Energy storage control system and method for wind and solar high penetration areas

Abstract

The present invention discloses an energy storage control system for wind and solar high penetration area, which includes a power ratio calculation module, a power ratio judgment module, a new energy power generation capacity state determination module, a charging threshold condition judgment module, an energy storage output power calculation module, a charging cut-off judgment module, a power ratio and discharge threshold comparison module, an energy storage remaining charge capacity judgment module, an energy storage discharge power value determination module and a discharge cut-off judgment module; the present invention comprehensively considers multiple factors such as wind and solar power generation, non-large-scale power generation, load peak and valley conditions and energy storage operation status, formulates different energy storage response strategies, and based on the above factors, respectively gives power output control formulas and control parameter setting requirements under energy storage charging and discharging regulation, so as to suppress the volatility of wind and solar power generation, prevent the reverse flow phenomenon when wind and solar power generation exceeds the load power demand, and improve the new energy consumption capacity.

Description

Technical Field

[0001] The present invention relates to the field of electrochemical energy storage technology, and specifically to an energy storage control system and method for wind and solar high penetration areas. Background Art

[0002] Vigorously developing new energy and increasing the proportion of non-fossil energy consumption, mainly new energy, is a requirement for energy transformation. As an important carrier of energy supply and consumption, it is of great significance to build a new power system with new energy as the main body and increase the proportion of clean electricity consumption. It is estimated that by 2030 and 2060, the proportion of new energy power generation in my country will exceed 25% and 60% respectively, and the power supply will move towards a gradual zero-carbon direction. In recent years, my country's new energy power generation technology has developed rapidly, and the cost iteration is fast. Large-scale centralized power generation has high requirements for geographical and resource endowments, and requires the construction of transmission channels. Distributed new energy power generation has the advantages of flexible installation, effective improvement of resource utilization, and convenience for local consumption, and the installed capacity has increased dramatically year by year.

[0003] However, the volatility and periodicity of renewable energy power generation are obvious. The maximum daily fluctuation of wind power can reach 80% of the installed capacity, and it also shows certain anti-peak characteristics; photovoltaic power generation is affected by the changes of day and night, weather, and moving clouds, and is also intermittent and volatile. As distributed energy further penetrates the distribution network, high-proportion wind and solar power generation stations will face greater power balance and stability problems. Fully exploring and utilizing controllable resources represented by electrochemical energy storage has become an important response method. Although the application of electrochemical energy storage is relatively mature in the power field, in the application scenarios of substations, it is currently mostly carried out by relatively rough means. In high-penetration substations, there is a lack of refined control methods that take into account the consumption of new energy and prevent power flow reversal and load peak regulation.

[0004] CN112583032 A discloses a method for configuring a storage strategy based on load demand. The method executes a new energy consumption strategy based on the fact that the power of the new energy grid is greater than zero; and executes an electric energy economic strategy and an operation stability strategy respectively based on the fact that the power of the new energy grid is equal to zero and whether it is in the peak shaving and valley filling time window. The advantage of this method is that it reduces the pressure of the load peak-valley difference on the safe and stable operation of the power grid to a certain extent, and improves the power grid's ability to absorb new energy. However, the disadvantage is that this method only considers whether there is new energy power generation to formulate and execute the energy storage operation strategy, which is relatively rough from the perspective of interval division. Secondly, the impact of different new energy power generation capabilities on the power grid, energy storage and load operation and the corresponding response strategy of energy storage are not specifically considered or explained in the invention, which may eventually lead to poor operation results.

[0005] CN110707733A discloses a method for dynamic self-balancing control of active power consumption of new energy in low-voltage substations. The method collects relevant data, constructs a dynamic balance control strategy, and obtains a load distribution plan by inputting the collected data into the dynamic balance control strategy to reduce the neutral line current. The invention improves the three-phase imbalance problem of substations with new energy access to a certain extent through intelligent adjustment means, achieves the best possible balance between new energy power generation and load power consumption, and improves the stability of the power system. However, the invention is only applicable to scenarios where the new energy power generation capacity is less than the power load all year round. At the same time, the dynamic balance control strategy based on genetic algorithms has limitations in applicability, and the system is weak in coping with peak loads in substations. Summary of the invention

[0006] The purpose of the present invention is to provide an energy storage control system and method for wind and solar power stations with high penetration rates. The method takes into account stations with a high proportion of new energy access, changes in power generation capacity caused by the volatility and intermittency of new energy, and seasonality of station loads and daily electricity peak and valley characteristics. Through real-time tracking and rapid response of electrochemical energy storage, specific control methods are formulated to address the problems of new energy flow reverse transmission and absorption, thereby improving the safe and stable operation capabilities of the station and the new energy absorption capabilities.

