Debugging method and system for battery energy storage system in optical storage off-grid microgrid, terminal and storage medium
By adopting the debugging method of black start testing and virtual synchronous generator mode in optical storage off-grid microgrid, the problem of temporary debugging power dependence is solved, and faster debugging progress and lower costs are achieved.
Patent Information
- Application Number
- CN202411644803.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-03-04
AI Technical Summary
The debugging process of the battery energy storage system in the existing optical storage off-grid microgrid relies on temporary debugging power supply, resulting in long debugging time and high rental costs, which affects the debugging progress and increases costs.
Provide a debugging method, including black start testing preparation program, debugging the energy storage sub-array using high-voltage temporary debugging power supply, black start building the network after completing the energy storage sub-array debugging, exiting the high-voltage temporary debugging power supply, cold debugging of the photovoltaic sub-array, charging and debugging other energy storage sub-arrays until the battery calibration and activation of all energy storage sub-arrays is completed.
By no longer relying on high-voltage temporary debugging power, the debugging construction period is shortened, the rental cost is reduced, the debugging efficiency is improved, and the design principle is reliable, the structure is simple, and there is a wide range of application prospects.
Smart Images
Figure CN119561232A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of microgrids, and in particular relates to a debugging method, system, terminal and storage medium for a battery energy storage system in an off-grid photovoltaic storage microgrid. Background Art
[0002] In the power system, there are two common microgrid modes, namely grid-connected microgrid and off-grid microgrid. A grid-connected microgrid refers to a power system connected to the public power grid. It can use both self-generated electricity and obtain electricity from the public power grid. An off-grid microgrid refers to a power system that operates independently of the public power grid, that is, it is not connected to the large-scale power grid. This system relies entirely on self-sufficient power sources and stores excess power through batteries for use when needed. Off-grid microgrids are suitable for remote areas that are not connected to the public power grid, such as rural areas, mountainous areas and islands, or as emergency backup power sources.
[0003] At present, for new energy microgrid projects such as photovoltaic energy storage at home and abroad, they are basically grid-connected microgrids. Before debugging, it is only necessary to use the external power grid to supply power to the microgrid system before debugging can start, and the debugging method is very mature. For the debugging of large-capacity off-grid new energy microgrid projects, since there is no external grid power supply in the early stage, it is necessary to prepare a temporary debugging test power supply in advance, and always use the temporary debugging power supply during the debugging process to complete the debugging of all battery energy storage systems. However, due to the limited capacity and unreliability of the temporary test power supply, the debugging process of the battery energy storage system will be relatively long, and the debugging rental fee is very high, which greatly affects the debugging progress and also increases the debugging cost. Summary of the invention
[0004] In view of the fact that the debugging process of the battery energy storage system in the photovoltaic off-grid microgrid in the prior art always uses a temporary debugging power supply, the existing debugging process is relatively long, and the debugging rental fee is very high, which greatly affects the debugging progress and also increases the debugging cost. The present invention provides a debugging method, system, terminal and storage medium for the battery energy storage system in the photovoltaic off-grid microgrid to solve the above technical problems.
[0005] In a first aspect, the present invention provides a method for debugging a battery energy storage system in a photovoltaic off-grid microgrid, comprising: S1. Perform black start test preparatory procedures; S2. Use a high-voltage temporary debugging power supply to debug the two energy storage sub-arrays; S3: After the debugging of the two energy storage sub-arrays is completed, a black start is performed to establish a network based on the two debugged energy storage sub-arrays; S4, exit the high voltage temporary debugging power supply; S5. Perform cold commissioning on one photovoltaic sub-array PV; S6. Use the debugged photovoltaic sub-array PV to charge the debugged energy storage sub-array, and keep the power of the energy storage sub-array within a preset range; S7, using two energy storage sub-arrays to debug other undebugged energy storage sub-arrays; S8. During the debugging process, if the power of a certain energy storage subarray is lower than a preset range, execute step S6; S9, completing the debugging of the third and fourth energy storage subarrays; S10, incorporating the debugged third and fourth energy storage subarrays into the power grid established in step S3 in a virtual synchronous generator (VSG) mode; S11, performing n rounds of charge and discharge tests between the four energy storage sub-arrays connected to the grid to complete battery calibration and activation of the energy storage sub-arrays in the grid; S12, operate the four energy storage sub-arrays in the power grid in the virtual synchronous generator (VSG) mode, perform n rounds of charge and discharge tests on the next energy storage sub-array, and complete battery calibration and activation of the next energy storage sub-array; S13, repeat step S11 until the battery calibration and activation of all energy storage sub-arrays are completed and the entire station officially supplies power to the outside.
[0006] Furthermore, the black start test preparation procedure includes: Disconnect the high-voltage side of the transformer at the smart transformer station STS, connect the smart subarray control unit SACU, and send a black start command. Check and confirm that the high and low voltages of the transformer slowly increase to the rated voltage. Check and confirm that the energy conversion system PCS and the energy storage system ESS are operating normally. The black start test preparation procedure is completed.
[0007] Furthermore, the black start test preparation procedure includes: Disconnect the high-voltage side of the transformer at the smart transformer station STS, connect the smart subarray control unit SACU, and send a black start command. Check and confirm that the high and low voltages of the transformer slowly increase to the rated voltage. Check and confirm that the energy conversion system PCS and the energy storage system ESS are operating normally. The black start test preparation procedure is completed.
