Energy storage power control method and system

Abstract

The invention discloses an energy storage power control method and system. The method comprises the steps that the charging and discharging state of an energy storage system is determined; determining the maximum charge-discharge power and the power critical value corresponding to the charge-discharge state; according to a preset rule, controlling the energy storage system to increase the charging and discharging power according to a first preset gradient until the maximum charging and discharging power is reached; wherein the preset rule comprises the following steps: monitoring a preset power parameter value of the grid-connected point in the process of increasing the charging and discharging power of the energy storage system according to a preset gradient; comparing a preset power parameter value with the power critical value; and controlling the energy storage system to lower the charging and discharging power according to a second preset gradient or continuously to increase the charging and discharging power according to the first preset gradient according to the comparison result, so that the preset power parameter value of the grid-connected point meets the power critical value. According to the energy storage power control scheme provided by the invention, the phenomena of overload and reverse power transmission of the transformer can be effectively avoided, and violent fluctuation of grid-connected point power can also be avoided.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to an energy storage power control method and system. Background Art

[0002] The rapid development of wind power and photovoltaic industries will promote the development of large-capacity energy storage industries. Energy storage technology has largely solved the randomness and volatility problems of renewable energy power generation, can achieve smooth output of renewable energy power generation, and can effectively regulate the changes in grid voltage, frequency and phase caused by renewable energy power generation, making it convenient and reliable for large-scale wind power and photovoltaic power generation to be integrated into conventional power grids.

[0003] User-side energy storage is usually built in factories or industrial parks that have been put into operation. Energy storage is not considered at the beginning of the transformer design, and it is difficult to expand the transformer capacity later. In this case, when the factory's electricity load is large, full-power charging of energy storage may cause transformer overload. In another scenario, in the application scenario of building rooftop photovoltaics in the factory area, when the photovoltaics are generating electricity at full power, the full-power discharge of energy storage is likely to cause reverse power transmission.

[0004] It can be seen that the existing energy storage deployment scheme is prone to transformer overload and reverse power transmission. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a method and system for controlling energy storage power, which can solve the problems of transformer overload and reverse power transmission that are prone to occur in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] An embodiment of the present invention provides a method for controlling energy storage power, the method comprising:

[0008] Determine the charge and discharge status of the energy storage system;

[0009] Determine the maximum charge and discharge power and power threshold corresponding to the charge and discharge state;

[0010] According to a preset rule, the energy storage system is controlled to increase the charge and discharge power according to a first preset gradient until the maximum charge and discharge power is reached;

[0011] The preset rules include:

[0012] In the process of increasing the charging and discharging power of the energy storage system according to the preset gradient, monitoring the preset power parameter value of the grid connection point;

[0013] Comparing the preset power parameter value with the power critical value;

[0014] According to the comparison result, the energy storage system is controlled to reduce the charging and discharging power according to the second preset gradient or continue to increase the charging and discharging power according to the first preset gradient, so that the preset power parameter value of the grid connection point meets the power critical value.

[0015] Optionally, the step of determining the charge and discharge state of the energy storage system includes:

[0016] According to the current time period, it is determined whether the energy storage system is in a charging mode or a discharging mode.

[0017] Optionally, when the energy storage system is in charging mode, the preset power parameter is the apparent power of the grid connection point; when the energy storage system is in discharging mode, the preset power parameter is the active power of the grid connection point.

[0018] Optionally, the step of controlling the energy storage system to reduce the charge and discharge power according to the second preset gradient or continue to increase the charge and discharge power according to the first preset gradient according to the comparison result, so that the preset power parameter value of the grid connection point meets the power critical value, includes:

[0019] When the energy storage system is in the discharge mode and the active power of the grid connection point is less than the power critical value, controlling the energy storage system to reduce the charging and discharging power according to a second preset gradient;

[0020] When the active power of the grid-connected point is greater than or equal to the power critical value, the energy storage system is controlled to continue to increase the charging and discharging power according to the first preset gradient.

