Cooperative treatment method and system for single-phase heavy overload and three-phase load imbalance of power distribution network station area

Abstract

The invention discloses a cooperative treatment method for single-phase heavy overload and three-phase load imbalance in a power distribution network area. The method comprises the following steps: additionally installing a three-phase energy storage system in a target power distribution network system; monitoring data information of the target power distribution network system in real time; when single-phase heavy overload occurs, generating a single-phase heavy overload energy storage control instruction according to the working parameters of the added three-phase energy storage system; when three-phase load imbalance occurs, a three-phase load imbalance governance optimization model is constructed, and a load imbalance energy storage control instruction is solved and generated; superposing the obtained control instructions, and obtaining a final charge-discharge control instruction of the three-phase energy storage system based on the SOC state constraint of the three-phase energy storage system; and according to the obtained charging and discharging control instruction of the three-phase energy storage system, completing cooperative treatment of single-phase heavy overload and three-phase load imbalance of the target power distribution network station area. The invention also discloses a system for realizing the cooperative treatment method for the single-phase heavy overload and the three-phase load imbalance of the power distribution network station area. The method is high in reliability, good in accuracy and high in efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of electrical automation, and particularly relates to a collaborative governance method and system for single-phase heavy overload and three-phase load imbalance in a distribution network substation area. Background Art

[0002] With the development of economic technology and the improvement of people's living standards, electric energy has become an essential secondary energy source in people's production and life, bringing endless convenience to people's production and life. Therefore, ensuring the stable and reliable supply of electric energy has become one of the most important tasks of the power system.

[0003] The problems of three-phase load imbalance and heavy overload in the distribution network substation area are the main factors affecting the power supply quality of the low-voltage distribution network. In rural power grids, this problem is particularly serious, and the reasons are as follows: First, affected by climate and the return of migrant workers, the problem of short-term heavy overload is significant; second, due to the lack of proper management of business expansion, loads are concentrated on the side-phase conductors, resulting in a normalized three-phase load imbalance. Among them, the three-phase load imbalance will lead to an increase in line losses and distribution transformer losses, endangering the safety of electrical equipment, and heavy overload will cause the distribution transformer to operate in a non-economic state, accelerating insulation aging and shortening the operating life.

[0004] At present, the traditional governance solutions are specifically as follows: for the problem of three-phase load imbalance, it is achieved by installing a specific balance adjustment device; for the problem of heavy overload, it is achieved by means of distribution transformer capacity increase transformation, three-phase load adjustment, etc. However, the distribution transformer capacity increase transformation solution has a high cost and a long transformation time; while the method of adjusting the three-phase load is difficult to adapt to the situation where the average load is already overloaded. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a collaborative governance method for single-phase heavy overload and three-phase load imbalance in a distribution network substation area with high reliability, good accuracy and high efficiency.

[0006] Another purpose of the present invention is to provide a system for implementing the collaborative governance method for single-phase heavy overload and three-phase load imbalance in the distribution network substation area.

[0007] The collaborative governance method for single-phase heavy overload and three-phase load imbalance in the distribution network substation area provided by the present invention includes the following steps:

[0008] S1. Install a three-phase energy storage system in the target distribution network system;

[0009] S2. Real-time monitor the data information of the target distribution network system;

[0010] S3. According to the data information obtained in step S2, when single-phase heavy overload occurs, generate a single-phase heavy overload energy storage control instruction according to the operating parameters of the installed three-phase energy storage system;

[0011] S4. According to the data information obtained in step S2, when three-phase load imbalance occurs, taking the minimization of three-phase unbalance degree as the goal and the charge-discharge power limit and the inter-phase power difference limit as the constraint conditions, construct an optimization model for the treatment of three-phase load imbalance;

[0012] S5. Solve the optimization model for the treatment of three-phase load imbalance constructed in step S4 to generate a load imbalance energy storage control instruction;

[0013] S6. Superimpose the control instructions obtained in step S3 and step S5, and based on the SOC state constraint of the three-phase energy storage system, obtain the final charge-discharge control instruction of the three-phase energy storage system;

[0014] S7. According to the charge-discharge control instruction of the three-phase energy storage system obtained in step S6, complete the coordinated treatment of single-phase heavy overload and three-phase load imbalance in the target distribution network substation area.

