An energy storage power station emergency frequency modulation control method and system

Abstract

The application discloses a kind of energy storage power station participates in power grid emergency frequency modulation control method and system, obtains power grid frequency and energy storage power station operating state, according to the real-time operating state of energy storage power station, the residual energy storage power station SOC numerical value is calculated, when power grid frequency is not in the first preset range, according to preset slope, adjust energy storage power station to preset rate charging power state or discharge power state, output adjusted power grid frequency and adjusted SOC numerical value;If adjusted power grid frequency is not in the second preset range, then according to the short-time K times overload capacity of energy storage battery and energy storage converter, switch charging state, and set charging stop time according to adjusted SOC numerical value, after delay T seconds, until energy storage power station returns to normal operating state.The automatic regulation of power grid frequency is realized by collecting local frequency, the frequency modulation pressure of conventional power supply is reduced, the amount of machine and load shedding caused by high frequency or low frequency problem of power grid after serious fault is reduced, and the safety boundary of power grid operation is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system power transmission, in particular to an emergency frequency modulation control method and system for energy storage power station. BACKGROUND

[0002] With the construction of new power systems, large-scale access of new energy represented by wind power and photovoltaic power to the power grid brings great difficulty to power grid peak regulation and frequency modulation due to the randomness and uncertainty of new energy output. After the proportion of traditional energy in the power grid decreases, the rotational inertia of the power grid also continuously decreases. During the period of large-scale new energy generation, once serious DC blocking or large power loss occurs, the frequency of the power grid will deviate seriously. Therefore, it is particularly important to provide new frequency modulation resources for the power grid. At present, for wind power and photovoltaic new energy, relevant guidelines require the configuration of a certain proportion of electrochemical energy storage. However, electrochemical energy storage is configured on the power supply side and is usually used only for the purpose of suppressing new energy fluctuations and smoothing power curves. Electrochemical energy storage has a fast frequency regulation function. If all electrochemical energy storage participates in the regulation of the power grid, it can provide a good means for emergency frequency modulation of the power grid. However, how electrochemical energy storage power stations effectively participate in primary frequency modulation and emergency frequency modulation of the power grid needs relevant control strategies as support. SUMMARY

[0003] The present application provides an emergency frequency modulation control method and system for energy storage power station, which realizes automatic regulation of power grid frequency by collecting local frequency, reduces the frequency modulation pressure of conventional power supply, reduces the amount of machine trip and load shedding caused by high frequency or low frequency problems of the power grid after serious faults, and improves the safety boundary of power grid operation.

[0004] To solve the above technical problems, the present application provides an emergency frequency modulation control method for energy storage power station, comprising:

[0005] Real-time acquisition of power grid frequency and energy storage power station operating state, calculation of residual energy storage power station SOC value according to real-time operating state of energy storage power station;

[0006] When the power grid frequency is not in the first preset range, and according to the SOC value and the operating state of the energy storage power station, the energy storage power station is adjusted to a preset multiple charging power state or a discharging power state according to a preset slope, and the adjusted power grid frequency and the adjusted SOC value are output;

[0007] If the adjusted power grid frequency is not in the second preset range, the charging state is switched according to the short-time K times overload capacity of the energy storage battery and the energy storage converter, and the charging stop time is set according to the adjusted SOC value. After a delay of T seconds, the energy storage power station is restored to a normal operating state.

[0008] In this embodiment, the grid frequency and the operating status of the energy storage station are acquired in real time, and the remaining power SOC value of the energy storage station is calculated based on the real-time operating status. When the grid frequency is not within a first preset range, the energy storage station is adjusted to a preset charging power state or discharging power state according to a preset slope based on the SOC value and the operating status of the energy storage station, and the adjusted grid frequency and the adjusted SOC value are output. If the adjusted grid frequency is not within a second preset range, the charging state is switched according to the short-term K times overload capacity of the energy storage battery and the energy storage converter, and the charging stop time is set according to the adjusted SOC value. After a delay of T seconds, the charging stops until the energy storage station returns to normal operation. By acquiring the local frequency, the grid frequency is automatically adjusted, which reduces the frequency regulation pressure of conventional power sources, reduces the amount of generator tripping and load shedding caused by high-frequency or low-frequency grid problems after a serious fault, and improves the safety boundary of grid operation.

