Frequency regulation methods, devices, controllers, and power systems of power systems

Abstract

This application discloses a frequency regulation method, apparatus, controller, and power system for a power system, belonging to the field of new energy power. The method includes: upon determining that a frequency regulation phase has begun, obtaining the total active power regulation based on frequency regulation parameters and a preset frequency and power droop control characteristic model; decomposing the total active power regulation according to the power regulation capability parameters of new energy devices, the power regulation capability parameters of energy storage units, and the power influence parameters of new energy devices, obtaining the active power regulation of each new energy device and each energy storage unit, wherein the power influence parameters are positively correlated with the active power regulation of the new energy devices; controlling each new energy device to operate according to its corresponding active power regulation, and controlling each energy storage unit to operate according to its corresponding active power regulation, thereby achieving frequency regulation. The embodiments of this application can improve the overall frequency regulation response capability of the power system.

Description

Technical Field

[0001] This application belongs to the field of new energy power, and in particular relates to a frequency regulation method, device, controller and power system for a power system. Background Technology

[0002] With the continuous development of new energy technologies, new energy power generation devices using new energy technologies are playing an increasingly important role in the power system. For example, multiple new energy devices can form a new energy power station. The new energy power station is connected to the grid through a grid connection point. When the frequency of the grid connection point becomes unstable, the new energy devices can provide power support to the grid. By adjusting the active power of the new energy devices, frequency regulation can be quickly performed to restore the frequency of the grid connection point to a stable state.

[0003] However, the current frequency regulation is insufficient to fully utilize the frequency regulation response capabilities of each new energy device, resulting in a slower frequency regulation response speed of new energy power plants and a reduction in the overall frequency regulation response capability. Summary of the Invention

[0004] This application provides a frequency regulation method, apparatus, controller, and power system for a power system, which can improve the overall frequency regulation response capability of the power system.

[0005] In a first aspect, embodiments of this application provide a frequency regulation method for a power system. The power system includes renewable energy devices and energy storage units. The energy storage units are connected to the renewable energy devices, and the renewable energy devices are connected to the power grid through a grid connection point. The method includes: when it is determined that the system has entered a frequency regulation phase, obtaining the total active power regulation amount based on frequency regulation parameters and a preset frequency and power droop control characteristic model; decomposing the total active power regulation amount according to the power regulation capability parameters of the renewable energy devices, the power regulation capability parameters of the energy storage units, and the power influence parameters of the renewable energy devices, obtaining the active power regulation amount of each renewable energy device and the active power regulation amount of each energy storage unit, wherein the power influence parameters are positively correlated with the active power regulation amount of the renewable energy devices; controlling each renewable energy device to operate according to the corresponding active power regulation amount, and controlling each energy storage unit to operate according to the corresponding active power regulation amount, so as to achieve frequency regulation.

[0006] In some possible embodiments, based on the power regulation capability parameters of the new energy device, the power regulation capability parameters of the energy storage unit, and the power impact parameters of the new energy device, the total active power regulation is decomposed to obtain the active power regulation of each new energy device and the active power regulation of each energy storage unit. This includes: decomposing the total active power regulation into new energy active power regulation and energy storage active power regulation based on the power regulation capability parameters of the new energy device and the energy storage unit; obtaining the weighting coefficients corresponding to the power impact parameters; decomposing the new energy active power regulation into the active power regulation of each new energy device based on the weighting coefficients of each new energy device, wherein the weighting coefficients are positively correlated with the power impact parameters; and decomposing the energy storage active power regulation into the active power regulation of each energy storage unit based on the power regulation capability parameters of each energy storage unit.

[0007] In some possible embodiments, obtaining the weighting coefficients corresponding to the power influence parameters includes: obtaining a preset weighting coefficient relationship, which includes the correspondence between the power influence parameter range and the weighting coefficients; obtaining the weighting coefficients corresponding to the power influence parameter range into which the power influence parameter falls in the weighting coefficient relationship, and using them as the weighting coefficients corresponding to the power influence parameters.

[0008] In some possible embodiments, the active power regulation of the new energy source is related to a first ratio, and the active power regulation of the energy storage source is related to a second ratio. The first ratio includes the ratio of the sum of the power regulation capability parameters of the new energy source devices to the first sum, and the second ratio includes the ratio of the sum of the power regulation capability parameters of the energy storage units to the first sum. The first sum is the sum of the power regulation capability parameters of the new energy source devices and the sum of the power regulation capability parameters of the energy storage units.

[0009] In some possible embodiments, the method further includes: determining to enter the frequency modulation stage when the actual frequency at the grid connection point is lower than the lower limit of the non-frequency modulation frequency range or higher than the upper limit of the non-frequency modulation frequency range, wherein the non-frequency modulation frequency range is obtained based on the rated frequency and the frequency dead zone; wherein, when the actual frequency at the grid connection point is lower than the lower limit of the non-frequency modulation frequency range, the power regulation capability parameter includes the power increase capability; and when the actual frequency at the grid connection point is higher than the upper limit of the non-frequency modulation frequency range, the power regulation capability parameter includes the power decrease capability.

[0010] In some possible embodiments, the method further includes: when it is determined that the frequency regulation phase is exiting, gradually reducing or increasing the total active power regulation over a preset exit period until the total active power regulation is zero.

[0011] In some possible embodiments, upon determining to exit the frequency regulation phase, the total active power regulation is gradually reduced or increased within a preset exit duration until the total active power regulation is zero. This includes: determining to exit the frequency regulation phase when the actual frequency of the grid connection point is within the non-frequency regulation frequency range; and within the preset exit duration, superimposing the portion of the total active power regulation in the target quadrant with the total active power regulation over time to obtain the reduced or increased total active power regulation, wherein the reduced or increased total active power regulation conforms to a sine wave.

[0012] In some possible embodiments, if the total active power regulation is greater than zero, the target quadrant is the third quadrant; if the total active power regulation is less than zero, the target quadrant is the first quadrant.

[0013] In some possible embodiments, the new energy device includes wind turbines and / or photovoltaic devices; power impact parameters include wind speed and / or solar irradiance.

