Station-level multi-cabin cooperative network scheduling control system and method

Abstract

The application discloses a yard-level multi-cabin cooperative network construction scheduling control system and method. When a yard-level controller determines that a current control mode is an automatic power generation control mode, a power intelligent control instruction is generated, current integrated cabin working parameters of corresponding boost integrated cabins are acquired from each cabin-level controller connected, a current power output task corresponding to each boost integrated cabin is determined based on a multi-target optimization power distribution strategy, and the current power output task is distributed to the corresponding boost integrated cabin. For each boost integrated cabin, the boost integrated cabin receives the current power output task sent by the yard-level controller, and executes the current power output task based on a preset in-cabin flow control strategy. The embodiment of the application can more intelligently distribute the current power output task according to the current integrated cabin working parameters of each boost integrated cabin connected by the yard-level controller and the specific model of the boost integrated cabin, so that the boost integrated cabin outputs power in a flow balancing mode.

Description

Technical Field

[0001] This application relates to the field of intelligent control engineering technology for energy storage power stations, and in particular to a multi-compartment collaborative network scheduling control system and method at the station level. Background Technology

[0002] Currently, with the deepening of the construction of new power systems, the proportion of new energy grid connection continues to increase, and the inertia level of power systems is constantly decreasing. Grid-based energy storage has become a key technology to support the stable operation of new power systems, and megawatt-level grid-based energy storage power stations are the main application form. Unlike the independent phase-locked loop and second-level dispatch mode of grid-connected energy storage power stations, grid-based energy storage power stations use voltage source control, which cannot adapt to the requirements of grid operation and has the following technical defects: 1) The energy storage power station adopts grid-based energy storage, and specifically uses voltage source control. The traditional EMS (Energy Management System) has a control cycle of 100ms~1s, which is insufficient in real time. 2) Energy storage power stations using grid-type energy storage only support a fixed number of parallel units, making it difficult to be compatible with the two mainstream integrated booster compartment configurations of 12 units / compartment and 24 units / compartment. Mixed networking of large and small compartments requires manual configuration of each unit, resulting in a long commissioning cycle. 3) Power allocation is only performed according to capacity ratio, without taking into account factors such as the difference in SOC (State of Charge, which represents the percentage of the battery's current remaining capacity) of each booster compartment, which can easily lead to overcharging and over-discharging of the battery and a decrease in cycle life. Summary of the Invention

[0003] This application provides a site-level multi-compartment collaborative grid-connected scheduling control system and method, which aims to solve the problem that in the prior art, energy storage power stations using grid-connected energy storage can only support a fixed number of parallel units and are difficult to be compatible with various mainstream integrated booster compartment configurations.

[0004] In the first aspect, the embodiments of this application provide a station-level multi-module collaborative network scheduling and control system, which includes: a station-level controller and multiple integrated booster modules, wherein the multiple integrated booster modules correspond to at least two different numbers of parallel energy storage converters; Each of the multiple integrated booster compartments is equipped with a compartment-level controller and a transformer equipment group, and the transformer equipment group is also connected to an energy storage battery pack. The transformer equipment group includes multiple energy storage converters and a boost transformer. The multiple energy storage converters are connected in parallel to a three-phase AC bus. The input terminal of the boost transformer is connected to the three-phase AC bus, and the output terminal of the boost transformer is used to connect to a collector line. The energy storage battery pack includes multiple energy storage battery clusters, each energy storage battery cluster is composed of multiple energy storage batteries connected in series, and each energy storage battery cluster is uniquely connected to one of the multiple energy storage converters. The compartment-level controller is communicatively connected to the station-level controller, and the compartment-level controller is also communicatively connected to the multiple energy storage converters in the transformer equipment group, the boost transformer, and each energy storage battery cluster in the energy storage battery pack. The station-level controller is used to respond to the power intelligent control command generated when the current control mode is determined to be the automatic power generation control mode according to the preset control cycle, obtain the current integrated module working parameters of the corresponding booster module from the connected module-level controllers, and determine the current power output task corresponding to each booster module based on the preset multi-objective optimized power allocation strategy and distribute it to the corresponding booster module. The integrated booster compartment is used to receive the current power output task sent by the site-level controller, and to control and execute the current power output task according to the preset in-compartment current sharing control strategy, so that the multiple energy storage converters in the integrated booster compartment output power in a current sharing manner.

[0005] Secondly, embodiments of this application also provide a station-level multi-compartment collaborative network scheduling and control method, applied to the station-level multi-compartment collaborative network scheduling and control system as described in the first aspect above, the method comprising: The station-level controller responds to the power intelligent control command generated when the current control mode is determined to be the automatic power generation control mode according to the preset control cycle. It obtains the current integrated module operating parameters of the corresponding integrated booster module from the connected module-level controllers, and determines the current power output task corresponding to each integrated booster module based on the preset multi-objective optimized power allocation strategy and distributes it to the corresponding integrated booster module. For each of the multiple integrated booster modules that are communicatively connected to the site-level controller, when the integrated booster module receives the current power output task sent by the site-level controller, it controls and executes the current power output task according to the preset in-module current sharing control strategy, so that the multiple energy storage converters in the integrated booster module output power in a current sharing manner.

[0006] This application provides a site-level multi-module collaborative network scheduling control system and method. The method includes: a site-level controller responding to a power intelligent control command generated when the current control mode is determined to be automatic power generation control mode according to a preset control cycle, obtaining the current integrated module operating parameters of the corresponding booster module from each connected module-level controller, and determining the current power output task corresponding to each booster module based on a preset multi-objective optimized power allocation strategy and distributing it to the corresponding booster module; for each of the multiple booster modules communicatively connected to the site-level controller, upon receiving the current power output task sent by the site-level controller, the booster module controls and executes the current power output task according to a preset in-module current sharing control strategy, so that the multiple energy storage converters in the booster module output power in a current sharing manner. This application embodiment can more intelligently allocate the current power output task according to the current integrated module operating parameters of each booster module connected to the site-level controller and the specific model of the booster module, so that it outputs power in a current sharing manner. Attached Figure Description

[0007] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 A schematic block diagram of a station-level multi-compartment collaborative network scheduling and control system provided in an embodiment of this application; Figure 2 A flowchart illustrating the station-level multi-compartment collaborative network scheduling and control method provided in this application embodiment; Figure 3 Another flowchart illustrating the station-level multi-compartment collaborative network scheduling and control method provided in this application embodiment; Figure 4 A schematic diagram of the first sub-process of the station-level multi-compartment collaborative network scheduling and control method provided in the embodiments of this application; Figure 5 A schematic diagram of the second sub-process of the station-level multi-compartment collaborative network scheduling and control method provided in the embodiments of this application; Figure 6 A schematic diagram of the third sub-process of the station-level multi-compartment collaborative network scheduling and control method provided in the embodiments of this application; Figure 7 A schematic diagram of the fourth sub-process of the station-level multi-compartment collaborative network scheduling and control method provided in the embodiments of this application; Figure 8This is a schematic diagram of the fifth sub-process of the station-level multi-compartment collaborative network scheduling and control method provided in the embodiments of this application. Detailed Implementation

[0009] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0010] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0011] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0012] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0013] Please see Figure 1 This is a schematic block diagram of the station-level multi-compartment collaborative network scheduling control system provided in the embodiments of this application. Figure 1 As shown, the station-level multi-module collaborative network scheduling and control system includes a station-level controller 100 and multiple integrated booster modules, which correspond to at least two different numbers of parallel energy storage converters. Each of the multiple integrated booster compartments 200 is equipped with a compartment-level controller 210 and a transformer equipment group 220, and the transformer equipment group 220 is also connected to the energy storage battery group 230; the transformer equipment group 220 includes multiple energy storage converters and a boost transformer 223; the multiple energy storage converters are connected in parallel to the three-phase AC bus 222; the input terminal of the boost transformer 223 is connected to the three-phase AC bus 222, and the output terminal of the boost transformer 223 is used to connect to the collector line 300. The energy storage battery pack 230 includes multiple energy storage battery clusters, each energy storage battery cluster 231 is composed of multiple energy storage batteries connected in series, and each energy storage battery cluster 231 is uniquely connected to one of the multiple energy storage converters 221; the cabin-level controller 210 is communicatively connected to the station-level controller 100, and the cabin-level controller 210 is also communicatively connected to the multiple energy storage converters in the transformer equipment group 220, the step-up transformer 223, and each energy storage battery cluster 231 in the energy storage battery pack 230; The station-level controller 100 is used to respond to the power intelligent control command generated when the current control mode is determined to be the automatic power generation control mode according to the preset control cycle, obtain the current integrated module working parameters of the corresponding booster integrated module 200 from the connected module-level controllers 210, and determine the current power output task corresponding to each booster integrated module 200 based on the preset multi-objective optimized power allocation strategy and distribute it to the corresponding booster integrated module 200. The integrated booster compartment 200 is used to receive the current power output task sent by the site-level controller 100, and to control and execute the current power output task according to the preset in-compartment current sharing control strategy, so that the multiple energy storage converters in the integrated booster compartment 200 output power in a current sharing manner.