[0021] Optionally, the step of controlling the energy storage system to reduce the charge and discharge power according to the second preset gradient or continue to increase the charge and discharge power according to the first preset gradient according to the comparison result, so that the preset power parameter value of the grid connection point meets the power critical value, includes:

[0022] When the energy storage system is in charging mode, when the apparent power at the grid connection point is greater than the power threshold, controlling the energy storage system to reduce the charging and discharging power according to a second preset gradient;

[0023] When the apparent power of the grid-connected point is less than or equal to the power critical value, the energy storage system is controlled to continue to increase the charging and discharging power according to the first preset gradient.

[0024] Optionally, the method further comprises:

[0025] The charge and discharge status, charge and discharge power, charge and discharge power adjustment strategy and preset power parameter value corresponding to the energy storage system at each moment are recorded.

[0026] Optionally, in the process of increasing the charging and discharging power of the energy storage system according to a preset gradient, the step of monitoring the preset power parameter value of the grid connection point includes:

[0027] In the process of increasing the charging and discharging power of the energy storage system according to a preset gradient, the power information of the grid connection point is monitored in real time through the power information collection device, wherein the power information of the grid connection point includes: active power, reactive power, apparent power and power factor.

[0028] An embodiment of the present invention provides an energy storage power control system, which includes: an electric power information collection device, a power control system, and an energy storage system;

[0029] The power information collection device is used to monitor the power information of the grid connection point in real time;

[0030] The power control system includes:

[0031] A communication unit, used to receive the grid connection point power information monitored in real time by the circuit information collection device;

[0032] A main control unit is used to determine the charge and discharge state of the energy storage system; determine the maximum charge and discharge power and the power threshold corresponding to the charge and discharge state; and control the energy storage system to increase the charge and discharge power according to a first preset gradient according to a preset rule until the maximum charge and discharge power is reached;

[0033] The preset rules include:

[0034] In the process of increasing the charging and discharging power of the energy storage system according to the preset gradient, monitoring the preset power parameter value of the grid connection point; wherein the grid connection point power information includes the preset power parameter value;

[0035] Comparing the preset power parameter value with the power critical value;

[0036] According to the comparison result, the energy storage system is controlled to reduce the charge and discharge power according to the second preset gradient or continue to increase the charge and discharge power according to the first preset gradient, so that the preset power parameter value of the grid connection point meets the power critical value;

[0037] The energy storage system is used to adjust the charging and discharging power according to the instructions of the power control system.

[0038] Optionally, the main control unit is further used for:

[0039] The charge and discharge status, charge and discharge power, charge and discharge power adjustment strategy and preset power parameter value corresponding to the energy storage system at each moment are recorded.

[0040] Optionally, when the energy storage system is in charging mode, the preset power parameter is the apparent power of the grid connection point; when the energy storage system is in discharging mode, the preset power parameter is the active power of the grid connection point.

[0041] The present invention discloses a power control scheme for energy storage, which determines the charge and discharge state of an energy storage system; determines the maximum charge and discharge power and the power critical value corresponding to the charge and discharge state; controls the energy storage system to increase the charge and discharge power according to a first preset gradient according to preset rules until the maximum charge and discharge power is reached; wherein the preset rules include: in the process of increasing the charge and discharge power of the energy storage system according to the preset gradient, monitoring the preset power parameter value of the grid connection point; comparing the preset power parameter value with the power critical value; and controlling the energy storage system to decrease the charge and discharge power according to a second preset gradient or continue to increase the charge and discharge power according to the first preset gradient according to the comparison result, so that the preset power parameter value of the grid connection point meets the power critical value. On the one hand, real-time adjustment of the energy storage power can effectively avoid transformer overload and reverse power transmission; on the other hand, the energy storage power is adjusted up or down in a step-by-step manner, which can avoid drastic fluctuations in the power of the grid connection point. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flowchart showing a method for controlling energy storage power according to an embodiment of the present application;

