A rapid response control method for overload and backflow prevention suitable for energy storage sites

Abstract

The present invention provides a rapid response control method for overload and reverse flow prevention applicable to energy storage sites, comprising: step S1, obtaining a high-voltage topology structure; step S2, obtaining basic parameters of the energy storage site, primary power data of the primary transformer, secondary power data of the secondary transformer, and tertiary power data of the energy storage unit; step S3, judging whether at least one trigger condition is met: if so, turning to step S4; if not, returning to step S2; step S4, obtaining the first round of target power reduction of the energy storage unit based on the primary power data, the secondary power data, and the tertiary power data; step S5, obtaining the second round of target power reduction of the energy storage unit based on the first round of target power reduction and the tertiary power data; step S6, obtaining the target execution power of the energy storage unit based on the first round of target power reduction, the second round of target power reduction, and the tertiary power data, and performing control. The beneficial effect is that the present invention can improve the accuracy and speed of overload and reverse flow prevention control of energy storage sites.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage and energy management, and in particular to a rapid response control method for overload and backflow prevention applicable to energy storage sites. Background Art

[0002] Energy storage sites' overload and reverse flow control is a key function of energy storage sites. Its purpose is to ensure that the energy storage site does not suffer equipment damage or grid safety hazards due to excessive load or reverse flow during operation. "Overload protection" primarily refers to the need for energy storage equipment to dynamically reduce charging power or increase discharge power when the energy storage site's power load increases, thereby reducing the amount of power drawn from the grid through the transformer and preventing "tripping" or other safety issues caused by excessive transformer power. "Reverse flow protection" primarily refers to the need for energy storage equipment to dynamically reduce discharge power or increase charging power when the energy storage site's power consumption decreases, thereby avoiding the release of internal energy from the energy storage site to the grid through the transformer, which can cause grid power instability and site power waste.

[0003] In recent years, with the continuous expansion of energy storage sites and the increasing number of application scenarios, overload and reverse flow control at energy storage sites has become increasingly important, and related technical requirements have become increasingly standardized. In particular, during site operation, the power grid's "tolerance" for "over-demand" and "reverse flow" has become increasingly strict. This is mainly reflected in two aspects: first, the allowed "over-demand" and "reverse flow" amplitude is smaller (usually required to be within 10kW or 0.5% of the transformer capacity); second, the frequency and duration of "over-demand" and "reverse flow" are more stringent (frequent occurrence is not allowed, and the single duration does not exceed 0.5 seconds).

[0004] There are two main types of methods for overload and reverse flow control at energy storage sites. The first type is a control method based on traditional feedback control. This method mainly monitors the power of each device at the energy storage site through the EMS system, and then performs dynamic feedback adjustment based on whether overdemand or reverse flow occurs to achieve overload and reverse flow control of the energy storage station. The second type is a control method based on operations research models. This method mainly establishes a constraint optimization model based on the topological structure of the energy storage site, obtains the target execution power of each energy storage device at the energy storage site by solving the model, and finally sends the target execution power to the specific device for execution to achieve overload and reverse flow control of the energy storage station. However, these two methods have some problems in practical applications, mainly manifested in two aspects: low control accuracy and slow control rate. In actual operation, affected by factors such as site load power fluctuations and changes in the state of energy storage equipment, the control method based on traditional feedback control cannot take into account the global optimality during control and is prone to over-control. Therefore, after the over-demand reverse flow situation occurs, multiple controls are required to reach a stable state. The control method based on operations research models has high control accuracy, but due to the complex topological structure of energy storage sites, modeling the topological structure of energy storage sites and establishing constrained optimization models require the introduction of additional auxiliary decision variables and the consideration of more constraints, which leads to a complex model. The mathematical model established requires a large amount of calculation to solve, which is time-consuming and resource-intensive, thus affecting the real-time performance of the control. Therefore, how to improve the accuracy and speed of energy storage site overload and reverse flow control is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to improve the accuracy and speed of overload and backflow prevention control at energy storage sites. In order to overcome the defects of the above-mentioned existing technologies (or related technologies), the present invention provides a fast-response control method for overload and backflow prevention applicable to energy storage sites.