[0014] Secondly, embodiments of this application provide a frequency regulation device for a power system. The power system includes new energy devices and energy storage units. The energy storage units are connected to the new energy devices, and the new energy devices are connected to the power grid through a grid connection point. The frequency regulation device includes: a regulation amount acquisition module, used to obtain the total active power regulation amount based on frequency regulation parameters and a preset frequency and power droop control characteristic model when it is determined that the frequency regulation phase has begun; a regulation amount allocation module, used to split the total active power regulation amount according to the power regulation capability parameters of the new energy devices, the power regulation capability parameters of the energy storage units, and the power influence parameters of the new energy devices, to obtain the active power regulation amount of each new energy device and the active power regulation amount of each energy storage unit, wherein the power influence parameters are positively correlated with the active power regulation amount of the new energy devices; and a control module, used to control each new energy device to operate according to the corresponding active power regulation amount, and to control each energy storage unit to operate according to the corresponding active power regulation amount, so as to achieve frequency regulation.

[0015] Thirdly, embodiments of this application provide a controller applied to a power system, the power system including a new energy device and an energy storage unit, the energy storage unit being connected to the new energy device, the new energy device being connected to the power grid through a grid connection point; the controller includes: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, it implements the frequency regulation method of the power system of the first aspect.

[0016] Fourthly, embodiments of this application provide a power system, including: a new energy device connected to the power grid via a grid connection point; an energy storage unit connected to the new energy device; and a controller for controlling the new energy device and the energy storage unit.

[0017] Fifthly, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the frequency regulation method for a power system according to the first aspect.

[0018] This application provides a frequency regulation method, device, controller, and power system for a power system. When entering the frequency regulation phase, based on frequency regulation parameters and a frequency and power droop control characteristic model, the total active power regulation of the power system is obtained. According to the power regulation capability parameters and power influence parameters of each renewable energy device, as well as the power regulation capability parameters of each energy storage unit, the total active power regulation is broken down into the active power regulation of each renewable energy device and the active power regulation of each energy storage unit. The power influence parameters are positively correlated with the active power regulation of the renewable energy devices, so that high-power renewable energy devices provide relatively more active power, and low-power renewable energy devices provide relatively less active power, fully utilizing the frequency regulation response capability of renewable energy devices, improving the frequency regulation response speed of the power system, and thus improving the overall frequency regulation response capability of the power system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a power system provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the structure of a power system provided in another embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a power system provided in yet another embodiment of this application;

[0023] Figure 4 A flowchart of a power system frequency regulation method provided in an embodiment of this application;

[0024] Figure 5 A line graph diagram illustrating an example of the frequency and power droop control characteristic model provided in an embodiment of this application;

[0025] Figure 6 A flowchart of a power system frequency regulation method provided in another embodiment of this application;

[0026] Figure 7 A schematic diagram illustrating an example of active power allocation provided in an embodiment of this application;

[0027] Figure 8 A flowchart of a power system frequency regulation method provided in another embodiment of this application;

[0028] Figure 9 A schematic diagram illustrating an example of the change in total active power regulation provided in an embodiment of this application;

[0029] Figure 10 A schematic diagram illustrating another example of the change in total active power regulation provided in the embodiments of this application;

[0030] Figure 11 A flowchart illustrating an example of a frequency regulation process for a power system provided in an embodiment of this application;

[0031] Figure 12 A schematic diagram of the structure of a frequency regulation device for a power system provided in an embodiment of this application;

[0032] Figure 13 This is a schematic diagram of the controller provided in one embodiment of this application. Detailed Implementation

[0033] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0034] With the continuous development of new energy technologies, new energy power generation devices using these technologies are accounting for an increasingly larger proportion of the power system and playing an increasingly important role. For example, multiple new energy devices can form a new energy power station. This station connects to the grid through a grid connection point. When the frequency at the grid connection point becomes unstable, the new energy devices can provide power support to the grid. By adjusting the active power of the new energy devices, frequency regulation can be quickly performed, restoring the frequency at the grid connection point to a stable state. However, different new energy devices offer varying frequency regulation capabilities, and current frequency regulation methods cannot fully utilize the individual frequency regulation capabilities of each device. This results in a slower frequency regulation response speed for new energy power stations, reducing the overall frequency regulation response capability. Furthermore, when the frequency at the grid connection point stabilizes and exits the frequency regulation process, frequency reversal can easily occur, resulting in a secondary frequency drop or increase, reducing the stability of the power system.

[0035] The frequency regulation method, device, controller, and power system provided in this application can obtain the total active power regulation of the power system after entering the frequency regulation phase. Based on the power impact parameters of new energy devices in the power system, the total active power regulation is allocated to each new energy device and energy storage unit in the power system. This allocation of the total active power regulation ensures that high-power new energy devices provide relatively more active power, while low-power new energy devices provide relatively less active power, fully utilizing the frequency regulation response capability of new energy devices and improving the frequency regulation response speed of the new energy power plants where these devices are located, thereby improving the overall frequency regulation response capability of the power system. Furthermore, when exiting the frequency regulation phase, the frequency regulation method, device, controller, and power system provided in this application will gradually adjust the total active power regulation, employing a flexible exit method to avoid frequency reversal and improve the stability of the power system.

[0036] To facilitate understanding, the structure of a power system will be explained first. A power system can include renewable energy devices and energy storage units. Renewable energy devices are connected to the grid through a grid connection point, providing electrical energy to the grid and also providing active power for frequency regulation when the frequency at the grid connection point becomes unstable. Renewable energy devices may include, but are not limited to, wind turbines and photovoltaic devices. Energy storage units are connected to renewable energy devices and can also provide active power for frequency regulation when the frequency at the grid connection point becomes unstable. Energy storage units may include, but are not limited to, batteries and flywheel devices.

[0037] Figure 1 This is a schematic diagram of the structure of a power system provided in an embodiment of this application, as shown below. Figure 1 As shown, the new energy device 11 is connected to the power grid 20 through the grid connection point A. The new energy device 11 may include a power generation structure 111 and a converter 112. The energy storage unit 12 may be connected to the DC bus 13 of the converter 112.

[0038] Figure 2 A schematic diagram of the power system provided in another embodiment of this application, such as... Figure 2 As shown, the new energy device 11 is connected to the power grid 20 through grid connection point A. The new energy device 11 may include a power generation structure 111 and a converter 112, and the energy storage unit 12 may be connected to the output terminal of the converter 112. Both of the above-mentioned connection methods between the new energy device 11 and the energy storage unit 12 can realize a power system integrating wind, solar and energy storage.