[0007] To achieve this purpose, the energy storage control system designed by the present invention for wind and solar high penetration rate stations is characterized in that it includes a power ratio calculation module, a power ratio judgment module, a new energy power generation capacity state determination module, a charging threshold condition judgment module, an energy storage output power calculation module, a charging cut-off judgment module, a power ratio and discharge threshold comparison module, an energy storage remaining charge capacity judgment module, an energy storage discharge power value determination module and a discharge cut-off judgment module;

[0008] The power ratio calculation module is used to calculate the ratio of the new energy power generation to the load power of the substation;

[0009] The power ratio judgment module is used to judge whether the ratio of the new energy generation power to the load power of the substation meets the charging threshold condition;

[0010] The new energy power generation capacity state determination module is used to determine whether the new energy power generation capacity is in a high-power state or a non-high-power state according to the ratio of the new energy power generation power to the load power of the station area and the charging threshold condition when the ratio of the new energy power generation power to the load power of the station area meets the charging threshold condition;

[0011] The charging threshold condition judgment module is used to judge whether the remaining charge of the energy storage meets the charging threshold condition in the high-power state or the non-high-power state;

[0012] The energy storage output power calculation module is used to calculate the energy storage output power in the high-power state or the non-high-power state when the remaining energy storage charge meets the charging threshold, and charge the energy storage device with this power;

[0013] The charging cut-off judgment module is used to judge whether the energy storage device has reached the charging cut-off condition;

[0014] The power ratio and discharge threshold comparison module is used to determine whether the ratio of the new energy generation power to the area load power is less than the discharge threshold when the ratio of the new energy generation power to the area load power does not meet the charging threshold condition;

[0015] The energy storage remaining charge capacity judgment module is used to judge whether the energy storage remaining charge capacity meets the energy storage discharge threshold condition when the ratio of the new energy generation power to the load power of the station area is less than the discharge threshold;

[0016] The energy storage discharge power value determination module is used to determine the load state of the area when the remaining charge capacity of the energy storage meets the discharge threshold condition, and determine the energy storage discharge power value according to the load state of the area and the power generation power of new energy, and discharge at this power;

[0017] The discharge cut-off judgment module is used to judge whether the energy storage device has reached the discharge cut-off condition.

[0018] Beneficial effects of the present invention:

[0019] The present invention proposes a control method for energy storage in wind and solar power stations with high penetration rates. The method comprehensively considers multiple factors such as wind and solar power generation, peak and valley conditions, and energy storage operation status, and formulates different energy storage response strategies. Based on the above factors, power output control formulas and control parameter setting requirements under energy storage charging and discharging regulation are respectively given, so as to suppress the volatility of wind and solar power generation, prevent the occurrence of reverse flow when wind and solar power generation exceeds the load power demand, and at the same time improve the new energy absorption capacity and enhance the power balance capacity and stable operation capacity of the station. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 Flow chart of the method of the present invention DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] like Figure 1The energy storage control system for wind and solar high penetration area shown is characterized by: it includes a power ratio calculation module, a power ratio judgment module, a new energy power generation capacity state determination module, a charging threshold condition judgment module, an energy storage output power calculation module, a charging cut-off judgment module, a power ratio and discharge threshold comparison module, an energy storage remaining charge capacity judgment module, an energy storage discharge power value determination module and a discharge cut-off judgment module;

[0024] The power ratio calculation module is used to calculate the ratio of the new energy power generation (wind power generation and photovoltaic power generation to obtain wind and solar power generation) to the load power of the station area;

[0025] The power ratio judgment module is used to judge whether the ratio of the new energy generation power to the load power of the substation meets the charging threshold condition;

[0026] The new energy power generation capacity state determination module is used to determine whether the new energy power generation capacity is in a high-power state or a non-high-power state according to the ratio of the new energy power generation power to the load power of the station area and the charging threshold condition when the ratio of the new energy power generation power to the load power of the station area meets the charging threshold condition;