[0009] As a preferred option, when the grid frequency is not within the first preset range, and based on the SOC value and the operating status of the energy storage station, the energy storage station is adjusted to a preset charging power state or discharging power state according to a preset slope, and the adjusted grid frequency and adjusted SOC value are output, specifically:

[0010] When the grid frequency is lower than the first preset value, if the energy storage station is in a discharging state, the energy storage station will be adjusted to a preset discharge power state according to the preset slope until the SOC value is equal to 0.1 and then the discharge will stop.

[0011] If the energy storage station is in charging or hot standby mode, adjust the energy storage station to the preset discharge power level according to the preset slope until the SOC value is equal to 0.1 and then stop discharging.

[0012] When the grid frequency exceeds the second preset value, if the energy storage station is in a charging state, the energy storage station will be adjusted to a preset charging power state according to the preset slope until the SOC value is equal to 1 and charging will stop.

[0013] If the energy storage station is in a discharging state or a hot standby state, the energy storage station will be adjusted to a preset charging power state according to a preset slope until the SOC equals 0.9 and then charging will stop.

[0014] As a preferred option, if the adjusted grid frequency is not within the second preset range, the charging state is switched according to the short-term K times overload capacity of the energy storage battery and energy storage converter, and the charging stop time is set according to the adjusted SOC value. After a delay of T seconds, the charging continues until the energy storage station returns to normal operation. Specifically:

[0015] When the adjusted grid frequency exceeds the third preset value, the charging power will be increased to K*Pe based on the short-term K times overload capacity of the energy storage battery and energy storage converter, until the SOC value is equal to 0.9 and charging will stop.

[0016] When the adjusted grid frequency is lower than the fourth preset value, the discharge power will be increased to K*Pe based on the short-time K times overload capacity of the energy storage battery and the energy storage converter, until the SOC value is equal to 0.1 and the discharge stops. Here, Pe is the rated power of the energy storage station and K represents the short-time overload capacity.

[0017] In this embodiment, when the current grid frequency exceeds a third preset value, the charging power is increased to K*Pe based on the short-term K-fold overload capacity of the energy storage battery and the energy storage converter, until charging stops when the SOC equals 0.9. If the current grid frequency is lower than a fourth preset value, the discharging power is increased to K*Pe based on the short-term K-fold overload capacity of the energy storage battery and the energy storage converter, until discharging stops when the SOC equals 0.1. By utilizing the fast frequency response characteristics of the energy storage power station to participate in regulation when the grid frequency changes, when the grid frequency is greater than f... c When the frequency shifts by Hz, utilizing the short-term overload capacity of energy storage power stations and energy storage converters to participate in frequency regulation at the stability control level is beneficial to system frequency stability and operational economy.

[0018] As the preferred option, the delay time of T seconds is determined based on the ability to exert K times the overload capacity in a short period of time.

[0019] As a preferred solution, to address the same technical problem, embodiments of the present invention also provide an emergency frequency regulation control system for an energy storage power station, including a frequency acquisition module, a first adjustment module, and a second adjustment module.

[0020] Among them, the frequency acquisition module is used to acquire the grid frequency and the operating status of the energy storage power station in real time, and calculate the remaining power SOC value of the energy storage power station based on the real-time operating status of the energy storage power station.

[0021] The first adjustment module is used to adjust the energy storage station to a preset charging power state or discharging power state according to a preset slope when the grid frequency is not within the first preset range, based on the SOC value and the operating status of the energy storage station, and output the adjusted grid frequency and the adjusted SOC value.

[0022] The second adjustment module is used to switch the charging state according to the short-term K times overload capacity of the energy storage battery and energy storage converter if the adjusted grid frequency is not within the second preset range, and to set the charging stop time according to the adjusted SOC value, and after a delay of T seconds, until the energy storage power station returns to normal operation.

[0023] As a preferred embodiment, the first adjustment module includes a first adjustment unit and a second adjustment unit.

[0024] The first adjustment unit is used to adjust the energy storage station to a preset discharge power state according to a preset slope when the grid frequency is lower than a first preset value, if the energy storage station is in a discharge state, until the SOC value is equal to 0.1 and then stop discharging; if the energy storage station is in a charging state or hot standby state, it is used to adjust the energy storage station to a preset charging power state according to a preset slope, until the SOC value is equal to 0.1 and then stop discharging.