[0015] The installation of the three-phase energy storage system in the target distribution network system described in step S1 specifically includes the following steps:

[0016] Install a three-phase energy storage system in the target distribution network system;

[0017] The described three-phase energy storage system includes a three-phase energy storage device and a corresponding energy storage converter.

[0018] The occurrence of single-phase heavy overload described in step S3 specifically includes the following steps:

[0019] According to the data information obtained in step S2, calculate the load rate of each phase line by using the following formula:

[0020]

[0021] In the formula is the load rate of phase and the value of is A, B or C; is rated the active power of phase

[0022] When it is determined that single-phase heavy overload occurs in phase, and λ set is the set load rate threshold.

[0023] Generate a single-phase heavy overload energy storage control instruction according to the operating parameters of the installed three-phase energy storage system in step S3, specifically including the following steps:

[0024] For the phase line with single-phase heavy overload, use the following formula to generate a single-phase heavy overload energy storage control instruction:

[0025]

[0026] In the formula is the heavy overload energy storage control instruction of phase; P up is the upper limit value of the single-phase output power of the energy storage converter, and S pcs is the capacity of the energy storage converter;

[0027] According to the generated single-phase heavy overload energy storage control instruction, obtain the load active power of the target distribution network system after single-phase heavy overload treatment, expressed as

[0028]

[0029] In the formula is after single-phase heavy overload treatment the active power of phase.

[0030] The occurrence of three-phase load imbalance in step S4 specifically includes the following steps:

[0031] Calculate the three-phase load imbalance degree l ub is

[0032] If the three-phase load imbalance degree l ub is greater than the set imbalance degree threshold, it is determined that three-phase load imbalance has occurred.

[0033] Taking the minimization of the three-phase imbalance degree as the goal and the charge and discharge power limit and the inter-phase power difference limit as the constraint conditions, construct an optimization model for the treatment of three-phase load imbalance in step S4, specifically including the following steps:

[0034] It is divided into four different scenarios, and an optimization model for the treatment of three-phase load imbalance is constructed respectively:

[0035] Scenario 1 - No single-phase heavy overload occurs and three-phase load imbalance occurs:

[0036] The constructed optimization model for the treatment of three-phase load imbalance is expressed as

[0037]

[0038] In the formula, l ub-1is the unbalance degree of the three-phase load after collaborative governance in Scenario 1, and is the load power of the phase after the three-phase load unbalance governance, and is the load unbalance energy storage control instruction for the d_limit phase; P

[0039] Scenario 2 - Single-phase heavy overload occurs in any one phase, and three-phase load unbalance occurs:

[0040] Set single-phase heavy overload occurs in the phase, and no single-phase heavy overload occurs in the phase and the

[0041]

[0042] In the formula takes values of A, B, or C, takes values of A, B, or C, takes values of A, B, or C, and l ub-2 is the unbalance degree of the three-phase load after collaborative governance in Scenario 2, and where

[0043] Scenario 3 - Single-phase heavy overload occurs in any two phases, and three-phase load unbalance occurs:

[0044] Set single-phase heavy overload occurs in the phase and the phase, and no single-phase heavy overload occurs in the

[0045]

[0046] In the formula, l ub-3 is the unbalance degree of the three-phase load after collaborative governance in Scenario 3, and where

[0047] Scenario 4 - Single-phase heavy overload occurs in all three phases, and three-phase load unbalance occurs:

[0048] At this time, only the single-phase heavy overload governance is carried out according to Step S3, and the single-phase heavy overload energy storage control instruction is generated; while the single-phase heavy overload governance is completed, the three-phase load unbalance governance is completed.

[0049] The solution of the three-phase load imbalance governance optimization model constructed in step S4 described in step S5 specifically includes the following steps:

[0050] For the three-phase load imbalance governance optimization model constructed in step S4, the particle swarm optimization algorithm is used for solution.