[0006] The present invention provides a rapid response control method for overload and backflow prevention applicable to energy storage sites, comprising:

[0007] Step S1, obtaining a high-voltage topology of an energy storage site, wherein the high-voltage topology includes a primary transformer high-voltage structure and a secondary transformer high-voltage structure, wherein the primary transformer high-voltage structure includes a primary transformer and an energy storage unit and a load unit respectively connected to the primary transformer, and the secondary transformer high-voltage structure includes the primary transformer and multiple secondary transformers connected in sequence, and the energy storage unit and the load unit respectively connected to each of the secondary transformers;

[0008] Step S2, obtaining basic parameters of the energy storage site, primary power data of the primary transformer, secondary power data of the secondary transformer, and tertiary power data of each of the energy storage units;

[0009] Step S3: Based on the basic parameters, determine whether at least one pre-set trigger condition is met:

[0010] If yes, go to step S4 for global planning;

[0011] If not, return to step S2;

[0012] Step S4, obtaining a first-round target power reduction of each energy storage unit according to the primary power data, the secondary power data, and the tertiary power data;

[0013] Step S5, obtaining a second-round target power reduction of each energy storage unit according to the first-round target power reduction and the third-level power data;

[0014] Step S6: obtaining the target execution power of each energy storage unit according to the first-round target power reduction, the second-round target power reduction and the third-level power data, and regulating the target execution power.

[0015] Compared with the prior art, the fast-response control method for overload and backflow prevention applicable to energy storage sites has the following advantages:

[0016] In the present invention, the high-voltage topology is obtained through step S1, data is obtained through step S2, trigger conditions are judged through step S3, the first round of target power reduction calculation is performed through step S4, the second round of target power reduction calculation is performed through step S5, and the target execution power calculation is performed through step S6. When "over-demand" or "reverse flow" occurs at the energy storage site, it is no longer necessary to directly perform global planning and optimization of the target execution strategy of the entire site and wait for the optimization result. Instead, according to the degree of "over-demand" and "reverse flow" on the transformer, the power adjustment increment based on the current execution power is directly calculated. In combination with the power target of the entire site, fine-tuning is performed on the basis of the current execution power of the energy storage unit to obtain the target execution power that each energy storage unit should execute, thereby quickly feeding back the "over-demand" and "reverse flow" situations of the energy storage site, and improving the accuracy and rate of the energy storage site's anti-overload and anti-reverse flow control.

[0017] In a possible implementation, the basic parameters of the energy storage site acquired in step S2 include a total station power target, energy storage rated charging power, energy storage rated discharging power, transformer demand setting value, and transformer reverse current setting value.

[0018] In a possible implementation, the trigger conditions set in step S3 include whether there is a previous global planning result, whether the power target of the entire station has changed, whether the rated charging power of the energy storage has changed, whether the rated discharge power of the energy storage has changed, whether the transformer demand setting value has changed, whether the transformer reverse current setting value has changed, and whether the time since the previous global planning has exceeded the set time.

[0019] In a possible implementation, in step S2, the energy storage rated charging power and the energy storage rated discharging power are corrected using the following calculation formula:

[0020] ,

[0021] ,

[0022] in,

[0023] Indicates the rated charging power of the energy storage;

[0024] Indicates the current SOC value of energy storage;

[0025] Indicates setting the SOC lower limit;

[0026] Indicates setting the upper limit of SOC;

[0027] Indicates the rated discharge power of the energy storage.