[0043] Figure 2 is a flowchart showing the steps of the energy storage power control method in the discharge mode of an embodiment of the present application;

[0044] Figure 3 is a flowchart showing the steps of the energy storage power control method in the charging mode of an embodiment of the present application;

[0045] Figure 4 is a structural block diagram of an energy storage power control system according to an embodiment of the present application;

[0046] Figure 5 It is a structural block diagram representing another energy storage power control system according to an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0048] The energy storage power control solution provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0049] As attached Figure 1 As shown, the energy storage power control method of the embodiment of the present application includes the following steps:

[0050] Step 101: Determine the charge and discharge status of the energy storage system.

[0051] The energy storage power control method provided in the embodiment of the present application is applied to a power control system and is used to dynamically control the charging and discharging power of the energy storage system.

[0052] When determining the charge and discharge state of the energy storage system, the energy storage system can be determined to be in charging mode or discharging mode according to the current time period. In other words, when the current time period is the discharging time period, the energy storage system enters the discharging mode, and when the current time period is the charging time period, the energy storage system enters the charging mode.

[0053] Step 102: Determine the maximum charge and discharge power and the power threshold corresponding to the charge and discharge state.

[0054] In the embodiment of the present application, the maximum charging and discharging power is set to keep the energy storage power within a reasonable range to avoid transformer overload and reverse power transmission.

[0055] The maximum charge and discharge power is a general term for the maximum charging power and the maximum discharging power. When the energy storage system is in a charging state, the maximum charging power is determined in this step. Correspondingly, when the energy storage system is in a discharging state, the maximum discharging power is determined in this step.

[0056] The specific values ​​of the maximum charging power and the maximum discharging power can be flexibly set by those skilled in the art according to the properties of the energy storage system itself, and no specific limitation is imposed on this in the embodiments of the present application.

[0057] Step 103: According to a preset rule, the energy storage system is controlled to increase the charge and discharge power according to a first preset gradient until the maximum charge and discharge power is reached.

[0058] Among them, the preset rules may include: in the process of increasing the charging and discharging power of the energy storage system according to the preset gradient, monitoring the preset power parameter value of the grid connection point; comparing the preset power parameter value with the power critical value; and controlling the energy storage system to decrease the charging and discharging power according to the second preset gradient or continue to increase the charging and discharging power according to the first preset gradient based on the comparison result, so that the preset power parameter value of the grid connection point meets the power critical value.

[0059] The energy storage system is currently in a different charging and discharging state, and the corresponding preset power parameters are different. When the energy storage system is in charging mode, the preset power parameter is the apparent power at the grid connection point; when the energy storage system is in discharging mode, the preset power parameter is the active power at the grid connection point.

[0060] In the embodiment of the present application, when the energy storage system is in the discharge mode, a power critical value is set to avoid the reverse power transmission phenomenon, ensuring that the active power of the grid connection point is less than the set power critical value during the step-by-step increase in the discharge power of the energy storage system. When the energy storage system is in the charging mode, a power critical value is set to avoid the transformer overload phenomenon, ensuring that the apparent power of the grid connection point is greater than the set power critical value during the step-by-step increase in the discharge power of the energy storage system.

[0061] Each time the charging and discharging power of the energy storage system is adjusted, the preset power parameter value of the grid connection point will be monitored and compared with the power critical value. If the power critical value limit condition is not met, the charging and discharging power of the energy storage system needs to be lowered. After the preset power parameter value of the grid connection point meets the power critical value limit condition, the charging and discharging power of the energy storage system is adjusted up. Repeat this process until the charging and discharging power of the energy storage system is adjusted to the maximum charging and discharging power.