[0027] The charging threshold condition judgment module is used to judge whether the remaining charge of the energy storage meets the charging threshold condition in the high-power state or the non-high-power state;

[0028] The energy storage output power calculation module is used to calculate the energy storage output power in the high-power state or the non-high-power state when the remaining energy storage charge meets the charging threshold, and charge the energy storage device with this power;

[0029] The charging cut-off judgment module is used to judge whether the energy storage device has reached the charging cut-off condition;

[0030] The power ratio and discharge threshold comparison module is used to determine whether the ratio of the new energy power generation power to the load power of the station area is less than the discharge threshold k when the ratio of the new energy power generation power to the load power of the station area does not meet the charging threshold condition. 4 , k 4 The smaller the k, the more energy storage is required to discharge at the location where the wind and solar power generation capacity is weaker. 4 Ratio condition, judging whether to start discharge ratio condition, judging whether to start discharge;

[0031] The energy storage remaining charge capacity judgment module is used to judge whether the energy storage remaining charge capacity meets the energy storage discharge threshold condition when the ratio of the new energy generation power to the load power of the substation is less than the discharge threshold. The energy storage discharge threshold is the energy storage power, and judges whether the energy storage can respond to the startup request;

[0032] The energy storage discharge power value determination module is used to determine the load state of the substation when the remaining charge capacity of the energy storage meets the discharge threshold condition, and determine the energy storage discharge power value according to the substation load state and the new energy generation power, and discharge at this power;

[0033] The discharge cut-off judgment module is used to judge whether the energy storage device has reached the discharge cut-off condition.

[0034] In the above technical solution, the ratio k of the renewable energy power generation to the load power of the substation is calculated according to the following formula:

[0035]

[0036] Among them, P F is the wind power generated by real-time tracking, P V is the photovoltaic power generation power obtained by real-time tracking, P L To track the load power of the substation in real time.

[0037] In the above technical solution, the condition of satisfying the charging threshold is:

[0038] k>k 1

[0039] Among them, k is the ratio of renewable energy power generation to load power in the area, k 1 is the charging threshold, k 1 The larger the value, the more energy storage is required to be charged at a location with stronger wind and solar power generation capacity.

[0040] In the above technical solution, the two states of big hair and non-big hair are distinguished by the following formula:

[0041]

[0042] Start when the big hair condition is met, and the ratio k may change to less than or equal to k after startup 1 , it is still in the charging state, k is the ratio of the new energy power generation to the load power of the substation, k 1 is the charging threshold.

[0043] In the above technical solution, the charging threshold condition is:

[0044] SOC<SOC 1

[0045] Among them, SOC represents the remaining charge of energy storage. 1 Indicates the threshold value of energy storage chargeability;

[0046] The discharge threshold condition of energy storage is:

[0047] SOC>SOC 3

[0048] Among them, SOC represents the remaining charge of energy storage. 3 Indicates the discharge threshold of energy storage.

[0049] In the above technical solution, the energy storage output power is calculated using the following formula:

[0050] When the renewable energy power generation capacity is not high: P E =k 2 P L ;

[0051] When the renewable energy power generation capacity is in great condition:

[0052] P F +P G >P L +n 1 P e , early warning;

[0053] P F +P G -P L +m 0 P T <P e , P E =P F +P G -P L +m 0 P T

[0054] P F +P G -P L +m 0 P T ≥P e , P E =P e

[0055] Among them, P E is the energy storage output power, k 2 When the renewable energy generation capacity is not in high-capacity state, the relative load power coefficient of energy storage output is generally small, which is conducive to the consumption of renewable energy and is between 0 and 0.2. When the renewable energy generation capacity is in high-capacity state, n 1 The early warning coefficient for energy storage that wind and solar power generation is about to be reversed is generally between 0.85 and 0.95; P e is the rated output power of the energy storage device; m 0 is the minimum load factor of the distribution transformer, P F is the wind power generation power, P G is the photovoltaic power generation power, P L is the load power, P TTo distribute the transformer power and prevent potential safety hazards caused by low load.

[0056] In the above technical solution, the charging cut-off condition is that the ratio k of the new energy power generation to the load power of the substation is less than the wind and solar power generation capacity improvement turning point warning coefficient k 3 Or the remaining charge SOC of the energy storage is greater than the energy storage charging cut-off threshold SOC 2 , used to protect energy storage devices.