[0025] The second adjustment unit is used to adjust the energy storage station to a preset charging power state according to a preset slope when the grid frequency exceeds a second preset value, if the energy storage station is in a charging state, until the SOC value is equal to 1 and charging stops; if the energy storage station is in a discharging state or hot standby state, it will adjust the energy storage station to a preset charging power state according to a preset slope until the SOC is equal to 0.9 and charging stops.

[0026] As a preferred embodiment, the second adjustment module includes a third adjustment unit and a fourth adjustment unit.

[0027] The third adjustment unit is used to increase the charging power to K*Pe based on the short-term K times overload capacity of the energy storage battery and the energy storage converter when the adjusted grid frequency exceeds the third preset value, until charging stops when the SOC equals 0.9.

[0028] The fourth adjustment unit is used to increase the discharge power to K*Pe based on the short-time K times overload capacity of the energy storage battery and energy storage converter when the adjusted grid frequency is lower than the fourth preset value, until the discharge stops when the SOC equals 0.1, where Pe is the rated power of the energy storage power station and K represents the short-time overload capacity.

[0029] As a preferred solution, in order to solve the same technical problem, embodiments of the present invention also provide an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the emergency frequency regulation control method for energy storage power stations as shown in the embodiments of the present invention.

[0030] As a preferred solution, in order to solve the same technical problem, embodiments of the present invention also provide a storage medium storing a computer program, which, when executed by a processor, implements the steps of the emergency frequency regulation control method for energy storage power stations as shown in embodiments of the present invention. Attached Figure Description

[0031] Figure 1 : A schematic flowchart of an embodiment of the emergency frequency regulation control method for energy storage power stations provided by the present invention;

[0032] Figure 2 : A schematic diagram of the frequency regulation process of an embodiment of the emergency frequency regulation control method for energy storage power stations provided by the present invention;

[0033] Figure 3 : A schematic diagram of the system structure of an embodiment of the emergency frequency regulation control method for energy storage power stations provided by the present invention; Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] Please refer to Figure 1 This invention provides an emergency frequency regulation control method for an energy storage power station, comprising steps 101 to 103, each step of which is detailed below:

[0037] Step 101: Obtain the grid frequency and the operating status of the energy storage power station in real time, and calculate the remaining power SOC value of the energy storage power station based on the real-time operating status of the energy storage power station.

[0038] In this embodiment, in a power grid with a high proportion of renewable energy sources and insufficient frequency regulation resources, the power grid adds a new frequency regulation receiving end, and the electrochemical energy storage power station only needs local frequency parameters to participate in active regulation. First, the power grid frequency is monitored in real time, and the adjustable power and the state of charge (SOC) of the energy storage power station are calculated based on the real-time operating status of the energy storage power station.

[0039] As an example of this embodiment, a certain power grid has a total power generation capacity of approximately 35 million kilowatts, of which approximately 15 million kilowatts are from renewable energy sources, and approximately 1.5 million kilowatts are from electrochemical energy storage. The energy storage is mainly installed on the renewable energy generation side. The maximum load is approximately 45 million kilowatts, with approximately 15 million kilowatts of power fed in through multiple DC lines. During periods of high renewable energy generation, renewable energy output is approximately 10 million kilowatts, conventional generating unit output is approximately 15 million kilowatts, with 15 million kilowatts of power fed in through multiple DC lines, resulting in a real-time load of approximately 40 million kilowatts. The electrochemical energy storage power station on the power supply side mainly participates in smoothing the renewable energy power fluctuation curve of the power grid.

[0040] Step 102: When the grid frequency is not within the first preset range, and based on the SOC value and the operating status of the energy storage station, adjust the energy storage station to a preset charging power state or discharging power state according to a preset slope, and output the adjusted grid frequency and the adjusted SOC value.

[0041] Optionally, when the grid frequency is lower than the first preset value, if the energy storage station is in a discharging state, the energy storage station is adjusted to a preset discharge power state according to a preset slope until the SOC value is equal to 0.1 and then the discharge stops.

[0042] If the energy storage station is in charging or hot standby mode, adjust the energy storage station to the preset charging power level according to the preset slope until the SOC value is equal to 0.1 and then stop discharging.