[0014] In this embodiment, the site-level multi-module collaborative network scheduling control system is specifically deployed in the energy storage power station and includes at least one site-level controller 100 (which can be an industrial-grade multi-core controller in specific implementations) and multiple integrated booster modules. Unlike existing energy storage power stations that only support a fixed number of parallel units, the multiple integrated booster modules correspond to at least two different numbers of parallel energy storage converters. For example, one type of integrated booster module has 12 parallel energy storage converters (i.e., including 12 energy storage converters), and another type has 24 parallel energy storage converters (i.e., including 24 energy storage converters). When the system is powered on, the site-level controller 100 automatically identifies the number of online energy storage converters in each of the multiple integrated booster modules connected to it and loads the corresponding control parameter set, thereby enabling mixed networking of integrated booster modules of different sizes. The output of the step-up transformer 223 in the integrated booster compartment 200 is connected to the power grid 600 in sequence through the collector line 300, the oil-immersed main transformer 400 and the GIS switchgear 500 (GIS stands for Gas Insulated Switchgear).

[0015] If the power of a single energy storage converter is 215 kilowatts, the following will introduce the integrated booster compartment with 12 energy storage converters (which can be referred to as the small compartment type integrated booster compartment) and the integrated booster compartment with 24 energy storage converters (which can be referred to as the large compartment type integrated booster compartment). The rated power of the small-cabin-type integrated booster compartment is 2.58 MW (215 kW × 12 = 2.58 MW). Each energy storage converter in the small-cabin-type integrated booster compartment is connected to an energy storage battery cluster 231 on the DC side. When an energy storage battery cluster 231 includes four 104S / 314Ah lithium iron phosphate battery packs connected in series (each lithium iron phosphate battery pack has a rated voltage of 3.2V), the rated voltage of an energy storage battery cluster 231 is equal to 3.2V × 104 × 4 = 1331.2V, and the operating voltage range is 1164.8V to 1456V. The rated current on the DC side of a single 215 kW energy storage converter is approximately 162A (i.e., 215000W ÷ 1331.2V ≈ 162A). The AC sides of multiple energy storage converters in the small-cabin-type integrated booster compartment are connected in parallel to the three-phase AC bus 222 with a voltage of 690V. If the rated current of a single energy storage converter is 174A (215000W÷(sqrt(3)×690V≈174A), then the total current of a single compartment of the small-cabin-type integrated booster compartment is 2088A. The three-phase AC bus 222 with a voltage of 690V can also be connected to the collector line 30 through the step-up transformer 223. The system has zero connection points to boost 690V to 10kV or 35kV. Furthermore, the collector line 300 connects to the oil-immersed main transformer 400, which boosts the voltage to 110kV or 220kV, before connecting to the power grid 600 via the GIS switchgear 500. In a 100MW energy storage power station application scenario, 40 small-module booster modules are required, or a combination of small-module and large-module booster modules can be deployed to ensure a total power output of 100MW.

[0016] The rated power of the large-capacity integrated booster compartment is 5.16 MW (215 kW × 24 = 5.16 MW). Each energy storage converter in the large-capacity integrated booster compartment is connected to an energy storage battery cluster 231 on the DC side. When an energy storage battery cluster 231 also includes four 104S / 314Ah lithium iron phosphate battery packs connected in series (each lithium iron phosphate battery pack has a rated voltage of 3.2V), then the rated voltage of an energy storage battery cluster 231 is equal to 3.2V × 104 × 4 = 1331.2V, and the operating voltage range is 1164.8V~1456V. The rated current on the DC side of a single 215 kW energy storage converter is approximately 162A (i.e., 215000W ÷ 1331.2V ≈ 162A). The AC sides of multiple energy storage converters in the large-capacity integrated booster compartment are connected in parallel to a three-phase AC busbar 222 with a voltage of 690V. If the rated current of a single energy storage converter is 174A (215000W ÷ (sqrt(3) × 690V ≈ 174A), then the total current of a single compartment of the large-capacity integrated booster compartment is 4176A. The three-phase AC busbar 222 with a voltage of 690V can also be connected to the collector line through a booster transformer 223. A 300-connection system is used to boost the voltage from 690V to 35kV. Furthermore, the collector line 300 connects to the oil-immersed main transformer 400, which then boosts the voltage to 110kV or 220kV before connecting to the power grid 600 via the GIS switchgear 500. In a 100MW energy storage power station application scenario, 20 large-module integrated booster modules are required, or a mix of small-module and large-module integrated booster modules can be deployed to ensure a total power output of 100MW.

[0017] When the system is powered on, the site-level controller 100 automatically identifies the number of online energy storage converters in each of the multiple integrated booster modules connected to it, and loads the corresponding control parameter set. This enables the mixed networking of booster modules of varying sizes. The specific process is as follows: Each booster module first performs a self-test to determine whether the energy storage converters and other components within the booster module can power on and operate normally, and whether they can communicate normally. If the booster module fails the self-test, the site-level controller 100 reports an alarm message to the corresponding receiving terminal and does not start. After each booster module completes its self-test, passes the self-test, and initially starts, the site-level controller 100 scans the online status of each booster module and sequentially reads the number of online energy storage converters in each booster module. (The last sentence appears to be incomplete and possibly refers to a different process.) The online status of each booster module is scanned and read at a scan cycle of 100ms (the scan cycle value can be flexibly adjusted according to actual user needs and is not limited to the value in the example above). A successful scan is confirmed only if the number of online energy storage converters in the same booster module is the same after three consecutive scans by the site-level controller 100. If the site-level controller 100 reads that there are 12 online energy storage converters in a booster module, it is marked as a small-module booster module; if the site-level controller 100 reads that there are 24 online energy storage converters in a booster module, it is marked as a large-module booster module. If the number of online energy storage converters in a booster module is neither 12 nor 24, it is marked as a custom capacity booster module. After the station-level controller 100 iterates through and reads the model of each connected booster module and the number of online energy storage converters, it can calculate the total capacity of the energy storage power station and the total number of online energy storage converters. After completing the above statistics, the station-wide time synchronization is initiated to ensure that the clocks of each device are aligned. For example, the station-level controller 100 uses the Precision Time Protocol (PTP, such as the IEEE 1588v2 protocol) to achieve full station time synchronization with each booster module. When the clock error between the station-level controller 100 and any two booster modules does not exceed 1 microsecond, the clock synchronization is considered successful. If the clock synchronization fails, it will be retried up to three times. Otherwise, if it fails more than three times, the clock synchronization is considered to have failed and the subsequent process will stop. A clock synchronization failure prompt message will be generated and sent to the corresponding receiving terminal through the connected communication module. After successful clock alignment, the entire system can select an operating mode, such as grid-connected mode or black boot mode. Once the operating mode is selected, the corresponding operating mode will be started.

[0018] After the initialization and power-on of the station-level multi-module collaborative network scheduling control system is completed, the station-level controller 100 responds to the power intelligent control command generated when the current control mode is determined to be the automatic power generation control mode according to the preset control cycle (e.g., set to 10ms, the above value can be flexibly adjusted according to actual user needs, and is not limited to the value in the example above). It obtains the current integrated module working parameters of the corresponding booster integrated module 200 from the connected module-level controllers 210, and comprehensively considers multiple objectives such as power control accuracy, balance of remaining power of booster integrated module, circulation current suppression and minimum power loss. Specifically, based on the multi-objective optimized power allocation strategy, it determines the current power output task corresponding to each booster integrated module 200 and distributes it to the corresponding booster integrated module 200. When the station-level controller 100 determines the current control mode according to the preset control cycle, it specifically collects the current power grid frequency and calculates whether the absolute value of the difference between the current power grid frequency and the rated power grid frequency is greater than a first preset frequency threshold (e.g., set to 0.2Hz; the above value can be flexibly adjusted according to actual user needs and is not limited to the value in the example above). If the absolute value of the difference between the current power grid frequency and the rated power grid frequency is less than or equal to the first preset frequency threshold, the current control mode is determined to be the automatic generation control mode (i.e., AGC mode, where AGC stands for Automatic Generation Control), and the current operating condition can be regarded as a normal operating condition. If the absolute value of the difference between the current power grid frequency and the rated power grid frequency is greater than the first preset frequency threshold, the current control mode is determined to be the automatic voltage control mode (i.e., AVC mode, where AVC stands for Automatic Voltage Control), and the current operating condition can be regarded as a large disturbance operating condition.