[0062] A feasible method of controlling the energy storage system to reduce the charging and discharging power according to the second preset gradient or continue to increase the charging and discharging power according to the first preset gradient based on the comparison result so that the preset power parameter value of the grid connection point meets the power critical value may be as follows:

[0063] When the energy storage system is in discharge mode, when the active power of the grid-connected point is less than the power critical value, the energy storage system is controlled to reduce the charging and discharging power according to the second preset gradient; when the active power of the grid-connected point is greater than or equal to the power critical value, the energy storage system is controlled to continue to increase the charging and discharging power according to the first preset gradient.

[0064] When the energy storage system is in charging mode, when the apparent power at the grid connection point is greater than the power critical value, the energy storage system is controlled to reduce the charging and discharging power according to the second preset gradient; when the apparent power at the grid connection point is less than or equal to the power critical value, the energy storage system is controlled to continue to increase the charging and discharging power according to the first preset gradient.

[0065] It should be noted that the specific values ​​of the first preset gradient and the second preset gradient can be set by those skilled in the art according to actual needs, and are not specifically limited in the embodiments of the present application.

[0066] This optional step-by-step adjustment of the energy storage system power can avoid drastic fluctuations in the power at the grid connection point during the charging and discharging process of the energy storage system.

[0067] In an optional embodiment, in addition to adjusting the power of the energy storage system, the power control system can also record the charge and discharge state, charge and discharge power, charge and discharge power adjustment strategy and preset power parameter values ​​of the energy storage system at each moment.

[0068] The above-mentioned historical data can also be recorded to generate curves, reports, etc., so that relevant data analysis can be carried out later.

[0069] The energy storage power control method provided in the embodiment of the present application determines the charge and discharge state of the energy storage system; determines the maximum charge and discharge power and the power critical value corresponding to the charge and discharge state; controls the energy storage system to increase the charge and discharge power according to the first preset gradient according to the preset rules until the maximum charge and discharge power is reached; wherein the preset rules include: in the process of increasing the charge and discharge power of the energy storage system according to the preset gradient, monitoring the preset power parameter value of the grid connection point; comparing the preset power parameter value with the power critical value; based on the comparison result, controlling the energy storage system to reduce the charge and discharge power according to the second preset gradient or continue to increase the charge and discharge power according to the first preset gradient, so that the preset power parameter value of the grid connection point meets the power critical value. On the one hand, real-time adjustment of the energy storage power can effectively avoid transformer overload and reverse power transmission; on the other hand, the energy storage power is adjusted up or down in steps, which can avoid drastic fluctuations in the power of the grid connection point.

[0070] Combine the following Figure 2 The energy storage power control method provided in the embodiment of the present application is described with a specific example.

[0071] Figure 2 is a flowchart showing the steps of the energy storage power control method in the discharge mode of an embodiment of the present application, which specifically includes the following steps:

[0072] Step 201: Determine that the current period is a discharge period.

[0073] Step 202: When in the discharging period, the energy storage system enters the discharging mode.

[0074] Step 203: The energy storage system discharge power increases in steps.

[0075] In order to avoid drastic fluctuations in grid power caused by changes in energy storage power, the energy storage will gradually increase its power in steps to the set maximum discharge power.

[0076] Step 204: Monitor the active power of the grid connection point.

[0077] Step 205: Determine whether the active power of the grid connection point is less than the set threshold; if so, execute step 206; if not, execute step 207.

[0078] Step 206: The energy storage system discharge power decreases in steps.

[0079] Step 207: The discharge power of the energy storage system continues to increase in steps.

[0080] During the process of increasing the power of the energy storage system (i.e., increasing the discharge power of the energy storage system according to the first gradient value), the active power of the grid connection point will be monitored at the same time. If the power load of the plant decreases at this time, the active power of the grid connection point drops to the reverse power critical value, that is, the set threshold. In order to prevent the reverse power transmission phenomenon from occurring, the energy storage will gradually reduce (i.e., lower it according to the second gradient value) the discharge power of the energy storage system until the active power of the grid connection point is greater than the reverse power critical value. When the active power of the grid connection point is restored, the energy storage power will continue to increase gradually until the maximum discharge power. Among them, the reverse power critical value is equivalent to the power critical value described in the aforementioned embodiment.