[0008] Furthermore, before step S1, the method further includes checking and confirming that the physical communication circuits between the devices in the energy storage subarray are unobstructed and meet the debugging state, including: Check and confirm that the physical communication circuits between the smart transformer station STS, energy conversion system PCS, energy storage system ESS and smart subarray control unit SACU in the energy storage subarray are connected normally; Confirm that all devices in the energy storage array are powered on, check device alarms, and eliminate all alarms; Confirm that the communication addresses of all devices in the energy storage subarray are correct, and ensure that the smart transformer station STS, energy conversion system PCS and energy storage system ESS can communicate normally with the smart subarray control unit SACU; Check whether all energy storage batteries in the energy storage system ESS can start and sleep normally, and ensure that all energy storage batteries operate normally; After ensuring that the energy storage system ESS is normal, the DC side of the energy conversion system PCS will be energized, the energy conversion system PCS will be started, and the energy conversion system PCS will be monitored for alarms during the start and stop process, and all alarms will be eliminated; After all devices in the energy storage sub-array are inspected, the energy storage sub-arrays that have passed the inspection meet the prerequisites for black start network construction.
[0009] Furthermore, in step S3, the black start network construction includes: during the black start network construction, the energy storage subarray is kept running in a virtual synchronous generator (VSG) mode.
[0010] Furthermore, the S5, performing cold commissioning on one photovoltaic subarray PV, comprises: Check and confirm that the photovoltaic panels, inverters, photovoltaic box transformers and auxiliary equipment of the photovoltaic sub-array have been installed, check and confirm that the primary and secondary wiring are completed, and all cold commissioning work is completed. After confirming that the photovoltaic box transformer and photovoltaic inverter are powered, complete the inverter configuration.
[0011] Furthermore, in step S11, performing n rounds of charging and discharging tests between the four energy storage subarrays connected to the power grid includes: Make three energy storage sub-arrays operate in virtual synchronous generator (VSG) mode, and make one energy storage sub-array operate in constant power control (PQ) mode; Use the three energy storage subarrays operating in the virtual synchronous generator VSG mode to charge one energy storage subarray operating in the PQ mode at a preset charging power, and keep the power of the three energy storage subarrays operating in the virtual synchronous generator VSG mode within a preset range. If it is lower than the preset range, execute step S6.
[0012] In a second aspect, the present invention provides a debugging system for a battery energy storage system in a photovoltaic off-grid microgrid, comprising: Multiple battery energy storage systems BESS, high voltage temporary commissioning power supplies and multiple photovoltaic sub-arrays PV; The battery energy storage system BESS includes multiple energy storage sub-arrays, two of which are connected to a high-voltage temporary debugging power supply; the high-voltage temporary debugging power supply includes a diesel generator and a step-up transformer; The remaining energy storage subarrays are connected to the photovoltaic subarrays PV, and each energy storage subarray has N corresponding photovoltaic subarrays PV.
[0013] Further, the energy storage subarray includes: a smart transformer station STS, an energy conversion system PCS, an energy storage system ESS and a smart subarray control unit SACU; The energy storage system ESS is provided with a plurality of energy storage batteries, and the energy storage system ESS is connected to a plurality of energy conversion systems PCS, and is used to transmit the direct current in the energy storage system ESS to the energy conversion system PCS; The energy conversion system PCS is connected to the smart transformer station STS. The energy conversion system PCS converts the received direct current into alternating current through inversion and transmits it to the smart transformer station STS. The smart transformer station STS boosts the alternating current and transmits it to the substation. Each energy storage subarray is provided with an intelligent subarray control unit SACU; The smart transformer station STS, the energy conversion system PCS and the energy storage system ESS are all connected to the smart subarray control unit SACU.
[0014] In a third aspect, a terminal is provided, including: processor, memory, wherein: The memory is used to store computer programs. The processor is used to call and run the computer program from the memory, so that the terminal executes the above-mentioned terminal method.
[0015] According to a fourth aspect, a computer storage medium is provided, wherein the computer-readable storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the methods described in the above aspects.
[0016] The beneficial effect of the present invention is that the debugging method, system, terminal and storage medium of the battery energy storage system in the off-grid photovoltaic storage microgrid provided by the present invention can no longer rely on the high-voltage temporary debugging power supply for debugging after successfully debugging two energy storage sub-arrays using the high-voltage temporary debugging power supply. In addition, during the debugging process, power can be supplied to the photovoltaic sub-array without having to wait until all battery energy storage systems BESS in the entire station are debugged before use, which greatly shortens the debugging period.
[0017] In addition, the invention has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 is a schematic flow chart of a method according to an embodiment of the present invention.
[0020] Figure 2 It is a schematic block diagram of an energy storage subarray in a system according to an embodiment of the present invention.
[0021] Figure 3 A schematic diagram of the structure of a terminal provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
[0024] The key terms appearing in the present invention are explained below.
[0025] Black start: refers to the situation in which the entire system in a power plant stops operating due to a fault. The system is completely blacked out and in a completely "black" state. It does not rely on any other external power source for help. The grid is started by the generator sets with self-starting capabilities (or energy storage systems with generator starting capabilities) in the system, driving the generator sets without self-starting capabilities, gradually expanding the system recovery range, and ultimately achieving the recovery of the entire system.
[0026] The debugging method of the battery energy storage system in the photovoltaic and off-grid microgrid provided in the embodiment of the present invention is executed by a computer device, and accordingly, the debugging system of the battery energy storage system in the photovoltaic and off-grid microgrid runs in the computer device.
[0027] Figure 1 is a schematic flow chart of a method according to an embodiment of the present invention. Figure 1The execution subject may be a debugging system for a battery energy storage system in a photovoltaic off-grid microgrid. According to different requirements, the order of the steps in the flow chart may be changed, and some may be omitted.
[0028] To facilitate the understanding of the present invention, the debugging method for the battery energy storage system in the photovoltaic off-grid microgrid provided by the present invention is further described below based on the principle of the debugging method for the battery energy storage system in the photovoltaic off-grid microgrid of the present invention and the process of debugging the battery energy storage system in the photovoltaic off-grid microgrid in the embodiment.
