Anti-overload and anti-countercurrent quick response regulation and control method suitable for energy storage station

Abstract

The invention provides an anti-overload and anti-countercurrent quick response regulation and control method suitable for an energy storage station. The method comprises the following steps: S1, obtaining a strong current topological structure; s2, acquiring basic parameters of an energy storage station, first-stage power data of a first-stage transformer, second-stage power data of a second-stage transformer and third-stage power data of an energy storage unit; s3, judging whether at least one triggering condition is met or not: if so, turning to step S4; if not, returning to the step S2; s4, according to the first-level power data, the second-level power data and the third-level power data, the first-round target down-regulation power of the energy storage unit is obtained; s5, according to the first-round target down-regulation power and the third-level power data, obtaining the second-round target down-regulation power of the energy storage unit; and S6, obtaining target execution power of the energy storage unit according to the first-round target down-regulation power, the second-round target down-regulation power and the three-level power data, and performing regulation and control. The method has the beneficial effects that the precision and the speed of anti-overload and anti-backflow regulation and control of the energy storage station can be improved.

Description

Technical Field

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

[0002] The overload prevention and reverse current prevention regulation of an energy storage site is one of the important functions of the energy storage site. The purpose is to ensure that the equipment of the energy storage site will not be damaged or cause potential safety hazards to the power grid due to excessive load or reverse current during operation. "Overload prevention" mainly means that when the power consumption load of the energy storage site increases, the energy storage device needs to dynamically reduce the charging power or increase the discharging power, so as to reduce the electric energy obtained from the power grid through the transformer and prevent "tripping" or causing a series of other safety problems due to too high transformer power. "Reverse current prevention" mainly means that when the power consumption of the energy storage site decreases, the energy storage device needs to dynamically reduce the discharging power or increase the charging power, so as to avoid the power grid power instability and site electric energy waste caused by releasing the internal electric energy of the energy storage site to the power grid through the transformer.

[0003] In recent years, with the continuous expansion of the scale of energy storage sites and the continuous increase of application scenarios, the overload prevention and reverse current prevention regulation of energy storage sites has become increasingly important, and the relevant technical requirements have become more and more standardized. Especially during the operation of the site, the power grid's "tolerance" for "excessive demand" and "reverse current" has become increasingly strict, mainly reflected in two aspects: one is that the allowable amplitude of "excessive demand" and "reverse current" is smaller (usually required to be within 10 kW or 0.5% of the transformer capacity), and the other is that the requirements for the number of occurrences and duration of "excessive demand" and "reverse current" are higher (not allowed to occur frequently, and the single duration does not exceed 0.5 seconds).

[0004] There are two main methods for overload and reverse flow control of energy storage sites. The first 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 according to whether there is over-demand or reverse flow to achieve overload and reverse flow control of the energy storage station. The second 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 application, which are mainly reflected in the low control accuracy and slow control rate: that is, 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 occurs, it takes multiple controls to reach a stable state; although the control method based on the operations research model has higher control accuracy, due to the complex topological structure of the energy storage site, the topological structure of the energy storage site needs to be modeled and the constraint optimization model needs to be established. It is necessary to introduce additional auxiliary decision variables and consider more constraints at the same time, which leads to the complexity of the model. The mathematical model established requires a large amount of calculation to solve, which is time-consuming and resource-consuming, and thus affects the real-time performance of the control. Therefore, how to improve the accuracy and rate 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 rate of overload and backflow prevention control at energy storage sites. In order to overcome the defects of the above-mentioned prior art (or related technology), the present invention provides a fast response control method for overload and backflow prevention suitable for energy storage sites.

[0006] 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 of an energy storage site, wherein the high-voltage topology structure 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 a plurality of 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 preset trigger condition is satisfied: If so, proceed to Step S4 for global planning; If not, return to the said Step S2; Step S4: Obtain the 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: Obtain the second-round target power reduction of each energy storage unit according to the first-round target power reduction and the tertiary power data; Step S6: Obtain 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 tertiary power data, and perform regulation of the target execution power.