[0028] In a possible implementation, the primary power data includes the real-time power, set overload power, or set reverse power of the primary transformer, the secondary power data includes the real-time power, set overload power, or set reverse power of the secondary transformer, and the tertiary power data includes the real-time power and minimum power of the energy storage unit. Then, step S4 includes:

[0029] Step S41: obtaining an excess demand value of the primary transformer according to the real-time power, the set overload power, or the set reverse power of the primary transformer, and obtaining an excess demand value of each secondary transformer according to the real-time power, the set overload power, or the set reverse power of the secondary transformer;

[0030] Step S42, obtaining the maximum reducible power of the energy storage unit according to the real-time power and the minimum power of the energy storage unit under the secondary transformer;

[0031] Step S43, obtaining the first-round target power reduction according to the maximum power reduction possible, the excess demand value of the primary transformer, the real-time power of the energy storage unit, and the minimum power;

[0032] Then, in step S5, the first-round target power reduction is allocated to each of the secondary transformers, the excess demand value of the primary transformer is estimated and updated again, and the secondary reducible power is obtained based on the first-round target power reduction, the real-time power of the energy storage unit, and the minimum power;

[0033] In step S6, the secondary round target power reduction is obtained based on the updated excess demand value of the primary transformer and the secondary reducible power, and the target execution power of each energy storage unit is obtained based on the secondary round target power reduction, the real-time power of the energy storage unit and the first round target power reduction.

[0034] In a possible implementation, in step S42, the maximum reducible power is obtained by the following calculation formula:

[0035] ,

[0036] in,

[0037] Indicates the the maximum reducible power of each of the secondary transformers;

[0038] Indicates the The second transformer The real-time power of each of the energy storage units;

[0039] Indicates the The second transformer the minimum power of each of the energy storage units;

[0040] Indicates the The number of each energy storage unit mounted under the secondary transformer.

[0041] In a possible implementation, in step S43, the first-round target power reduction is obtained by the following calculation formula:

[0042] ,

[0043] in,

[0044] Indicates the first round of target power reduction;

[0045] Indicates the the maximum reducible power of each of the secondary transformers;

[0046] Indicates the the overload power of each of the secondary transformers;

[0047] Indicates the The second transformer The real-time power of each of the energy storage units;

[0048] Indicates the The second transformer the minimum power of each of the energy storage units;

[0049] Indicates the The number of each energy storage unit mounted under the secondary transformer.

[0050] In a possible implementation, in step S44, the secondary reducible power is obtained by the following calculation formula:

[0051] ,

[0052] in,

[0053] represents the secondary reducible power;

[0054] Indicates the The second transformer The real-time power of each of the energy storage units;

[0055] Indicates the first round of target power reduction;

[0056] Indicates the The second transformer The minimum power of each of the energy storage units.

[0057] In a possible implementation, in step S45, the secondary round target reduction power is obtained by the following calculation formula:

[0058] ,

[0059] in,

[0060] Indicates the target power reduction of the second round;

[0061] Indicates the the overload power of each of the secondary transformers;

[0062] represents the secondary reducible power;

[0063] Indicates the The number of each energy storage unit mounted under the secondary transformer.

[0064] In a possible implementation, in step S45, the target execution power is obtained by the following calculation formula:

[0065] ,

[0066] in,

[0067] represents the target execution power;

[0068] Indicates the The second transformer The real-time power of each of the energy storage units;

[0069] Indicates the first round of target power reduction;

[0070] Indicates the target power reduction of the second round;

[0071] Indicates the The number of each energy storage unit mounted under the secondary transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 is a flow chart of the steps of the present invention;

[0073] Figure 2 A schematic diagram of a high-voltage topological structure of the present invention;

[0074] Figure 3 This is a specific flow chart of step S4 of the present invention;

[0075] Figure 4 This is a schematic flow chart of one control cycle of the rapid control strategy of the present invention;

[0076] Figure 5 Schematic diagram of the energy storage site overload prevention process of the present invention. DETAILED DESCRIPTION

[0077] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the embodiments of the present invention and are not intended to limit the scope of protection of the embodiments of the present invention. Those skilled in the art may make adjustments as needed to adapt to specific application scenarios.