[0051] The superposition of the control instructions obtained in steps S3 and S5 described in step S6, and based on the SOC state constraint of the three-phase energy storage system, the charge and discharge control instructions of the final three-phase energy storage system are obtained, which specifically includes the following steps:

[0052] Superpose the control instructions obtained in steps S3 and S5;

[0053] When the SOC state of the three-phase energy storage system is between the set SOC lower limit value and the SOC upper limit value, the superimposed control instruction is used as the charge and discharge control instruction of the final three-phase energy storage system;

[0054] If the SOC state of the three-phase energy storage system is less than the set SOC lower limit value, the collaborative governance function of the three-phase energy storage system is turned off. After charging the three-phase energy storage system to the set SOC value, the collaborative governance function of the three-phase energy storage system is turned on again;

[0055] If the SOC state of the three-phase energy storage system is greater than the set SOC upper limit value, the three-phase load imbalance governance function of the three-phase energy storage system is turned off, and only the three-phase heavy overload governance function of the three-phase energy storage system is turned on; until the SOC state of the three-phase energy storage system is less than the set SOC upper limit value, and then the three-phase load imbalance governance function of the three-phase energy storage system is turned on.

[0056] The present invention also provides a system for implementing the collaborative governance method for single-phase heavy overload and three-phase load imbalance in a distribution network substation area, including an energy storage installation module, a data acquisition module, a first generation module, a model building module, a second generation module, an instruction generation module, and a collaborative governance module; the energy storage installation module, the data acquisition module, the first generation module, the model building module, the second generation module, the instruction generation module, and the collaborative governance module are connected in series in sequence; the energy storage installation module is used to install a three-phase energy storage system in the target distribution network system and upload data information to the data acquisition module; the data acquisition module is used to monitor the data information of the target distribution network system in real time according to the received data information and upload the data information to the first generation module; the first generation module is used to generate a single-phase heavy overload energy storage control instruction according to the received data information and the acquired data information, and when a single-phase heavy overload occurs, according to the working parameters of the installed three-phase energy storage system, and upload the data information to the model building module; the model building module is used to construct an optimization model for the governance of three-phase load imbalance with the goal of minimizing the three-phase imbalance degree and with the charge and discharge power limit and the inter-phase power difference limit as constraints according to the received data information and the acquired data information, and when a three-phase load imbalance occurs, and upload the data information to the second generation module; the second generation module is used to solve the constructed optimization model for the governance of three-phase load imbalance according to the received data information, generate a load imbalance energy storage control instruction, and upload the data information to the instruction generation module; the instruction generation module is used to superimpose the obtained control instructions according to the received data information, and based on the SOC state constraint of the three-phase energy storage system, obtain the final charge and discharge control instruction of the three-phase energy storage system, and upload the data information to the collaborative governance module; the collaborative governance module is used to complete the collaborative governance of single-phase heavy overload and three-phase load imbalance in the target distribution network substation area according to the received data information and the obtained charge and discharge control instruction of the three-phase energy storage system.

[0057] The collaborative governance method and system for single-phase heavy overload and three-phase load imbalance in the distribution network substation area provided by the present invention, by constructing corresponding governance models for single-phase heavy overload and three-phase load imbalance, and combining the operating status and operating limit information of the three-phase energy storage system, not only realizes the collaborative governance of single-phase heavy overload and three-phase load imbalance in the distribution network substation area, but also has higher reliability, better accuracy, and higher efficiency. Brief Description of the Drawings

[0058] Figure 1 It is a schematic flow chart of the method of the present invention.