[0039] Figure 3 A schematic diagram of the structure of a power system provided in another embodiment of this application is shown below. Figure 3As shown, multiple new energy devices 11 can form a new energy power station 10. These devices 11 can be connected to grid connection point A via a collection line 14, and then connected to the power grid 20 via grid connection point A. An energy storage unit 12 is connected to the collection line 14. This connection method between the new energy devices 11 and the energy storage unit 12 enables a power system where the new energy power station 10 and the energy storage unit 12 are independent of each other.

[0040] It should be noted that other connection methods between the new energy device 11 and the energy storage unit 12 are also within the protection scope of this application embodiment.

[0041] The power system may also include a controller, which can execute the frequency regulation method of the power system in the embodiments of this application, control the new energy device 11 and the energy storage unit 12, and realize frequency regulation.

[0042] The power system may also include other devices, such as hydrogen production power sources, which serve as power sources. The control of these other devices can be carried out independently and is not limited here.

[0043] The frequency regulation method, device, controller, and power system provided in this application will be described below.

[0044] The first aspect of this application provides a frequency regulation method for a power system, which can be applied to the power system in the above embodiments. The frequency regulation method for the power system can be executed by a frequency regulation device, controller, etc. of the power system, and will not be described in detail here. Figure 4 A flowchart of a power system frequency regulation method provided in an embodiment of this application is shown below. Figure 4 As shown, the frequency regulation method of the power system may include steps S301 to S303.

[0045] In step S301, when it is determined that the frequency regulation stage has been entered, the total active power regulation is obtained based on the frequency regulation parameters and the preset frequency and power droop control characteristic model.

[0046] The actual frequency of the grid connection point can be obtained, and the decision to enter the frequency regulation phase can be determined based on this actual frequency. For example, it can be determined whether to enter the frequency regulation phase by checking if the actual frequency of the grid connection point is within the non-frequency regulation frequency range. If the actual frequency of the grid connection point is within the non-frequency regulation frequency range, it is determined that the frequency regulation phase is not required; if the actual frequency of the grid connection point exceeds the non-frequency regulation frequency range, it is determined that the frequency regulation phase will be entered, and the frequency regulation strategy will be executed. The actual frequency of the grid connection point exceeding the non-frequency regulation frequency range can include the actual frequency being less than the lower limit of the non-frequency regulation frequency range or the actual frequency being greater than the upper limit of the non-frequency regulation frequency range. The non-frequency regulation frequency range is determined based on the rated frequency and frequency dead zone of the grid connection point; the non-frequency regulation frequency range can be obtained by fluctuating the frequency dead zone with the rated frequency as the center. The frequency dead zone can be set according to the scenario, requirements, experience, etc., and is not limited here. For example, in primary frequency regulation, the frequency dead zone of a wind farm can be within the range of ±0.03Hz to ±0.1Hz, which can be set according to the grid requirements. Similarly, in primary frequency regulation, the frequency dead zone of a photovoltaic power station can be within the range of ±0.02Hz to ±0.06Hz, which can be set according to the grid requirements. In some examples, the actual frequency of the grid connection point can be compared with the lower and upper limits of the non-frequency regulation frequency range to determine whether the actual frequency of the grid connection point exceeds the non-frequency regulation frequency range, i.e., to determine whether to enter the frequency regulation phase. If the actual frequency of the grid connection point is lower than the lower limit or higher than the upper limit of the non-frequency regulation frequency range, it is determined that the frequency regulation phase has been entered. A frequency regulation flag can be configured to indicate whether the frequency regulation phase has been entered. If it is determined that the frequency regulation phase has been entered, the frequency regulation flag can be set to the first flag; if it is determined that the frequency regulation phase has not been entered or has been exited, the frequency regulation flag can be set to the second flag. The first and second flags are different.

[0047] Frequency regulation parameters may include frequency-related parameters required for frequency regulation. In some examples, frequency regulation parameters may include, but are not limited to, one or more of the following: frequency dead zone, actual frequency at the grid connection point, rated frequency at the grid connection point, rated power of the renewable energy plant where the renewable energy installation is located, active power frequency regulation coefficient of the renewable energy plant where the renewable energy installation is located, and initial value of active power of the renewable energy plant where the renewable energy installation is located. The initial value of active power of the renewable energy plant may be the actual active power at the moment of entering the frequency regulation phase. The frequency and power droop control characteristic model can characterize the relationship between the frequency of the power system's grid connection point and the active power that the renewable energy plant should adjust to. The frequency and power droop control characteristic model can be used for power droop control. The frequency and power droop control characteristic model can be obtained based on frequency regulation parameters and droop control principles. For example, Figure 5This is a line graph illustrating an example of the frequency and power droop control characteristic model provided in an embodiment of this application. The rated frequency can be 50Hz, the frequency dead zone can be ±0.1Hz (other values ​​are also possible and are not limited here), and the non-frequency modulation frequency range is [49.9Hz, 50.1Hz]. n The rated power of the new energy power station, such as Figure 5 As shown, frequencies outside the frequency range do not participate in frequency regulation. The power corresponding to frequencies outside the frequency range changes compared to the power corresponding to frequencies within the frequency range. During frequency regulation, it is desirable to obtain the total active power regulation amount according to the frequency and power droop control characteristic model, which can also be used to obtain the active power of the power system. The total active power regulation amount is the total amount of active power that the power system needs to regulate for frequency regulation. The frequency and power droop control characteristic model can be obtained from the following equations (1) and (2):

[0048] P Set =P0+ΔP (1)

[0049]

[0050] Among them, P Set P0 is the setpoint for the active power of the power system; P0 is the initial value of the active power before frequency regulation of the power system; ΔP is the total active power regulation; P t The rated power or real-time power of the power system can be configured on-site; Δf is the power system frequency deviation, specifically the difference between the actual frequency at the grid connection point and the upper limit of the non-frequency regulation frequency range when the actual frequency exceeds the non-frequency regulation frequency range, or the difference between the grid connection point and the lower limit of the non-frequency regulation frequency range; f n The rated frequency of the grid connection point; K f This is the active frequency regulation coefficient.