[0081] The energy storage power control method under the discharge mode provided in this specific example, on the one hand, real-time adjustment of the energy storage power can effectively avoid the reverse power transmission phenomenon; on the other hand, the energy storage power is adjusted up or down in steps, which can avoid drastic fluctuations in the power at the grid connection point.

[0082] Combine the following Figure 3 The energy storage power control method provided in the embodiment of the present application is described with a specific example.

[0083] Figure 3 1 is a flowchart showing a method for controlling energy storage power in a charging mode according to an embodiment of the present application, which specifically includes the following steps:

[0084] Step 301: Determine that the current period is a charging period.

[0085] Step 302: When in the charging period, the energy storage system enters the charging mode.

[0086] Step 303: The charging power of the energy storage system is increased in steps.

[0087] In order to avoid drastic fluctuations in the power at the grid connection point caused by changes in the charging power of the energy storage system, the energy storage will gradually increase the charging power in steps to the set maximum charging power.

[0088] Step 304: Monitor the apparent power of the grid connection point.

[0089] Step 305: Determine whether the active power of the grid connection point is less than the set threshold; if so, execute step 306; if not, execute step 307.

[0090] Step 306: The charging power of the energy storage system decreases in steps.

[0091] Step 307: The charging power of the energy storage system continues to increase in steps.

[0092] During the process of increasing the power of the energy storage system (i.e., increasing the charging power of the energy storage system according to the first gradient value), the apparent power of the grid connection point will be monitored at the same time. If the power load of the plant increases at this time, the apparent power of the grid connection point rises to the critical value of the transformer overload, that is, the set threshold, and the transformer overload occurs. To avoid the occurrence of overload display, the energy storage system will gradually reduce the charging power until the apparent power of the grid connection point is less than the critical value of the transformer overload. When the apparent power of the grid connection point is restored, the charging power of the energy storage system will continue to increase gradually until it reaches the maximum charging power.

[0093] The transformer overload critical value is equivalent to the power critical value described in the above embodiment.

[0094] The energy storage power control method under the charging mode provided in this specific example, on the one hand, real-time adjustment of the energy storage power can effectively avoid transformer overload; on the other hand, the energy storage power is adjusted up or down in steps, which can avoid drastic fluctuations in the power at the grid connection point.

[0095] Figure 2 , Figure 3 The energy storage power control method shown in Figure 4 The energy storage power control system shown in is implemented. Figure 4 As shown, the energy storage power control system includes: a power information collection device, a power control system and an energy storage system;

[0096] The power control system includes a power controller with anti-backflow and anti-overload functions, a planning curve management module and a historical data record query module. The power controller is mainly used to control the charging and discharging power of the energy storage system.

[0097] The power information such as active power, reactive power, apparent power and the like of the grid connection point is collected through the power information collection device. The power information collection device is provided with a communication unit, which communicates with the communication unit in the power controller to send the power information to the power controller.

[0098] The power controller includes: two communication units and a main control unit. The main control unit determines the current energy storage output through the collected grid connection point power information and the planned curve, and sends the power control command to the energy storage system. The command is used to control the energy storage system to adjust the charging and discharging power. The command carries the adjustment amount and adjustment method (up or down). A communication unit in the power controller communicates with the communication unit of the power information collection device. Another communication unit in the power controller communicates with the communication unit in the energy storage system to send power control commands.

[0099] The main control unit of the power controller includes a planning curve management module and a data recording module.

[0100] The planning curve management module is used to manage the planning curve. The planning curve management module determines the current charging and discharging status and the maximum charging and discharging power in different time periods, and calculates the current optimal output in combination with the collected grid-connected point power information, and sends the power control command to the energy storage system so that the energy storage system can adjust the charging and discharging power according to the power control command.