[0059] Figure 2 It is a schematic diagram of the functional modules of the system of the present invention. Detailed Embodiments

[0060] Such as Figure 1The following is a schematic flow diagram of the method of the present invention: The collaborative governance method for single-phase heavy overload and three-phase load imbalance in a distribution network substation area disclosed in the present invention includes the following steps:

[0061] S1. Install a three-phase energy storage system in the target distribution network system; specifically, it includes the following steps:

[0062] Install a three-phase energy storage system in the target distribution network system;

[0063] The three-phase energy storage system includes a three-phase energy storage device and a corresponding energy storage converter;

[0064] S2. Real-time monitor the data information of the target distribution network system;

[0065] S3. According to the data information obtained in step S2, when a single-phase heavy overload occurs, generate a single-phase heavy overload energy storage control instruction according to the working parameters of the installed three-phase energy storage system; specifically, it includes the following steps:

[0066] According to the data information obtained in step S2, use the following formula to calculate the load rate of each phase line:

[0067]

[0068] In the formula is the load rate of phase The value of is A, B or C; is the active power of phase rated is the rated active power of a single phase, and approximately can be considered to take the value of the rated capacity S of the distribution transformer t of

[0069] When it is determined that phase appears single-phase heavy overload, and λ set is the set load rate threshold;

[0070] Then, for the phase line with single-phase heavy overload, use the following formula to generate a single-phase heavy overload energy storage control instruction:

[0071]

[0072] In the formula is the heavy overload energy storage control instruction of phase means the energy storage converter discharges, means the energy storage converter charges; P up is the upper limit value of the single-phase output power of the energy storage converter, and S pcsis the capacity of the energy storage converter;

[0073] According to the generated single-phase heavy overload energy storage control instruction, the active power of the load of the target distribution network system after single-phase heavy overload treatment is obtained, expressed as

[0074]

[0075] In the formula is the phase active power after single-phase heavy overload treatment;

[0076] S4. According to the data information obtained in step S2, when three-phase load imbalance occurs, with the goal of minimizing the three-phase imbalance degree and the charge and discharge power limit and the inter-phase power difference limit as the constraint conditions, a three-phase load imbalance treatment optimization model is constructed; specifically including the following steps:

[0077] Calculate the three-phase load imbalance degree l ub is

[0078] If the three-phase load imbalance degree l ub is greater than the set imbalance degree threshold, it is determined that three-phase load imbalance occurs;

[0079] It is divided into four different scenarios, and a three-phase load imbalance treatment optimization model is constructed respectively:

[0080] Scenario 1 - No single-phase heavy overload occurs, and three-phase load imbalance occurs:

[0081] The constructed three-phase load imbalance treatment optimization model is expressed as

[0082]

[0083] In the formula, l ub-1 is the three-phase load imbalance degree after collaborative treatment in Scenario 1, and is the phase load power after three-phase load imbalance treatment, and is phase load imbalance energy storage control instruction; P d limit is the set inter-phase power difference limit threshold;

[0084] Scenario 2 - Single-phase heavy overload occurs in any one phase, and three-phase load imbalance occurs:

[0085] Set phase has a single-phase heavy overload, phase and phase do not have a single-phase heavy overload; the constructed three-phase load imbalance treatment optimization model is expressed as

[0086]

[0087] In the formula takes values of A, B, or C, takes values of A, B, or C, takes values of A, B, or C, and l ub-2 is the unbalance degree of the three-phase load after collaborative governance in Scenario 2, and wherein

[0088] Scenario 3 - Single-phase heavy overload occurs in any two phases, and three-phase load unbalance occurs:

[0089] It is assumed that phase and phase both have single-phase heavy overload, phase has no single-phase heavy overload; the constructed optimization model for three-phase load unbalance governance is expressed as

[0090]

[0091] In the formula, l ub-3 is the unbalance degree of the three-phase load after collaborative governance in Scenario 3, and wherein

[0092] Scenario 4 - Single-phase heavy overload occurs in all three phases, and three-phase load unbalance occurs:

[0093] At this time, only the single-phase heavy overload governance is carried out according to Step S3, and a single-phase heavy overload energy storage control instruction is generated; while the single-phase heavy overload governance is completed, the three-phase load unbalance governance is completed; therefore, for Scenario 4, there is no need to separately carry out the three-phase load unbalance governance;

