detection device is used for detecting the power quality, three-phase voltage, three-phase current and power and voltage harmonic in the alternating current circuit; the reverse power detection device is used for detecting current and voltage information of the inlet line main cabinet; and a digital PID control module is arranged in the monitoring workstation and used for controlling the output power of the PCS.

Description

Energy storage grid-connected control system and control method
Technical Field
The application belongs to the technical field of energy storage, and particularly relates to an energy storage grid-connected control system and a control method.
Background
The energy storage power station system is a system which uses an electrochemical battery for electric energy storage and can be operated in parallel with a municipal power grid. The application of high-capacity battery energy storage in an electric power system has been over 20 years, and with the rapid development of new energy industries such as wind power, photovoltaic and the like, the high-capacity energy storage industry is developing rapidly. After the electric energy storage system is introduced into the electric power system, the stability of the electric power system can be improved, the electric power system can be used as a new means for adjusting frequency and power compensation, improving electric energy quality, compensating load fluctuation and shifting peaks and valleys, the management capability of an electric power demand side is improved, the utilization mode of electric power equipment is expanded, the application of renewable energy sources is promoted, and the like.
At present, the energy storage system is enlarged more and more, and the energy storage power stations are increased more and more. According to the use condition, some energy storage systems are additionally provided with a step-up transformer on the alternating current side, and the voltage is boosted to 10KV and then is connected to the grid. However, some power supply companies have clear requirements, the clear text rules do not allow the energy storage system to transmit power to the power grid, a reverse power detection device needs to be installed at a gateway, and a power quality monitoring device needs to be installed at a grid-connected point. This places more restrictive demands on the range of use of the energy storage plant.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the application provides an energy storage grid-connected control system and a control method.
According to a first aspect of an embodiment of the present application, the present application provides an energy storage grid-connected control system, which includes a monitoring workstation, a BMS, a PCS, a transformer protection device, a ring main unit protection device, a load detection device, an electric energy quality detection device, a reverse power detection device, and a switch;
the BMS, the PCS, the transformer protection device, the ring main unit protection device, the load detection device, the power quality detection device and the reverse power detection device are communicated with the monitoring workstation through the switch;
the BMS is used for acquiring information of the battery pack and sending the information to the monitoring workstation through the switch; if the battery pack is in overvoltage, undervoltage, overcurrent or the temperature of the single battery is higher than a preset temperature threshold value in the running process, the monitoring workstation controls a direct current breaker in the BMS to break a direct current loop through the switch;
the PCS is used for converting direct current into alternating current or converting alternating current into direct current, and the monitoring workstation acquires data information of the PCS operation through the exchanger; the monitoring workstation controls the PCS to increase or decrease the charge and discharge power according to the data information of the PCS operation;
the transformer protection device is used for acquiring the winding temperature of the transformer and sending the winding temperature to the monitoring workstation through the switch; if the monitoring workstation judges that an overvoltage, undervoltage or overcurrent fault occurs in the high-voltage ring main unit, the monitoring workstation controls and breaks a vacuum circuit breaker in the open-loop high-voltage ring main unit;
the load detection device is used for detecting the current and voltage information of the main cabinet of each branch distribution substation, counting the power consumption and the power consumption of the load and sending the power consumption and the power consumption to the monitoring workstation through the switch;
the power quality detection device is used for detecting the power quality, three-phase voltage, three-phase current and power and voltage harmonic in the alternating current circuit; when the power quality detection device detects that harmonic waves or distortion in the alternating current circuit exceeds a preset value, alarm information is sent out and sent to the monitoring workstation through the switch;
the reverse power detection device is used for detecting current and voltage information of the inlet line main cabinet and sending the current and voltage information to the monitoring workstation through the switch; if the monitoring workstation judges that the reverse power of the incoming line main cabinet is greater than or equal to the reverse power alarm value, controlling the PCS to reduce the discharge power; if the reduced power of the PCS is not responded in the preset time or the load change of the user side is larger than or equal to the preset value, when the reverse power detection device detects that the reverse power reaches a protection value, the monitoring workstation controls to directly trip off a vacuum circuit breaker in the ring main unit.
