Group scheduling control method and system for PCS energy storage system

Abstract

The invention discloses a group scheduling control method and system for a PCS energy storage system, relates to the technical field of group scheduling of energy storage systems, and solves the technical problems of insufficient SOC balance regulation and control accuracy and weak capacity proportion distribution fault-tolerant capability. The SOH correction coefficient is accurately calculated through the linear relation, it is ensured that the PCS with the high health degree and the large capacity preferentially undertakes the balancing task, the weak health battery is effectively protected, the cycle life of the battery is prolonged, multiple screening constraints of the available PCS are defined, and according to the size relation between the exceeding power and the total redundant power, a capacity proportion or redundant power proportion distribution strategy is adopted, so that the capacity of the PCS is effectively protected. Reasonable power distribution and no equipment overload risk are ensured, the power distribution deviation after the fault of a single PCS can be reduced, and the fault-tolerant response speed of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage system group regulation, in particular to a group regulation control method and system for a PCS energy storage system. BACKGROUND

[0002] With the continuous improvement of new energy power generation penetration, energy storage systems play an increasingly key role in power fluctuation smoothing, auxiliary grid frequency and voltage regulation, and peak-valley arbitrage scenarios. The group regulation control performance of the energy storage converter (PCS) as the core interface device between the energy storage system and the grid directly determines the operation stability, economy and battery life of the entire energy storage system.

[0003] The current PCS energy storage system only relies on the SOC difference to allocate and adjust the amount in the SOC balancing process, which easily leads to weak healthy batteries bearing too much adjustment task and accelerating aging. In power distribution, when the PCS cannot meet the distribution demand due to high temperature / power limitation, it is easy to cause deviation in redundant power calculation or imbalance in distribution, and cause new device overload risk. SUMMARY

[0004] In view of the defects of the prior art, the present application provides a group regulation control method and system for a PCS energy storage system, which solves the problems of insufficient accuracy of SOC balancing regulation and weak fault tolerance ability of capacity proportioning.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: a group regulation control method for a PCS energy storage system, which specifically comprises the following steps: Collect the state of charge of each PCS system, and calculate the state of charge difference of each PCS system by subtracting the average SOC of the system from the SOC of the PCS system, and compare the state of charge difference with the preset state of charge dynamic threshold value; Generate an SOC balancing regulation signal when the state of charge difference is greater than the state of charge dynamic threshold value, and calculate the corresponding state of charge weight according to the battery health state and state of charge of each PCS system, and calculate the total adjustment amount, and regulate the state of charge of each PCS system according to the weight of each PCS system; Generate a capacity proportioning regulation signal when the state of charge difference is less than the state of charge dynamic threshold value, and calculate the capacity proportioning value according to the rated capacity of each PCS system, and monitor the temperature in real time, and generate a secondary distribution signal if the temperature exceeds the temperature threshold value; Process the secondary distribution signal, select all available PCS systems according to the constraint condition, calculate the total redundant power and excess power of all available PCS systems, and distribute according to the rated capacity proportion of the available PCS system when the excess power is greater than the total redundant power, and vice versa.

[0006] As a further scheme of the present application, the calculation method of the battery state of health is: Obtain the battery state of health SOH of each PCS system; Establish the correction relationship k of the battery state of health SOH SOH =a×SOH+b, wherein a, b are calibrated k according to different situations of SOH SOH The obtained correction coefficient.

[0007] As a further scheme of the present application, the calculation method of the total adjustment amount of the system is: According to the formula The weight W corresponding to the PCS system is calculated i , and C i is the battery capacity corresponding to the PCS system i, wherein represents the capacity proportion corresponding to the PCS system, represents the state of charge difference value of the PCS system; according to the formula The total adjustment amount P is calculated 总调量 , P 基础 represents the basic adjustment power, which is a preset proportion of the system rated power, k scale represents the scaling coefficient, represents the total state of charge difference value, S th represents the dynamic threshold value.

[0008] As a further scheme of the present application, the method of regulating according to the weight of each PCS system is: According to the calculated weight W i Adjust according to the corresponding discharge or charge condition, for the discharge group adjustment, according to the formula The corresponding discharge amount is calculated, and the corresponding charge amount of the charge group is calculated, and the corresponding SOC equalization regulation information is generated.