[0078] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0079] See also Figure 1 and Figure 2 The embodiment of the present invention discloses a rapid response control method for overload and backflow prevention applicable to energy storage sites, comprising:

[0080] Step S1: Obtain a high-voltage topology structure of the energy storage site. The high-voltage topology structure includes a primary transformer high-voltage structure and a secondary transformer high-voltage structure. The primary transformer high-voltage structure includes a primary transformer and an energy storage unit and a load unit respectively connected to the primary transformer. The secondary transformer high-voltage structure includes a primary transformer and multiple secondary transformers connected in sequence, and an energy storage unit and a load unit respectively connected to each secondary transformer.

[0081] Step S2: Obtain basic parameters of the energy storage site, primary power data of the primary transformer, secondary power data of the secondary transformer, and tertiary power data of each energy storage unit;

[0082] Step S3: Based on the basic parameters, determine whether at least one pre-set trigger condition is met:

[0083] If yes, go to step S4 for global planning;

[0084] If not, return to step S2;

[0085] Step S4, obtaining the first round of target power reduction of each energy storage unit based on the primary power data, the secondary power data, and the tertiary power data;

[0086] Step S5, obtaining the second round target power reduction of each energy storage unit according to the first round target power reduction and the third-level power data;

[0087] Step S6: obtaining the target execution power of each energy storage unit according to the first-round target power reduction, the second-round target power reduction and the third-level power data, and regulating the target execution power.

[0088] The present invention establishes a "dual-branch" decision-making model based on the global decision-making results of the operations optimization method and combines it with the collected real-time data. When "over-demand" or "backflow" occurs, the rapid response performance of feedback control is used to quickly adjust the energy storage unit, thereby accelerating the response rate and response accuracy of the energy storage site's anti-overload and anti-backflow control.

[0089] The high-voltage topology of an energy storage site is primarily used to estimate the impact of adjusting the power of energy storage units on the power of each transformer, thereby providing a theoretical basis for calculating overload and reverse flow control measures for subsequent energy storage sites. Furthermore, the power limit of the energy storage unit must be adjusted based on the SOC, which can be expressed as follows:

[0090] ,

[0091] ,

[0092] in, Indicates the rated charging power of the energy storage; Indicates the current SOC value of energy storage; Indicates setting the SOC lower limit; Indicates setting the upper limit of SOC; Indicates the rated discharge power of the energy storage.

[0093] Since global planning of energy storage site power control takes a long time and consumes a lot of computing resources, it is impossible to perform global planning every time in actual applications. Instead, the need for global planning is determined based on certain conditions to improve the response rate and accuracy of decision-making. Considering the need to maintain the timeliness of global planning and to trigger global planning promptly when key target information of the energy storage site changes, the following global planning trigger conditions are defined:

[0094] c1=whether there is a previous global planning result;

[0095] c2=whether the power target of the entire station has changed;

[0096] c3=whether the rated charging power of the energy storage changes;

[0097] c4=whether the rated discharge power of energy storage changes;

[0098] c5=whether the transformer demand setting value changes;

[0099] c6=whether the transformer reverse current setting value changes;

[0100] c7=Whether the time from the last global plan exceeds the set time;

[0101] When any of the above trigger conditions is met, global planning can be triggered.

[0102] See also Figure 3 , further expand step S4, including:

[0103] Step S41, obtaining an excess demand value of the primary transformer based on the real-time power and the set overload power of the primary transformer, and obtaining an excess demand value of each secondary transformer based on the real-time power and the set overload power of the secondary transformer;

[0104] Step S42, obtaining the maximum reducible power of the energy storage unit according to the real-time power and minimum power of the energy storage unit under the secondary transformer;

[0105] Step S43, obtaining the first round of target power reduction according to the maximum power reduction, the excess demand value of the primary transformer, the real-time power of the energy storage unit, and the minimum power;

[0106] Step S44: Allocate the first round of target power reduction to each secondary transformer, estimate and update the excess demand value of the primary transformer again, and obtain the secondary power reduction based on the first round of target power reduction, the real-time power of the energy storage unit, and the minimum power;

[0107] Step S45 , obtaining the secondary round target power reduction according to the updated excess demand value of the primary transformer and the secondary power reduction, and obtaining the target execution power of each energy storage unit according to the secondary round target power reduction, the real-time power of the energy storage unit and the first round target power reduction.