In the energy storage grid-connected control system, the information of the battery pack comprises the voltage, the temperature and the SOC value of the single battery, and the voltage, the running current and the SOC value of the battery pack.
In the energy storage grid-connected control system, the data information of the PCS operation comprises the charging and discharging voltage and current of the battery pack and the device temperature of the PCS.
In the energy storage grid-connected control system, the electric quantity information of the high-voltage ring main unit comprises three-phase voltage, three-phase current and running power of the high-voltage ring main unit.
In the energy storage grid-connected control system, energy management configuration software is arranged in the monitoring workstation, and a digital PID control module is arranged in the energy management configuration software; the digital PID control module is used for adjusting the output power of the PCS.
Further, when the load power of the user side is greater than or equal to the rated power of the energy storage system, the load power P of the user side detected by the load detection device is detectedfAs power set point P of grid connection pointpcc_SETThe digital PID control module utilizes the load power P of the user sidefAdjusting the output power of the PCS.
Further, when the load power of the user side is smaller than the rated power of the energy storage system, the input of the digital PID control module is a grid-connected point constant power control error Err：Err＝Ppcc_SET-Ppcc；
Wherein, Ppcc_SETRepresenting a power given value of a grid connection point; ppccEntities representing grid-connected pointsAnd the time power is detected by the power quality detection device.
Furthermore, the digital PID control module utilizes the constant power control error E of the grid-connected pointrrCalculating power given value P of PCSbAnd using the given power value P of the calculation PCSbAdjusting the output power of the PCS;
power set-point value P of PCSbComprises the following steps:
Pb＝Pb1+KP*(Err-Err1)+Ki*Err；
in the formula, Pb1Power setpoint representing the PCS of the previous control period, Err1Representing the constant power control error of the grid-connected point in the previous control period, KPDenotes the proportionality coefficient, KiRepresenting the integral coefficient.
The energy storage grid-connected control system further comprises a server, and each monitoring workstation is communicated with the server through the Ethernet.
According to a second aspect of the embodiments of the present application, the present application further provides an energy storage grid-connected control method, which includes the following steps:
obtaining load power P of user sidef；
Judging the load power P of the user sidefWhether the output power of the energy storage system is greater than or equal to;
if the load power P of the user sidefIf the output power of the energy storage system is larger than or equal to the output power of the energy storage system, the load power P of the user side is converted into the load powerfAs power set point P of grid connection pointpcc_SETAnd using the load power P of the user sidefAdjusting the output power of the PCS;
if the load power P of the user sidefIf the output power is less than the output power of the energy storage system, calculating the power set value P of the PCS by utilizing a PID control algorithmbAnd using the power setpoint P of PCSbThe output power of the PCS is adjusted by combining the reverse power of the inlet wire main cabinet;
wherein, the power given value P of PCSbComprises the following steps:
Pb＝Pb1+KP*(Err-Err1)+Ki*Err；
in the formula, Pb1Power setpoint, E, representing the last control period PCS3rr1Representing the constant power control error of the grid-connected point in the previous control period, KPDenotes the proportionality coefficient, KiRepresents an integral coefficient; errRepresenting the constant power control error of the grid-connected point in the current control period, Err＝Ppcc_SET-PpccGiven value of power of grid-connected point Ppcc_SETRated power for PCS
According to the above embodiments of the present application, at least the following advantages are obtained: the method comprises the steps of setting energy management configuration software in a monitoring workstation, setting a digital PID control module in the energy management configuration software, and setting a power given value P of a grid-connected pointpcc_SETReal-time power P with point of connectionpccThe difference value of the power control module is used as the input quantity of a digital PID control module, and a PID control algorithm is adopted to calculate the power given value P of the PCSbAnd using the power setpoint P of PCSbThe output power of the energy storage converter is adjusted by combining the reverse power of the incoming line main cabinet, so that the output power of the PCS is matched with the load power of the user side, the alternating current side grid connection is realized, and the condition of reverse power grid connection is ensured not to occur. According to the method and the device, the operation of the energy storage system can be automatically adjusted under the condition of strictly executing relevant power regulations and requirements, and the efficiency of the energy storage system is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the scope of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification of the application, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic view of an application example of an energy storage grid-connected control system according to an embodiment of the present application.