[0019] After receiving the current power output task sent by the site-level controller 100, each integrated booster compartment 200 executes the current power output task according to the in-compartment current sharing control strategy, so that the multiple energy storage converters in the integrated booster compartment 200 output power in a current sharing manner.

[0020] This application also provides a station-level multi-compartment collaborative network scheduling and control method. Figure 2 A flowchart illustrating the station-level multi-compartment collaborative network scheduling and control method provided in this application embodiment is shown below. Figure 2 As shown, the station-level multi-compartment collaborative network scheduling and control method is applied to the station-level multi-compartment collaborative network scheduling and control system described in any of the foregoing embodiments. For example... Figure 2 As shown, the station-level multi-compartment collaborative network scheduling and control method includes steps S110 to S120.

[0021] S110, the station-level controller responds to the power intelligent control command generated when the current control mode is determined to be the automatic power generation control mode according to the preset control cycle, obtains the current integrated module operating parameters of the corresponding booster module from the connected module-level controllers, and determines the current power output task corresponding to each booster module based on the preset multi-objective optimized power allocation strategy and distributes it to the corresponding booster module.

[0022] In this embodiment, please continue to refer to Figure 1 As described above, after the initialization and power-on of the station-level multi-module collaborative network scheduling control system is completed, the station-level controller 100 responds to the power intelligent control command generated when the current control mode is determined to be the automatic power generation control mode according to the preset control cycle (e.g., set to 10ms, the above value can be flexibly adjusted according to actual user needs and is not limited to the value in the example above). It obtains the current integrated module working parameters of the corresponding booster integrated module 200 from the connected module-level controllers 210. Taking into account multiple objectives such as power control accuracy, balance of remaining power of booster integrated module, circulation current suppression and minimum power loss, it specifically determines the current power output task corresponding to each booster integrated module 200 based on the multi-objective optimized power allocation strategy and distributes it to the corresponding booster integrated module 200. When the station-level controller 100 determines the current control mode according to a preset control cycle, it specifically collects the current grid frequency and calculates whether the absolute value of the difference between the current grid frequency and the rated grid frequency is greater than a first preset frequency threshold (e.g., set to 0.2Hz). If the absolute value of the difference between the current grid frequency and the rated grid frequency is less than or equal to the first preset frequency threshold, the current control mode is determined to be an automatic generation control mode; if the absolute value of the difference between the current grid frequency and the rated grid frequency is greater than the first preset frequency threshold, the current control mode is determined to be an automatic voltage control mode.

[0023] In one embodiment, such as Figure 3 As shown, the procedure before step S110 also includes: S101, the station-level controller responds to the initial power-on command, and when it is determined that each connected integrated booster compartment has completed the equipment initialization self-test and the self-test is successful, it obtains the number of online energy storage converters in each integrated booster compartment, and determines the corresponding model of each integrated booster compartment according to the preset mapping relationship between the number of energy storage converters and the model. S102. The station-level controller determines the total power capacity of the energy storage power station, the total number of online booster modules, and the total number of online energy storage converters based on the model of each connected booster module and the number of online energy storage converters. S103. The station-level controller aligns its clock with each online pressurization module through a preset clock alignment protocol, and enters the corresponding operating mode based on the currently acquired operating mode information after successful clock alignment.

[0024] In this embodiment, refer to Figure 1 When the system is powered on, the site-level controller 100 automatically identifies the number of online energy storage converters in each of the multiple integrated booster modules connected to it, and loads the corresponding control parameter set, thereby enabling the mixed networking of booster modules of different sizes. The specific process is as follows: each booster module first performs a self-test to determine whether the energy storage converters and other components within the booster module can be powered on and operated normally, and whether they can communicate normally. If the booster module fails to perform a self-test, the site-level controller 100 reports an alarm message to the corresponding receiving terminal and does not start the system. After a booster module completes its self-test, passes the self-test, and starts up initially, the site-level controller 100 scans the online status of each booster module and sequentially reads the number of online energy storage converters in each booster module. The site-level controller 100 scans each booster module with a 100ms scan cycle (the scan cycle value can be flexibly adjusted according to actual user needs and is not limited to the value in the example above). A scan is considered successful only if the site-level controller 100 detects the same number of online energy storage converters in the same booster module three consecutive times. If the site-level controller 100 reads... If the number of online energy storage converters in the integrated booster compartment is 12, it is marked as a small-compartment integrated booster compartment. If the site-level controller 100 reads that the number of online energy storage converters in the integrated booster compartment is 24, it is marked as a large-compartment integrated booster compartment. If the site-level controller 100 reads that the number of online energy storage converters in the integrated booster compartment is neither 12 nor 24, it is marked as a custom capacity integrated booster compartment. After the site-level controller 100 traverses and reads the model of each connected integrated booster compartment and the number of online energy storage converters, it can statistically calculate the energy storage power station. The total capacity and the total number of online energy storage converters are calculated. After completing the above statistics, the entire station time synchronization is initiated to ensure clock alignment of all devices. For example, the station-level controller 100 achieves full station time synchronization with each booster module through the PTP precision time protocol. When the clock error between the station-level controller 100 and any two booster modules does not exceed 1 microsecond, the clock alignment is considered successful. If clock alignment fails, it can be retried up to three times; otherwise, if it exceeds three times, it is considered a clock alignment failure, and the subsequent process is stopped. A clock alignment failure prompt message is generated and sent to the corresponding receiving terminal through the connected communication module. After successful clock alignment, the entire system can select an operating mode, such as normal operating mode, grid-connected mode, or black start mode. Once the operating mode is selected, the corresponding operating mode is started.

[0025] In one embodiment, such as Figure 4 As shown, step S103, which involves entering the corresponding operating mode based on the currently acquired operating mode information, includes: S1031. If it is determined that the current operating mode is black start mode, the current remaining power percentage value and current DC voltage of each connected booster compartment are obtained, and if it is determined that the current remaining power percentage value of each booster compartment is greater than the first preset remaining power percentage threshold, and the current DC voltage is within the first preset voltage range, the black start condition is satisfied. S1032. If it is determined that the black start condition is met, then select one large-sized integrated pressurization module from among the connected integrated pressurization modules as the current main module. S1033. Control one of the currently selected energy storage converters in the current main cabin to start according to the preset network configuration mode, and establish preset phase voltage, preset frequency and preset virtual inertia according to the voltage of the three-phase AC bus. S1034. If it is determined that the selected energy storage converter in the current main compartment has been successfully started and the phase voltage has been successfully established, then control the other energy storage converters in the current main compartment, except for the selected energy storage converter, to perform synchronous operation until all online energy storage converters in the current main compartment have successfully performed synchronous operation. S1035. Control all integrated booster compartments except the current main compartment to perform synchronous operation until all integrated booster compartments are successfully synchronized. Then, connect the booster transformers in each integrated booster compartment to the power grid line in sequence through the oil-immersed main transformer and the GIS switch cabinet to complete the line synchronization and grid connection operation. S1036. If it is determined that the load of the power grid connection meets the preset load conditions, then the black start is completed and the system is switched to normal operation mode.

[0026] In this embodiment, under black-start mode, it is necessary to first determine whether the current remaining power percentage of each booster module connected to the station-level controller is greater than a first preset remaining power percentage threshold (e.g., set to 30%, the above value can be flexibly adjusted according to actual user needs and is not limited to the value in the example above), and simultaneously determine whether the current DC voltage is within a first preset voltage range (e.g., set to 1164V~1456V, the above value range can be flexibly adjusted according to actual user needs and is not limited to the value range in the example above). It is also possible to obtain the current ambient temperature and determine whether the current ambient temperature is within a first ambient temperature range (e.g., set to -10℃~45℃, the above value range can be flexibly adjusted according to actual user needs and is not limited to the value range in the example above). When it is determined that the current remaining power percentage of each booster module is greater than the first preset remaining power percentage threshold, and the current DC voltage is within the first preset voltage range (in specific implementations, it can also be set that the current ambient temperature is within the first ambient temperature range), then the black-start condition is deemed met. If the black start conditions are not met, the black start will be terminated directly, and the current remaining power percentage, current DC voltage, and current ambient temperature of each booster compartment will be reported as black start abnormal parameters.