[0009] As a further scheme of the present application, the method of generating a secondary distribution signal is: Obtain the current total active demand P total And the rated capacity Cn, according to the formula The capacity proportion distribution value P fault is calculated, wherein The rated capacity sum of all capacity proportion distribution PCS systems is Then compare the real-time temperature of the battery cell with the pre-set temperature threshold value, if the real-time temperature is greater than the temperature threshold value, generate a secondary distribution signal.

[0010] As a further scheme of the present application, the method of processing the secondary distribution signal is: Calculate the total redundant power and excess power of all available PCS systems. ,and =P fault -Pmax fault , where Pmax fault This represents the maximum permissible power under temperature limitations, according to the formula... The total redundant power P is calculated. 总余 , where P current，o Indicates the current output power; If the power is exceeded ≥ Total Redundant Power P 总余 Calculate the capacity percentage r of the available PCS system o. o = ,in This represents the total capacity of all available PCS systems, and is based on the formula... = ×r o Calculate the secondary power distribution that the available PCS system needs to handle. Then according to the formula =P current，o + Calculate the final total output power of the PCS system. And use it as the standard for allocation; If the power is exceeded Total redundant power P 总余 According to the formula Calculate the redundancy power ratio s of the available PCS system o. o At the same time, according to the formula = ×s o Calculate the secondary power distribution that the PCS system needs to handle. And use it as the standard for allocation.

[0011] Furthermore, it also includes analyzing power execution deviations, analyzing system-level deviations, and providing feedback corrections.

[0012] Furthermore, the method for analyzing power execution deviation is as follows: Calculate the power execution deviation of the PCS system At the same time, it is compared with the corresponding control threshold. If the power execution deviation is found... If the deviation exceeds the control threshold, a large deviation analysis signal is generated; otherwise, a small deviation analysis signal is generated. The generated large deviation analysis signal is analyzed and gradually corrected using proportional-integral adjustment. The generated small deviation analysis signal is processed and immediately triggered for rapid correction. After integration, SOC equalization control correction information is generated. The PCS system after distribution is corrected in real time, power execution deviation and system level deviation are analyzed, and correction processing is performed according to different size relations, and corresponding correction processing information is generated.

[0013] As a further scheme of the application, the way of analyzing the system level deviation is: The total power deviation of the overall PCS system is calculated according to the formula, and the frequency deviation and voltage deviation of the overall PCS system are also calculated, and compared with the constraint condition to determine the corresponding system level deviation reason, including total power deviation, frequency or voltage deviation; For the total power deviation, the power distribution correction of a single available PCS is calculated, and the correction is performed according to the calculated power distribution correction; For frequency deviation correction, the frequency correction amount is calculated, and the frequency correction amount is added to the total power demand, and for voltage deviation, the voltage correction amount is calculated according to the formula The voltage correction amount is calculated, wherein K v is the frequency droop coefficient, which is distributed to each PCS in proportion to the reactive power capacity.

[0014] The application also provides a group control system for a PCS energy storage system, comprising: A state of charge judgment unit is configured to collect and calculate the state of charge of each PCS, and obtain the corresponding state of charge difference by subtracting the system average SOC from the SOC of a single PCS system, and compare it with the corresponding dynamic threshold value, and generate an SOC equalization control signal if it is greater than the dynamic threshold value, and transmit it to the SOC equalization control analysis unit, otherwise generate a capacity proportional distribution control signal and transmit it to the capacity proportional distribution control analysis unit. The SOC equalization control analysis unit is configured to analyze the SOC equalization control signal, calculate the battery health state of each PCS system, and calculate the corresponding weight in combination with the state of charge, and calculate the system total adjustment amount, and generate the SOC equalization control information according to the weight of each PCS system, and transmit it to the control information output unit. The capacity proportional distribution control analysis unit is configured to analyze the capacity proportional distribution control signal, calculate the capacity proportional distribution value according to the rated capacity of each PCS system, and monitor the temperature in real time, and generate a secondary distribution signal and process it if the temperature exceeds the temperature threshold value, and select all available PCS systems according to the constraint condition, calculate the total redundant power and excess power of all available PCS systems, and distribute according to the rated capacity proportion of the available PCS system if the excess power is greater than the total redundant power, otherwise distribute according to the redundant power proportion of the available PCS system, and generate the capacity proportional distribution control information and transmit it to the control information output unit. A real-time correction feedback unit is configured to correct the PCS system after distribution in real time, analyze the power execution deviation and the size relationship between the system level deviation and the corresponding threshold value, and correct according to different size relationships, generate corresponding correction processing information, and transmit to the regulation information output unit; A regulation information output unit is configured to display the obtained SOC balancing regulation information, capacity proportion distribution regulation information and correction processing information to the corresponding management personnel.