[0094] S5. Solve the optimization model for three-phase load unbalance governance constructed in Step S4 to generate a load unbalance energy storage control instruction; specifically, it includes the following steps:

[0095] For the optimization model for three-phase load unbalance governance constructed in Step S4, use the particle swarm optimization algorithm to solve it and generate a load unbalance energy storage control instruction; the particle swarm optimization algorithm has the characteristics of simple algorithm, easy implementation, and fast convergence speed;

[0096] S6. Superimpose the control instructions obtained in Step S3 and Step S5, and based on the SOC state constraint of the three-phase energy storage system, obtain the final charge and discharge control instruction of the three-phase energy storage system; specifically, it includes the following steps:

[0097] Superimpose the control instructions obtained in Step S3 and Step S5;

[0098] When the SOC state of the three-phase energy storage system is between the set lower SOC limit value and the upper SOC limit value (preferably 90%), the superimposed control instruction is used as the final charge-discharge control instruction for the three-phase energy storage system;

[0099] Considering that the treatment of heavy overload will cause the energy storage to discharge, and the treatment of three-phase imbalance may either charge or discharge, therefore:

[0100] If the SOC state of the three-phase energy storage system is less than the set lower SOC limit value, the collaborative governance function of the three-phase energy storage system is turned off. After charging the three-phase energy storage system to the set SOC value, the collaborative governance function of the three-phase energy storage system is turned on again;

[0101] If the SOC state of the three-phase energy storage system is greater than the set upper SOC limit value, the three-phase load imbalance governance function of the three-phase energy storage system is turned off, and only the single-phase heavy overload governance function of the three-phase energy storage system is turned on; until the SOC state of the three-phase energy storage system is less than the set upper SOC limit value, then the three-phase load imbalance governance function of the three-phase energy storage system is turned on again;

[0102] S7. According to the charge-discharge control instruction of the three-phase energy storage system obtained in step S6, complete the collaborative governance of single-phase heavy overload and three-phase load imbalance in the target distribution network substation area.

[0103] Such as Figure 2The following is a schematic diagram of the functional modules of the system of the present invention: The system for implementing the collaborative governance method of single-phase heavy overload and three-phase load imbalance in the distribution network substation area disclosed in the present invention includes an energy storage installation module, a data acquisition module, a first generation module, a model building module, a second generation module, an instruction generation module, and a collaborative governance module; the energy storage installation module, the data acquisition module, the first generation module, the model building module, the second generation module, the instruction generation module, and the collaborative governance module are connected in series in sequence; the energy storage installation module is used to install a three-phase energy storage system in the target distribution network system and upload the data information to the data acquisition module; the data acquisition module is used to monitor the data information of the target distribution network system in real time according to the received data information and upload the data information to the first generation module; the first generation module is used to generate a single-phase heavy overload energy storage control instruction according to the received data information and the obtained data information, and when a single-phase heavy overload occurs, according to the working parameters of the installed three-phase energy storage system, and upload the data information to the model building module; the model building module is used to build an optimization model for the governance of three-phase load imbalance with the goal of minimizing the three-phase imbalance degree and with the charge and discharge power limit and the inter-phase power difference limit as the constraint conditions according to the received data information and the obtained data information when a three-phase load imbalance occurs, and upload the data information to the second generation module; the second generation module is used to solve the built optimization model for the governance of three-phase load imbalance according to the received data information, generate a load imbalance energy storage control instruction, and upload the data information to the instruction generation module; the instruction generation module is used to superimpose the obtained control instructions according to the received data information and obtain the final charge and discharge control instruction of the three-phase energy storage system based on the SOC state constraint of the three-phase energy storage system, and upload the data information to the collaborative governance module; the collaborative governance module is used to complete the collaborative governance of single-phase heavy overload and three-phase load imbalance in the target distribution network substation area according to the received data information and the obtained charge and discharge control instruction of the three-phase energy storage system.