[0057] The discharge cut-off condition is that the ratio of the new energy power generation to the load power of the substation is greater than the wind and solar power generation capacity decline turning point warning coefficient k. 5 Or the remaining energy storage charge SOC is less than the energy storage discharge cut-off threshold SOC 4 , used to protect energy storage devices.

[0058] In the above technical solution, the load state of the station area includes high load rate, moderate load rate and low load rate, which are distinguished by the following formula:

[0059]

[0060] Where, m is the load factor of the distribution transformer, m 1 is the critical value of high load rate, m 2 It is the low load rate critical value.

[0061] In the above technical solution, the energy storage discharge power value is determined using the following formula:

[0062] P L -(P F +P G )≥m 1 P T , P E =P e ;

[0063] m 2 P T <P L -(P F +P G ) <m 1 P T , P E =n 2 P e ;

[0064] P L -(P F +P G ) <m 2 P T , P E =0

[0065] Among them, PE actually refers to the energy storage output power, including charging power and discharging power, n 2 The output power coefficient of energy storage under moderate load rate conditions is generally between 0.3 and 0.6, which can achieve slow discharge of energy storage. F is the wind power generation power, P G is the photovoltaic power generation power, P L is the load power, P T is the power of distribution transformer.

[0066] A method for energy storage control for wind and solar high penetration areas, which tracks the load power of the area in real time, obtains wind and solar power generation through wind power generation and photovoltaic power generation, calculates the ratio of new energy power generation to load power, and compares it with the power generation ratio valve criterion to determine the charging and discharging operation state of the energy storage device, and then obtains the energy storage output power value based on the remaining charge capacity of the energy storage, the power generation ratio, and the load rate of the distribution transformer to complete the autonomous operation of the energy storage. It specifically includes the following steps: Figure 2 As shown:

[0067] Step 1: Calculate the ratio of renewable energy power generation to the load power of the substation, and proceed to step 2;

[0068] Step 2: Determine whether the ratio of the new energy power generation power to the area load power meets the charging threshold condition. If the ratio of the new energy power generation power to the area load power meets the charging threshold condition, determine whether the new energy power generation capacity is in a high-power state or a non-high-power state according to the ratio of the new energy power generation power to the area load power and the charging threshold condition, and proceed to step 3;

[0069] If the ratio of the renewable energy power generation to the load power of the substation does not meet the charging threshold condition, proceed to step 6;

[0070] Step 3: Determine whether the remaining charge of the energy storage in the high-power state or the non-high-power state meets the charging threshold condition, and proceed to step 4;

[0071] Step 4: When the remaining charge of the energy storage device meets the charging threshold in the high-power state or the non-high-power state, the output power of the energy storage device is calculated, and the energy storage device is charged with the power, and the process goes to step 5. Otherwise, the energy storage device is not charged and waits for the next command.

[0072] Step 5: Determine whether the energy storage device has reached the charging cut-off condition. If the charging cut-off condition is reached, enter the next cycle and re-acquire the basic system for judgment and execution. If the charging cut-off condition is not reached, return to step 4;

[0073] Step 6: When the ratio of the renewable energy power generation to the load power of the area does not meet the charging threshold condition, determine whether the ratio of the renewable energy power generation to the load power of the area is less than the discharge threshold. If the ratio of the renewable energy power generation to the load power of the area is less than the discharge threshold, proceed to step 7. If neither the charging threshold nor the discharge threshold is met, stand still and wait for the next execution command.

[0074] Step 7: Determine whether the remaining energy storage charge capacity meets the energy storage discharge threshold condition. If the remaining energy storage charge capacity meets the discharge threshold condition, proceed to step 8; otherwise, do not discharge and wait for the next execution instruction;

[0075] Step 8: Determine the load status of the area, and determine the energy storage discharge power value according to the load status of the area and the power generation power of new energy, and discharge at this power, and enter step 9;

[0076] Step 9: Determine whether the energy storage device has reached the discharge cut-off condition. If so, enter the next cycle; if not, return to step 8.