[0043] When the grid frequency exceeds the second preset value, if the energy storage station is in a charging state, the energy storage station will be adjusted to a preset charging power state according to the preset slope until the SOC value is equal to 1 and charging will stop.

[0044] If the energy storage station is in a discharging state or a hot standby state, the energy storage station will be adjusted to a preset charging power state according to a preset slope until the SOC equals 0.9 and then charging will stop.

[0045] In this embodiment, as Figure 2 As shown, when the frequency deviation exceeds ±0.05Hz, a frequency regulation is initiated, and the energy storage power station is adjusted to the maximum rate of charge and discharge power according to a certain slope.

[0046] When the grid frequency deviation exceeds the normal grid frequency by more than 0.05Hz, reaching 50.05Hz or higher, if the energy storage station is operating in charging mode, it will be adjusted to the maximum charging rate according to a preset slope until charging stops when the State of Charge (SOC) equals 1. If the energy storage station is operating in discharging or hot standby mode, its operating mode will be switched to the maximum charging rate until charging stops when the SOC equals 0.9. It should be noted that the slope can be manually set, and can be between 20 and 50.

[0047] When the frequency deviation exceeds -0.05Hz and reaches below 49.95Hz, if the energy storage station is operating in discharge mode, it will be adjusted to the maximum discharge rate mode according to a certain slope, with a discharge power of Pe, until the SOC equals 0.1 and then discharge stops. If the energy storage station is operating in charging mode or hot standby mode, the operating mode of the energy storage station will be switched to the maximum charging rate mode, with a charging power of Pe, until the SOC equals 0.1 and then discharge stops.

[0048] Step 103: If the adjusted grid frequency is not within the second preset range, the charging state is switched according to the short-term K times overload capacity of the energy storage battery and energy storage converter, and the charging stop time is set according to the adjusted SOC value. After a delay of T seconds, the charging station returns to normal operation.

[0049] Optionally, if the adjusted grid frequency is not within the second preset range, the charging state is switched according to the short-term K times overload capacity of the energy storage battery and energy storage converter, and the charging stop time is set according to the adjusted SOC value. After a delay of T seconds, the charging continues until the energy storage station returns to normal operation. Specifically:

[0050] When the adjusted grid frequency exceeds the third preset value, the charging power will be increased to K*Pe based on the short-term K times overload capacity of the energy storage battery and energy storage converter, until the SOC value is equal to 0.9 and charging will stop.

[0051] When the adjusted grid frequency is lower than the fourth preset value, the discharge power will be increased to K*Pe based on the short-time K times overload capacity of the energy storage battery and the energy storage converter, until the SOC value is equal to 0.1 and the discharge stops. Here, Pe is the rated power of the energy storage station and K represents the short-time overload capacity.

[0052] Optional, the delay time T seconds is obtained based on the ability to exert K times the overload capacity in a short time.

[0053] In this embodiment, when the frequency shifts further to the second threshold value, the short-time overload capability is activated for charging and discharging. When the frequency shifts upward beyond the stability control threshold, such as when the deviation exceeds 0.8Hz (i.e., the frequency reaches 50.8Hz or higher), the short-time K-fold overload capability of the energy storage battery and energy storage converter is utilized, and the discharge power is increased to K*Pe. Charging stops when the SOC equals 0.9.

[0054] When the frequency deviates downwards beyond the stability control threshold, such as a deviation exceeding 0.8Hz (i.e., the frequency falls below 49.2Hz), the short-term K-fold overload capacity of the energy storage battery and converter is activated, increasing the discharge power to K*Pe. Discharge stops when the SOC reaches 0.1, and after a delay of T seconds, the energy storage station returns to its pre-fault charging and discharging power state. Here, Pe is the rated power of the energy storage station, and K represents the short-term overload capacity. The overload coefficient will vary depending on the power output of the energy storage station, exhibiting an inverse-time overload curve. A larger overload factor K results in a shorter withstand time T. Therefore, for ease of control, a reasonable K-fold overload can be selected, corresponding to a withstand time T.