[0051] In step S302, based on the power regulation capability parameters of the new energy device, the power regulation capability parameters of the energy storage unit, and the power impact parameters of the new energy device, the total active power regulation is broken down to obtain the active power regulation of each new energy device and the active power regulation of each energy storage unit.

[0052] The power regulation capability parameters of a new energy device characterize the amount of active power that the device can regulate. In some examples, these parameters may include the device's achievable power increase and decrease. The achievable power increase can be obtained from the difference between the device's theoretical and actual active power, while the decrease can be obtained from the lower limit of its active power. Different new energy devices may have the same or different power regulation capability parameters. The power regulation capability parameters of an energy storage unit characterize the amount of active power that the unit can regulate. In some examples, these parameters may include the energy storage unit's achievable power increase and decrease. The energy storage unit's achievable power increase can be obtained from the upper limit of its State of Charge (SOC); the decrease can be obtained from the lower limit of its SOC. The power impact parameters of a new energy device may include parameters that affect its output, i.e., its active power. For example, new energy devices include wind turbines, and the power impact parameters of wind turbines may include wind speed; new energy devices include photovoltaic devices, and the power impact parameters of photovoltaic devices may include solar irradiance.

[0053] The total active power regulation can be broken down into multiple active power regulation amounts, which are allocated to each renewable energy device and each energy storage unit. The active power regulation amount for a renewable energy device is the additional active power regulation amount added to the device's existing active power. The active power regulation amount for an energy storage unit is the additional active power regulation amount added to the device's existing active power. The total active power regulation amount can be positive or negative, and the corresponding active power regulation amounts are also positive or negative. The power influence parameter of a renewable energy device is positively correlated with its active power regulation amount. The larger the power influence parameter of a renewable energy device, the higher its active power available for frequency regulation, and correspondingly, the larger its active power regulation amount. Conversely, the smaller the power influence parameter, the lower its active power available for frequency regulation, and correspondingly, the smaller its active power regulation amount. For example, for wind turbines, the higher the wind speed, the higher the active power of the turbine; therefore, a higher active power regulation should be allocated to wind turbines with higher wind speeds. Conversely, the lower the wind speed, the lower the active power of the turbine; therefore, a lower active power regulation should be allocated to wind turbines with lower wind speeds. Similarly, for photovoltaic (PV) systems, the higher the solar radiation intensity, the higher the active power of the PV system; therefore, a higher active power regulation should be allocated to PV systems with higher solar radiation intensity. Conversely, the lower the solar radiation intensity, the lower the active power of the PV system; therefore, a lower active power regulation should be allocated to wind turbines with lower solar radiation intensity.

[0054] In step S303, each new energy device is controlled to operate according to the corresponding active power adjustment amount, and each energy storage unit is controlled to operate according to the corresponding active power adjustment amount, so as to achieve frequency regulation.

[0055] Each renewable energy device is controlled to adjust its own active power according to its corresponding active power regulation amount, and operates at the adjusted active power. Similarly, each energy storage unit is controlled to adjust its own active power according to its corresponding active power regulation amount, and operates at the adjusted active power. By adjusting their active power according to the active power regulation amount, the renewable energy devices and energy storage units achieve frequency regulation, thereby pulling the frequency of the grid connection point back to the non-frequency regulation range, thus ensuring the stability of the grid connection point's frequency.

[0056] In this embodiment, upon entering the frequency regulation phase, based on the frequency regulation parameters and the frequency and power droop control characteristic model, the total active power regulation of the power system is obtained. According to the power regulation capability parameters and power impact parameters of each renewable energy device, as well as the power regulation capability parameters of each energy storage unit, the total active power regulation is broken down into the active power regulation of each renewable energy device and the active power regulation of each energy storage unit. The power impact parameters are positively correlated with the active power regulation of the renewable energy devices, so that high-power renewable energy devices provide relatively more active power, and low-power renewable energy devices provide relatively less active power, fully utilizing the frequency regulation response capability of renewable energy devices, improving the frequency regulation response speed of the power system, and thus improving the overall frequency regulation response capability of the power system.

[0057] In some embodiments, the total active power regulation can be first divided into the total regulation for all new energy devices, namely the new energy active power regulation, and the total regulation for all energy storage units, namely the energy storage active power regulation. Then, the new energy active power regulation and the energy storage active power regulation are further divided to obtain the active power regulation of each new energy device and the active power regulation of each energy storage unit.

[0058] Figure 6 A flowchart of a power system frequency regulation method provided in another embodiment of this application. Figure 6 and Figure 4 The difference is that, Figure 4 Step S302 can be further subdivided into steps S3021 to S3023.

[0059] In step S3021, based on the power regulation capability parameters of the new energy device and the power regulation capability parameters of the energy storage unit, the total active power regulation is divided into the active power regulation of new energy and the active power regulation of energy storage.

[0060] Based on the power regulation capability parameters of new energy devices and energy storage units, the total regulation value corresponding to the regulation capabilities of all new energy devices and the total regulation value corresponding to the regulation capabilities of all energy storage units can be determined. The active power regulation value of new energy devices can be considered the total regulation value corresponding to the regulation capabilities of all new energy devices. The active power regulation value of energy storage units can be considered the total regulation value corresponding to the regulation capabilities of all energy storage units.

[0061] In some examples, the active power regulation of new energy sources and the active power regulation of energy storage units can be obtained by separating them according to the proportion of the power regulation capability parameters of new energy devices and the power regulation capability parameters of energy storage units. The active power regulation of new energy sources is related to a first proportion, and the active power regulation of energy storage units is related to a second proportion. The first proportion includes the ratio of the sum of the power regulation capability parameters of new energy devices to a first sum, and the second proportion includes the ratio of the sum of the power regulation capability parameters of energy storage units to the first sum, where the first sum is the sum of the power regulation capability parameters of new energy devices and the sum of the power regulation capability parameters of energy storage units. The situation where the actual frequency of the grid connection point exceeds the non-frequency regulation frequency range can include two types: one is that the actual frequency is lower than the lower limit of the non-frequency regulation frequency range, and the other is that the actual frequency is higher than the upper limit of the non-frequency regulation frequency range. When the actual frequency of the grid connection point is lower than the lower limit of the non-frequency regulation frequency range, the power regulation capability parameter can include the power increase capability; when the actual frequency of the grid connection point is higher than the upper limit of the non-frequency regulation frequency range, the power regulation capability parameter can include the power decrease capability. For example, taking a power system as a wind-storage system, i.e., a power system including wind turbines and energy storage units, the active power regulation of new energy sources and the active power regulation of energy storage can be obtained according to the following formulas (3) to (8):