Fig. 2 is a communication topology diagram of an energy storage grid-connected control system according to an embodiment of the present disclosure.
Fig. 3 is a control schematic diagram of a monitoring workstation in an energy storage grid-connected control system according to an embodiment of the present application.
Fig. 4 is a flowchart of an energy storage grid connection control method according to an embodiment of the present application.
Description of reference numerals:
1. a monitoring workstation; 2. a BMS; 3. PCS; 4. a transformer protection device; 5. a ring main unit protection device; 6. a load detection device; 7. a power quality detection device; 8. a reverse power detection device; 9. a switch; 10. and (4) a server.
Detailed Description
For the purpose of promoting a clear understanding of the objects, aspects and advantages of the embodiments of the present application, reference will now be made to the accompanying drawings and detailed description, wherein like reference numerals refer to like elements throughout.
The illustrative embodiments and descriptions of the present application are provided to explain the present application and not to limit the present application. Additionally, the same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.
As used herein, "first," "second," …, etc., are not specifically intended to mean in a sequential or chronological order, nor are they intended to limit the application, but merely to distinguish between elements or operations described in the same technical language.
With respect to directional terminology used herein, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be illustrative and is not intended to be limiting of the present teachings.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
As used herein, "and/or" includes any and all combinations of the described items.
References to "plurality" herein include "two" and "more than two"; reference to "multiple sets" herein includes "two sets" and "more than two sets".
As used herein, the terms "substantially", "about" and the like are used to modify any slight variation in quantity or error that does not alter the nature of the variation. In general, the range of slight variations or errors that such terms modify may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. It should be understood by those skilled in the art that the aforementioned values can be adjusted according to actual needs, and are not limited thereto.
Certain words used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present application.
Fig. 1 is a schematic view of an application example of an energy storage grid-connected control system according to an embodiment of the present application. Fig. 2 is a communication topology diagram of an energy storage grid-connected control system according to an embodiment of the present disclosure.
As shown in fig. 1 and fig. 2, the energy storage grid-connected control System provided in the embodiment of the present application includes a monitoring workstation 1, a BMS2(Battery Management System), a PCS3(Power Conversion System), a transformer protection device 4, a ring main unit protection device 5, a load detection device 6, an electric energy quality detection device 7, a reverse Power detection device 8, and an exchange 9. Wherein, the monitoring workstation 1 is provided with energy management configuration software. BMS2, PCS3, transformer protection device 4, ring main unit protection device 5, load detection device 6, power quality detection device 7 and reverse power detection device 8 all communicate with monitoring workstation 1 through switch 9.
Among them, the BMS2 is used to acquire information of the battery pack and transmit the acquired information of the battery pack to the monitoring workstation 1 through the exchange 9. The information of the battery pack specifically includes a voltage, a temperature, and a SOC (State of Charge) value of the unit battery, and a voltage, an operation current, and a SOC value of the battery pack.
When the battery pack has faults such as overvoltage, undervoltage, overcurrent or temperature higher than a preset temperature threshold value during operation, the monitoring workstation 1 can control a direct current breaker in the BMS2 to break a direct current loop through the switch 9.
PCS3 is used to convert direct current to alternating current or alternating current to direct current. The monitoring station 1 communicates with the PCS3 through the switch 9 to obtain data information on the operation of the PCS 3. Data information of the PCS3 operation includes voltage, current of battery pack charging and discharging, device temperature of PCS3, and the like. The monitoring station 1 adjusts the operating power of the PCS3 based on the state of the battery and the user side load.