[0055] As an example of this embodiment, when monitoring the frequency of the energy storage power station's access point and the real-time operating status of the energy storage power station in real time, a DC bipolar blocking fault occurs at a certain moment, causing the grid frequency to drop and deviate significantly. When the frequency is below 49.95Hz, according to the control method for participating in emergency grid frequency regulation proposed in this application, each energy storage power station participates in frequency regulation based on its real-time operating status. If the energy storage power station is in a full-power discharge state at this time, it maintains this operating state; if the energy storage power station is in a hot standby or charging state, it quickly converts the energy storage to a full-power discharge state at a certain slope.

[0056] When the grid frequency drops further, and falls below 49.2Hz, energy storage systems with short-term overload capacity connected to the grid can further increase their discharge power according to their set short-term overload coefficient. For example, if a certain energy storage power station has a rated discharge power of 100MW, when the frequency is detected to be below 49.2Hz, its discharge power can quickly increase to 120MW due to its 1.2 times overload capacity. When all energy storage power stations with short-term overload capacity connected to the grid participate in emergency frequency regulation, the frequency drop can be further suppressed, reducing the amount of low-frequency load shedding in the grid. The table below shows the change in system frequency before and after an electrochemical energy storage power station in a receiving-end grid participates in emergency frequency regulation.

[0057] Table 1 Frequency Changes of Electrochemical Energy Storage Power Stations Participating in the Power Grid Emergency Frequency Regulation System

[0058] As can be seen from the table, during severe system failures, the participation of electrochemical energy storage power stations in emergency frequency regulation can suppress grid frequency fluctuations. By leveraging the emergency frequency regulation capabilities of energy storage power stations, post-fault grid frequency deviations can be suppressed, facilitating system frequency recovery, reducing the loss of generating units or loads after severe failures, improving grid operation safety, and simultaneously enhancing economic efficiency. It should be noted that the above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Therefore, equivalent variations made according to the claims of the present invention are still within the scope of the present invention.

[0059] The present invention has the following beneficial effects:

[0060] The remaining State of Charge (SOC) value is calculated based on the actual operating status of the energy storage power station. The frequency of the AC bus at the connection point is monitored in real time. When the frequency exceeds ±0.05Hz, the energy storage power station participates in regulation according to the slope of the local primary frequency regulation until the maximum charge / discharge power is reached. When the frequency reaches the stability control threshold, the energy storage battery and energy storage converter are charged and discharged according to their short-term K-fold overload capacity. After a time delay of T seconds, the energy storage power station returns to its pre-fault charge / discharge power state. This invention utilizes the fast frequency response characteristics of the energy storage power station to participate in regulation when the grid frequency changes by more than 0.05Hz. When the grid frequency deviates from a preset threshold, the short-term overload capacity of the energy storage power station and energy storage converter is used to participate in frequency regulation at the stability control level, which is beneficial to system frequency stability and operational economy, and improves the safety boundary of grid operation.

[0061] Example 2

[0062] Accordingly, see Figure 3 , Figure 3 This is a schematic diagram of an emergency frequency regulation control system for an energy storage power station provided by the present invention. As shown in the figure, the emergency frequency regulation control system for the energy storage power station includes a frequency acquisition module 301, a first adjustment module 302, and a second adjustment module 303. The specific units of each module are as follows:

[0063] The frequency acquisition module 301 is used to acquire the grid frequency and the operating status of the energy storage power station in real time, and calculate the remaining power SOC value of the energy storage power station based on the real-time operating status of the energy storage power station.

[0064] The first adjustment module 302 is used to adjust the energy storage station to a preset charging power state or discharging power state according to a preset slope when the grid frequency is not in the first preset range, based on the SOC value and the operating status of the energy storage station, and output the adjusted grid frequency and the adjusted SOC value.

[0065] The second adjustment module 303 is used to switch the charging state according to the short-term K times overload capacity of the energy storage battery and the energy storage converter if the adjusted grid frequency is not within the second preset range, and to set the charging stop time according to the adjusted SOC value, and after a delay of T seconds, until the energy storage power station returns to normal operation.

[0066] Optionally, the first adjustment module 302 includes a first adjustment unit 3021 and a second adjustment unit 3022.

[0067] The first adjustment unit 3021 is used to adjust the energy storage station to a preset discharge power state according to a preset slope until the SOC value is equal to 0.1 when the grid frequency is lower than the first preset value; if the energy storage station is in a discharge state, the first adjustment unit 3021 is used to adjust the energy storage station to a preset charging power state according to a preset slope until the SOC value is equal to 0.1 when the grid frequency is lower than the first preset value.