[0027] Once the black start conditions are met, one large-sized booster module is selected from among the booster modules connected to the site-level controller as the current master module. The selection process prioritizes large-sized booster modules; if multiple large-sized booster modules exist, the one with the largest remaining power percentage is selected as the master module to ensure maximum initial inertia. If all booster modules connected to the site-level controller are small-sized booster modules, the one with the largest remaining power percentage is selected as the master module. If no master module can be selected, the black start process terminates. Prioritizing large-sized booster modules facilitates more stable pressurization, ensures sufficient power during the black start process, and provides stronger anti-interference capabilities.

[0028] If the current main compartment is successfully selected, not all of its energy storage converters will be started immediately. Instead, one energy storage converter will be started as the currently selected energy storage converter according to a preset network configuration mode. For example, the preset network configuration mode is VSG mode (VSG stands for Virtual Synchronous Generator), which establishes a three-phase AC bus with a voltage of 690V, so that the preset phase voltage is 315V, the preset frequency is 50Hz, and the preset virtual inertia J=20kg•m. 2If the above pressure building process fails, it will be retried up to 3 times, with a 2-second interval between each retry. After all 3 retries fail, the black boot will be terminated.

[0029] If the selected energy storage converter in the current main compartment is successfully started and the phase voltage is successfully established, then synchronization operation can continue for other energy storage converters in the current main compartment besides the currently selected one. Synchronization operation can be understood as synchronous grid connection operation. For example, synchronization operation can be performed sequentially with a 5-second interval between each energy storage converter. After the previous energy storage converter completes its synchronization operation, subsequent energy storage converters must meet the following conditions for quasi-synchronization operation: frequency difference with the previous energy storage converter less than 0.1Hz, voltage difference less than 2% (approximately 14V), angle difference less than 5°, and inrush current less than 1.5 times the rated current (approximately 260A). If the synchronization operation of a single energy storage converter fails, that energy storage converter is automatically isolated, and the synchronization operation continues for the next energy storage converter. When the cumulative number of energy storage converters with failed synchronization operations exceeds 3, the black start is terminated. In the above process, when multiple energy storage converters operate synchronously, the frequency difference, voltage difference, and angle difference on both sides are first adjusted by frequency and voltage regulation to meet the above conditions, and then the corresponding energy storage converters are closed. The resulting inrush current is less than 1.5 times the rated current, and will not cause impact to the energy storage converters and damage the equipment.

[0030] After confirming the successful synchronization of all online energy storage converters in the current main compartment, synchronization operations can be performed on references to other integrated booster modules connected to the station-level controller, excluding the current main compartment, until all integrated booster modules are successfully synchronized. However, synchronizing references to other integrated booster modules connected to the station-level controller is not a straightforward process without any prerequisites. Instead, the main compartment's booster transformer must be charged sequentially, and the 35kV bus voltage established before synchronizing references to other integrated booster modules. After completing the synchronization operations on all integrated booster modules connected to the station-level controller, the grid lines connected to the booster transformers in each integrated booster module are sequentially synchronized via oil-immersed main transformers and GIS switchgear.

[0031] After completing the grid synchronization operation, the auxiliary power supply for the energy storage power station can be supplied. This can be done sequentially in multiple steps, such as activating the station's UPS (Uninterruptible Power Supply), air conditioning, lighting system, and auxiliary power supply. The power supply interval between each step can be set to 2 seconds or other time interval values. If power supply to any of the aforementioned loads fails, it will automatically skip the current load and supply power to the next load. Furthermore, the load can be gradually increased in 20% increments or new energy sources can be integrated into the grid, with each step stabilizing for 30 seconds and the frequency change not exceeding 0.2Hz. During this step-by-step load-bearing process, if the frequency of the grid connected to the energy storage power station drops by more than 0.5Hz, the load increase will be paused, and power supply to the load will resume only after stabilization. After supplying power to all loads in the energy storage power station's auxiliary power supply system, and after performing step-by-step load-bearing operations by gradually increasing the load or integrating new energy sources into the grid in 20% increments, with each step stabilizing for 30 seconds and the frequency variation not exceeding 0.2Hz, the preset load conditions are deemed met, and the black start is considered complete. The black start process then needs to be terminated and the system switched to normal operation mode. Throughout the entire black start process, the grid-connected operation mode is maintained, without switching to grid-following mode. Immediately after grid connection, it provides inertia support to the grid without requiring mode switching time.

[0032] In one embodiment, such as Figure 5 As shown, step S1035 includes: S10351. Control the current main cabin to establish a bus voltage with a preset voltage value through a step-up transformer; S10352. Control all connected pressurized integrated modules except the current main module to perform synchronous operation until all pressurized integrated modules successfully perform synchronous operation. S10353. If it is determined that all connected integrated booster compartments are in a grid-stabilized voltage state, the oil-immersed main transformers connected to the collector lines of all booster transformers in the integrated booster compartments will be charged, and the line synchronous grid connection operation will be completed when the lines in the power grid connected to the oil-immersed main transformers through the GIS switch cabinet meet the preset grid connection conditions.

[0033] In this embodiment, the current main cabin is controlled to establish a bus voltage with a preset value through a step-up transformer. Specifically, the low-voltage side switch of the step-up transformer is closed to activate the inrush current suppression device, limiting the inrush current on the low-voltage side of the step-up transformer to within 3 times the rated current (approximately 520A). During the aforementioned step-up transformer charging process, if the inrush current exceeds 5 times the rated current, the circuit breaker is tripped for a retry, and the black start is terminated after at most two failed retry attempts.

[0034] After completing the step-up charging process on the step-up transformer, a bus voltage with a preset voltage value (e.g., 35kV) is established on the step-up transformer in the current main compartment. Once the 35kV three-phase voltage on the step-up transformer is checked to be balanced, the negative sequence voltage is less than 2%, and the zero sequence voltage is less than 1%, the establishment of the bus voltage is considered successful. Then, all connected step-up integrated compartments (excluding the current main compartment) are synchronized in descending order of their current power capacity to connect to the 35kV collector line until all step-up integrated compartments have successfully completed the synchronization operation. During this process, the time interval between two adjacent step-up integrated compartments synchronizing with the 35kV collector line must be greater than or equal to 3 seconds, and the frequency difference between two adjacent synchronized step-up integrated compartments must be less than 0.2Hz, the voltage difference less than 5%, and the angle difference less than 10°. If a single booster module fails to synchronize, that booster module is isolated, and synchronization is performed on the next booster module. If the cumulative number of failed synchronization operations exceeds one-third of the total number of booster modules connected to the station-level controller, the black start is terminated.

[0035] If it is determined that all connected integrated booster compartments are in a grid-connected voltage stabilization state, that is, all online energy storage converters in each integrated booster compartment are in parallel operation, the frequency of each energy storage converter is stable within the range of 50±0.1Hz, the voltage of the energy storage converter is stable within the range of ±2% of its rated voltage and there is no power oscillation, then it is determined that the whole-station grid-connected voltage stabilization operation has been completed and the synchronous operation of all integrated booster compartments has been completed.

[0036] In the process of synchronizing with the 35kV collector line in descending order of current power capacity among the various booster integrated modules connected to the above control system, except for the current main module, the difference between the synchronizing time of the large module booster integrated module and the synchronizing time of the small module booster integrated module is set to at least 60s. The total synchronizing time of the other booster integrated modules, except for the large and small modules, is automatically calculated based on the actual number of online energy storage converters and does not require manual setting.

[0037] In one embodiment, such as Figure 6 As shown, step S110, which involves determining the current power output task corresponding to each pressurized module based on a preset multi-objective optimized power allocation strategy, includes: S111, Obtain the current total power command and the corresponding current total output power; S112. Obtain the current rated power corresponding to the current integrated cabin operating parameters of each integrated cabin, and determine the initial allocation base power of each integrated cabin based on the ratio of the current rated power of each integrated cabin to the current total output power. S113. Based on the initial allocated base power, current remaining power percentage, current grid connection point voltage amplitude, and rated maximum power of each booster module, and the multi-objective optimized power allocation strategy, determine the current power output task corresponding to each booster module when the target constraints corresponding to the multi-objective optimized power allocation strategy are met.

[0038] In this embodiment, the station-level controller obtains the current total power command corresponding to the current total power output task generated by the user's local settings, or the current total power command sent by other terminals. After parsing the current total power command, it obtains the current total output power. Then, the station-level controller comprehensively considers multiple objectives such as power control accuracy, balance of remaining power in the booster module, circulating current suppression, and minimization of power loss. Specifically, based on a multi-objective optimized power allocation strategy, it determines the current power output task corresponding to each booster module when the target constraints corresponding to the multi-objective optimized power allocation strategy are met, and distributes the task to the corresponding booster module.