Claims

1. A method for collaboratively managing single-phase heavy overload and three-phase load imbalance in a distribution network area, comprising the following steps: S1. Install a three-phase energy storage system in the target distribution network system; S2. Real-time monitoring of data information of the target distribution network system; S3. According to the data information obtained in step S2, when a single-phase heavy overload occurs, a single-phase heavy overload energy storage control instruction is generated according to the operating parameters of the installed three-phase energy storage system; S4. According to the data information obtained in step S2, when the three-phase load is unbalanced, a three-phase load imbalance management optimization model is constructed with the goal of minimizing the three-phase imbalance and the constraints of charge and discharge power limit and phase power difference limit; S5. Solve the three-phase load imbalance management optimization model constructed in step S4 to generate load imbalance energy storage control instructions; S6. Superimposing the control instructions obtained in step S3 and step S5, and obtaining the final charge and discharge control instructions of the three-phase energy storage system based on the SOC state constraint of the three-phase energy storage system; S7. Based on the charge and discharge control instructions of the three-phase energy storage system obtained in step S6, the coordinated management of single-phase heavy overload and three-phase load imbalance in the target distribution network area is completed.

2. The method for coordinating single-phase heavy overload and three-phase load imbalance in distribution network area according to claim 1 is characterized in that The step S1 of installing a three-phase energy storage system in the target distribution network system specifically includes the following steps: Install a three-phase energy storage system in the target distribution network system; The three-phase energy storage system includes a three-phase energy storage device and a corresponding energy storage converter.

3. The method for coordinating single-phase heavy overload and three-phase load imbalance in distribution network area according to claim 2 is characterized in that The single-phase heavy overload described in step S3 specifically includes the following steps: According to the data information obtained in step S2, the load rate of each phase line is calculated using the following formula: In the formula for Phase load factor, The value of is A, B or C; for Phase active power; P rated is the rated active power of single phase; when When Phase has a single-phase heavy overload, λ set is the set load rate threshold.

4. The method for coordinating single-phase heavy overload and three-phase load imbalance in distribution network area according to claim 3 is characterized in that The step S3 described in which a single-phase heavy overload energy storage control instruction is generated according to the working parameters of the installed three-phase energy storage system specifically includes the following steps: For the phase line with single-phase heavy overload, the following formula is used to generate the single-phase heavy overload energy storage control instruction: In the formula for Phase heavy overload energy storage control instruction; P up is the upper limit of the single-phase output power of the energy storage converter, and S pcs is the capacity of the energy storage converter; According to the generated single-phase heavy overload energy storage control instruction, the load active power of the target distribution network system after single-phase heavy overload control is obtained, which is expressed as In the formula After single-phase heavy overload control Phase active power.

5. The method for coordinating single-phase heavy overload and three-phase load imbalance in distribution network area according to claim 4 is characterized in that The occurrence of three-phase load imbalance described in step S4 specifically includes the following steps: The three-phase load imbalance degree l is calculated ub for If the three-phase load is unbalanced, ub If the value is greater than the set imbalance threshold, it is determined that three-phase load imbalance occurs.

6. The method for coordinating single-phase heavy overload and three-phase load imbalance in distribution network area according to claim 5 is characterized in that The goal of step S4 is to minimize the three-phase imbalance, and the charging and discharging power limit and the phase power difference limit are used as constraints to construct a three-phase load imbalance management optimization model, which specifically includes the following steps: It is divided into four different scenarios, and three-phase load imbalance management optimization models are constructed respectively: Scenario 1: No single-phase overload occurs, and three-phase load imbalance occurs: The constructed three-phase load imbalance management optimization model is expressed as Where l ub-1 is the three-phase load imbalance degree after collaborative governance in scenario 1, and After the three-phase load imbalance is treated The load power of each phase, and for Phase load imbalance energy storage control instruction; P d_limit is the set phase-to-phase power difference limit threshold; Scenario 2: Any phase is severely overloaded and the three-phase load is unbalanced: set up Single-phase heavy overload occurs. Harmony There is no single-phase heavy overload in the phase; the constructed three-phase load imbalance management optimization model is expressed as In the formula The value of is A, B or C, The value of is A, B or C, The value of is A, B or C, and l ub-2 is the three-phase load imbalance degree after collaborative governance in scenario 2, and in Scenario 3 - Single-phase heavy overload occurs on any two phases, and three-phase load imbalance occurs: set up Harmony Single-phase heavy overload occurs in all phases. There is no single-phase heavy overload in the phase; the constructed three-phase load imbalance management optimization model is expressed as Where l ub-3 is the three-phase load imbalance degree after collaborative governance in scenario 3, and in Scenario 4: All three phases are severely overloaded, and the three-phase load is unbalanced: At this time, only single-phase heavy overload management is performed according to step S3, and a single-phase heavy overload energy storage control instruction is generated; while completing the single-phase heavy overload management, the three-phase load imbalance management is completed.