[0068] The second adjustment unit 3022 is used to adjust the energy storage station to a preset charging power state according to a preset slope when the grid frequency exceeds a second preset value, if the energy storage station is in a charging state, until the SOC value is equal to 1 and charging stops; if the energy storage station is in a discharging state or a hot standby state, the energy storage station is adjusted to a preset charging power state according to a preset slope until the SOC is equal to 0.9 and charging stops.

[0069] Optionally, the second adjustment module 303 includes a third adjustment unit 3031 and a fourth adjustment unit 3032.

[0070] The third adjustment unit 3031 is used to increase the charging power to K*Pe based on the short-term K times overload capacity of the energy storage battery and the energy storage converter when the adjusted grid frequency exceeds the third preset value, until the charging stops when the SOC equals 0.9.

[0071] The fourth adjustment unit 3032 is used to increase the discharge power to K*Pe based on the short-time K times overload capacity of the energy storage battery and the energy storage converter when the adjusted grid frequency is lower than the fourth preset value, until the discharge stops when the SOC is equal to 0.1, where Pe is the rated power of the energy storage station and K represents the short-time overload capacity.

[0072] Optionally, the present invention also provides an electronic device, a memory, and a processor for storing computer programs and implementing the emergency frequency regulation control method for energy storage power stations as described in Embodiment 1 when executing the computer programs.

[0073] Optionally, the present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of the emergency frequency regulation control method for an energy storage power station as described in Embodiment 1.

[0074] The aforementioned emergency frequency regulation control system for an energy storage power station can implement the emergency frequency regulation control method for an energy storage power station described in the above method embodiments. The options in the above method embodiments are also applicable to this embodiment, and will not be detailed here. The remaining contents of this application's embodiments can be referred to the contents of the above method embodiments, and will not be repeated in this embodiment.

[0075] For a more detailed explanation of the working principle and procedures of this embodiment, please refer to the relevant description in Embodiment 1.

[0076] Compared to existing technologies, this invention provides an emergency frequency regulation control method for energy storage power stations. By acquiring the grid frequency and the operating status of the energy storage power station in real time, the remaining State of Charge (SOC) value of the energy storage power station is calculated based on the real-time operating status. When the grid frequency is not within a first preset range, the energy storage power station is adjusted to a preset charging or discharging power state according to a preset slope based on the SOC value and the operating status of the energy storage power station. The adjusted grid frequency and the adjusted SOC value are output. If the adjusted grid frequency is not within a second preset range, the charging state is switched according to the short-term K-fold overload capacity of the energy storage battery and the energy storage converter. A charging stop time is set based on the adjusted SOC value, and after a delay of T seconds, the charging stops until the energy storage power station returns to normal operation. By acquiring the local frequency to achieve automatic grid frequency adjustment, the frequency regulation pressure on conventional power sources is reduced, and the amount of generator and load shedding caused by high-frequency or low-frequency grid problems after a serious fault is reduced, thus improving the safety boundary of grid operation.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. An emergency frequency regulation control method for an energy storage power station, characterized in that, include: The grid frequency and the operating status of the energy storage power station are acquired in real time, and the remaining power SOC value of the energy storage power station is calculated based on the real-time operating status of the energy storage power station. When the grid frequency is not within the first preset range, and according to the SOC value and the operating status of the energy storage station, the energy storage station is adjusted to a preset charging power state or discharging power state according to a preset slope, and the adjusted grid frequency and the adjusted SOC value are output. When the adjusted grid frequency exceeds the third preset value, the charging power is increased to K*Pe according to the short-term K times overload capacity of the energy storage battery and the energy storage converter, until the SOC value is equal to 0.9 and the charging stops. After a delay of T seconds, the energy storage power station returns to normal operation. When the adjusted grid frequency is lower than the fourth preset value, the discharge power is increased to K*Pe based on the short-time K times overload capacity of the energy storage battery and the energy storage converter. Discharge stops when the SOC value is equal to 0.

1. After a delay of T seconds, the energy storage power station returns to normal operation. Here, Pe is the rated power of the energy storage power station, and K represents the short-time overload capacity of the energy storage power station.