[0007] Compared with the prior art, a fast response regulation method for overload prevention and reverse current prevention applicable to an energy storage site in the present invention has the following advantages: In the present invention, the strong electrical topology structure is obtained through Step S1, data is obtained through Step S2, trigger condition judgment is performed through Step S3, the first-round target power reduction is calculated through Step S4, the second-round target power reduction is calculated through Step S5, and the target execution power is calculated through Step S6. When "over-demand" or "reverse current" occurs at the energy storage site, instead of directly performing global planning optimization of the full-site target execution strategy and waiting for the optimization result, the power adjustment increment based on the current execution power is directly calculated according to the degree of "over-demand" and "reverse current" on the transformer, combined with the full-site power target, and 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, so as to quickly feedback on the situation of "over-demand" and "reverse current" at the energy storage site, and improve the accuracy and rate of overload prevention and reverse current prevention regulation of the energy storage site.

[0008] In a possible implementation manner, the basic parameters of the energy storage site obtained in the said Step S2 include the full-site power target, the rated charging power of the energy storage, the rated discharging power of the energy storage, the transformer demand setting value, and the transformer reverse current setting value.

[0009] In a possible implementation manner, each trigger condition set in the said Step S3 includes whether there is a previous global planning result, whether the full-site power target changes, whether the rated charging power of the energy storage changes, whether the rated discharging power of the energy storage changes, whether the transformer demand setting value changes, whether the transformer reverse current setting value changes, and whether the time since the previous global planning exceeds the set time.

[0010] In a possible implementation, in step S2, the rated charging power and the rated discharging power of the energy storage are corrected by the following calculation formula: , , where represents the rated charging power of the energy storage; represents the current SOC value of the energy storage; represents the set lower SOC limit value; represents the set upper SOC limit value; represents the rated discharging power of the energy storage.

[0011] In a possible implementation, the primary power data includes the real-time power, the set overload power or the set reverse power of the primary transformer, the secondary power data includes the real-time power, the set overload power or the set reverse power of the secondary transformer, and the tertiary power data includes the real-time power and the minimum power of the energy storage unit. Then step S4 includes: Step S41: Obtain the excess 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 for each secondary transformer, obtain the excess value of the secondary transformer according to the real-time power, the set overload power or the set reverse power of the secondary transformer; Step S42: Obtain 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: Obtain the first-round target reduction power according to the maximum reducible power, the excess value of the primary transformer, the real-time power and the minimum power of the energy storage unit; Then in step S5, the first-round target reduction power is allocated to each secondary transformer, the excess value of the primary transformer is estimated and updated again, and the secondary reducible power is obtained according to the first-round target reduction power, the real-time power and the minimum power of the energy storage unit; In step S6, the secondary-round target reduction power is obtained according to the updated excess value of the primary transformer and the secondary reducible power, and the target execution power of each energy storage unit is obtained according to the secondary-round target reduction power, the real-time power of the energy storage unit and the first-round target reduction power.

[0012] In a possible implementation, in step S42, the maximum power that can be reduced is obtained through the following calculation formula: , wherein, represents the maximum power that can be reduced of the th secondary transformer; represents the real-time power of the th energy storage unit under the th secondary transformer; represents the minimum power of the th energy storage unit under the th secondary transformer; represents the number of each energy storage unit mounted under the th secondary transformer.

[0013] In a possible implementation, in step S43, the first-round target power reduction is obtained through the following calculation formula: , wherein, represents the first-round target power reduction; represents the maximum power that can be reduced of the th secondary transformer; represents the overload power of the th secondary transformer; represents the real-time power of the th energy storage unit under the th secondary transformer; represents the minimum power of the th energy storage unit under the th secondary transformer; represents the number of each energy storage unit mounted under the th secondary transformer.