7. The method for coordinating single-phase heavy overload and three-phase load imbalance in a distribution network area according to claim 6 is characterized in that Step S5 solves the three-phase load imbalance management optimization model constructed in step S4, specifically including the following steps: The three-phase load imbalance management optimization model constructed in step S4 is solved by using a particle swarm optimization algorithm.

8. The method for coordinating single-phase heavy overload and three-phase load imbalance in distribution network area according to claim 7 is characterized in that The control instructions obtained in step S3 and step S5 are superimposed in step S6, and the final charge and discharge control instructions of the three-phase energy storage system are obtained based on the SOC state constraint of the three-phase energy storage system, which specifically includes the following steps: Superimposing the control instructions obtained in step S3 and step S5; When the SOC state of the three-phase energy storage system is between the set SOC lower limit value and the SOC upper limit value, the superimposed control instruction is used as the final charge and discharge control instruction of the three-phase energy storage system; If the SOC state of the three-phase energy storage system is less than the set SOC lower limit, the collaborative management function of the three-phase energy storage system is turned off, and the collaborative management function of the three-phase energy storage system is turned on after the three-phase energy storage system is charged to the set SOC value; If the SOC state of the three-phase energy storage system is greater than the set SOC upper limit value, the three-phase load imbalance management function of the three-phase energy storage system will be turned off, and only the heavy overload management function of the three-phase energy storage system will be turned on; until the SOC state of the three-phase energy storage system is less than the set SOC upper limit value, the three-phase load imbalance management function of the three-phase energy storage system will be turned on.

9. A system for realizing the coordinated management method of single-phase heavy overload and three-phase load imbalance in a distribution network area according to any one of claims 1 to 8, characterized in that It includes an energy storage installation module, a data acquisition module, a first generation module, a model building module, a second generation module, an instruction generation module and a collaborative governance module; the energy storage installation module, the data acquisition module, the first generation module, the model building module, the second generation module, the instruction generation module and the collaborative governance module are connected in series in sequence; the energy storage installation module is used to install a three-phase energy storage system in the target distribution network system, and upload the data information to the data acquisition module; the data acquisition module is used to monitor the data information of the target distribution network system in real time according to the received data information, and upload the data information to the first generation module; The first generation module is used to generate a single-phase heavy overload energy storage control instruction according to the received data information and the acquired data information when a single-phase heavy overload occurs according to the working parameters of the installed three-phase energy storage system, and upload the data information to the model building module; The model building module is used to construct a three-phase load imbalance management optimization model based on the received data information and the acquired data information, when three-phase load imbalance occurs, with the goal of minimizing the three-phase imbalance, and with the charge and discharge power limit and the phase power difference limit as constraints, and upload the data information to the second generation module; The second generation module is used to solve the constructed three-phase load imbalance management optimization model according to the received data information, generate load imbalance energy storage control instructions, and upload the data information to the instruction generation module; The instruction generation module is used to superimpose the obtained control instructions according to the received data information, and obtain the final charging and discharging control instructions of the three-phase energy storage system based on the SOC state constraints of the three-phase energy storage system, and upload the data information to the collaborative governance module; the collaborative governance module is used to complete the collaborative governance of single-phase heavy overload and three-phase load imbalance in the target distribution network area according to the received data information and the obtained charging and discharging control instructions of the three-phase energy storage system.

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