[0108] Taking the overload (overdemand) prevention of energy storage sites as an example, the calculation process for rapid response regulation decisions is explained:

[0109] 1. Calculate the excess demand value on the primary transformer:

[0110] ,

[0111] in, Represents a primary transformer, Indicates the overload (excess demand) power on the primary transformer. Indicates the real-time power of the primary transformer, Indicates the set overload power or demand power of the primary transformer;

[0112] 2. Calculate the excess demand value on each secondary transformer:

[0113] ,

[0114] in, Indicates the Overload power on the secondary transformer, Indicates the The real-time power on the secondary transformer, Indicates the The set overload power on the secondary transformer, N represents the number of secondary transformers;

[0115] 3. Calculate the maximum power reduction of the energy storage unit under each secondary transformer:

[0116] ,

[0117] in, Represents a secondary transformer The maximum power reduction of the lower energy storage unit, Represents a secondary transformer Lower energy storage unit The real-time power, Represents a secondary transformer Lower energy storage unit The minimum power, Represents a secondary transformer The number of mounted energy storage units;

[0118] 4. Calculate the first round of target power reduction for each energy storage unit:

[0119] ,

[0120] in, Represents a secondary transformer Lower energy storage The first round of target power reduction is as follows: Lower energy storage unit When there is room for overall power reduction ( ), the target power to be reduced is proportionally allocated according to the power reduction space of each energy storage unit under the transformer, and the target power is the minimum value of the current overload power on the transformer and its own maximum power reduction; when the secondary transformer Lower energy storage unit When the maximum power reduction is equal to zero, it means that the energy storage unit under the transformer has no room for further power reduction, so the first round of target power reduction of each energy storage unit is 0;

[0121] 5. Estimate the excess demand value on the primary transformer after the first round of price reduction:

[0122] ,

[0123] The meaning of this formula is that after the first round of target power reduction of the energy storage unit under the secondary transformer is allocated, the excess demand value on the primary transformer is calculated again to further adjust the second round of target power reduction of the energy storage unit under the secondary transformer;

[0124] 6. Calculate the secondary reducible power of each energy storage unit:

[0125] ,

[0126] in, Energy storage unit The secondary reducible power, Energy storage unit The first round of target power reduction is shown in the formula. This formula overall indicates that after the aforementioned regulation, each energy storage unit still has the ability to further reduce power.

[0127] 7. Calculate the target power reduction for each energy storage unit in the next round:

[0128] ,

[0129] in, Energy storage unit The second round of target power reduction is calculated as follows: based on the energy storage power adjusted according to the overload condition of the primary transformer, if the primary transformer is still overloaded, the power value of the primary transformer still overloaded is proportionally assumed according to the power reduction capability of each energy storage unit, and the target power of each energy storage unit is further reduced based on the above regulation.

[0130] 8. Determine the target execution power of all energy storage units:

[0131] ,

[0132] in, Energy storage unit The target execution power of this formula means that the target execution power actually delivered to each energy storage unit is the result of two rounds of power adjustment based on its current power.

[0133] Based on the above calculation results, the target execution power of each energy storage unit is sent to the execution device for execution, completing this round of rapid response control decision-making.

[0134] It should be noted that the overload and backflow prevention control of energy storage power stations is a dynamic process, which requires a continuous cycle of "data collection - planning and decision-making - instruction issuance - instruction execution - data collection" according to the changes in the real-time operating parameters of the site. Figure 4 .

[0135] This invention mainly optimizes the control logic for the "planning and decision-making" part to speed up the site's anti-overload and anti-backflow response rate. At the same time, to ensure the overall good anti-overload and anti-backflow effect, there are certain requirements for hardware equipment, mainly including: the energy storage site's electricity meter must support high-frequency acquisition of real-time power (about 10ms); the execution equipment (mainly PCS) must have a fast response function for active power instructions (10ms response in place) and high-standard execution accuracy of active power (single execution error does not exceed ±10W). In addition, it is necessary to ensure good network communication conditions between various devices on the energy storage power station site (mainly PCS, BMS, electricity meters and EMS).