For example, if monitoring station 1 determines that the battery is about to be fully charged, control PCS3 to reduce the charging power; if the monitoring workstation 1 judges that the load of the user side is less than or equal to a preset first load threshold value, controlling the PCS3 to increase the charging power; if the monitoring workstation 1 judges that the load of the user side is greater than or equal to the preset second load threshold value, controlling the PCS3 to reduce the charging power or controlling the battery pack to discharge to meet the load of the user side; if the monitoring workstation 1 judges that the PCS3 has faults of overcurrent, overvoltage, undervoltage, temperature higher than a preset temperature threshold value and the like, the PCS3 is controlled to stop running, and accidents are avoided.
The transformer protection device 4 is used for acquiring the winding temperature of the transformer and sending the winding temperature to the monitoring workstation 1 through the switch 9. And if the monitoring workstation 1 judges that the winding temperature of the transformer is greater than or equal to the preset winding temperature threshold value, controlling a vacuum circuit breaker in a high-voltage ring main unit connected with the transformer to trip.
The ring main unit protection device 5 is used for acquiring electric quantity information of the high-voltage ring main unit and sending the electric quantity information to the monitoring workstation 1 through the switch 9. The electric quantity information of the high-voltage ring main unit comprises three-phase voltage, three-phase current, running power and the like of the high-voltage ring main unit.
If the monitoring workstation 1 judges that an overvoltage, undervoltage or overcurrent fault occurs in the high-voltage ring main unit, the monitoring workstation 1 controls the vacuum circuit breaker in the ring disconnection high-voltage ring main unit to acquire fault information.
When the high-voltage ring main unit selects the automatic mode, the on-off of the vacuum circuit breaker can be controlled by the monitoring workstation 1; when the high-voltage ring main unit selects the on-site mode, the switching-on and switching-off of the vacuum circuit breaker can be manually controlled on the ring main unit.
The load detection device 6 is used for detecting the current and voltage information of the main cabinet of each branch distribution substation, counting the electricity consumption and the electricity power of the load, and sending the electricity consumption and the electricity power to the monitoring workstation 1 through the switchboard 9.
The power quality detection device 7 is used for detecting the power quality, three-phase voltage, three-phase current and power, voltage harmonic waves and the like in the alternating current circuit. When the power quality detection device 7 detects that harmonic waves or distortion in the alternating current circuit exceed a preset value, alarm information can be sent out, and the alarm information is sent to the monitoring workstation 1 through the switch 9.
The reverse power detection device 8 is used for detecting the current and voltage information of the inlet line main cabinet and sending the information to the monitoring workstation 1 through the switch 9. If the monitoring workstation 1 judges that the reverse power of the inlet line main cabinet is greater than or equal to the reverse power alarm value, the PCS3 is controlled to reduce the discharge power; if the power reduction of the PCS3 does not respond within the preset time or the load change of the user side is greater than or equal to the preset value, when the reverse power detection device 8 detects that the reverse power reaches the protection value, the monitoring workstation 1 controls the vacuum circuit breaker in the ring main unit to be directly tripped.
Fig. 3 is a control schematic diagram of a monitoring workstation in an energy storage grid-connected control system according to an embodiment of the present application.
As shown in fig. 3, the digital PID control module is provided by the energy management configuration software in the monitoring workstation 1. The load detection device 6 detects the power consumption in the same inlet wire main cabinet in real time, and the power consumption of a user is dynamically changed. When the energy storage system discharges, the load detection device 6 detects that the load power at the user side is Pf。
The real-time power of the grid-connected point detected by the power quality detection device 7 is Ppcc. Setting the power of the grid-connected point to a given value Ppcc_SETReal-time power P with point of connectionpccThe difference value of (A) is used as the constant power control error of the grid-connected pointDifference ErrNamely: err＝Ppcc_SET-Ppcc。
When the load power of the user side is larger than or equal to the rated power of the energy storage system, the load power P of the user side detected by the load detection device 6 is detectedfAs power set point P of grid connection pointpcc_SETUsing the load power P of the user sidefThe output power of PCS3 is regulated.