[0029] Specifically, Figure 1 As shown, the debugging method of the battery energy storage system in the photovoltaic off-grid microgrid includes: S1. Perform black start test preparatory procedures.
[0030] Disconnect the high-voltage side of the transformer at the smart transformer station STS, connect the smart subarray control unit SACU, and send a black start command. Check and confirm that the high and low voltages of the transformer slowly increase to the rated voltage. Check and confirm that the energy conversion system PCS and the energy storage system ESS are operating normally. The black start test preparation procedure is completed.
[0031] In one possible implementation, before step S1, a step of checking and confirming that the physical communication circuits between the devices in the energy storage subarray are unobstructed and meet the debugging state is included, including: Check and confirm that the physical communication circuit connection between the smart transformer station STS, energy conversion system PCS, energy storage system ESS and smart subarray control unit SACU in the energy storage subarray is normal; confirm that all devices in the energy storage subarray are powered on, check device alarms, and eliminate all alarms; confirm that the communication addresses of all devices in the energy storage subarray are correct, and ensure that the smart transformer station STS, energy conversion system PCS and energy storage system ESS can communicate normally with the smart subarray control unit SACU; check whether all energy storage batteries in the energy storage system ESS can start and sleep normally, and ensure that all energy storage batteries operate normally; after ensuring that the energy storage system ESS is normal, the DC side of the energy conversion system PCS will be powered on, the energy conversion system PCS will be started, and the energy conversion system PCS will be monitored for alarms during the start and stop process, and all alarms will be eliminated; after all devices in the energy storage subarray are checked, check that the qualified energy storage subarray has the prerequisites for black start and network construction.
[0032] Specifically, the energy storage subarray includes a smart transformer station STS, a power conversion system PCS, an energy storage system ESS and a smart subarray control unit SACU.
[0033] It is necessary to ensure that the physical communication circuits from STS (smart transformer station) to SACU (smart sub-array control unit), PCS (energy conversion system) to SACU (smart sub-array control unit), and ESS (energy storage system) to SACU (smart sub-array control unit) are connected, and prepare for the network topology of the entire sub-array.
[0034] Ensure that all devices in the energy storage array are powered on, check device alarms, and eliminate all alarms. When checking device alarms, you can log in to the SACU (intelligent subarray control unit) interface, open the alarm list, and all existing alarms will appear in the alarm list; Common equipment alarms mainly include: 1) STS (smart transformer station): communication failure, transformer heavy gas, light gas, pressure release, high and low oil levels, high oil temperature, excessive oil temperature, high winding temperature, excessive winding temperature, low voltage A side switch trip, low voltage B side switch trip, high voltage room door open alarm, low voltage room door open alarm, high voltage circuit breaker sulfur hexafluoride pressure low alarm, circuit breaker spring no energy storage, transformer instantaneous overcurrent, transformer overcurrent, transformer zero sequence overcurrent, high voltage room high temperature alarm, low voltage room A side high temperature alarm, low voltage room B side high temperature alarm, high voltage room smoke alarm, low voltage room smoke alarm, high and low voltage Room smoke sensor tripping; ESS (energy storage system): mainly includes two parts: CMU (battery monitoring unit) and BCU (battery control unit). The CMU alarms mainly include: UPS alarm, fire alarm, fire system failure, fire gas release, battery box wading alarm, control compartment door limit alarm, battery box door status alarm, control compartment high temperature alarm, control compartment condensation alarm, battery compartment temperature and humidity sensor alarm, control compartment temperature and humidity sensor alarm; BCU (battery control unit) alarms mainly include: ESC (energy storage controller) battery overvoltage, ESC (energy storage controller) battery undervoltage voltage, ESC (energy storage controller) battery short circuit fault, ESC (energy storage controller) battery reverse polarity, ESC (energy storage controller) electrical bus overvoltage, ESC (energy storage controller) bus reverse polarity, power detection module abnormality, ESC (energy storage controller) insulation resistance abnormality, ESC (energy storage controller) overtemperature alarm, ESC (energy storage controller) battery end overtemperature, ESC (energy storage controller) version mismatch, ESC (energy storage controller) internal fan failure, battery monitoring equipment abnormality, battery module internal abnormality, battery module Lock, battery module fan failure, battery pack temperature imbalance, battery pack overvoltage, battery cluster wiring error, battery module optimization unit abnormality, battery module optimization unit overtemperature, busbar copper busbar connection, battery pack SOH (battery health status) low, battery pack overcurrent, battery expansion module high temperature, battery expansion module low temperature, battery pack auxiliary power failure, controller DC auxiliary power failure, battery cluster controller external fan failure, battery cluster controller temperature abnormality, emergency power outage, battery pack version mismatch, communication failure between controller and PCS, communication failure between BCU and smartlogger;PCS (energy conversion system): communication failure, locked state, start state, shutdown state, phase short circuit grounding, off-grid, grid undervoltage, grid overvoltage, grid voltage imbalance, grid overfrequency, grid low frequency, grid frequency instability, output overcurrent, residual current abnormality, grounding abnormality, insulation resistance abnormality, PCS overtemperature, equipment failure, upgrade failure, monitoring unit failure, standby state, grid-connected state, normal power grid-connected operation, limited power grid-connected operation, self-derating grid-connected operation, normal shutdown, fault shutdown, restricted shutdown, external fan abnormality, internal fan abnormality, DC input overvoltage, DC input reverse polarity, DC cable unsafe connection verification failure, off-grid operation. ;
[0035] To eliminate the alarms of the checked equipment, you can first log in to the SACU (intelligent subarray control unit) interface, open the alarm list, and reset the alarms. Some alarms may be eliminated, which means that these alarms no longer exist. For the alarms that have not been reset, you need to eliminate them one by one, find each alarming device, and check the cause of the alarm. Common causes include that the device is not powered on, the internal connection line is not connected or the connection is wrong, the communication line problem requires replacing the communication line, and the damaged parts of the device itself need to be replaced with new equipment parts. Investigate and solve specific problems one by one until all faults are eliminated.