[0136] Figure 5 This is a schematic diagram of the energy storage site overload prevention process in an embodiment of the present invention. The actual data in this process is shown in Table 1 below:

[0137] Table 1 Actual data table of the energy storage site overload protection process (power unit in the table is kW)

[0138] ,

[0139]

[0140] Figure 5 Table 1 shows the effect of the rapid control strategy in an actual operation. Figure 5 The first figure shows the change in transformer power at the site. The transformer overload power (gd_max in the figure) is set to 900kW in the initial period. At time 10, it suddenly drops to 870kW. At this time, through the rapid response strategy, the energy storage charging power drops from 100kW to 80kW (see Figure 5 es_tar in the second figure), but due to the energy storage device power execution has a certain time delay (see Figure 5 es_now in the second figure), resulting in a slight overload on the transformer at that moment, but at time 11, the energy storage device power is fully implemented and the transformer power returns to normal (see Figure 5 gd_now in the first figure); at time 28, the site load power suddenly increases, causing the transformer power to exceed the set overload value. At this time, the fast response strategy reduces the energy storage charging power again (see Figure 5 es_tar in the second figure), the transformer power also immediately returns to below the set overload power (see Figure 5 gd_now and gd_max in the first figure); at time 49, the user sets the energy storage target charging power to be reduced from the original 100kW to 40kW (see curve es_tar), from Figure 5As shown in the second figure, the energy storage control target curve es_set and the real-time power curve es_now indicate that the energy storage can also respond immediately, achieving rapid regulation of site power.

[0141] See Figure 5 The third figure shows the time from the start of data collection to the issuance of control instructions for each rapid control. As can be seen from the figure, the time from data collection to instruction issuance is generally within 50ms. In some periods, resource utilization caused by the triggering of global planning can extend the time for rapid decision-making to around 300ms. Overall, the response time of rapid control is much faster than the technical requirement of 500ms, demonstrating the superiority of the solution described in this invention in preventing overload and backflow at energy storage sites.

[0142] In the description of the present invention, the reference terms "one embodiment", "some embodiments", "in the present embodiment", "specific examples", or "some examples" mean that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0143] 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 changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A rapid response control method for overload and backflow prevention applicable to energy storage sites, characterized in that: The following steps are involved: Step S1, obtaining a high-voltage topology of an energy storage site, wherein the high-voltage topology includes a primary transformer high-voltage structure and a secondary transformer high-voltage structure, wherein the primary transformer high-voltage structure includes a primary transformer and an energy storage unit and a load unit respectively connected to the primary transformer, and the secondary transformer high-voltage structure includes the primary transformer and multiple secondary transformers connected in sequence, and the energy storage unit and the load unit respectively connected to each of the secondary transformers; Step S2, obtaining basic parameters of the energy storage site, primary power data of the primary transformer, secondary power data of the secondary transformer, and tertiary power data of each of the energy storage units; Step S3: Based on the basic parameters, determine whether at least one pre-set trigger condition is met: If yes, go to step S4 for global planning; If not, return to step S2; Step S4, obtaining a first-round target power reduction of each energy storage unit according to the primary power data, the secondary power data, and the tertiary power data; Step S5, obtaining a second-round target power reduction of each energy storage unit according to the first-round target power reduction and the third-level power data; Step S6, obtaining the target execution power of each energy storage unit according to the first-round target power reduction, the second-round target power reduction and the third-level power data and regulating the target execution power; The primary power data includes the real-time power, set overload power, or set reverse power of the primary transformer, the secondary power data includes the real-time power, set overload power, or set reverse power of the secondary transformer, and the tertiary power data includes the real-time power and minimum power of the energy storage unit. Step S4 includes: Step S41: obtaining an excess demand value of the primary transformer according to the real-time power, the set overload power, or the set reverse power of the primary transformer, and obtaining an excess demand value of each secondary transformer according to the real-time power, the set overload power, or the set reverse power of the secondary transformer; Step S42, obtaining the maximum reducible power of the energy storage unit according to the real-time power and the minimum power of the energy storage unit under the secondary transformer; Step S43, obtaining the first-round target power reduction according to the maximum power reduction possible, the excess demand value of the primary transformer, the real-time power of the energy storage unit, and the minimum power; Then, in step S5, the first-round target power reduction is allocated to each of the secondary transformers, the excess demand value of the primary transformer is estimated and updated again, and the secondary reducible power is obtained based on the first-round target power reduction, the real-time power of the energy storage unit, and the minimum power; In step S6, the secondary round target power reduction is obtained based on the updated excess demand value of the primary transformer and the secondary reducible power, and the target execution power of each energy storage unit is obtained based on the secondary round target power reduction, the real-time power of the energy storage unit and the first round target power reduction.