[0014] In a possible implementation, in step S44, the secondary power that can be reduced is obtained through the following calculation formula: , wherein, Indicates the secondary power that can be reduced; Indicates the th real-time power of the th energy storage unit under the Indicates the th lowest power of the

[0015] th energy storage unit under the , where Indicates the secondary target power reduction; Indicates the overload power of the th secondary transformer; Indicates the number of each

[0016] energy storage unit mounted under the , where Indicates the target execution power; Indicates the th real-time power of the th energy storage unit under the Indicates the first-round target power reduction; Indicates the number of each Brief Description of the Drawings

[0017] Figure 1 Is the step flow chart of the present invention; Figure 2 Is the schematic diagram of the high-voltage topology structure of the present invention; Figure 3 It is the specific flowchart of step S4 of the present invention; Figure 4 It is the schematic flowchart of one control cycle of the fast regulation strategy of the present invention; Figure 5 It is the schematic diagram of the overload prevention process of the energy storage site of the present invention. Specific embodiments

[0018] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present invention, and are not intended to limit the protection scope of the embodiments of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] See Figure 1 and Figure 2 An overload prevention, reverse current prevention and fast response regulation method applicable to an energy storage site disclosed in an embodiment of the present invention includes: Step S1, obtaining the strong electricity topology structure of the energy storage site. The strong electricity topology structure includes a primary transformer strong electricity structure and a secondary transformer strong electricity structure. The primary transformer strong electricity structure includes a primary transformer and an energy storage unit and a load unit respectively connected to the primary transformer. The secondary transformer strong electricity structure includes a primary transformer and a plurality of secondary transformers connected in sequence and an energy storage unit and a load unit respectively connected to each secondary transformer; Step S2, obtaining the basic parameters of the energy storage site, the primary power data of the primary transformer, the secondary power data of the secondary transformer and the tertiary power data of each energy storage unit; Step S3, based on the basic parameters, determining whether at least one preset trigger condition is satisfied: If so, go to step S4 for global planning; If not, return to step S2; Step S4, obtaining the 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 the second-round target power reduction of each energy storage unit according to the first-round target power reduction and the tertiary 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 tertiary power data and performing regulation of the target execution power.

[0021] The present invention establishes a "dual-branch" decision-making model based on the global decision-making results of the operations optimization method, combined with the collected real-time data, and uses the rapid response performance of feedback control to quickly adjust the energy storage unit when "overdemand" and "backflow" occur, thereby accelerating the response rate and response accuracy of the energy storage site's anti-overload and anti-backflow control.

[0022] The high-voltage topology of the energy storage site is mainly used to estimate the impact of adjusting the power of the energy storage unit on the power of each transformer, thereby providing a theoretical basis for the calculation of the subsequent overload and reverse flow control of the energy storage site; in addition, for the energy storage unit, its power limit needs to be converted according to the SOC situation, which can be expressed by the 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 SOC upper limit value; Indicates the rated discharge power of the energy storage.

[0023] 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, it is necessary to determine whether global planning is needed 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 trigger global planning in time when key target information of energy storage sites changes, the following global planning trigger conditions are defined: c1=whether there is a previous global planning result; c2=whether the power target of the whole station changes; c3=whether the rated charging power of the energy storage changes; c4=whether the rated discharge power of energy storage changes; c5=whether the transformer demand setting value changes; c6=whether the transformer reverse current setting value changes; c7=Whether the time from the last global planning exceeds the set time; When any of the above trigger conditions is met, global planning can be triggered.

[0024] See also Figure 3 , further expand step S4, including: Step S41: Obtain the excess value of the primary transformer based on the real-time power and the set overload power of the primary transformer. For each secondary transformer, obtain the excess value of the secondary transformer based on the real-time power and the set overload power of the secondary transformer. Step S42: Obtain the maximum power that can be reduced by the energy storage unit based on the real-time power and the minimum power of the energy storage unit under the secondary transformer. Step S43: Obtain the first-round target power reduction based on the maximum power that can be reduced, the excess value of the primary transformer, the real-time power, and the minimum power of the energy storage unit. Step S44: Allocate the first-round target power reduction to each secondary transformer, estimate and update the excess value of the primary transformer again, and obtain the secondary power that can be reduced based on the first-round target power reduction, the real-time power, and the minimum power of the energy storage unit. Step S45: Obtain the second-round target power reduction based on the updated excess value of the primary transformer and the secondary power that can be reduced, and obtain the target execution power of each energy storage unit based on the second-round target power reduction, the real-time power of the energy storage unit, and the first-round target power reduction.