[0062]

[0063] Where, ΔP WF For the active power regulation of new energy sources; ΔP ESS Δf is the active power regulation of energy storage; ΔP is the total active power regulation; Δf = ff d Δf < 0 indicates that the actual frequency at the grid connection point is less than the lower limit of the non-frequency modulation frequency range, and Δf > 0 indicates that the actual frequency at the grid connection point is greater than the upper limit of the non-frequency modulation frequency range; P upWT (i) represents the power increase capability of the i-th renewable energy device; P upWF P represents the total power increase of n renewable energy devices; upES (i) represents the power increase capability of the i-th energy storage unit; P upESS P is the sum of the power that can be increased from m energy storage units; downWT (i) represents the scalable power of the i-th renewable energy device; P downWF P represents the total scalable power output of n renewable energy devices; downES(i) represents the scalable power of the i-th energy storage unit; P downESS It represents the sum of the degraded power of m energy storage units.

[0064] In step S3022, the weighting coefficients corresponding to the power impact parameters are obtained, and the active power adjustment amount of new energy is divided into the active power adjustment amount of each new energy device according to the weighting coefficient of each new energy device.

[0065] The weighting coefficient has a corresponding relationship with the power influence parameter. In this relationship, the weighting coefficient is positively correlated with the power influence parameter. The larger the power influence parameter, the larger the weighting coefficient; the smaller the power influence parameter, the smaller the weighting coefficient. For example, the power influence parameter of the new energy device includes wind speed, and a weighting coefficient that increases with increasing wind speed can be preset; the power influence parameter of the new energy device includes light intensity, and a weighting coefficient that increases with increasing light intensity can be preset. The weighting coefficient can be used to calculate the active power adjustment of each new energy device. The weighting coefficient is positively correlated with the active power adjustment of the new energy device. The larger the weighting coefficient, the larger the active power adjustment of the new energy device. For example, the active power adjustment of the new energy device can be obtained according to the following formula (9):

[0066]

[0067] Where, ΔP WT (i) represents the active power regulation of the i-th renewable energy device; ΔP WF For the active power regulation of new energy sources; W(v) i The power influence parameter is v. i The corresponding weighting coefficients; N(v) i The power influence parameter is v. i The number of new energy devices.

[0068] In some examples, weighting coefficient relationships can be preset, which include the correspondence between power influence parameter ranges and weighting coefficients. For example, if the power influence parameter includes wind speed, the weighting coefficient relationships can be shown in Table 1 below:

[0069] Table 1

[0070] Wind speed (m / s) Weighting coefficient v≤6 1 <![CDATA[6 ＜ v≤7]]> 2 <![CDATA[7 ＜ v≤8]]> 3 <![CDATA[8 ＜ v≤9]]> 4 <![CDATA[9 ＜ v≤10]]> 5 <![CDATA[10 ＜ v≤11]]> 9 <![CDATA[11 ＜ v≤12]]> 10 <![CDATA[12 ＜ v≤13]]> 11 <![CDATA[13 ＜ v≤14]]> 12 <![CDATA[v ＞ 14]]> 13

[0071] The weighting coefficient relationship can be obtained, and the weighting coefficient corresponding to the power influence parameter interval into which the power influence parameter falls can be obtained from the weighting coefficient relationship, and used as the weighting coefficient for the power influence parameter. For example, as shown in Table 1, if the wind speed of the wind turbine is 10 m / s, then the weighting coefficient corresponding to this wind speed is 5.

[0072] In step S3023, the active power regulation of energy storage is broken down into the active power regulation of each energy storage unit according to the power regulation capability parameter of each energy storage unit.

[0073] The active power regulation of each energy storage unit can be obtained by breaking down the active power regulation of the energy storage unit into its proportion relative to the sum of the power regulation parameters of all energy storage units. For example, the active power regulation of an energy storage unit can be obtained according to the following formula (10):

[0074]

[0075] Where, ΔP ES (i) represents the active power adjustment of the i-th energy storage unit; the definitions of other parameters can be found in the definitions in the above embodiments, and will not be repeated here.

[0076] Figure 7 A schematic diagram illustrating an example of active power allocation provided in an embodiment of this application, as shown below. Figure 7 As shown, the rated frequency f of the grid connection point can be set first. n The difference between the actual frequency f at the grid connection point and the actual frequency f is used for droop control to obtain the total active power regulation. The total active power regulation is first allocated to the active power regulation of renewable energy and the active power regulation of energy storage. The active power regulation of renewable energy can be allocated to the active power regulation of each renewable energy device required for single-unit frequency regulation. The active power regulation of energy storage can be allocated to the active power regulation of each energy storage unit required for unit frequency regulation. In some examples, the active power regulation of renewable energy devices and the active power regulation of energy storage devices can be limited (i.e.,...). Figure 7 (max and min in the text).

[0077] When the frequency at the grid connection point is disturbed, the total active power regulation will be suppressed. If the regulation in the active power is set to 0 directly after the frequency at the grid connection point returns to normal, it is highly likely to cause a secondary fluctuation in the frequency at the grid connection point. The embodiments of this application will adopt a flexible exit method to exit the frequency regulation stage. Figure 8 A flowchart of a power system frequency regulation method provided in another embodiment of this application. Figure 8 and Figure 4 The difference is that, Figure 8 The frequency regulation method for the power system shown may also include step S304.

[0078] In step S304, if it is determined that the frequency regulation phase is to be exited, the total active power regulation is gradually reduced or increased within a preset exit time until the total active power regulation is zero.

[0079] Whether to exit the frequency modulation phase can be determined based on whether the actual frequency of the grid connection point is within the non-frequency modulation frequency range. If the actual frequency of the grid connection point is within the non-frequency modulation frequency range, it is determined that the frequency of the grid connection point has returned to normal, thus determining that the frequency modulation phase has been exited.