[0036] Ensure that the STS (smart transformer station) and all PCS (power conversion system) and ESS (energy storage system) devices in a single subarray in the energy storage subarray are connected to the SACU (smart subarray control unit) and the network topology of the single subarray. Before the network topology, it is necessary to manually confirm that the communication addresses of all devices in the subarray are correct. This step is mainly to ensure that all devices in the subarray can communicate normally to the SACU (smart subarray control unit) to achieve real-time monitoring of all devices by the SACU (smart subarray control unit); at the same time, before the network topology, all device alarms that affect the start and stop and operation of the equipment must be eliminated first. After the alarms are eliminated, the network topology can be started (during the topology process, if a device alarm occurs, it will cause the failure of this round of network topology).
[0037] Single box start-stop debugging and battery data inspection of ESS (energy storage system) battery box: The debugging process needs to detect whether all battery clusters can start and sleep normally, and check whether the DCDC (intelligent cluster controller) can start normally after the battery cluster is started. Whether the DCDC (intelligent cluster controller) starts normally needs to be judged based on whether the DC busbar at its outlet has DC voltage). At the same time, after the battery cluster is started, the battery status and battery data of each PACK (battery pack) need to be checked one by one to ensure that all batteries are running normally. For example, when checking whether all battery clusters can start and sleep normally, you can first log in to the SACU (intelligent sub-array control unit) interface, enter the battery cluster screen, and issue a start command to each battery cluster one by one, and then check whether each battery cluster has started normally. The inspection method is to check the status of each battery cluster. If it shows running, it means that the battery cluster has started; after all battery clusters are running normally, send shutdown commands one by one, and then check whether each battery cluster has stopped normally. The inspection method is to check the status of each battery cluster. If it shows sleeping, it means that the battery cluster has stopped.
[0038] When checking the battery status and battery data of each battery pack PACK, you can log in to the SACU (intelligent subarray control unit) interface, enter the battery cluster to check whether each battery pack is operating normally and whether there are any alarms. If there are any alarms, go to the local site to handle the PACK.
[0039] The overall start-stop debugging of the ESS (energy storage system) battery box of the entire sub-array: The main purpose is to check whether all ESS (energy storage systems) in the subarray can respond to the start / stop command after the start / stop command is issued to the entire subarray, and to check the status of all batteries in the entire subarray to ensure that the overall start / stop is smooth and trouble-free.
[0040] PCS (power conversion system) stand-alone debugging: Before debugging the PCS (energy conversion system) stand-alone, you must first ensure that the ESS (energy storage system) battery box is debugged, because a prerequisite for PCS (energy conversion system) power-on debugging is that the DC side of the PCS (energy conversion system) is powered on; PCS (energy conversion system) stand-alone debugging is mainly to check whether a single PCS (energy conversion system) can start and stop normally, and monitor whether there is an alarm during the start and stop process of the PCS (energy conversion system). If there is an alarm, it needs to be eliminated simultaneously.
[0041] The PCS (energy conversion system) of the entire sub-array is started and stopped as a whole: The main purpose is to check whether all PCS (energy conversion systems) in the sub-array can respond to the start-stop command after the start-stop command is issued to the entire sub-array, and to check the response time of the start-stop to ensure that the response time is synchronized and can meet the requirements of the black start process for the PCS (energy conversion system) start-up time.
[0042] After all the above steps are completed, the black start test of the entire subarray can be started. Before the black start test, first ensure that the high voltage side of the STS (intelligent transformer station) transformer is disconnected, and the SACU (intelligent subarray control unit) is manually connected on site with a computer. After logging into the SACU (intelligent subarray control unit) system, a black start command is manually issued to the subarray to check that the voltage on the high and low voltage sides of the transformer slowly rises to the rated voltage. At the same time, check whether the operating status of all PCS (energy conversion system) and ESS (energy storage system) is normal during the black start process. When it is confirmed that the voltage is normal and all equipment is operating normally, the black start function test of the entire subarray is completed. When the black start test of the entire subarray is completed, the subarray has the ability to build a network with a black start, that is, the subarray can start a black start with a transformer of a certain capacity to realize the network construction function.
[0043] S2. Use a high-voltage temporary debugging power supply to debug the two energy storage sub-arrays.
[0044] Specifically, since most diesel generators are 400V, and the energy storage sub-array commissioning power supply requires 33KV power supply. Therefore, a step-up transformer is needed to step up the 400V power supply to 33KV power supply to supply power to the energy storage sub-array. Therefore, a diesel generator transformer group needs to be prepared as the early commissioning power supply. In the early stage of project commissioning, since it is an off-grid microgrid, the grid cannot be used to supply power to the energy storage sub-array. Therefore, a temporary high-voltage commissioning power supply (temporary diesel generator and step-up transformer group) needs to be prepared in the early stage of commissioning to supply power to the sub-array. The early commissioning of two sub-arrays has been completed.
[0045] Before completing the black start commissioning of at least two BESS (battery energy storage system) energy storage subarrays, it is imperative to ensure that all photovoltaic panels, inverters, photovoltaic box transformers and auxiliary equipment of at least one photovoltaic subarray are fully installed and the primary and secondary wiring is completed, and that all cold commissioning work is completed. It is ensured that after the photovoltaic box transformer and photovoltaic inverter are powered and the inverter configuration is completed, they can generate electricity normally to charge the BESS (battery energy storage system) energy storage subarray The 33KV switch system connecting the PV (photovoltaic) subarray and the BESS (battery energy storage system) energy storage subarray has been debugged and is ready for power supply. Because the BESS (battery energy storage system) energy storage subarray and the PV (photovoltaic) subarray are connected through the 33KV system, in order for the subsequent PV (photovoltaic) to generate electricity to charge the BESS (battery energy storage system) energy storage subarray, before completing the black start debugging of at least two BESS (battery energy storage system) energy storage subarrays, the 33KV system debugging of the substation must also be completed to ensure that the PV (photovoltaic) subarray can normally and stably transmit electricity to the BESS (battery energy storage system) energy storage subarray.