[0077] Embodiment 1:

[0078] Charging threshold size k 1 Taking 0.9 means that the energy storage is required to be charged at a location with a high proportion of wind and solar power generation. When the renewable energy generation capacity is not high, the relative load power coefficient k of the energy storage output 2 Taking 0.1 is helpful for the consumption of new energy; the wind and solar power generation capacity increases the turning point warning coefficient k 3 Take 0.8; discharge valve threshold k 4 Taking 0.3 means that the energy storage is required to discharge at the location where the proportion of wind and solar power generation is low; the turning point warning coefficient k of the decline in wind and solar power generation capacity 5 Take 0.6.

[0079] Energy storage warning wind and solar power generation is about to reverse the warning coefficient n 1 Take 0.9; for the energy storage output power coefficient n under moderate load rate conditions in the substation 2 Take 0.4 to slowly release the stored new energy electricity and smooth the power curve of the substation.

[0080] Distribution transformer minimum load factor m 0 Taking 10% means preventing safety hazards caused by too low load.

[0081] Energy storage chargeable threshold SOC 1 Take 90%; energy storage charging cut-off threshold value SOC 2 Take 95%; used to protect the energy storage device. Energy storage discharge threshold value SOC 3 Take 30%; energy storage discharge cut-off threshold value SOC 4Taking 10% indicates a higher depth of energy storage discharge.

[0082] From the above parameter values ​​and formulas, we can obtain the energy storage charging and discharging state and the energy storage charging and discharging power under different wind and solar power generation and non-generation conditions, load peak and valley conditions, and energy storage operation conditions.

[0083] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. An energy storage control system for wind and solar high penetration areas, Features: It includes a power ratio calculation module, a power ratio judgment module, a new energy power generation capacity state determination module, a charging threshold condition judgment module, an energy storage output power calculation module, a charging cut-off judgment module, a power ratio and discharge threshold comparison module, an energy storage remaining charge capacity judgment module, an energy storage discharge power value determination module and a discharge cut-off judgment module; The power ratio calculation module is used to calculate the ratio of the new energy power generation to the load power of the substation; The power ratio judgment module is used to judge whether the ratio of the new energy generation power to the load power of the substation meets the charging threshold condition; The new energy power generation capacity state determination module is used to determine whether the new energy power generation capacity is in a high-power state or a non-high-power state according to the ratio of the new energy power generation power to the load power of the station area and the charging threshold condition when the ratio of the new energy power generation power to the load power of the station area meets the charging threshold condition; The charging threshold condition judgment module is used to judge whether the remaining charge of the energy storage meets the charging threshold condition in the high-power state or the non-high-power state; The energy storage output power calculation module is used to calculate the energy storage output power in the high-power state or the non-high-power state when the remaining energy storage charge meets the charging threshold, and charge the energy storage device with this power; The charging cut-off judgment module is used to judge whether the energy storage device has reached the charging cut-off condition; The power ratio and discharge threshold comparison module is used to determine whether the ratio of the new energy generation power to the area load power is less than the discharge threshold when the ratio of the new energy generation power to the area load power does not meet the charging threshold condition; The energy storage remaining charge capacity judgment module is used to judge whether the energy storage remaining charge capacity meets the energy storage discharge threshold condition when the ratio of the new energy generation power to the load power of the station area is less than the discharge threshold; The energy storage discharge power value determination module is used to determine the load state of the substation when the remaining charge capacity of the energy storage meets the discharge threshold condition, and determine the energy storage discharge power value according to the substation load state and the new energy generation power, and discharge at this power; The discharge cut-off judgment module is used to judge whether the energy storage device has reached the discharge cut-off condition; The energy storage output power is calculated using the following formula: When the renewable energy power generation capacity is not high: P E =k 2 P L ; When the renewable energy power generation capacity is in great condition: P F +P G >P L +n 1 P e , early warning; P F +P G -P L +m 0 P T <P e ,P E =P F +P G -P L +m 0 P T P F +P G -P L +m 0 P T ≥P e ,P E =P e Among them, P E is the energy storage output power, k 2 is the relative load power coefficient of energy storage output when the renewable energy power generation capacity is not in high state; when the renewable energy power generation capacity is in high state, n 1 P is the early warning coefficient of energy storage warning that wind and solar power generation is about to be reversed; e is the rated output power of the energy storage device; m 0 is the minimum load factor of the distribution transformer, P F is the wind power generation power, P G is the photovoltaic power generation power, P L is the load power, P T is the power of distribution transformer; The charging cut-off condition is that the ratio k of the new energy power generation to the load power of the substation is less than the wind and solar power generation capacity improvement turning point warning coefficient k 3 Or the remaining charge SOC of the energy storage is greater than the energy storage charging cut-off threshold SOC 2 ; The discharge cut-off condition is that the ratio of the new energy power generation to the load power of the substation is greater than the wind and solar power generation capacity decline turning point warning coefficient k. 5 Or the remaining energy storage charge SOC is less than the energy storage discharge cut-off threshold SOC 4 ; The load status of the station area includes high load rate, moderate load rate and low load rate, which are distinguished by the following formula: The energy storage discharge power value is determined using the following formula: P L -(P F +P G )≥m 1 P T ,P E =P e ; m 2 P T <P L -(P F +P G )<m 1 P T ,P E =n 2 P e ; P L -(P F +P G )<m 2 P T ,P E =0 Among them, n 2 is the energy storage output power coefficient under moderate load rate conditions, m 1 is the critical value of high load rate, m 2 is the low load factor critical value, and m is the distribution transformer load factor.