[0101] The data recording module is used to generate and save historical data, and to generate curves and reports for data analysis.

[0102] Figure 5 A structural block diagram of an energy storage power control system for implementing an embodiment of the present application.

[0103] The energy storage power control system provided in the embodiment of the present application includes: a power information collection device 501, a power control system 502 and an energy storage system 503;

[0104] The power information collection device 501 is used to monitor the power information of the grid connection point in real time;

[0105] The power control system 502 includes:

[0106] The communication unit 5021 is used to receive the grid connection point power information monitored in real time by the circuit information collection device;

[0107] The main control unit 5022 is used to determine the charge and discharge state of the energy storage system; determine the maximum charge and discharge power and the power threshold corresponding to the charge and discharge state; and control the energy storage system to increase the charge and discharge power according to a first preset gradient according to a preset rule until the maximum charge and discharge power is reached;

[0108] The preset rules include:

[0109] In the process of increasing the charging and discharging power of the energy storage system according to the preset gradient, monitoring the preset power parameter value of the grid connection point; wherein the grid connection point power information includes the preset power parameter value;

[0110] Comparing the preset power parameter value with the power critical value;

[0111] According to the comparison result, the energy storage system is controlled to reduce the charge and discharge power according to the second preset gradient or continue to increase the charge and discharge power according to the first preset gradient, so that the preset power parameter value of the grid connection point meets the power critical value;

[0112] The energy storage system 503 is used to adjust the charging and discharging power according to the instructions of the power control system.

[0113] Optionally, the main control unit is further used for:

[0114] The charge and discharge status, charge and discharge power, charge and discharge power adjustment strategy and preset power parameter value corresponding to the energy storage system at each moment are recorded.

[0115] Optionally, when the main control unit determines the charging and discharging state of the energy storage system, it is specifically used to: determine whether the energy storage system is in a charging mode or a discharging mode according to a current time period.

[0116] Optionally, when the energy storage system is in charging mode, the preset power parameter is the apparent power of the grid connection point; when the energy storage system is in discharging mode, the preset power parameter is the active power of the grid connection point.

[0117] Optionally, the main control unit is specifically used to control the energy storage system to reduce the charging and discharging power according to a second preset gradient when the energy storage system is in a discharge mode and the active power of the grid connection point is less than the power critical value;

[0118] When the active power of the grid-connected point is greater than or equal to the power critical value, the energy storage system is controlled to continue to increase the charging and discharging power according to the first preset gradient.

[0119] Optionally, the main control unit is specifically configured to control the energy storage system to reduce the charging and discharging power according to a second preset gradient when the energy storage system is in a charging mode and the apparent power at the grid connection point is greater than the power critical value;

[0120] When the apparent power of the grid-connected point is less than or equal to the power critical value, the energy storage system is controlled to continue to increase the charging and discharging power according to the first preset gradient.

[0121] Optionally, the power control system further includes:

[0122] The data recording unit is used to record the charge and discharge state, charge and discharge power, charge and discharge power adjustment strategy and preset power parameter value corresponding to the energy storage system at each moment.

[0123] Optionally, the grid connection point power information includes: active power, reactive power, apparent power and power factor.

[0124] The embodiments of the present application provide Figure 5 The power control system in the energy storage power control system shown can achieve Figure 1 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0125] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0126] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling energy storage power, characterized in that: The method comprises: Determine the charge and discharge status of the energy storage system; Determine the maximum charge and discharge power and power threshold corresponding to the charge and discharge state; According to a preset rule, the energy storage system is controlled to increase the charge and discharge power according to a first preset gradient until the maximum charge and discharge power is reached; The preset rules include: In the process of increasing the charging and discharging power of the energy storage system according to the preset gradient, monitoring the preset power parameter value of the grid connection point; Comparing the preset power parameter value with the power critical value; According to the comparison result, the energy storage system is controlled to reduce the charging and discharging power according to the second preset gradient or continue to increase the charging and discharging power according to the first preset gradient, so that the preset power parameter value of the grid connection point meets the power critical value.