When the load power of the user side is smaller than the rated power of the energy storage system, the constant power control error E of the grid-connected point is determinedrrInputting a digital PID control module to calculate the power given value P of the PCS3bNamely:
Pb＝Pb1+KP*(Err-Err1)+Ki*Err；
in the formula, Pb1Power setpoint, E, representing the last control period PCS3rr1Representing the constant power control error of the grid-connected point in the previous control period, KPDenotes the proportionality coefficient, KiRepresents an integral coefficient; errRepresenting the constant power control error of the grid-connected point in the current control period, Err＝Ppcc_SET-PpccGiven value of power of grid-connected point Ppcc_SETI.e., the power rating of PCS 3. The digital PID control module utilizes the power given value P of PCS3 obtained by calculationbThe output power of PCS3 is regulated.
For example, the load detection device 6 detects that the power consumption of the user is 500KW, and the monitoring workstation 1 controls the output power of the PCS3 to be 500 KW; when the power consumption of a user is reduced to 400KW, the digital PID control module responds to and controls the output power of the PCS3 to be reduced to 400KW according to a PID control algorithm; when the power consumption of a user is increased to 500KW, the output power of the PCS3 controlled by the digital PID control module is also increased to 500KW, so that the reverse power of the power grid can be avoided. Wherein, the power consumption of the user is the load power of the user side.
The energy storage grid-connected control system provided by the embodiment of the application is further provided with a server 10, and each monitoring workstation 1 is communicated with the server 10 through the Ethernet, so that the server 10 can manage each monitoring workstation 1 conveniently.
The energy storage grid-connected control system provided by the embodiment of the application arranges energy management configuration software in the monitoring workstation, arranges a digital PID control module in the energy management configuration software, and sets the power given value P of a grid-connected pointpcc_SETReal-time power P with point of connectionpccThe difference value of the power control module is used as the input quantity of a digital PID control module, and a PID control algorithm is adopted to calculate the power given value P of the PCS3bAnd using the power given value P of PCS3bThe output power of the energy storage converter is adjusted by combining the reverse power of the incoming line main cabinet, so that the output power of the PCS is matched with the load power of the user side, the alternating current side grid connection is realized, and the condition of reverse power grid connection is ensured not to occur.
Fig. 4 is a flowchart of an energy storage grid connection control method according to an embodiment of the present application.
As shown in fig. 4, based on the energy storage grid-connected control system provided in the embodiment of the present application, the present application further provides an energy storage grid-connected control method, which includes the following steps:
s1, obtaining load power P of user sidef。
S2, judging the load power P of the user sidefWhether greater than or equal to the output power of the energy storage system.
S3, if the load power P of user sidefIf the output power of the energy storage system is greater than or equal to the output power of the energy storage system, the load power P of the user side detected by the load detection device 6 is detectedfAs power set point P of grid connection pointpcc_SETAnd using the load power P of the user sidefThe output power of PCS3 is regulated.
S4, if the load power P of user sidefIf the output power of the energy storage system is less than the output power of the energy storage system, the given power value P of the PCS3 is calculated by using a PID control algorithmbAnd using the calculated power set point P of PCS3bThe output power of PCS3 is regulated in conjunction with the reverse power of the incoming line head box.
Power setpoint P for PCS3bComprises the following steps:
Pb＝Pb1+KP*(Err-Err1)+Ki*Err；
in the formula, Pb1Power setpoint, E, representing the last control period PCS3rr1Representing the constant power control error of the grid-connected point in the previous control period, KPDenotes the proportionality coefficient, KiRepresents an integral coefficient; errRepresenting the constant power control error of the grid-connected point in the current control period, Err＝Ppcc_SET-PpccGiven value of power of grid-connected point Ppcc_SETIs the power rating of PCS 3.