[0015] The present application provides a group regulation control method and system for a PCS energy storage system. Compared with the prior art, the following beneficial effects are achieved: The present application constructs a dynamic weight based on SOH, capacity proportion and SOC difference value, accurately calculates the SOH correction coefficient through linear relationship, ensures that the PCS with high health degree and large capacity is given priority to undertake the balancing task, effectively protects the weak health battery, prolongs the battery cycle life, clearly restricts the multiple selection of available PCS, and according to the size relationship between the excess power and the total redundant power, respectively adopts the capacity proportion or the redundant power proportion distribution strategy, ensures that the power distribution is reasonable and there is no risk of device overload, can reduce the power distribution deviation after the failure of a single PCS, and improves the system fault response speed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The present application is a step method diagram; Figure 2 The present application is a system block diagram. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] First embodiment Please refer to Figure 1 The present application provides a group regulation control method for a PCS energy storage system, which specifically includes the following steps: Step one, through the central controller real-time acquisition of each PCS state of charge SOC, state of health SOH, single cell voltage balance degree and real-time charging and discharging limit, and respectively calculate the corresponding state of charge SOC difference of each PCS system, and the specific calculation method is through the single PCS system SOC minus the system average SOC, at the same time, the obtained state of charge difference is compared with the dynamic threshold value, and the specific value of the dynamic threshold value is set by the management personnel, if the state of charge difference is greater than the dynamic threshold value, the SOC equalization control signal is generated, otherwise if the state of charge difference is less than the dynamic threshold value, the capacity proportional distribution control signal is generated; Step two, analyze the generated SOC equalization control signal, obtain each PCS system and label as i, and i=1, 2, …, j, wherein j represents the number of PCS systems, obtain the current battery capacity and the battery rated capacity, and calculate the corresponding battery health state SOH of the PCS system according to the formula SOH=(current battery capacity / battery rated capacity)×100%, then establish the linear relationship between the battery health state SOH and the correction coefficient, the expression is k SOH =a×SOH+b, solve a and b combined with the constraint condition, specifically when the battery health state SOH is 100%, the health correction coefficient k SOH =1.0, when the battery health state SOH is 80%, the health correction coefficient k SOH =0.85, further calculation obtains a=0.75, b=0.25, the expression is simplified to obtain the health correction coefficient k SOH =0.75·SOH+0.25; When the temperature exceeds the threshold or the control according to the expected capacity, combined with the feedback obtained actual capacity of the system is lower than expected, match k SOH corresponding a, b coefficient, control the input / output of the PCS system, avoid forming vicious circle; Then obtain the state of charge difference corresponding to each PCS system, and calculate the weight W of the PCS system according to the formula i , and C i is the battery capacity corresponding to the PCS system i, wherein represents the capacity proportion of the PCS system, represents the state of charge difference of the PCS system, then obtain the total state of charge difference of the PCS system and the dynamic threshold value S th , calculate the total adjustment amount P 总调量 according to the formula , P 基础 represents the basic adjustment power, usually takes 5%-10% of the rated power of the system, the specific value is determined by the operator.k scaleThis represents the scaling factor, with a value ranging from 1.5 to 2.0; min(*) represents the minimum value function. Simultaneously, based on the calculated weight W i Adjustments should be made based on the corresponding discharge or charge conditions, specifically for the discharge group, according to the formula. The corresponding discharge amount is calculated, and the charging group is adjusted using the same formula to obtain the corresponding charging amount. Simultaneously, corresponding SOC balancing control information is generated. Secondly, for off-grid scenarios, virtual impedance compensation is introduced to offset the circulating current caused by line impedance differences, ensuring that the bus voltage fluctuation during SOC balancing is ≤±2%. The virtual impedance compensation formula is as follows: , where k a This is the proportionality coefficient.