[0080] The preset exit duration can be set according to the scenario, requirements, experience, etc., and is not limited here. If the total active power regulation is greater than zero during the frequency regulation phase, the total active power regulation will be gradually reduced within the preset exit duration until it reaches zero. If the total active power regulation is less than zero during the frequency regulation phase, the total active power regulation will be gradually increased within the preset exit duration until it reaches zero. In some examples, within the preset exit duration, the portion of the total active power regulation in the target quadrant is superimposed on the total active power regulation over time to obtain the reduced or increased total active power regulation, which conforms to a sinusoidal waveform. If the total active power regulation is greater than zero, the target quadrant is the third quadrant, and the portion of the total active power regulation in the third quadrant is negative. The portion of the total active power regulation in the third quadrant is superimposed on the total active power regulation to obtain a reduced total active power regulation. This reduction is achieved by gradually decreasing the total active power regulation over time using the same method of superimposing the portion of the regulation in the third quadrant. The waveform of the reduced total active power regulation over time within the preset withdrawal period conforms to a sine wave. Similarly, if the total active power regulation is less than zero, the target quadrant is the first quadrant, and the portion of the total active power regulation in the first quadrant is positive. The portion of the total active power regulation in the first quadrant is superimposed on the total active power regulation to obtain an increased total active power regulation. This increase is achieved by gradually decreasing the total active power regulation over time using the same method of superimposing the portion of the regulation in the first quadrant. The waveform of the increased total active power regulation over time within the preset withdrawal period conforms to a sine wave. Within the preset exit time, based on the power regulation capability parameters of the new energy devices, the power regulation capability parameters of the energy storage units, and the power impact parameters of the new energy devices, the total active power regulation amount after reduction or increase will be broken down, the active power regulation amount of each new energy device and the active power regulation amount of each energy storage unit will be obtained, and each new energy device will be controlled to operate according to the corresponding active power regulation amount, and each energy storage unit will be controlled to operate according to the corresponding active power regulation amount, so as to achieve flexible exit of frequency regulation.

[0081] For example, the adjustment of the total active power regulation can be obtained according to the following equations (11) and (12), where equation (11) holds when the total active power regulation is greater than 0, and equation (12) holds when the total active power regulation is less than 0:

[0082]

[0083] Where ΔP′ is the total active power adjustment after reduction or increase; ΔP is the total active power adjustment before reduction or increase; t is the current time; T0 is the time to determine exit from the frequency regulation phase; and T is the preset exit duration.

[0084] Figure 9 This is a schematic diagram illustrating an example of the change in the total active power regulation provided in an embodiment of this application. Figure 10 This is a schematic diagram illustrating another example of the change in the total active power regulation provided in the embodiments of this application. Figure 9 and Figure 10 The horizontal axis represents time, and the vertical axis represents the total adjustment of active power. Figure 9 The diagram illustrates the change in total active power regulation when it is greater than zero. If a direct withdrawal method is used, the total active power regulation will be directly adjusted to zero at time T0, which could potentially cause secondary disturbances to the grid connection frequency. If the flexible withdrawal method described in this embodiment is used, starting from time T0, the portion of the total active power regulation in the third quadrant is superimposed with the total active power regulation over time to obtain the reduced total active power regulation within a preset withdrawal period from time T0 to time T0+T. Figure 9 As shown, the reduced total active power regulation within the preset exit time from time T0 to time T0+T conforms to a sine wave. This flexible exit method of gradually reducing the total active power regulation can avoid secondary fluctuations in the frequency at the grid connection point, thus ensuring the stability of the power system. Figure 10 The diagram illustrates the change in total active power regulation when it is less than zero. If a direct withdrawal method is used, the total active power regulation will be adjusted to zero directly at time T0, which could potentially cause secondary fluctuations in the grid connection frequency. If the flexible withdrawal method described in this embodiment is used, starting from time T0, the portion of the total active power regulation in the first quadrant is superimposed with the total active power regulation over time, resulting in the increased total active power regulation over the preset withdrawal period from time T0 to time T0+T. Figure 10 As shown, the total active power regulation after the increase within the preset exit time from time T0 to time T0+T conforms to a sine wave. This flexible exit method of gradually increasing the total active power regulation can avoid secondary fluctuations in the frequency at the grid connection point, thereby ensuring the stability of the power system.

[0085] For ease of understanding, the frequency regulation process of the power system in the embodiments of this application is described below. Figure 11 A flowchart illustrating an example of a frequency regulation process for a power system provided in an embodiment of this application is shown below. Figure 11 As shown, the frequency regulation process of the power system may include steps a1 to a10.

[0086] In step a1, the actual frequency of the grid connection point is obtained.

[0087] In step a2, it is determined whether the actual frequency exceeds the non-FM frequency range. If it exceeds the non-FM frequency range, it indicates that the frequency modulation phase has begun, and step a3 is executed; if it does not exceed the non-FM frequency range, it indicates that the frequency modulation phase has not begun and normal operation has commenced, or the frequency modulation phase has been exited, and step a9 is executed. It should be noted that when the actual frequency exceeds the non-FM frequency range, the frequency modulation flag can be set to the first flag; when the actual frequency does not exceed the non-FM frequency range, the frequency modulation flag can be set to the second flag.

[0088] In step a3, the total active power adjustment is calculated through droop control. Specifically, it can be calculated using frequency regulation parameters and a preset frequency and power droop control characteristic model.

[0089] In step a4, the total active power adjustment amount is allocated to obtain the active power adjustment amount of new energy and the active power adjustment amount of energy storage.

[0090] In step a5, the active power adjustment amount of new energy is allocated to obtain the active power adjustment amount of each new energy device.

[0091] In step a6, the active power adjustment amount of energy storage is allocated to obtain the active power adjustment amount of each energy storage unit.

[0092] In step a7, the new energy device is controlled to perform the corresponding active power adjustment, and then the process returns to step a2.

[0093] In step a8, the energy storage unit is controlled to perform the corresponding active power adjustment, and then the process returns to step a2.

[0094] In step a9, it is determined whether the frequency modulation flag bit of the previous moment is the same as the frequency modulation flag bit of the current moment. If they are the same, the process ends; if they are not the same, step a10 is executed.

[0095] In step a10, a flexible exit strategy is executed. The flexible exit strategy can be found in the relevant descriptions of flexible exit in the above embodiments, and will not be repeated here.