[0025] Taking the case of preventing overload (excess demand) at the energy storage site as an example, illustrate the calculation process of the fast response regulation decision: 1. Calculate the excess value on the primary transformer: , where represents the primary transformer, represents the overload (excess demand) power on the primary transformer, represents the real-time power of the primary transformer, represents the set overload power or demand power of the primary transformer; 2. Calculate the excess value on each secondary transformer: , where represents the overload power on the th secondary transformer, represents the real-time power on the th secondary transformer, represents the set overload power on the th secondary transformer, and N represents the number of secondary transformers; 3. Calculate the maximum power that can be reduced by the energy storage unit under each secondary transformer: , where represents the maximum power that can be reduced by the energy storage unit under the secondary transformer , represents the secondary transformer under the energy storage unit The real-time power represents the secondary transformer the following energy storage unit the minimum power represents the secondary transformer the number of energy storage units mounted; 4. Calculate the first-round target power reduction of each energy storage unit: , wherein, represents the secondary transformer the following energy storage the first-round target power reduction, the meaning of this formula is that when the energy storage unit under the secondary transformer as a whole has room for power reduction( ), the target power to be reduced is proportionally distributed according to the respective power reduction spaces of the energy storage units under the transformer, and this target power is the minimum of the current overload power on the transformer and its own maximum power reduction; when the secondary transformer the following energy storage unit the maximum power reduction is zero, which means that the energy storage unit under the transformer has no further room for power reduction, so the first-round target power reduction of each energy storage unit is 0; 5. Estimate the excess value on the primary transformer after the first-round reduction: , the meaning of this formula is that after the first-round target power reduction of the energy storage unit under the secondary transformer is allocated, the excess value on the primary transformer is calculated again to further adjust the second-round target power reduction of the energy storage unit under the secondary transformer; 6. Calculate the secondary power reduction capacity of each energy storage unit: , wherein, represents the energy storage unit the secondary power reduction capacity, represents the energy storage unit the first-round target power reduction, the whole formula represents the remaining power reduction capacity space of each energy storage unit after the above-mentioned regulation; 7. Calculate the second-round target power reduction of each energy storage unit: , wherein, represents the energy storage unit The target power in the second round is lowered. The meaning of this formula is that based on the energy storage power adjusted according to the overload situation of the primary transformer, if it still causes overload on the primary transformer, then the remaining overload power value on the primary transformer is proportionally borne according to the remaining power reduction capacity of each energy storage unit, and the target power for further reduction of each energy storage unit on the basis of the above regulation is obtained; 8. Determine the target execution power of all energy storage units: , wherein, represents the target execution power of the energy storage unit . The meaning of this formula is that the target execution power actually issued to each energy storage unit is the result after two rounds of power adjustment based on its current power.

[0026] According to the above calculation results, the target execution power of each energy storage unit is issued to the execution device for execution, completing the fast response regulation decision-making of this round.

[0027] It should be noted that the overload and reverse current prevention regulation of the energy storage power station is a dynamic process, which requires a continuous cycle process of "data collection - planning decision - instruction issuance - instruction execution - data collection" according to the changes of the real-time operation parameters of the site. See Figure 4 .

[0028] The present invention mainly optimizes the control logic for the "planning decision" part to accelerate the response rate of the site's overload and reverse current prevention. At the same time, to ensure the good effect of overall overload and reverse current prevention, certain requirements are also imposed on the hardware devices, mainly including: the electricity meters at the energy storage site must support high-frequency acquisition of real-time power (about 10 ms); the execution devices (mainly PCS) must have a fast response function for active power commands (responding within 10 ms) and a high standard of execution accuracy for active power (the single execution error does not exceed ±10 W). In addition, it is necessary to ensure good network communication conditions among the devices at the energy storage power station site (mainly PCS, BMS, electricity meters, and EMS).