The energy storage grid-connected control method provided by the embodiment of the application compares the load power P of the user sidefWith the output power of the energy storage system, as the load power P of the user sidefWhen the output power of the energy storage system is less than the output power of the energy storage system, the power given value P of the grid-connected point is setpcc_SETReal-time power P with point of connectionpccThe difference value of the power control error is used as a constant power control error of a grid-connected point, and a PID control algorithm is adopted to calculate a power given value P of the PCS3bAnd using the power given value P of PCS3bThe output power of the energy storage converter is adjusted by combining the reverse power of the incoming line main cabinet, so that the output power of the PCS is matched with the load power of the user side, the alternating current side grid connection is realized, and the condition of reverse power grid connection is ensured not to occur. According to the method and the device, the operation of the energy storage system can be automatically adjusted under the condition of strictly executing relevant power regulations and requirements, and the efficiency of the energy storage system is improved.
In an exemplary embodiment, the present application further provides a computer storage medium, which is a computer readable storage medium, for example, a memory including a computer program, where the computer program is executable by a processor to perform the steps in the foregoing energy storage grid connection control method.
The embodiments of the present application described above may be implemented in various hardware, software code, or a combination of both. For example, the embodiments of the present application may also be program code for executing the above-described method in a data signal processor. The present application may also relate to various functions performed by a computer processor, digital signal processor, microprocessor, or field programmable gate array. The processor described above may be configured in accordance with the present application to perform certain tasks by executing machine-readable software code or firmware code that defines certain methods disclosed herein. Software code or firmware code may be developed in different programming languages and in different formats or forms. Software code may also be compiled for different target platforms. However, different code styles, types, and languages of software code and other types of configuration code for performing tasks according to the present application do not depart from the spirit and scope of the present application.
The foregoing is merely an illustrative embodiment of the present application, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present application shall fall within the protection scope of the present application.

Claims (10)

1. An energy storage grid-connected control system is characterized by comprising a monitoring workstation, a BMS, a PCS, a transformer protection device, a ring main unit protection device, a load detection device, an electric energy quality detection device, a reverse power detection device and a switch;
the BMS, the PCS, the transformer protection device, the ring main unit protection device, the load detection device, the power quality detection device and the reverse power detection device are communicated with the monitoring workstation through the switch;
the BMS is used for acquiring information of the battery pack and sending the information to the monitoring workstation through the switch; if the battery pack is in overvoltage, undervoltage, overcurrent or the temperature of the single battery is higher than a preset temperature threshold value in the running process, the monitoring workstation controls a direct current breaker in the BMS to break a direct current loop through the switch;
the PCS is used for converting direct current into alternating current or converting alternating current into direct current, and the monitoring workstation acquires data information of the PCS operation through the exchanger; the monitoring workstation controls the PCS to increase or decrease the charge and discharge power according to the data information of the PCS operation;
the transformer protection device is used for acquiring the winding temperature of the transformer and sending the winding temperature to the monitoring workstation through the switch; if the monitoring workstation judges that an overvoltage, undervoltage or overcurrent fault occurs in the high-voltage ring main unit, the monitoring workstation controls and breaks a vacuum circuit breaker in the open-loop high-voltage ring main unit;
the load detection device is used for detecting the current and voltage information of the main cabinet of each branch distribution substation, counting the power consumption and the power consumption of the load and sending the power consumption and the power consumption to the monitoring workstation through the switch;
the power quality detection device is used for detecting the power quality, three-phase voltage, three-phase current and power and voltage harmonic in the alternating current circuit; when the power quality detection device detects that harmonic waves or distortion in the alternating current circuit exceeds a preset value, alarm information is sent out and sent to the monitoring workstation through the switch;
the reverse power detection device is used for detecting current and voltage information of the inlet line main cabinet and sending the current and voltage information to the monitoring workstation through the switch; if the monitoring workstation judges that the reverse power of the incoming line main cabinet is greater than or equal to the reverse power alarm value, controlling the PCS to reduce the discharge power; if the reduced power of the PCS is not responded in the preset time or the load change of the user side is larger than or equal to the preset value, when the reverse power detection device detects that the reverse power reaches a protection value, the monitoring workstation controls to directly trip off a vacuum circuit breaker in the ring main unit.