[0019] Step 3: Process the generated capacity proportional allocation control signal to obtain the corresponding capacity proportional allocation PCS system label denoted as n, where n = 1, 2, ..., m, and m represents the number of capacity proportional allocation PCS systems. Obtain the current total active power demand P of the system. total Simultaneously, obtain its corresponding rated capacity Cn, where rated capacity represents the rated capacity of the battery in the PCS, and then apply the formula... The capacity allocation value P is calculated. fault ,in Allocate the total rated capacity of all PCS systems according to their capacity ratios, and base the allocation on the calculated capacity ratio value P. fault The capacity ratio allocation PCS system is monitored in real time to obtain the real-time temperature of the cells. If the real-time temperature is greater than the temperature threshold, and the specific value of the temperature threshold is set by the operator, such as 70℃, then secondary allocation is triggered and a secondary allocation signal is generated. Step 4: Process the generated secondary allocation signal, filter all available PCS systems according to the constraints, and label them as o, where o = 1, 2, ..., R, and R represents the number of available PCS systems. The constraints include: cell temperature ≤ safety threshold, battery health state SOH ≥ 80%, and current actual output power P. current < its maximum permissible power P max There are no fault alarms such as overvoltage, overcurrent, or communication interruption, and its maximum allowable power P max The calculation formula is , where P rated To correspond to the rated power of the PCS system, k SOH k is the correction factor for the state of health (SOH) of the battery. temp The temperature correction factor is then used to calculate the total redundant power and excess power of all available PCS. ,and =P fault -Pmaxfault , where Pmax fault This represents the maximum permissible power under temperature limitations, according to the formula... The total redundant power P is calculated. 总余 , where P current，o Indicates the current output power and compares it with the excess power. With total redundant power P 总余 Size relationship; If the power is exceeded ≥ Total Redundant Power P 总余 Then, it will be allocated according to the percentage of the rated capacity of the available PCS. The specific allocation method is to calculate the capacity ratio r of the available PCS system o. o = ,in This represents the total capacity of all available PCS systems, and is based on the formula... = ×r o Calculate the secondary power distribution that the available PCS system needs to handle. Then according to the formula =P current，o + Calculate the final total output power of the PCS system. ; If the power is exceeded Total redundant power P 总余 The redundant power needs to be allocated according to the proportion of available PCS, based on the formula. Calculate the redundancy power ratio s of the available PCS system o. o At the same time, according to the formula = ×s o Calculate the secondary power distribution that the PCS system needs to handle. It also sends a system power redundancy insufficient alarm.