[0039] Since the current rated power of each booster module can be determined by multiplying the number of online energy storage converters by the rated power of a single energy storage converter (such as 215 kW in the previous example), when determining the initial allocation base power for each booster module based on the ratio of the current rated power of each booster module to the current total output power, the current rated power of each booster module is first summed to obtain the current total rated power. Then, the current rated power of each booster module is divided by the current total rated power and multiplied by the current total output power, which quickly determines the initial allocation base power corresponding to each booster module.

[0040] In one embodiment, such as Figure 7 As shown, step S113 includes: S1131. Determine the current average remaining power percentage value based on the current remaining power percentage value of each booster module and the current rated total capacity, and determine the current first corrected allocation power of each booster module based on the difference between the current remaining power percentage value of each booster module and the current average remaining power percentage value, the preset remaining power balancing coefficient and the initial allocation base power. S1132. Determine the current average grid connection point voltage amplitude based on the current grid connection point voltage amplitude of each integrated booster module, and determine the current second correction allocation power of each integrated booster module based on the difference between the current grid connection point voltage amplitude of each integrated booster module and the current average grid connection point voltage amplitude, the preset circulating current suppression coefficient and the current first correction allocation power. S1133. If it is determined that the current second corrected allocation power of each booster module does not exceed the corresponding current rated power and the sum of the current second corrected allocation power of each booster module is equal to the current total output power, then the current total output power, the current second corrected allocation power of each booster module, the current remaining power percentage, the current rated total capacity, the current grid connection point voltage amplitude, and the current average remaining power percentage are input as parameters to the multi-objective optimization constraint function corresponding to the multi-objective optimization power allocation strategy to obtain the current multi-objective optimization constraint function output value. When the current multi-objective optimization constraint function output value is determined to be the minimum value, it is determined that the target constraint condition corresponding to the multi-objective optimization power allocation strategy is satisfied, and the current second corrected allocation power of each booster module is taken as the corresponding current power output task.

[0041] In this embodiment, if the current total output power is represented by Ptotal, and the entire energy storage power station is equipped with n booster modules (n is a positive integer), then the current remaining percentage of energy storage battery packs connected to the i-th booster module (i ranges from 1 to n and is a positive integer) can be represented by SOC. i The initial allocation of base power can be represented by P. i_0 Indicates that the current first corrected power allocation is available in P. i_1 This indicates that the current second corrected power allocation is available in P. i_2 Indicates that the current rated power is available in P. rated_i This indicates that the rated total energy of all energy storage battery packs connected to the i-th booster module is available in E. rated_i The current grid connection point voltage amplitude can be represented by U. i This indicates that the initial allocated base power P of the i-th pressurized module is... i_0 =Ptotal×P rated_i The sum of the current rated power of all booster compartments, and the current average remaining power percentage (SOC). avg =The sum of the current remaining percentage of energy storage battery packs connected to each booster module in all booster modules, multiplied by the rated total energy of all energy storage battery packs connected to the corresponding booster module, and then divided by the sum of the rated total energy of all energy storage battery packs connected to all booster modules. This represents the current first corrected power allocation P of the i-th booster module. i_1 =k soc × (SOC) i -SOC avg )×(1+P i_0 (where k) soc This represents the preset remaining power balancing coefficient, with a value ranging from 0.1 to 0.3 and a preferred value of 0.2), and the current average grid connection point voltage amplitude U. avg=Sum of the current grid connection point voltage amplitudes of all booster modules / n, the current second corrected power distribution P of the i-th booster module. i_2 =-k cir ×(U i -U avg )+P i_1 (where k) cir This represents the preset circulation suppression coefficient, which ranges from 0.5 to 2, with a preferred value of 1.

[0042] After confirming that the current second corrected power allocation of each booster module does not exceed its corresponding current rated power, the current total output power, the current second corrected power allocation of each booster module, the current remaining power percentage, the current rated total capacity, the current grid connection point voltage amplitude, and the current average remaining power percentage are input as parameters to the multi-objective optimization constraint function corresponding to the multi-objective optimized power allocation strategy. When obtaining the current multi-objective optimization constraint function output value, the following four objective sub-functions are specifically calculated: The first objective sub-function is f1 and equal to |the current second corrected power allocation of all booster modules. The sum of the second corrected power allocation - current total output power | / current total output power; the second objective sub-function is f2, which is equal to the difference between the maximum and minimum current remaining power percentage values ​​in all booster modules; the third objective sub-function is f3, which is equal to the sum of the absolute values ​​of the differences between the current grid connection point voltage amplitude and the current average grid connection point voltage amplitude of each booster module / current average grid connection point voltage amplitude; the fourth objective sub-function is f4, which is equal to the sum of the squares of the current second corrected power allocation of each booster module divided by the squares of the current rated power of each booster module. Then, when calculating the current multi-objective optimization constraint function output value corresponding to the multi-objective optimization constraint function, specifically, minF = w1×f1 + w2×f2 + w3×f3 + w4×f4 (where w1, w2, w3, and w4 are the preset first, second, third, and fourth weight values, respectively).

[0043] If it is determined that the current second corrected allocation power of a booster compartment exceeds its corresponding current rated power, then the current second corrected allocation power of that booster compartment needs to be set to equal its current rated power, and the excess power difference is allocated to other booster compartments that have not reached their power limit according to the capacity ratio. This check is repeated until the current second corrected allocation power of all booster compartments does not exceed their corresponding current rated power.

[0044] S120. For each of the multiple integrated booster modules that are communicatively connected to the site-level controller, the booster module receives the current power output task sent by the site-level controller, and executes the current power output task according to the preset in-module current sharing control strategy, so that the multiple energy storage converters in the booster module output power in a current sharing manner.

[0045] In this embodiment, for each of the multiple integrated booster modules that are communicatively connected to the site-level controller, taking one integrated booster module as an example, after the module-level controller of the integrated booster module receives the current power output task, it controls and executes the current power output task according to the preset in-module current sharing control cycle (such as 1ms, which can be flexibly adjusted according to actual user needs and is not limited to the value in the example above) according to the in-module current sharing control strategy, so as to ensure that the power of each online energy storage converter in the module is evenly distributed.

[0046] In one embodiment, such as Figure 8 As shown, step S120 involves controlling the execution of the current power output task for a single booster cabin based on a preset cabin flow sharing control strategy, including: S121. Obtain the current actual output power of the energy storage converter in each online state in the booster integrated cabin according to the preset cabin flow sharing control cycle, and obtain the current average actual output power accordingly. S122. Obtain the current output power deviation value between the current actual output power and the current average actual output power of each online energy storage converter in the booster integrated cabin; S123. For each energy storage converter, based on the current output power deviation value, the preset virtual impedance fine-tuning strategy, and the preset zero-sequence voltage injection strategy, determine the current virtual impedance adjustment value and the current zero-sequence voltage correction amount of the energy storage converter and adjust them accordingly, so that each energy storage converter in the booster integrated cabin outputs power in a current sharing manner.

[0047] In this embodiment, referring to the above example, taking one of the integrated booster compartments as an example, after the compartment controller of the integrated booster compartment receives the current power output task, it obtains the current actual output power of each online energy storage converter in the integrated booster compartment according to the preset compartment current sharing control cycle of 1ms, and performs an average calculation to determine the current average actual output power. It can also accurately determine the current output power deviation value between the current actual output power of each online energy storage converter and the current average actual output power.

[0048] Taking the current virtual impedance adjustment and current zero-sequence voltage correction process of one of the energy storage converters as an example, if the current output power deviation value of the energy storage converter is determined to be greater than 0, it means that the output power is too large and the virtual impedance needs to be increased; if the current output power deviation value of the energy storage converter is determined to be equal to 0, it means that no adjustment is needed at present; if the current output power deviation value of the energy storage converter is determined to be less than 0, it means that the output power is too small and the virtual impedance needs to be decreased.