[0029] Figure 5 is a schematic diagram of the overload prevention process at the energy storage site in the embodiment of the present invention. The actual data in this process is shown in Table 1 below: Table 1 Actual data table of the overload prevention process at the energy storage site (the power unit in the table is kW) ,

[0030] Figure 5 And Table 1 shows the effect of the fast regulation strategy in an actual operation, where Figure 5The first figure shows the variation of the power of the substation transformer. In the initial period, the overload power of the transformer (gd_max in the figure) is set to 900 kW, and it suddenly drops to 870 kW at time 10. At this time, via the fast response strategy, the energy storage charging power drops from 100 kW to 80 kW (see Figure 5 es_tar in the second figure). However, due to a certain time delay in the execution of the energy storage device power (see Figure 5 es_now in the second figure), there is a slight overload on the transformer at this moment. But at time 11, the energy storage device power is executed in place, and the transformer power returns to normal (see Figure 5 gd_now in the first figure); at time 28, the sudden increase in the substation load power causes 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), and the transformer power immediately returns below the set overload power (see Figure 5 gd_now and gd_max in the first figure); at time 49, the user sets the target charging power of the energy storage to be reduced from the original 100 kW to 40 kW (see the curve es_tar). From Figure 5 the control target curve es_set and the real-time power curve es_now of the energy storage in the second figure, it can be seen that the energy storage can also respond immediately in place, achieving fast regulation of the substation power.

[0031] See Figure 5 The third figure shows the time from the start of data collection to the issuance of the regulation command for each fast regulation. It can be seen from the figure that the duration from data collection to command issuance is generally within 50 ms. In individual periods, due to the triggering of the global plan resulting in resource occupation, the fast decision-making time is extended to about 300 ms. Generally speaking, the response time of the fast regulation is much faster than the technical requirement of 500 ms, reflecting the superiority of the solution described in the present invention in the aspect of overload and reverse current prevention regulation of the energy storage substation.

[0032] In the description of the present invention, the descriptions referring to terms such as "one embodiment", "some embodiments", "in this embodiment", "specific examples", or "some examples" mean that the specific features, mechanisms, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0033] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope 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 structure of an energy storage site, wherein the high-voltage topology structure 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 a plurality of 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 the 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.

2. The overload and backflow prevention rapid response control method according to claim 1 is characterized in that: The basic parameters of the energy storage site obtained in step S2 include the whole-station 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 is 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 previous global planning has exceeded the set time.

4. The overload and backflow prevention rapid response control method according to claim 2 is characterized in that: In step S2, the energy storage rated charging power and the energy storage rated discharging power are corrected by 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 SOC upper limit value; 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: 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: Step S41, obtaining the 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 for each of the secondary transformers, obtaining the excess demand value of the 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, 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 according to 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 according to 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 according to the secondary round target power reduction, the real-time power of the energy storage unit and the first round target power reduction.

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

7. The overload and backflow prevention rapid response control method according to claim 5, 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 maximum reducible power of each of the secondary transformers; Indicates The overload power of each of the secondary transformers; Indicates The second transformer The real-time power of each of the energy storage units; Indicates The second transformer the minimum power of each of the energy storage units; Indicates The number of each energy storage unit mounted under each of the secondary transformers.

8. The overload and backflow prevention rapid response control method according to claim 5, characterized in that: In step S44, the secondary reducible power is obtained by the following calculation formula: ， in, represents the secondary reducible power; Indicates The second transformer The real-time power of each of the energy storage units; Indicates the first round of target power reduction; Indicates The second transformer The minimum power of each of the energy storage units.

9. The overload and backflow prevention rapid response control method according to claim 5, characterized in that: In step S45, the secondary round target reduction power is obtained by the following calculation formula: ， in, Indicates the secondary round target power reduction; Indicates The overload power of each of the secondary transformers; represents the secondary reducible power; Indicates The number of each energy storage unit mounted under each of the secondary transformers.

10. The overload and backflow prevention rapid response control method according to claim 5, characterized in that: In step S45, the target execution power is obtained by the following calculation formula: ， in, represents the target execution power; Indicates The second transformer The real-time power of each of the energy storage units; Indicates the first round of target power reduction; Indicates the secondary round target power reduction; Indicates The number of each energy storage unit mounted under each of the secondary transformers.

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