2. The energy storage control system for wind and solar high penetration areas according to claim 1, Features: The ratio k of the new energy generation power to the load power of the substation is calculated according to the following formula: Among them, P F is the wind power generated by real-time tracking, P V is the photovoltaic power generation power obtained by real-time tracking, P L To track the load power of the substation in real time.

3. The energy storage control system for wind and solar high penetration areas according to claim 1, Features: The charging threshold condition is: k>k 1 Among them, k is the ratio of renewable energy power generation to load power in the area, k 1 is the charging threshold.

4. The energy storage control system for wind and solar high penetration areas according to claim 1, Features: The two states of big hair and non-big hair are distinguished by the following formula: Among them, k is the ratio of renewable energy power generation to load power in the area, k 1 is the charging threshold.

5. The energy storage control system for wind and solar high penetration areas according to claim 1, Features: The charging threshold condition is: SOC<SOC 1 Among them, SOC represents the remaining charge of energy storage. 1 Indicates the threshold value of energy storage chargeability; The discharge threshold condition of energy storage is: SOC>SOC 3 Among them, SOC represents the remaining charge of energy storage. 3 Indicates the discharge threshold of energy storage.

6. An energy storage control method for wind and solar high penetration areas based on the system of claim 1, It is characterized in that It includes the following steps: Step 1: Calculate the ratio of renewable energy power generation to the load power of the substation, and proceed to step 2; Step 2: Determine whether the ratio of the new energy power generation power to the area load power meets the charging threshold condition. If the ratio of the new energy power generation power to the area load power meets the charging threshold condition, determine whether the new energy power generation capacity is in a high-power state or a non-high-power state according to the ratio of the new energy power generation power to the area load power and the charging threshold condition, and proceed to step 3; If the ratio of the renewable energy power generation to the load power of the substation does not meet the charging threshold condition, proceed to step 6; Step 3: Determine whether the remaining charge of the energy storage in the high-power state or the non-high-power state meets the charging threshold condition, and proceed to step 4; Step 4: When the remaining charge of the energy storage device meets the charging threshold in the high-power state or the non-high-power state, calculate the output power of the energy storage device in the high-power state or the non-high-power state, and charge the energy storage device with the power, and proceed to step 5; Step 5: Determine whether the energy storage device has reached the charging cut-off condition. If the charging cut-off condition is reached, enter the next cycle and re-acquire the basic system for judgment and execution. If the charging cut-off condition is not reached, return to step 4; Step 6: When the ratio of the new energy power generation power to the area load power does not meet the charging threshold condition, determine whether the ratio of the new energy power generation power to the area load power is less than the discharge threshold. If the ratio of the new energy power generation power to the area load power is less than the discharge threshold, proceed to step 7; Step 7: Determine whether the remaining energy storage charge capacity meets the energy storage discharge threshold condition. When the remaining energy storage charge capacity meets the discharge threshold condition, proceed to step 8; Step 8: Determine the load status of the area, and determine the energy storage discharge power value according to the load status of the area and the power generation power of new energy, and discharge at this power, and enter step 9; Step 9: Determine whether the energy storage device has reached the discharge cut-off condition. If so, enter the next cycle; if not, return to step 8.

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