[0046] S3: After the debugging of the two energy storage sub-arrays is completed, a black start is performed to establish a network based on the two debugged energy storage sub-arrays.
[0047] During black start network construction, the energy storage subarray is kept running in the virtual synchronous generator (VSG) mode.
[0048] Specifically, you can first log in to the SACU (intelligent subarray control unit) interface, select operating parameters - characteristic parameters - change the operating mode to VSG, and start the BLOCK after the setting is completed. Then after the black start is successful, power is supplied to all inverters of the PV photovoltaic subarray and the inverter configuration is completed. For example, after the black start is successful, the PV subarray transformer is impacted, power is supplied to all inverters of the PV photovoltaic subarray and the inverter configuration is completed; S4. Exit the high voltage temporary debugging power supply.
[0049] S5. Perform cold commissioning on one photovoltaic sub-array PV.
[0050] Check and confirm that the photovoltaic panels, inverters, photovoltaic box transformers and auxiliary equipment of the photovoltaic sub-array have been installed, check and confirm that the primary and secondary wiring are completed, and all cold commissioning work is completed. After confirming that the photovoltaic box transformer and photovoltaic inverter are powered, complete the inverter configuration.
[0051] The main configuration of the inverter is as follows: The debugging of photovoltaic inverter is mainly divided into two parts. The first part is the communication between the inverter body and the SACU control box, and the second part is the communication between the inverter and the DCS background.
[0052] 1. SACU communication debugging ① After the cable inspection is completed, supply power to the low-voltage side of the box-type transformer, check whether the circuit breakers on the low-voltage side are all closed, and close all low-voltage side AC circuit breakers, including all inverters and PIDs, check whether the SACU power supply is normal and power it on, power on PID1 and PID2, and close the DC circuit breakers of all inverters.
[0053] ②Use Huawei USB flash drive (USB-Adapter2000-C) to connect to PID1 and PID2, connect to sun2000 software, change the PID baud rate to 9600, and set the time to local time.
[0054] ③ Change the computer IP to the network number of the SACU IP address. At this time, use an Internet cable to connect to the GE3 port of the SmartModule in the SAKU. You can enter the data acquisition interface by logging in to the general address of the SACU.
[0055] ④ Change the SACU IP address. After entering the data logger, change the SACU IP address. Click Settings → Communication Parameters → Wired Network, change the IP address. The address is provided by Huawei. Confirm after the change. After the change is completed, connect the official network cable from SACU to the box-type switch to the network port of the Smart Logger. After successful communication, you can connect to SACU through the Chint switch on the main control and change the SACU time to local time. ⑤ Search for the inverter. Click Maintenance → Device Management → Device Access → Automatic Search → Confirm to start searching for the inverter on the data acquisition. Before searching, you need to confirm that the inverter AC circuit breaker is closed. After the search is completed, check whether the number of inverters is correct. If the number of inverters is missing, first check whether the circuit breaker is closed. After the SN code and KKS code are checked, filter out which inverter is missing and check whether it is normal on the inverter body. It is also possible that an inverter has been connected to other blocks under the same bus. Check whether the number of other blocks is correct and whether the whitelist is configured correctly. ⑥ Change the grid standard code of the inverter. Before setting, the DC circuit breakers at the bottom of all inverters need to be closed. After the inverter search is completed, click Device Monitoring → Select any inverter → Operation Parameters → Grid Parameters → Grid Standard Code → Select SAUDI-MV800 → Batch Setting → All → Confirm. After batch setting, some inverters will fail to set because the communication has not been established after the DC switch is closed, and you need to wait for a while, or the DC circuit breaker is not closed. Finally, you need to confirm that all inverters have been configured. (II) DCMS communication debugging ① Configure the device list. Count the KKS codes and SN codes of all inverters, and export the device list of a Block in the data acquisition (Maintenance → Device Management → Device List → Device Information Export), use this as a template, and replace the initial name of the inverter in the table with the corresponding SSK according to the SN code, and delete the PID and MBUS at the bottom, leaving only the inverter. If you find that there is an unmatched SN code, you need to go to the site to confirm whether the SN code is copied incorrectly. After the change is completed, the inverter KKS is arranged in ascending order, and the address is arranged in ascending order starting from 6 (the address of inverter No. 1 is 6). If there are 43 inverters, the address of inverter No. 43 is 48. After the change is completed, import the file (Maintenance → Device Management → Device List → Device Information Import), and the file format must be .csv. After the import is successful, the name of the inverter in the device monitoring will be changed to the modified KKS name, and check whether the KKS and address are correct.