[0049] More specifically, if the current output power deviation of the energy storage converter is determined to be greater than 0, then when adjusting its current virtual impedance according to the virtual impedance fine-tuning strategy, the current virtual impedance adjustment value of the energy storage converter is gradually increased by a preset single-cycle adjustment step size of 0.001pu, and the virtual impedance adjustment range is limited to 0.02pu~0.1pu; if the current output power deviation of the energy storage converter is determined to be less than 0, then when adjusting its current virtual impedance according to the virtual impedance fine-tuning strategy, the current virtual impedance adjustment value of the energy storage converter is gradually decreased by a preset single-cycle adjustment step size of 0.001pu, and the virtual impedance adjustment range is limited to 0.02pu~0.1pu. When adjusting the current virtual impedance of the energy storage converter, it is also necessary to obtain the zero-sequence current value of the energy storage converter and generate a zero-sequence voltage correction amount corresponding to the energy storage converter based on the preset PI controller (which deploys a zero-sequence voltage injection strategy) in the cabin controller of the energy storage converter. This is to achieve the averaging of the zero-sequence current value of the energy storage converter with the zero-sequence current values ​​of other energy storage converters in the same booster cabin. During the above adjustment process, in order to prevent parallel oscillation caused by power surges, it can be limited that the power change of the energy storage converter during each current virtual impedance adjustment and current zero-sequence voltage correction cannot exceed 5% of its power (for example, 5% of 215 kW, or 10.75 kW).

[0050] In one embodiment, the method further includes the following after step S120: If it is determined that the station-level controller is faulty or that the scheduling communication between it and all connected integrated booster pods is interrupted, and all integrated booster pods are not in a communication network abnormal state, then the control enters the preset first-level autonomous mode. The pod-level controllers of the multiple integrated booster pods that are connected to the station-level controller output power in a flow-sharing manner according to the first-level autonomous mode and the latest power output task received. If it is determined that there is an abnormal communication network state in the booster compartment, the corresponding booster compartment is controlled to enter the preset secondary autonomous mode, and each online energy storage converter in the booster compartment is controlled to automatically switch to the preset peer droop control mode to output power according to the secondary autonomous mode. If it is determined that the energy storage converter in the booster compartment has an abnormal communication network state, the corresponding booster compartment is controlled to enter a preset three-level autonomous mode. According to the three-level autonomous mode, the energy storage converter in the booster compartment with an abnormal communication network state is set to a safe exit state, and other online energy storage converters provide output power compensation to ensure that the booster compartment completes power output according to the current power output task.

[0051] In this embodiment, a three-level communication redundancy mechanism is constructed to automatically degrade to the corresponding autonomous mode in the event of communication failures under different circumstances, thus avoiding a complete station outage. Specifically, the station-level controller communicates with the cabin-level controller within the integrated booster compartment via a dual-redundant gigabit industrial Ethernet network using PRP (Parallel Redundancy Protocol, such as IEC62439-3). The station-level controller can simultaneously send the same data to the cabin-level controller via the dual-redundant gigabit industrial Ethernet network, and the cabin-level controller, as the data receiver, selects the first data packet received. Each cabin-level controller within the integrated booster compartment communicates with each energy storage converter within the compartment via the EtherCAT (Ethernet for Control Automation Technology) communication protocol. Specifically, a ring network topology and cable redundancy can be adopted. When a single node corresponding to a single energy storage converter in the ring network fails, the entire ring network automatically reconstructs within 10ms, and messages automatically bypass the failed node without affecting the communication of other nodes. Each energy storage converter within the integrated booster compartment has its internal controller directly connected to IGBT drivers (IGBT stands for Insulated Gate Bipolar Transistor), voltage and current sensors, and a BMS (Battery Management System) via dual CAN buses and fiber optic cables. Hardware watchdogs can also be configured in all these communication links; if a device fails to receive data within a timeout period, it automatically enters the corresponding autonomous state without software intervention.

[0052] Specifically, if it is determined that the site-level controller is faulty or that scheduling communication with all connected integrated booster modules is interrupted, the current fault level can be determined as a Level 1 fault. In this case, scheduling communication between the site-level controller and all connected integrated booster modules is interrupted. Each integrated booster module's module-level controller outputs power in a current-sharing manner according to the Level 1 autonomous mode and the latest received power output task. The modules autonomously synchronize current sharing through the 35kV bus voltage frequency, continuing to provide grid support and primary frequency regulation. In Level 1 autonomous mode, the normal power supply function, primary frequency regulation, and inertia support of the integrated booster modules are not affected, but they cannot receive new current power output tasks sent by the site-level controller. If the site-level controller is not faulty and scheduling communication with all connected integrated booster modules is restored, it automatically switches back to normal mode and exits Level 1 autonomous mode. In specific implementation, the maximum duration of Level 1 autonomous mode can be set to be greater than 2 hours (and can also be limited to no more than one day), allowing users sufficient time to troubleshoot the site-level controller in the energy storage power station to re-enter normal mode.

[0053] If a communication network anomaly is confirmed in a booster compartment, the current fault level can be determined as a Level 2 fault. In this case, all energy storage converters in the booster compartment automatically switch to a peer-to-peer droop control mode, autonomously sharing current and operating in parallel based on locally detected voltage and frequency, without requiring specific control commands from the compartment controller. Once the compartment controller recovers, it automatically switches back to normal current sharing mode.

[0054] If it is determined that the energy storage converter in the integrated booster compartment has a communication network abnormality (possibly caused by a CAN bus fault between it and the compartment controller; CAN stands for Controller Area Network), then the current fault level can be determined as a level three fault. In this case, the corresponding integrated booster compartment is controlled to enter a preset level three autonomous mode. Based on this mode, the energy storage converter in the integrated booster compartment with the communication network abnormality is set to a safe exit state, and hardware overcurrent protection is triggered so that other online energy storage converters can compensate for their output power within 1ms to ensure the integrated booster compartment completes its power output according to the current power output task. Furthermore, once communication with the energy storage converter with the abnormal communication network is restored, it automatically performs operations to complete the connection, and all online energy storage converters connected to the compartment controller exit the hardware overcurrent protection state.

[0055] In one embodiment, the method further includes the following after step S120: The station-level controller responds to the inertia priority control command generated when the current control mode is determined to be automatic voltage control mode according to a preset control cycle, obtains the current virtual inertia power and current primary frequency modulation power of each connected integrated booster cabin, and sums them to determine the corresponding current support power; If it is determined that the sum of the output power corresponding to the current power output task of the booster compartment and the current support power is less than or equal to the product of the preset adjustment ratio and the current rated power, then the sum of the output power corresponding to the current power output task of the booster compartment and the current support power shall be used as the current reference power of the booster compartment. If it is determined that the current remaining power percentage value of the booster compartment in the power output of the current reference power belongs to the preset remaining power percentage value threshold range, then power support is performed according to the current reference power.

[0056] In this embodiment, when the station-level controller determines the current control mode according to a preset control cycle, if the absolute value of the difference between the current grid frequency and the rated grid frequency is greater than the first preset frequency threshold, the current control mode is determined to be the automatic voltage control mode. At this time, the current operating condition is regarded as a large disturbance operating condition, and the corresponding processing priority of virtual inertia and primary frequency regulation priority needs to be automatically increased to prioritize the frequency support of the grid. In the power intelligent control command corresponding to the automatic generation control mode, the change rate of the command is limited, such as limiting the change rate to no more than 10% within one second.

[0057] Specifically, in response to the inertia priority control command, the station-level controller acquires the current virtual inertia power and current primary frequency regulation power of each connected integrated booster module, and sums them to determine the corresponding current support power. The current virtual inertia power of each integrated booster module is obtained by summing the current virtual inertia power of all online energy storage converters within it (the current virtual inertia power of a single energy storage converter is equal to the product of the preset virtual inertia of that energy storage converter and the frequency change rate of the grid multiplied by -1; the preset virtual inertia of a single energy storage converter ranges from 5 to 40 kg•m). 2 And the optimal value is 20 kg•m 2 The current primary frequency regulation power of each booster integrated module is obtained by summing the current primary frequency regulation power of all online energy storage converters (the current primary frequency regulation power of a single energy storage converter is equal to the current grid frequency and the absolute value of the difference between the current grid frequency and the rated grid frequency, multiplied by the preset primary frequency regulation coefficient of the energy storage converter, and then multiplied by -1. The preset primary frequency regulation coefficient of a single energy storage converter ranges from 20 to 50 kW / Hz, and the preferred value is 32 kW / Hz).

[0058] If it is determined that the sum of the output power corresponding to the current power output task of the booster module and the current support power is less than or equal to the product of the preset adjustment ratio (e.g., set to 0.8, which can be flexibly adjusted according to actual user needs and is not limited to the value in the example above) and the current rated power, it indicates that the reserved power of the booster module can be used as a backup for inertia adjustment and primary frequency regulation. At this time, it is necessary to further determine whether the relevant processing of virtual inertia and primary frequency regulation through the reserved power of the booster module will cause the current remaining power percentage value of the booster module in the power output of the current reference power to not fall within the preset remaining power percentage value threshold range (e.g., the current remaining power percentage value is greater than 90% or less than 10%, which can be regarded as not falling within the preset remaining power percentage value threshold range). If it is determined that the current remaining power percentage value of the booster module in the power output of the current reference power falls within the preset remaining power percentage value threshold range, it indicates that the relevant processing of virtual inertia and primary frequency regulation through the reserved power of the booster module will not cause its current remaining power percentage value to be abnormal, and power support can be directly performed according to the current reference power. The above methods also achieve equipment safety protection for the energy storage converter.