2. The overload and backflow prevention rapid response control method according to claim 1, characterized in that: The basic parameters of the energy storage site obtained in step S2 include the overall site power target, energy storage rated charging power, energy storage rated discharging power, transformer demand setting value, and transformer reverse current setting value.

3. The overload and backflow prevention rapid response control method according to claim 2, characterized in that: The trigger conditions set in step S3 include whether there is a previous global planning result, whether the power target of the entire station has changed, whether the rated charging power of the energy storage has changed, whether the rated discharge power of the energy storage has changed, whether the transformer demand setting value has changed, whether the transformer reverse current setting value has changed, and whether the set time has passed since the previous global planning.

4. The overload and backflow prevention rapid response control method according to claim 2, characterized in that: In step S2, the energy storage rated charging power and the energy storage rated discharging power are corrected using the following calculation formula: ， ， in, Indicates the rated charging power of the energy storage; Indicates the current SOC value of energy storage; Indicates setting the SOC lower limit; Indicates setting the upper limit of SOC; Indicates the rated discharge power of the energy storage.

5. The overload and backflow prevention rapid response control method according to claim 1, characterized in that: In step S42, the maximum reducible power is obtained by the following calculation formula: , in, Indicates the the maximum reducible power of each of the secondary transformers; Indicates the The second transformer The real-time power of each of the energy storage units; Indicates the The second transformer the minimum power of each of the energy storage units; Indicates the The number of each energy storage unit mounted under the secondary transformer.

6. The overload and backflow prevention rapid response control method according to claim 1, characterized in that: In step S43, the first-round target power reduction is obtained by the following calculation formula: ， in, Indicates the first round of target power reduction; Indicates the the maximum reducible power of each of the secondary transformers; Indicates the the overload power of each of the secondary transformers; Indicates the The second transformer The real-time power of each of the energy storage units; Indicates the The second transformer the minimum power of each of the energy storage units; Indicates the The number of each energy storage unit mounted under the secondary transformer.

7. The overload and backflow prevention rapid response control method according to claim 1, characterized in that: In step S5, the secondary reducible power is obtained by the following calculation formula: ， in, represents the secondary reducible power; Indicates the The second transformer The real-time power of each of the energy storage units; Indicates the first round of target power reduction; Indicates the The second transformer The minimum power of each of the energy storage units.

8. The overload and backflow prevention rapid response control method according to claim 1, characterized in that: In step S6, the secondary round target power reduction is obtained by the following calculation formula: ， in, Indicates the target power reduction of the second round; Indicates the the overload power of each of the secondary transformers; represents the secondary reducible power; Indicates the The number of each energy storage unit mounted under the secondary transformer.

9. The overload and backflow prevention rapid response control method according to claim 1, characterized in that: In step S6, the target execution power is obtained by the following calculation formula: ， in, represents the target execution power; Indicates the The second transformer The real-time power of each of the energy storage units; Indicates the first round of target power reduction; Indicates the target power reduction of the second round; Indicates the The number of each energy storage unit mounted under the secondary transformer.

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