[0056] ② Set up a whitelist. After setting up the whitelist, the inverter will not go to other blocks, and the inverters of other blocks will not be able to enter this block. First, confirm the positions of the two PIDs corresponding to the A and B sides of the box transformer. After confirmation, add the inverters on the corresponding sides to the corresponding PIDs. For example, PID1 is on the A side, and inverters No. 23-44 are also on the A side, then set inverters No. 23-44 to the whitelist of PID1. MBUS-CCO is divided into two, one is the built-in CCO, MBUS-inside, defined as PID1, and the other is the external CCO, MBUS (COM3-249), which is PID2. Configure the MBUS-inside whitelist, delete the inverters except PID1 in the device list file, and then import it. Click Device Monitoring → MBUS → MBUS-inside → Network Settings → SN List → Import → Submit ③ Configure 104 communication. Click Settings → Communication Parameters → IEC104, select Enable (limited) for link enable, then submit, select IEC104-1, change the IP address and default segment interval of telemetering (provided by Huawei), submit after changing, select IEC104-2, change the IP address and default segment interval of telemetering, click Configuration Export in the IEC104-1 interface, use this as a template, change the content of the 104 file, import it into IEC104-1 and IEC104-2 after changing, click Configuration Import, import the file, and check whether all devices have been configured after importing. Check the DCMS background analog quantity. If 104 configuration is successful, the background analog quantity bad point becomes a good point, and there is data. ④ Software upgrade. Before updating, you need to disable delayed upgrade. Click Device Monitoring → Select any inverter → Operation Parameters → Characteristic Parameters → Disable delayed upgrade → Batch setting. Then upgrade. Click Maintenance → Software Upgrade → Select File → Upload → Software Upgrade. First update SmartLogger3000. After the update is complete, you need to reset the password and log in again. Then update SmartLogger3000_bsp. The update package is provided by the manufacturer. Then upgrade MBUS and inverters step by step.
[0057] ⑤ After the update is completed, start and stop each inverter separately in the DCMS background to check whether the start and stop functions are normal and whether the communication configuration is misplaced. Then check the start and stop functions of the entire group of blocks in the background.
[0058] S6. Use the debugged photovoltaic sub-array PV to charge the debugged energy storage sub-array, and keep the power of the energy storage sub-array within a preset range.
[0059] Specifically, the photovoltaic BLOCK that has been debugged can be started, and the power can be set to charge the BESS that has been debugged.
[0060] S7. Use two energy storage subarrays to debug other undebugged energy storage subarrays.
[0061] S8. During the debugging process, if the power of a certain energy storage subarray is lower than a preset range, execute step S6.
[0062] S9. Complete the debugging of the third and fourth energy storage subarrays.
[0063] S10, integrating the debugged third and fourth energy storage subarrays into the power grid established in step S3 in a virtual synchronous generator (VSG) mode.
[0064] S11. Perform n rounds of charge-discharge tests between the four energy storage sub-arrays connected to the grid to complete battery calibration and activation of the energy storage sub-arrays in the grid.
[0065] Make three energy storage subarrays operate in the virtual synchronous generator VSG mode, and make one energy storage subarray operate in the constant power control PQ mode; use the three energy storage subarrays operating in the virtual synchronous generator VSG mode to charge one energy storage subarray operating in the PQ mode at a preset charging power, and keep the power of the three energy storage subarrays operating in the virtual synchronous generator VSG mode within a preset range. If it is lower than the preset range, execute step S6.
[0066] S12, operate the four energy storage sub-arrays in the power grid in the virtual synchronous generator (VSG) mode, perform n rounds of charge and discharge tests on the next energy storage sub-array, and complete battery calibration and activation of the next energy storage sub-array.
[0067] S13, repeat step S11 until the battery calibration and activation of all energy storage subarrays are completed and the entire station officially supplies power to the outside.
[0068] Specifically, the steps of the joint debugging test method are as follows: 1) First, use the temporary high-voltage debugging power supply (temporary diesel generator and step-up transformer group) to supply power to the first subarray to be debugged, and then complete the single subarray debugging according to the debugging process in Section 1 (BESS (battery energy storage system) energy storage subarray debugging process); 2) After completing the black start debugging of at least two subarrays, these two subarrays can be used with the transformer of a PV (photovoltaic) subarray that has been cold-commissioned to perform black start and grid construction. During black start and grid construction, the BESS (battery energy storage system) energy storage subarray must operate in VSG (virtual synchronous generator) mode; 3) After the black start is successful, power is supplied to all inverters of the PV (photovoltaic) subarray and inverter configuration is completed; 4) Exit the high-voltage temporary debugging power supply (temporary diesel generator and step-up transformer group) and start charging the two BESS (battery energy storage system) energy storage sub-arrays that have been debugged; 5) Ensure that the SOC (State of Charge) of the two BESS (battery energy storage system) energy storage subarrays is approximately 40%--60%. This SOC (State of Charge) can meet the debugging of the remaining single BESS (battery energy storage system) energy storage subarrays; if during the debugging process, the SOC (State of Charge) of the two energy storage subarrays is lower than 40% due to the consumption of debugging of other subarrays, start the photovoltaic subarray to charge the two BESS (battery energy storage system) energy storage subarrays to control the SOC (State of Charge) of the two BESS (battery energy storage system) energy storage subarrays to always maintain at 40%--60%; 6) Using step 5, complete the debugging of the remaining energy storage subarrays; 7) After the black start debugging of the fourth BESS (battery energy storage system) energy storage subarray is completed, the charging and discharging between the BESS (battery energy storage system) energy storage subarrays can be started, that is, the three BESS (battery energy storage system) energy storage subarrays operate in VSG (virtual synchronous generator) mode, and the fourth subarray operates in PQ mode (in the early debugging process, we also tried to use 1 VSG (virtual synchronous generator) mode energy storage subarray with 1 PQ mode energy storage subarray for charging and discharging, and also tried to use 2 VSG (Virtual Synchronous Generator) mode energy storage subarray with one PQ mode energy storage subarray for charging and discharging. In these two modes, the established microgrid is unstable and ultimately fails). Because the PQ mode subarray has the characteristic of being able to fully respond to dispatch instructions, three VSG (Virtual Synchronous Generator) mode energy storage subarrays are used to discharge and charge the PQ mode subarray at the same time. The charging power of the subarray operating in PQ mode is set according to the contract guarantee value. It is also necessary to calculate the average SOC (State of Charge, remaining power), and during the charging and discharging process, each subarray has auxiliary loss at all times, which will also consume SOC (State of Charge, remaining power), so this part of the loss must also be calculated. After rough calculation, if after a round of charging and discharging is completed, if the average SOC (State of Charge, remaining power) is too low, the subarray operating in PQ mode can use the PV (photovoltaic) subarray to charge the PQ subarray during the charging process to reduce the discharge power of the three BESS (battery energy storage system) energy storage subarrays in VSG (virtual synchronous generator) mode, so as to avoid the three BESS (battery energy storage system) energy storage subarrays in VSG (virtual synchronous generator) mode SOC (State of Charge, remaining power) is too low when the PQ mode subarray is full; for the PQ mode energy storage subarray, at least 3 rounds of full charging and discharging need to be completed to complete battery calibration and activation; 8) Using the method in step 7), the above four sub-arrays can be charged and discharged in turn, and the battery calibration and activation of the four sub-arrays can be completed; 9) While carrying out step 7), the preliminary commissioning of other energy storage sub-arrays can also be continued, and the inverter configuration of other PV (photovoltaic) sub-arrays can also be completed at the same time; 10) After completing 3 rounds of full charge and discharge tests on the first 4 subarrays, these 4 subarrays can be operated in VSG (virtual synchronous generator) mode, and the next subarray can be operated in PQ mode to complete 3 rounds of full charge and discharge tests on the next subarray, completing the battery calibration and activation of subarray 5; 11) As more and more energy storage sub-arrays are gradually put into use, repeat the method in step 10) to gradually complete three rounds of full charging and discharging of all energy storage sub-arrays, and finally complete the battery calibration and activation of all sub-arrays in the entire station.