[0020] Step 5: Perform real-time feedback correction on the allocated PCS system, specifically analyzing the relationship between power execution deviation and system-level deviation and corresponding thresholds, and performing correction processing according to different magnitude relationships. The correction processing method for power execution deviation is as follows: Obtain the actual output power P corresponding to all PCS system i actual,i and the corresponding allocated power P alloc，i The allocated power here refers to the power allocated to PCS system n, including the power allocated in the primary and secondary distributions, and is determined according to the formula... =P actual,i -P alloc，i Calculated power execution deviation Meanwhile, the power execution deviation is compared with the corresponding control threshold, and the specific value of the control threshold is set by the operator, which is ±5% of the rated power under normal working conditions; the grid frequency modulation scene is tightened to ±3%; the off-grid scene is relaxed to ±8%, and if the power execution deviation is greater than the control threshold, specifically, the power execution deviation is greater than ±10% of the rated power, which indicates that there is a large deviation, and a large deviation analysis signal is generated, otherwise, if the power execution deviation is less than the control threshold, specifically, the power execution deviation is less than ±10% of the rated power, which indicates that there is a small deviation, and a small deviation analysis signal is generated. The generated large deviation analysis signal is analyzed and gradually corrected by proportional integral adjustment. As an embodiment, the adjustment amount is 30% of the deviation, and the corresponding large deviation correction amount is calculated according to the formula The generated small deviation analysis signal is processed, and a rapid correction is triggered immediately. As an embodiment, the adjustment amount is 80% of the deviation, and the corresponding small deviation correction amount is calculated according to the formula: The SOC balancing control correction information is generated after integration. The correction processing method for system-level deviation is: according to the formula total power deviation: = -P 有功，i The total power deviation of the overall PCS system is calculated, and represents the total active power actually output by all devices in the system, P 有功，i is the total active power demand of the system, and according to the formula =f actual -f rated The frequency deviation of the overall PCS system is calculated, where f actual is the actual operating frequency of the system, f rated is the rated frequency of the system, and according to the formula =U actual -U rated The voltage deviation of the overall PCS system is calculated, where U actual is the actual operating voltage of the system, U rated is the rated voltage of the system, and the calculated parameters are compared with the corresponding constraint conditions, specifically, the absolute value of the total power deviation should not be greater than 2% of the total demand power, the absolute value of the frequency deviation under the grid-connected scene should not be greater than 0.05 Hz, and the absolute value of the voltage deviation should not be greater than 2% of the rated voltage. Determine the corresponding system-level deviation reason, including total power deviation, frequency or voltage deviation, and process according to different reasons. For total power deviation, the correction amount is allocated to all available PCSs in proportion to capacity and SOH health, and the total power deviation is obtained , and according to the formula = P alloc，o + × , the power distribution correction of a single available PCS is calculated , wherein C o is the rated capacity of the oth available PCS, is the sum of the capacities of all available PCSs participating in distribution multiplied by the SOH coefficient, P alloc，o is the allocated power corresponding to the available PCS, represents the SOH correction coefficient of the oth available PCS system, and the calculated power distribution correction is corrected to the standard; For frequency or voltage deviation, the correction is preferentially made by virtual synchronous machine or droop control. For frequency deviation correction, the frequency correction amount is calculated according to the formula , wherein K f is the frequency droop coefficient, and is superimposed on the total power demand. For voltage deviation, the voltage correction amount is calculated according to the formula , wherein K v is the frequency droop coefficient, and is allocated to each PCS in proportion to the reactive capacity.

[0021] Second embodiment Referring to Figure 2 , the embodiment provides a group regulation control system for a PCS energy storage system, which comprises a state of charge judgment unit, an SOC equalization regulation and control analysis unit, a capacity proportion allocation regulation and control analysis unit, a real-time correction feedback unit and a regulation and control information output unit, and combines Figure 2 It can be known that the information between the above functional units is unidirectional transmission; The state of charge judgment unit is used for collecting and calculating the state of charge of each PCS. The state of charge difference corresponding to the SOC of a single PCS system minus the average SOC of the system is obtained, which is compared with the corresponding dynamic threshold value. If the state of charge difference is greater than the dynamic threshold value, an SOC equalization regulation and control signal is generated and transmitted to the SOC equalization regulation and control analysis unit. Otherwise, a capacity proportion allocation regulation and control signal is generated and transmitted to the capacity proportion allocation regulation and control analysis unit. The specific processing mode is the same as the processing process of step one. The SOC equalization regulation analysis unit is configured to analyze the SOC equalization regulation signal, calculate the battery health state of each PCS system, calculate the corresponding weight in combination with the state of charge, calculate the total adjustment amount of the system, regulate according to the weight of each PCS system, generate the SOC equalization regulation information, and transmit the information to the regulation information output unit. The specific processing manner is the same as the processing procedure of step two. The capacity proportion distribution regulation analysis unit is configured to analyze the capacity proportion distribution regulation signal, calculate the capacity proportion distribution value according to the rated capacity of each PCS system, and monitor the temperature in real time. If the temperature exceeds the threshold value, a secondary distribution signal is generated and processed. According to the constraint condition, all available PCS systems are screened, the total redundant power and the excess power of all available PCS systems are calculated, and the capacity proportion distribution regulation information is generated and transmitted to the regulation information output unit. The specific processing manner is the same as the processing procedure of steps three and four. The real-time correction feedback unit is configured to perform real-time feedback correction on the distributed PCS system, analyze the size relationship between the power execution deviation and the system level deviation and the corresponding threshold value, and perform correction processing according to different size relationships. The corresponding correction processing information is generated and transmitted to the regulation information output unit. The specific processing manner is the same as the processing procedure of step five.