[0059] Of course, if the sum of the output power corresponding to the current power output task of the booster module and the current support power is greater than the product of the preset adjustment ratio and the current rated power, it means that the reserved power of the booster module is insufficient for inertia adjustment and primary frequency regulation. In this case, the product of the preset adjustment ratio and the current rated power needs to be used as the current reference power of the booster module. Then, it is determined whether the current remaining power percentage value corresponding to the power output of the booster module at the current reference power falls within a preset remaining power percentage threshold range. Only if the current remaining power percentage value corresponding to the power output of the booster module at the current reference power falls within the preset remaining power percentage threshold range will power support be performed according to the current reference power. Similarly, this also achieves equipment safety protection for the energy storage converter.

[0060] In one embodiment, the method further includes the following after step S120: The station-level controller continuously acquires the current fault status when each booster module performs the current power output task; If it is determined that the current fault state is not empty, the current fault level corresponding to the current fault state is obtained, and the corresponding target fault handling strategy is executed according to the current fault level.

[0061] In this embodiment, the station-level controller can continuously acquire the current fault status of each booster module when it performs the current power output task to determine whether a fault exists. If the current fault status is determined to be non-empty, it indicates that at least one device (such as the device in the module controller 210, transformer equipment group 220, and energy storage battery group 230) in the entire station-level multi-module collaborative network scheduling system is faulty. It is necessary to determine its specific current fault level and execute the corresponding target fault handling strategy according to the current fault level.

[0062] Specifically, if it is determined that a sensor (such as a temperature sensor) in the transformer equipment group 220 or the energy storage battery group 230 is abnormal, the current fault status is composed of the device number of the sensor plus the corresponding abnormal identification string. The current fault level can be obtained as the first fault level according to the current fault status. At this time, the target fault handling strategy corresponding to the first fault level is to report the alarm prompt information for the sensor without interrupting the operation, and record the fault log and fault time in the alarm prompt information.

[0063] If it is determined that a certain energy storage converter or a certain energy storage battery cluster in the transformer equipment group 220 or energy storage battery group 230 is abnormal, the current fault status is composed of the equipment number of the energy storage converter or energy storage battery cluster plus the corresponding abnormal identification string. The current fault level can be obtained as the second fault level according to the current fault status. At this time, the target fault handling strategy corresponding to the second fault level is to automatically isolate and exit the faulty equipment and automatically compensate the power of other equipment within 1ms. At the same time, the system operates at a reduced rate and ensures that the reduction does not exceed 5%.

[0064] If it is determined that a short circuit has occurred in the booster compartment, the booster transformer has failed, or a certain energy storage battery cluster has thermal runaway, the current fault status is composed of the equipment number of the faulty equipment plus the corresponding abnormal identification string. The current fault level can be obtained as the third fault level based on the current fault status. At this time, the target fault handling strategy corresponding to the third fault level is to quickly disconnect the booster compartment that has failed, keep other booster compartments running normally to ensure power supply to important loads, and at the same time activate the fire alarm.

[0065] If a short circuit is confirmed in the three-phase AC busbar, a fault in the collector line, or a serious natural disaster in the energy storage power station, the current fault status is composed of the equipment number of the faulty equipment plus the corresponding abnormal identification string, or directly composed of the type of natural disaster. The current fault level can be obtained as the fourth fault level based on the current fault status. At this time, the target fault handling strategy corresponding to the fourth fault level is to shut down the entire station urgently, and the hardware triggers the tripping of the grid connection point switch to achieve a safe shutdown, and at the same time activate the fire protection system.

[0066] In summary, this application provides a site-level multi-module collaborative network scheduling control system and method. The method includes: a site-level controller responding to a power intelligent control command generated when the current control mode is determined to be automatic power generation control mode according to a preset control cycle, obtaining the current integrated module operating parameters of the corresponding booster module from each connected module-level controller, and determining the current power output task corresponding to each booster module based on a preset multi-objective optimized power allocation strategy and distributing it to the corresponding booster module; for each of the multiple booster modules communicatively connected to the site-level controller, upon receiving the current power output task sent by the site-level controller, the booster module controls and executes the current power output task based on a preset in-module current sharing control strategy, so that the multiple energy storage converters in the booster module output power in a current sharing manner. This application embodiment can more intelligently allocate the current power output task according to the current integrated module operating parameters of each booster module connected to the site-level controller and the specific model of the booster module, so that it outputs power in a current sharing manner.

[0067] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0068] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is merely a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0069] The steps in the method of this invention can be adjusted, merged, or reduced in order according to actual needs. The units in the device of this invention can be merged, divided, or reduced according to actual needs. Furthermore, the functional units in the various embodiments of this invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0070] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention.

[0071] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A station-level multi-compartment collaborative network scheduling and control system, characterized in that, It includes a station-level controller and multiple integrated booster modules, which correspond to at least two different numbers of parallel energy storage converters; Each of the multiple integrated booster compartments is equipped with a compartment-level controller and a transformer equipment group, and the transformer equipment group is also connected to an energy storage battery pack. The transformer equipment group includes multiple energy storage converters and a boost transformer. The multiple energy storage converters are connected in parallel to a three-phase AC bus. The input terminal of the boost transformer is connected to the three-phase AC bus, and the output terminal of the boost transformer is used to connect to a collector line. The energy storage battery pack includes multiple energy storage battery clusters, each energy storage battery cluster is composed of multiple energy storage batteries connected in series, and each energy storage battery cluster is uniquely connected to one of the multiple energy storage converters. The compartment-level controller is communicatively connected to the station-level controller, and the compartment-level controller is also communicatively connected to the multiple energy storage converters in the transformer equipment group, the boost transformer, and each energy storage battery cluster in the energy storage battery pack. The station-level controller is used to respond to the power intelligent control command generated when the current control mode is determined to be the automatic power generation control mode according to the preset control cycle, obtain the current integrated module working parameters of the corresponding booster module from the connected module-level controllers, and determine the current power output task corresponding to each booster module based on the preset multi-objective optimized power allocation strategy and distribute it to the corresponding booster module. The integrated booster compartment is used to receive the current power output task sent by the site-level controller, and to control and execute the current power output task according to the preset in-compartment current sharing control strategy, so that the multiple energy storage converters in the integrated booster compartment output power in a current sharing manner.

2. The station-level multi-compartment collaborative network scheduling control system according to claim 1, characterized in that, The output of the step-up transformer in the integrated booster compartment is connected to the power grid in sequence through the collector line, the oil-immersed main transformer, and the GIS switch cabinet.

3. A station-level multi-compartment collaborative network scheduling and control method, characterized in that, Applied to the station-level multi-compartment collaborative network scheduling control system as described in any one of claims 1-2; the method includes: The station-level controller responds to the power intelligent control command generated when the current control mode is determined to be the automatic power generation control mode according to the preset control cycle. It obtains the current integrated module operating parameters of the corresponding integrated booster module from the connected module-level controllers, and determines the current power output task corresponding to each integrated booster module based on the preset multi-objective optimized power allocation strategy and distributes it to the corresponding integrated booster module. For each of the multiple integrated booster modules that are communicatively connected to the site-level controller, when the integrated booster module receives the current power output task sent by the site-level controller, it controls and executes the current power output task according to the preset in-module current sharing control strategy, so that the multiple energy storage converters in the integrated booster module output power in a current sharing manner.

4. The method according to claim 3, characterized in that, Before the steps of the station-level controller responding to the power intelligent control command generated when the current control mode is determined to be automatic power generation control mode according to a preset control cycle, obtaining the current integrated module operating parameters of the corresponding booster module from each connected module-level controller, and determining the current power output task corresponding to each booster module based on a preset multi-objective optimized power allocation strategy and distributing it to the corresponding booster module, the method further includes: The station-level controller responds to the initial power-on command and, after confirming that each connected integrated booster compartment has completed its equipment initialization self-test and the self-test is successful, obtains the number of online energy storage converters in each integrated booster compartment and determines the corresponding model of each integrated booster compartment according to the preset mapping relationship between the number of energy storage converters and their models. The site-level controller determines the total power capacity of the energy storage power station, the total number of online booster modules, and the total number of online energy storage converters based on the model of each connected booster module and the number of online energy storage converters. The station-level controller aligns its clock with each online pressurization module via a preset clock alignment protocol, and enters the corresponding operating mode based on the currently acquired operating mode information after successful clock alignment.