2. The energy storage grid-connection control system according to claim 1, wherein the information of the battery pack comprises the voltage, the temperature and the SOC value of the single battery, and the voltage, the running current and the SOC value of the battery pack.
3. The energy storage grid-connected control system according to claim 1, wherein the data information of the PCS operation comprises voltage and current for charging and discharging the battery pack, and device temperature of the PCS.
4. The energy storage grid-connected control system according to claim 1, wherein the electric quantity information of the high-voltage ring main unit comprises three-phase voltage, three-phase current and running power of the high-voltage ring main unit.
5. The energy storage grid-connected control system according to claim 1, 2, 3 or 4, wherein energy management configuration software is arranged in the monitoring workstation, and a digital PID control module is arranged in the energy management configuration software; the digital PID control module is used for adjusting the output power of the PCS.
6. The energy storage grid-connected control system according to claim 5, wherein when the load power of the user side is greater than or equal to the rated power of the energy storage system, the load power P of the user side detected by the load detection device is detectedfAs power set point P of grid connection pointpcc_SETThe digital PID control module utilizes the load power P of the user sidefAdjusting the output power of the PCS.
7. The energy storage grid-connected control system according to claim 5, wherein when the load power of the user side is smaller than the rated power of the energy storage system, the input of the digital PID control module is a grid-connected point constant power control error Err：Err＝Ppcc_SET-Ppcc；
Wherein, Ppcc_SETRepresenting a power given value of a grid connection point; ppccAnd the real-time power of the grid-connected point is detected by the power quality detection device.
8. The energy storage grid-connected control system according to claim 7, wherein the digital PID control module utilizes a grid-connected point constant power control error ErrCalculating power given value P of PCSbAnd using the given power value P of the calculation PCSbAdjusting the output power of the PCS;
power set-point value P of PCSbComprises the following steps:
Pb＝Pb1+KP*(Err-Err1)+Ki*Err；
in the formula, Pb1To representPower setpoint of PCS of the last control period, Err1Representing the constant power control error of the grid-connected point in the previous control period, KPDenotes the proportionality coefficient, KiRepresenting the integral coefficient.
9. The energy storage grid-connected control system according to claim 1, 2, 3 or 4, further comprising a server, wherein each monitoring workstation communicates with the server through an Ethernet.
10. An energy storage grid-connected control method is characterized by comprising the following steps:
obtaining load power P of user sidef；
Judging the load power P of the user sidefWhether the output power of the energy storage system is greater than or equal to;
if the load power P of the user sidefIf the output power of the energy storage system is larger than or equal to the output power of the energy storage system, the load power P of the user side is converted into the load powerfAs power set point P of grid connection pointpcc_SETAnd using the load power P of the user sidefAdjusting the output power of the PCS;
if the load power P of the user sidefIf the output power is less than the output power of the energy storage system, calculating the power set value P of the PCS by utilizing a PID control algorithmbAnd using the power setpoint P of PCSbThe output power of the PCS is adjusted by combining the reverse power of the inlet wire main cabinet;
wherein, the power given value P of PCSbComprises the following steps:
Pb＝Pb1+KP*(Err-Err1)+Ki*Err；
in the formula, Pb1Power setpoint, E, representing the last control period PCS3rr1Representing the constant power control error of the grid-connected point in the previous control period, KPDenotes the proportionality coefficient, KiRepresents an integral coefficient; errRepresenting the constant power control error of the grid-connected point in the current control period, Err＝Ppcc_SET-PpccGiven value of power of grid-connected point Ppcc_SETRated work for PCSAnd (4) rate.
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