[0069] The present invention provides a debugging system for a battery energy storage system in a photovoltaic off-grid microgrid. Figure 2 As shown, the system includes: multiple battery energy storage systems BESS, a high-voltage temporary debugging power supply and multiple photovoltaic sub-arrays PV.
[0070] The battery energy storage system BESS includes multiple energy storage sub-arrays, two of which are connected to a high-voltage temporary debugging power supply; the high-voltage temporary debugging power supply includes a diesel generator and a step-up transformer. The remaining energy storage sub-arrays are connected to a photovoltaic sub-array PV, and each energy storage sub-array has N corresponding photovoltaic sub-arrays PV.
[0071] In one possible implementation, the energy storage subarray includes: a smart transformer station STS, a power conversion system PCS, an energy storage system ESS and a smart subarray control unit SACU.
[0072] The energy storage system ESS is provided with a plurality of energy storage batteries, and the energy storage system ESS is connected to a plurality of energy conversion systems PCS, and is used to transmit the DC power in the energy storage system ESS to the energy conversion system PCS. The energy conversion system PCS is connected to the smart transformer station STS, and the energy conversion system PCS converts the received DC power into AC power through inversion, and transmits it to the smart transformer station STS, and the smart transformer station STS boosts the AC power and transmits it to the substation.
[0073] Each energy storage subarray is provided with a smart subarray control unit SACU. The smart transformer station STS, the energy conversion system PCS and the energy storage system ESS are all connected to the smart subarray control unit SACU.
[0074] Figure 3 This is a structural schematic diagram of a terminal 300 provided in an embodiment of the present invention. The terminal 300 can be used to execute the debugging method of the battery energy storage system in the photovoltaic off-grid microgrid provided in an embodiment of the present invention.
[0075] The terminal 300 may include: a processor 310, a memory 320 and a communication unit 330. These components communicate via one or more buses. Those skilled in the art will appreciate that the server structure shown in the figure does not limit the present invention, and it may be a bus structure or a star structure, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.
[0076] The memory 320 can be used to store the execution instructions of the processor 310, and the memory 320 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. When the execution instructions in the memory 320 are executed by the processor 310, the terminal 300 can perform some or all of the steps in the following method embodiments.
[0077] The processor 310 is the control center of the storage terminal, and uses various interfaces and lines to connect various parts of the entire electronic terminal. It runs or executes software programs and / or modules stored in the memory 320, and calls data stored in the memory to perform various functions of the electronic terminal and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 310 can only include a central processing unit (CPU). In the embodiment of the present invention, the CPU can be a single computing core or multiple computing cores.
[0078] The communication unit 330 is used to establish a communication channel so that the storage terminal can communicate with other terminals, receive user data sent by other terminals or send user data to other terminals.
[0079] The present invention also provides a computer storage medium, wherein the computer storage medium may store a program, and when the program is executed, the program may include some or all of the steps in each embodiment provided by the present invention. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).
[0080] Therefore, the present invention can no longer rely on the high-voltage temporary debugging power supply for debugging after successfully debugging the two energy storage sub-arrays using the high-voltage temporary debugging power supply. In addition, during the debugging process, power can be supplied to the photovoltaic sub-array without waiting for all the battery energy storage systems BESS in the entire station to be debugged before use, which greatly shortens the debugging period. The technical effects that can be achieved by this embodiment can be found in the description above and will not be repeated here.
[0081] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution in the embodiments of the present invention, in essence or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes, including several instructions for enabling a computer terminal (which can be a personal computer, a server, or a second terminal, a network terminal, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention.
[0082] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the terminal embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.
[0083] In the several embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of systems or modules, which can be electrical, mechanical or other forms.
[0084] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0085] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.
[0086] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.