5. The method according to claim 4, characterized in that, The step of entering the corresponding operating mode based on the currently acquired operating mode information includes: If the current operating mode is determined to be black start mode, the current remaining power percentage value and current DC voltage of each connected booster compartment are obtained. If the current remaining power percentage value of each booster compartment is greater than the first preset remaining power percentage threshold and the current DC voltage is within the first preset voltage range, the black start condition is determined to be met. If the black start conditions are met, then select one large-sized booster module from among the connected booster modules as the current main module. Control one of the currently selected energy storage converters in the current main cabin to start according to the preset network configuration mode, and establish preset phase voltage, preset frequency and preset virtual inertia according to the voltage of the three-phase AC bus; If it is determined that the selected energy storage converter in the current main compartment has successfully started up and the phase voltage has been successfully established, then control the other energy storage converters in the current main compartment, except for the currently selected energy storage converter, to perform synchronous operation until all online energy storage converters in the current main compartment have successfully performed synchronous operation. The control unit performs synchronous operation on all integrated booster compartments except the current main compartment until all integrated booster compartments successfully complete the synchronous operation. Then, the line synchronous grid connection operation is completed by sequentially connecting the oil-immersed main transformer and the power grid line connected to the grid on the collector line connected to the booster transformer in each integrated booster compartment through the grid line connected to the GIS switch cabinet. If it is determined that the load of the power grid connection meets the preset load conditions, then the black start is completed and the system is switched to normal operation mode.

6. The method according to claim 5, characterized in that, The control unit performs synchronization operations on all integrated booster modules except the current main module until all integrated booster modules successfully synchronize. Then, the power grid lines connected to the collector lines of each integrated booster module are sequentially connected via oil-immersed main transformers and GIS switchgear to complete the line synchronization and grid connection operations, including: The current main cabin is controlled to establish a bus voltage with a preset voltage value through a step-up transformer; The system controls all connected pressurized modules except the current main module to perform synchronous operations until all pressurized modules successfully perform synchronous operations. If it is determined that all connected integrated booster compartments are in a grid-stabilized voltage state, the oil-immersed main transformers connected to the collector lines of all booster transformers in the integrated booster compartments will be charged, and the line synchronous grid connection operation will be completed when the lines in the power grid connected to the oil-immersed main transformers through the GIS switch cabinet meet the preset grid connection conditions.

7. The method according to claim 3, characterized in that, The method for determining the current power output task corresponding to each pressurized integrated module based on a preset multi-objective optimized power allocation strategy includes: Get the current total power command and the corresponding current total output power; Obtain the current rated power corresponding to the current integrated working parameters of each integrated booster module, and determine the initial allocation base power of each integrated booster module based on the ratio of the current rated power of each integrated booster module to the current total output power. Based on the initial allocated base power, current remaining power percentage, current grid connection point voltage amplitude, and rated maximum power of each booster module, and the multi-objective optimized power allocation strategy, the current power output task corresponding to each booster module is determined when the target constraints corresponding to the multi-objective optimized power allocation strategy are met.

8. The method according to claim 7, characterized in that, The process of determining the current power output task corresponding to each booster module based on the initial allocated base power, current remaining power percentage, current grid connection point voltage amplitude, and maximum rated power of each module, as well as the multi-objective optimized power allocation strategy, while satisfying the target constraints corresponding to the multi-objective optimized power allocation strategy, includes: The current average remaining power percentage is determined based on the current remaining power percentage of each booster module and the current rated total capacity. The current first corrected allocation power of each booster module is determined based on the difference between the current remaining power percentage of each booster module and the current average remaining power percentage, the preset remaining power balancing coefficient, and the initial allocation base power. The current average grid connection point voltage amplitude is determined based on the current grid connection point voltage amplitude of each integrated booster module, and the current second correction allocation power of each integrated booster module is determined based on the difference between the current grid connection point voltage amplitude of each integrated booster module and the current average grid connection point voltage amplitude, the preset circulating current suppression coefficient, and the current first correction allocation power. If it is determined that the current second corrected allocation power of each booster module does not exceed the corresponding current rated power and the sum of the current second corrected allocation power of each booster module is equal to the current total output power, then the current total output power, the current second corrected allocation power of each booster module, the current remaining power percentage, the current rated total capacity, the current grid connection point voltage amplitude, and the current average remaining power percentage are input as parameters to the multi-objective optimization constraint function corresponding to the multi-objective optimization power allocation strategy to obtain the current multi-objective optimization constraint function output value. When the current multi-objective optimization constraint function output value is determined to be the minimum value, it is determined that the target constraint condition corresponding to the multi-objective optimization power allocation strategy is satisfied, and the current second corrected allocation power of each booster module is taken as the corresponding current power output task.

9. The method according to claim 3, characterized in that, In the step of addressing each of the multiple integrated booster modules communicatively connected to the site-level controller, after the booster module receives the current power output task sent by the site-level controller and executes the current power output task according to a preset in-module current sharing control strategy, so that the multiple energy storage converters in the booster module output power in a current sharing manner, the method further includes: If it is determined that the station-level controller is faulty or that the scheduling communication between it and all connected integrated booster pods is interrupted, and all integrated booster pods are not in a communication network abnormal state, then the control enters the preset first-level autonomous mode. The pod-level controllers of the multiple integrated booster pods that are connected to the station-level controller output power in a flow-sharing manner according to the first-level autonomous mode and the latest power output task received. If it is determined that there is an abnormal communication network state in the booster compartment, the corresponding booster compartment is controlled to enter the preset secondary autonomous mode, and each online energy storage converter in the booster compartment is controlled to automatically switch to the preset peer droop control mode to output power according to the secondary autonomous mode. If it is determined that the energy storage converter in the booster compartment has an abnormal communication network state, the corresponding booster compartment is controlled to enter a preset three-level autonomous mode. According to the three-level autonomous mode, the energy storage converter in the booster compartment with an abnormal communication network state is set to a safe exit state, and other online energy storage converters provide output power compensation to ensure that the booster compartment completes power output according to the current power output task.

10. The method according to claim 3, characterized in that, The preset in-cabin current sharing control strategy corresponds to the control execution of the current power output task, so that the multiple energy storage converters in the booster cabin output power in a current sharing manner, including: The current actual output power of the energy storage converter in each online state in the booster integrated cabin is obtained according to the preset cabin flow equalization control cycle, and the current average actual output power is obtained accordingly. Obtain the current output power deviation value between the current actual output power and the current average actual output power of each online energy storage converter in the booster integrated cabin; For each energy storage converter, based on the current output power deviation value, the preset virtual impedance fine-tuning strategy, and the preset zero-sequence voltage injection strategy, the current virtual impedance adjustment value and the current zero-sequence voltage correction amount of the energy storage converter are determined and adjusted accordingly, so that each energy storage converter in the booster integrated cabin outputs power in a current sharing manner.

11. The method according to claim 3, characterized in that, In the step of addressing each of the multiple integrated booster modules communicatively connected to the site-level controller, after the booster module receives the current power output task sent by the site-level controller and executes the current power output task according to a preset in-module current sharing control strategy, so that the multiple energy storage converters in the booster module output power in a current sharing manner, the method further includes: The station-level controller responds to the inertia priority control command generated when the current control mode is determined to be automatic voltage control mode according to a preset control cycle, obtains the current virtual inertia power and current primary frequency modulation power of each connected integrated booster cabin, and sums them to determine the corresponding current support power; If it is determined that the sum of the output power corresponding to the current power output task of the booster compartment and the current support power is less than or equal to the product of the preset adjustment ratio and the current rated power, then the sum of the output power corresponding to the current power output task of the booster compartment and the current support power shall be used as the current reference power of the booster compartment. If it is determined that the current remaining power percentage value of the booster compartment in the power output of the current reference power belongs to the preset remaining power percentage value threshold range, then power support is performed according to the current reference power.

12. The method according to claim 3, characterized in that, In the step of addressing each of the multiple integrated booster modules communicatively connected to the site-level controller, after the booster module receives the current power output task sent by the site-level controller and executes the current power output task according to a preset in-module current sharing control strategy, so that the multiple energy storage converters in the booster module output power in a current sharing manner, the method further includes: The station-level controller continuously acquires the current fault status when each booster module performs the current power output task; If it is determined that the current fault state is not empty, the current fault level corresponding to the current fault state is obtained, and the corresponding target fault handling strategy is executed according to the current fault level.

Images