2. The method according to claim 1, characterized in that The steps of determining the charge and discharge status of the energy storage system include: According to the current time period, it is determined whether the energy storage system is in a charging mode or a discharging mode.

3. The method according to claim 1, characterized in that: When the energy storage system is in charging mode, the preset power parameter is the apparent power at the grid connection point; When the energy storage system is in a discharge mode, the preset power parameter is the active power of the grid connection point.

4. The method according to claim 3, characterized in that The step of controlling the energy storage system to reduce the charge and discharge power according to the second preset gradient or continue to increase the charge and discharge power according to the first preset gradient according to the comparison result, so that the preset power parameter value of the grid connection point meets the power critical value, includes: When the energy storage system is in the discharge mode and the active power of the grid connection point is less than the power critical value, controlling the energy storage system to reduce the charging and discharging power according to a second preset gradient; When the active power of the grid-connected point is greater than or equal to the power critical value, the energy storage system is controlled to continue to increase the charging and discharging power according to the first preset gradient.

5. The method according to claim 1, characterized in that The step of controlling the energy storage system to reduce the charge and discharge power according to the second preset gradient or continue to increase the charge and discharge power according to the first preset gradient according to the comparison result, so that the preset power parameter value of the grid connection point meets the power critical value, includes: When the energy storage system is in charging mode, when the apparent power at the grid connection point is greater than the power threshold, controlling the energy storage system to reduce the charging and discharging power according to a second preset gradient; When the apparent power of the grid-connected point is less than or equal to the power critical value, the energy storage system is controlled to continue to increase the charging and discharging power according to the first preset gradient.

6. The method according to claim 1, characterized in that The method further comprises: The charge and discharge status, charge and discharge power, charge and discharge power adjustment strategy and preset power parameter value corresponding to the energy storage system at each moment are recorded.

7. The method according to claim 1, characterized in that In the process of increasing the charging and discharging power of the energy storage system according to the preset gradient, the step of monitoring the preset power parameter value of the grid connection point includes: In the process of increasing the charging and discharging power of the energy storage system according to a preset gradient, the power information of the grid connection point is monitored in real time through the power information collection device, wherein the power information of the grid connection point includes: active power, reactive power, apparent power and power factor.

8. An energy storage power control system, characterized in that: The system comprises: a power information collection device, a power control system and an energy storage system; The power information collection device is used to monitor the power information of the grid connection point in real time; The power control system includes: A communication unit, used to receive the grid connection point power information monitored in real time by the circuit information collection device; A main control unit is used to determine the charge and discharge state of the energy storage system; determine the maximum charge and discharge power and the power threshold corresponding to the charge and discharge state; and control the energy storage system to increase the charge and discharge power according to a first preset gradient according to a preset rule until the maximum charge and discharge power is reached; The preset rules include: In the process of increasing the charging and discharging power of the energy storage system according to the preset gradient, monitoring the preset power parameter value of the grid connection point; wherein the grid connection point power information includes the preset power parameter value; Comparing the preset power parameter value with the power critical value; According to the comparison result, the energy storage system is controlled to reduce the charge and discharge power according to the second preset gradient or continue to increase the charge and discharge power according to the first preset gradient, so that the preset power parameter value of the grid connection point meets the power critical value; The energy storage system is used to adjust the charging and discharging power according to the instructions of the power control system.

9. The energy storage power control system according to claim 8, characterized in that: The main control unit is also used for: The charge and discharge status, charge and discharge power, charge and discharge power adjustment strategy and preset power parameter value corresponding to the energy storage system at each moment are recorded.

10. The energy storage power control system according to claim 8, characterized in that: When the energy storage system is in charging mode, the preset power parameter is the apparent power at the grid connection point; When the energy storage system is in a discharge mode, the preset power parameter is the active power of the grid connection point.

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