Claims
1. A debugging method for a battery energy storage system in a photovoltaic off-grid microgrid, characterized in that: include: S1. Perform black start test preparatory procedures; S2. Use a high-voltage temporary debugging power supply to debug the two energy storage sub-arrays; S3: After the debugging of the two energy storage sub-arrays is completed, a black start is performed to establish a network based on the two debugged energy storage sub-arrays; S4, exit the high voltage temporary debugging power supply; S5. Perform cold commissioning on one photovoltaic sub-array PV; S6. Use the debugged photovoltaic sub-array PV to charge the debugged energy storage sub-array, and keep the power of the energy storage sub-array within a preset range; S7, using two energy storage sub-arrays to debug other undebugged energy storage sub-arrays; S8. During the debugging process, if the power of a certain energy storage subarray is lower than a preset range, execute step S6; S9, completing the debugging of the third and fourth energy storage subarrays; S10, incorporating the debugged third and fourth energy storage subarrays into the power grid established in step S3 in a virtual synchronous generator (VSG) mode; S11, performing n rounds of charging and discharging tests between energy storage sub-arrays connected to the power grid to complete battery calibration and activation of the energy storage sub-arrays in the power grid; S12, operating the energy storage subarray in the power grid in the virtual synchronous generator (VSG) mode, performing n rounds of charge and discharge tests on the next energy storage subarray, and completing battery calibration and activation of the next energy storage subarray; S13, repeat step S11 until the battery calibration and activation of all energy storage sub-arrays are completed and the entire station officially supplies power to the outside.
2. The method according to claim 1, characterized in that The black start test preparation procedure includes: Disconnect the high-voltage side of the transformer at the smart transformer station STS, connect the smart subarray control unit SACU, and send a black start command. Check and confirm that the high and low voltages of the transformer slowly increase to the rated voltage. Check and confirm that the energy conversion system PCS and the energy storage system ESS are operating normally. The black start test preparation procedure is completed.
3. The method according to claim 1, characterized in that Before step S1, the process also includes checking and confirming that the physical communication circuits between the devices in the energy storage subarray are unobstructed and meet the debugging state, including: Check and confirm that the physical communication circuits between the smart transformer station STS, energy conversion system PCS, energy storage system ESS and smart subarray control unit SACU in the energy storage subarray are connected normally; Confirm that all devices in the energy storage array are powered on, check device alarms, and eliminate all alarms; Confirm that the communication addresses of all devices in the energy storage subarray are correct, and ensure that the smart transformer station STS, energy conversion system PCS and energy storage system ESS can communicate normally with the smart subarray control unit SACU; Check whether all energy storage batteries in the energy storage system ESS can start and sleep normally, and ensure that all energy storage batteries operate normally; After ensuring that the energy storage system ESS is normal, the DC side of the energy conversion system PCS will be energized, the energy conversion system PCS will be started, and the energy conversion system PCS will be monitored for alarms during the start and stop process, and all alarms will be eliminated; After all devices in the energy storage sub-array are inspected, the energy storage sub-arrays that have passed the inspection meet the prerequisites for black start network construction.
4. The method according to claim 1, characterized in that In step S3, the black start network construction includes: during the black start network construction, the energy storage subarray is kept running in a virtual synchronous generator (VSG) mode.
5. The method according to claim 1, characterized in that The step S5, performing cold commissioning on a photovoltaic subarray PV, comprises: Check and confirm that the photovoltaic panels, inverters, photovoltaic box transformers and auxiliary equipment of the photovoltaic sub-array have been installed, check and confirm that the primary and secondary wiring are completed, and all cold commissioning work is completed. After confirming that the photovoltaic box transformer and photovoltaic inverter are powered, complete the inverter configuration.
6. The method according to claim 1, characterized in that In step S11, performing n rounds of charging and discharging tests between the four energy storage subarrays connected to the power grid includes: Make three energy storage sub-arrays operate in virtual synchronous generator (VSG) mode, and make one energy storage sub-array operate in constant power control (PQ) mode; Use the three energy storage subarrays operating in the virtual synchronous generator VSG mode to charge one energy storage subarray operating in the PQ mode at a preset charging power, and keep the power of the three energy storage subarrays operating in the virtual synchronous generator VSG mode within a preset range. If it is lower than the preset range, execute step S6.
7. A debugging system for a battery energy storage system in an off-grid photovoltaic storage microgrid, characterized in that: include: Multiple battery energy storage systems BESS, high voltage temporary commissioning power supplies and multiple photovoltaic sub-arrays PV; The battery energy storage system BESS includes multiple energy storage sub-arrays, two of which are connected to a high-voltage temporary debugging power supply; the high-voltage temporary debugging power supply includes a diesel generator and a step-up transformer; The remaining energy storage subarrays are connected to the photovoltaic subarrays PV, and each energy storage subarray has N corresponding photovoltaic subarrays PV.
8. The system according to claim 7, characterized in that The energy storage subarray includes: a smart transformer station STS, an energy conversion system PCS, an energy storage system ESS and a smart subarray control unit SACU; The energy storage system ESS is provided with a plurality of energy storage batteries, and the energy storage system ESS is connected to a plurality of energy conversion systems PCS, and is used to transmit the direct current in the energy storage system ESS to the energy conversion system PCS; The energy conversion system PCS is connected to the smart transformer station STS. The energy conversion system PCS converts the received direct current into alternating current through inversion and transmits it to the smart transformer station STS. The smart transformer station STS boosts the alternating current and transmits it to the substation. Each energy storage subarray is provided with an intelligent subarray control unit SACU; The smart transformer station STS, the energy conversion system PCS and the energy storage system ESS are all connected to the smart subarray control unit SACU.
9. A terminal, characterized in that: include: A memory, used for storing a debugging program of a battery energy storage system in a photovoltaic off-grid microgrid; A processor is used to implement the steps of the debugging method of the battery energy storage system in the photovoltaic off-grid microgrid as described in any one of claims 1 to 6 when executing the debugging program of the battery energy storage system in the photovoltaic off-grid microgrid.
10. A computer-readable storage medium storing a computer program, characterized in that: The readable storage medium stores a debugging program for the battery energy storage system in an off-grid photovoltaic storage microgrid. When the debugging program for the battery energy storage system in an off-grid photovoltaic storage microgrid is executed by a processor, the steps of the debugging method for the battery energy storage system in an off-grid photovoltaic storage microgrid are implemented as described in any one of claims 1-6.