[0096] The specific details of steps a1 to a10 above can be found in the relevant descriptions in the above embodiments, and will not be repeated here.

[0097] The second aspect of this application provides a frequency regulation device for a power system. The specific details of the power system can be found in the relevant content of the above embodiments, and will not be repeated here. Figure 12 A schematic diagram of the structure of a frequency regulation device for a power system provided in an embodiment of this application is shown below. Figure 12As shown, the frequency regulation device 400 of the power system may include a regulation amount acquisition module 401, a regulation amount allocation module 402, and a control module 403.

[0098] The adjustment quantity acquisition module 401 can be used to obtain the total active power adjustment quantity based on the frequency regulation parameters and the preset frequency and power droop control characteristic model when it is determined that the frequency regulation stage has been entered.

[0099] The regulation allocation module 402 can be used to split the total active power regulation amount according to the power regulation capability parameters of the new energy device, the power regulation capability parameters of the energy storage unit, and the power impact parameters of the new energy device, and obtain the active power regulation amount of each new energy device and the active power regulation amount of each energy storage unit.

[0100] Among them, the power impact parameter is positively correlated with the active power adjustment of the new energy device.

[0101] The control module 403 can be used to control each new energy device to operate according to the corresponding active power adjustment amount, and to control each energy storage unit to operate according to the corresponding active power adjustment amount, so as to achieve frequency regulation.

[0102] In some embodiments, the regulation allocation module 402 may be specifically used to: divide the total active power regulation into active power regulation of new energy and active power regulation of energy storage according to the power regulation capability parameters of the new energy device and the power regulation capability parameters of the energy storage unit; obtain the weight coefficients corresponding to the power influence parameters; divide the active power regulation of new energy into active power regulation of each new energy device according to the weight coefficients of each new energy device, wherein the weight coefficients are positively correlated with the power influence parameters; and divide the active power regulation of energy storage into active power regulation of each energy storage unit according to the power regulation capability parameters of each energy storage unit.

[0103] In some examples, the adjustment allocation module 402 may be specifically used to: obtain a preset weight coefficient relationship, which includes the correspondence between the power influence parameter range and the weight coefficient; obtain the weight coefficient corresponding to the power influence parameter range into which the power influence parameter falls in the weight coefficient relationship, and use it as the weight coefficient corresponding to the power influence parameter.

[0104] In some examples, the active power regulation of new energy sources is related to a first ratio, while the active power regulation of energy storage is related to a second ratio. The first ratio includes the proportion of the sum of the power regulation capability parameters of new energy devices to a first sum. The second ratio includes the proportion of the sum of the power regulation capability parameters of energy storage units to the first sum. The first sum is the sum of the power regulation capability parameters of new energy devices and the sum of the power regulation capability parameters of energy storage units.

[0105] In some embodiments, the frequency regulation device 400 of the power system may further include a dead-zone determination module. The dead-zone determination module can be used to determine whether to enter the frequency regulation phase when the actual frequency at the grid connection point is lower than the lower limit of the non-frequency regulation frequency range or higher than the upper limit of the non-frequency regulation frequency range. The non-frequency regulation frequency range is obtained based on the rated frequency and the frequency dead zone. Wherein, when the actual frequency at the grid connection point is lower than the lower limit of the non-frequency regulation frequency range, the power regulation capability parameter includes the power increase capability; when the actual frequency at the grid connection point is higher than the upper limit of the non-frequency regulation frequency range, the power regulation capability parameter includes the power decrease capability.

[0106] In some embodiments, the frequency regulation device 400 of the power system may further include a flexible exit execution module. The flexible exit execution module can be used to: when it is determined that the frequency regulation phase is to be exited, gradually reduce or increase the total active power regulation amount within a preset exit time period until the total active power regulation amount is zero.

[0107] In some examples, the flexible exit execution module can be specifically used to: determine the exit from the frequency regulation stage when the actual frequency of the grid connection point is in the non-frequency regulation frequency range; and within the preset exit duration, superimpose the portion of the total active power regulation in the target quadrant with the total active power regulation over time to obtain the reduced or increased total active power regulation, which conforms to a sine wave.

[0108] In some examples, if the total active power regulation is greater than zero, the target quadrant is the third quadrant. If the total active power regulation is less than zero, the target quadrant is the first quadrant.

[0109] In some embodiments, the new energy installations include wind turbines and / or photovoltaic devices. Power impact parameters include wind speed and / or solar irradiance.

[0110] It should be noted that the frequency regulation device 400 of the power system is a device corresponding to the frequency regulation method of the power system described above. All implementation methods in the above method embodiments are applicable to the embodiments of this device and can achieve the same technical effect.

[0111] A third aspect of this application also provides a controller that can be applied to the power system described in the above embodiments. Figure 13 This is a schematic diagram of the controller provided in one embodiment of this application, as shown below. Figure 13 As shown, the controller 500 includes a memory 501, a processor 502, and a computer program stored in the memory 501 and executable on the processor 502.

[0112] In some examples, the processor 502 described above may include a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits that may be configured to implement the embodiments of this application.

[0113] Memory 501 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Therefore, typically, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the frequency regulation method of the power system according to embodiments of this application.

[0114] The processor 502 runs a computer program corresponding to the executable program code by reading the executable program code stored in the memory 501, so as to implement the frequency regulation method of the power system in the above embodiment.

[0115] In some examples, the controller 500 may also include a communication interface 503 and a bus 504. For example, Figure 13 As shown, the memory 501, processor 502, and communication interface 503 are connected through bus 504 and complete communication with each other.

[0116] The communication interface 503 is mainly used to enable communication between various modules, devices, units, and / or equipment in the embodiments of this application. Input devices and / or output devices can also be connected through the communication interface 503.

[0117] Bus 504 includes hardware, software, or both, that couples the components of controller 500 together. For example, and not limitingly, bus 504 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-E) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 504 may include one or more buses. Although specific buses are described and illustrated in the embodiments of this application, this application considers any suitable bus or interconnection.