[0022] The regulation information output unit is configured to display the obtained SOC equalization regulation information, capacity proportion distribution regulation information, and correction processing information to the corresponding management personnel.

[0023] Some data in the above formula are dimensionless for numerical calculation. In addition, the contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0024] The above embodiments are only used to illustrate the technical method of the present application and are not limited. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical method of the present application.

Claims

1. A method for group regulation control of a PCS energy storage system, characterized in that, The method specifically comprises the following steps: The state of charge of each PCS system is collected, and the state of charge difference of a single PCS system is calculated by subtracting the system average SOC from the PCS system SOC. The state of charge difference is compared with a preset state of charge dynamic threshold value; If the state of charge difference is greater than the state of charge dynamic threshold value, an SOC equalization control signal is generated, and the corresponding state of charge weight is calculated in combination with the battery health state and the state of charge of each PCS system, and the system total adjustment amount is calculated. The state of charge of the PCS system is regulated according to the weight of each PCS system; If the state of charge difference is less than the state of charge dynamic threshold value, a capacity proportional distribution control signal is generated. The capacity proportional distribution value is calculated according to the rated capacity of each PCS system, and the temperature is monitored in real time. If the temperature exceeds the temperature threshold value, a secondary distribution signal is generated; The secondary distribution signal is processed. According to the constraint condition, all available PCS systems are screened, the total redundant power and the excess power of all available PCS systems are calculated. If the excess power is greater than the total redundant power, the distribution is performed according to the rated capacity proportion of the available PCS system. Otherwise, the distribution is performed according to the redundant power proportion of the available PCS system.

2. A method for group regulation control of a PCS energy storage system according to claim 1, wherein, The calculation method of the battery health state SOH is as follows: The battery health state SOH of each PCS system is obtained. Establishing a correction relationship k of state of health SOH of the battery SOH =a x SOH + b, wherein a and b are calibrated k according to different situations of SOH SOH The obtained health correction coefficient.

3. A method for group regulation control of a PCS energy storage system according to claim 1, wherein, The calculation method of the system total adjustment amount is as follows: According to the formula The weight W corresponding to the PCS system is calculated i , and C i is the battery capacity corresponding to the PCS system i, wherein represents the capacity proportion corresponding to the PCS system, represents the state of charge difference value of the PCS system; according to the formula The total adjustment amount P 总调量 is calculated 基础 P scale represents the scaling coefficient, represents the total state of charge difference value, S th represents the dynamic threshold value.

4. A method for group regulation control of a PCS energy storage system according to claim 3, wherein, The regulation method according to the weight of each PCS system is as follows: According to the calculated weight W i Adjusting in combination with the corresponding discharge or charging condition, for the discharge group adjustment, according to the formula The corresponding discharge amount is calculated, and the corresponding charging amount of the charging group is calculated, and the corresponding SOC balancing control information is generated.

5. A method for group regulation control of a PCS energy storage system according to claim 1, wherein, The generation method of the secondary distribution signal is as follows: obtaining the current total active demand P of the PCS system total and the rated capacity Cn, the capacity proportioning value P is calculated according to the formula fault wherein is the sum of the rated capacities of all the capacity proportioning PCS systems;​ Then, the real-time temperature of the battery cell is compared with the preset temperature threshold value. If the real-time temperature is greater than the temperature threshold value, the secondary distribution signal is generated.