2. The emergency frequency regulation control method for an energy storage power station as described in claim 1, characterized in that, When the grid frequency is not within the first preset range, and based on the SOC value and the operating status of the energy storage station, the energy storage station is adjusted to a preset charging power state or discharging power state according to a preset slope, and the adjusted grid frequency and adjusted SOC value are output, specifically: When the grid frequency is lower than the first preset value, if the energy storage station is in a discharging state, the energy storage station is adjusted to a preset discharge power state according to a preset slope until the SOC value is equal to 0.1 and then the discharge stops. If the energy storage station is in charging or hot standby mode, adjust the energy storage station to the preset discharge power level according to the preset slope until the SOC value is equal to 0.1 and then stop discharging. When the grid frequency exceeds the second preset value, if the energy storage station is in a charging state, the energy storage station will be adjusted to a preset charging power state according to a preset slope until the SOC value is equal to 1 and charging will stop. If the energy storage station is in a discharging state or a hot standby state, the energy storage station will be adjusted to a preset charging power state according to a preset slope until the SOC equals 0.9 and then charging will stop.

3. The emergency frequency regulation control method for an energy storage power station as described in claim 1, characterized in that, The delay of T seconds is obtained based on the ability to exert K times the overload capacity in a short period of time.

4. An emergency frequency regulation control system for an energy storage power station, characterized in that, It includes a frequency acquisition module, a first adjustment module, and a second adjustment module. The frequency acquisition module is used to acquire the grid frequency and the operating status of the energy storage power station in real time, and calculate the remaining power SOC value of the energy storage power station based on the real-time operating status of the energy storage power station. The first adjustment module is used to adjust the energy storage station to a preset charging power state or discharging power state according to a preset slope when the grid frequency is not in the first preset range, based on the SOC value and the operating state of the energy storage station, and output the adjusted grid frequency and the adjusted SOC value. The second adjustment module is used to switch the charging state according to the short-term K times overload capacity of the energy storage battery and the energy storage converter if the adjusted grid frequency is not within the second preset range, and set the charging stop time according to the adjusted SOC value, and after a delay of T seconds, until the energy storage power station returns to normal operation. The second adjustment module includes a third adjustment unit and a fourth adjustment unit. The third adjustment unit is used to increase the charging power to K*Pe based on the short-term K times overload capacity of the energy storage battery and the energy storage converter when the adjusted grid frequency exceeds the third preset value, until charging stops when the SOC equals 0.

9. The fourth adjustment unit is used to increase the discharge power to K*Pe based on the short-time K times overload capacity of the energy storage battery and the energy storage converter when the adjusted grid frequency is lower than the fourth preset value, until the discharge stops when the SOC equals 0.1, where Pe is the rated power of the energy storage power station and K represents the short-time overload capacity.

5. The emergency frequency regulation control system for an energy storage power station as described in claim 4, characterized in that, The first adjustment module includes a first adjustment unit and a second adjustment unit. The first adjustment unit is used to adjust the energy storage station to a preset discharge power state according to a preset slope until the SOC value equals 0.1 when the grid frequency is lower than a first preset value; if the energy storage station is in a discharge state, the first adjustment unit is used to adjust the energy storage station to a preset charging power state according to a preset slope until the SOC value equals 0.1 when the grid frequency is lower than a first preset value; if the energy storage station is in a charging state or a hot standby state, the first adjustment unit is used to adjust the energy storage station to a preset charging power state according to a preset slope until the SOC value equals 0.1 when the first adjustment unit is used to adjust the energy storage station to a preset charging power state. The second adjustment unit is used to adjust the energy storage station to a preset charging power state according to a preset slope when the grid frequency exceeds a second preset value, if the energy storage station is in a charging state, until the SOC value is equal to 1 and charging stops; if the energy storage station is in a discharging state or a hot standby state, the unit adjusts the energy storage station to a preset charging power state according to a preset slope until the SOC is equal to 0.9 and charging stops.

6. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor is configured to implement the emergency frequency regulation control method for an energy storage power station as described in any one of claims 1 to 3 when executing the computer program.

7. A storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the steps of the emergency frequency regulation control method for an energy storage power station as described in any one of claims 1 to 3.

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