6. A method for group regulation control of a PCS energy storage system according to claim 1, wherein, The processing method of the secondary distribution signal is as follows: Calculate the total redundant power and excess power of all available PCS systems. ,and =P fault -Pmax fault , where Pmax fault This represents the maximum permissible power under temperature limitations, according to the formula... The total redundant power P is calculated. 总余 , where P current，o Indicates the current output power; If the power exceeds the total power ≥ total redundant power P 总余 , calculate the capacity proportion of the available PCS system o: r o = ;in This represents the total capacity of all available PCS systems, and is based on the formula... = ×r o Calculate the secondary power distribution that the available PCS system needs to handle. According to the formula =P current，o + Calculate the final total output power of the PCS system. And use it as the standard for allocation; If the power exceeds <total redundant power P 总余 , according to the formula The proportion of the redundant power of the available PCS system o is calculated o At the same time, according to the formula = ×s o The secondary distribution power that the PCS system o needs to undertake is calculated , and it is used as the standard for distribution.

7. A method for group regulation control of a PCS energy storage system according to claim 1, wherein, It also includes analyzing power execution deviation, analyzing system level deviation and feedback correction.

8. A method for group regulation control of a PCS energy storage system according to claim 7, wherein, The method for analyzing power execution deviation is as follows: Computing a power performance deviation of a PCS system and comparing it to a corresponding regulatory threshold, and generating a large deviation analysis signal if the power performance deviation is greater than the regulatory threshold, and generating a small deviation analysis signal otherwise; The large deviation analysis signal generated is analyzed, and proportional integral adjustment is used for step-by-step correction. The small deviation analysis signal generated is processed, and immediate trigger is used for rapid correction. SOC equalization regulation correction information is generated after integration; Real-time feedback correction is performed on the distributed PCS system. The size relationship between the power execution deviation and the system level deviation and the corresponding threshold value is analyzed, and correction processing is performed according to different size relationships to generate corresponding correction processing information.

9. A method for group regulation control of a PCS energy storage system according to claim 7, wherein, The method for analyzing system level deviation is as follows: The total power deviation of the overall PCS system is calculated according to the formula total power deviation. The frequency deviation of the overall PCS system and the voltage deviation of the overall PCS system are also calculated, and are compared with the constraint condition to determine the corresponding system level deviation reason, including total power deviation, frequency or voltage deviation; For the total power deviation, the power distribution correction of a single available PCS is calculated, and the power distribution correction is used as the standard for correction; For frequency deviation correction, the frequency correction amount is calculated and added to the total power demand. For voltage deviation, the voltage correction amount is calculated according to the formula , where K v is the frequency droop coefficient, which is distributed to each PCS in proportion to the reactive capacity.

10. A group regulation control system for a PCS energy storage system, characterized by, A group regulation control method for a PCS energy storage system is used to execute any one of claims 1-9, comprising: The charge state determination unit is used for collecting and calculating the charge state of each PCS. The corresponding charge state difference value is obtained by subtracting the system average SOC from the single PCS system SOC, and is compared with the corresponding dynamic threshold value. If the value is greater than the dynamic threshold value, an SOC equalization control signal is generated and transmitted to the SOC equalization control analysis unit. Otherwise, a capacity proportional distribution control signal is generated and transmitted to the capacity proportional distribution control analysis unit. The SOC equalization control analysis unit is used for analyzing the SOC equalization control signal, calculating the battery health state of each PCS system, calculating the corresponding weight in combination with the charge state, calculating the system total adjustment amount, and generating the SOC equalization control information according to the weight of each PCS system, and transmitting the information to the control information output unit. The capacity proportional distribution control analysis unit is used for analyzing the capacity proportional distribution control signal, calculating the capacity proportional distribution value according to the rated capacity of each PCS system, and monitoring the temperature in real time. If the temperature exceeds the threshold value, a secondary distribution signal is generated and processed. According to the constraint condition, all available PCS systems are screened, the total redundant power and the excess power of all available PCS systems are calculated, and the capacity proportional distribution control information is generated and transmitted to the control information output unit. The real-time correction feedback unit is used for real-time feedback correction of the distributed PCS system, analyzing the size relationship between the power execution deviation and the system level deviation and the corresponding threshold value, and correcting the value according to different size relationships to generate the corresponding correction processing information and transmit the information to the control information output unit. The control information output unit is used for displaying the obtained SOC equalization control information, capacity proportional distribution control information and correction processing information to the corresponding management personnel.

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