[0118] This application provides a fourth aspect of a power system. The power system includes a new energy device, an energy storage unit, and a controller as described in the above embodiments. The new energy device is connected to the power grid through a grid connection point. The energy storage unit is connected to the new energy device. The controller can be used to execute the frequency regulation method of the power system in the above embodiments, controlling the new energy device and the energy storage unit. For details, please refer to the relevant descriptions in the above embodiments, which achieve the same technical effects; to avoid repetition, they will not be repeated here.

[0119] A fifth aspect of this application provides a computer-readable storage medium storing computer program instructions. When executed by a processor, these instructions can implement the frequency regulation method of the power system described in the above embodiments and achieve the same technical effect. To avoid repetition, further details are omitted here. The aforementioned computer-readable storage medium may include non-transitory computer-readable storage media, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks, etc., and is not limited thereto.

[0120] This application provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the frequency regulation method of the power system in the above embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0121] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. For the device embodiments, controller embodiments, power system embodiments, and computer-readable storage medium embodiments, the relevant parts can be referred to the description section of the method embodiments. This application is not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0122] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0123] Those skilled in the art will understand that the above embodiments are exemplary and not restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specification, and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other means or steps; the quantifier "a" does not exclude a plurality; the terms "first" and "second" are used to identify names and not to indicate any particular order. No reference numerals in the claims should be construed as limiting the scope of protection. The functionality of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A frequency regulation method for a power system, characterized in that, The power system includes a new energy device and an energy storage unit, the energy storage unit being connected to the new energy device, and the new energy device being connected to the power grid through a grid connection point. The method includes: Once the frequency regulation phase is determined, the total active power regulation is obtained based on the frequency regulation parameters and the preset frequency and power droop control characteristic model. Based on the power regulation capability parameters of the new energy device, the power regulation capability parameters of the energy storage unit, and the power influence parameters of the new energy device, the total active power regulation is broken down to obtain the active power regulation of each new energy device and the active power regulation of each energy storage unit. The power influence parameters are positively correlated with the active power regulation of the new energy device, and the power influence parameters have a corresponding relationship with the weighting coefficient. The weighting coefficient is positively correlated with the power influence parameters and is used to calculate the active power regulation of each new energy device. Control each of the new energy devices to operate according to the corresponding active power adjustment amount, and control each of the energy storage units to operate according to the corresponding active power adjustment amount, so as to achieve frequency regulation; If the actual frequency at the grid connection point is within the non-frequency modulation frequency range, it is determined to exit the frequency modulation phase; Within a preset exit time, the portion of the total active power adjustment in the target quadrant is superimposed on the total active power adjustment over time to obtain the reduced or increased total active power adjustment. The reduced or increased total active power adjustment conforms to a sine wave.

2. The method according to claim 1, characterized in that, The step of breaking down the total active power regulation based on the power regulation capability parameters of the new energy device, the power regulation capability parameters of the energy storage unit, and the power impact parameters of the new energy device to obtain the active power regulation of each new energy device and the active power regulation of each energy storage unit includes: Based on the power regulation capability parameters of the new energy device and the power regulation capability parameters of the energy storage unit, the total active power regulation is divided into the active power regulation of new energy and the active power regulation of energy storage. Obtain the weighting coefficient corresponding to the power impact parameter, and according to the weighting coefficient of each new energy device, decompose the new energy active power adjustment amount into the active power adjustment amount of each new energy device. The weighting coefficient is positively correlated with the power impact parameter. Based on the power regulation capability parameters of each energy storage unit, the active power regulation of energy storage is broken down into the active power regulation of each energy storage unit.

3. The method according to claim 2, characterized in that, The step of obtaining the weighting coefficients corresponding to the power influence parameters includes: Obtain a preset weighting coefficient relationship, wherein the weighting coefficient relationship includes the correspondence between the power influence parameter range and the weighting coefficient; The weight coefficient corresponding to the power influence parameter interval into which the power influence parameter falls is obtained from the weight coefficient relationship, and is used as the weight coefficient corresponding to the power influence parameter.

4. The method according to claim 2, characterized in that, The active power regulation of the new energy source is related to a first ratio, and the active power regulation of the energy storage source is related to a second ratio. The first ratio includes the proportion of the sum of the power regulation capability parameters of the new energy device to the first sum, and the second ratio includes the proportion of the sum of the power regulation capability parameters of the energy storage unit to the first sum. The first sum is the sum of the sum of the power regulation capability parameters of the new energy device and the sum of the power regulation capability parameters of the energy storage unit.

5. The method according to claim 1, characterized in that, Also includes: If the actual frequency at the grid connection point is lower than the lower limit of the non-frequency modulation frequency range or higher than the upper limit of the non-frequency modulation frequency range, it is determined that the frequency modulation stage is entered. The non-frequency modulation frequency range is obtained based on the rated frequency and the frequency dead zone. Wherein, when the actual frequency at the grid connection point is lower than the lower limit of the non-frequency modulation frequency range, the power regulation capability parameter includes the ability to increase power; when the actual frequency at the grid connection point is higher than the upper limit of the non-frequency modulation frequency range, the power regulation capability parameter includes the ability to decrease power.

6. The method according to claim 1, characterized in that, If the total active power adjustment is greater than zero, the target quadrant is the third quadrant; If the total active power adjustment is less than zero, the target quadrant is the first quadrant.

7. The method according to any one of claims 1 to 6, characterized in that, The new energy devices include wind turbines and / or photovoltaic devices; The power-affecting parameters include wind speed and / or light intensity.

8. A frequency regulation device for a power system, characterized in that, The power system includes a new energy device and an energy storage unit. The energy storage unit is connected to the new energy device, and the new energy device is connected to the power grid through a grid connection point. The frequency regulation device includes: The regulation acquisition module is used to obtain the total active power regulation based on the frequency regulation parameters and the preset frequency and power droop control characteristic model when it is determined that the frequency regulation stage has been entered. The regulation allocation module is used to split the total active power regulation amount according to the power regulation capability parameters of the new energy device, the power regulation capability parameters of the energy storage unit, and the power influence parameters of the new energy device, to obtain the active power regulation amount of each new energy device and the active power regulation amount of each energy storage unit. The power influence parameters are positively correlated with the active power regulation amount of the new energy device, and the power influence parameters have a corresponding relationship with the weighting coefficient. The weighting coefficient is positively correlated with the power influence parameters and is used to calculate the active power regulation amount of each new energy device. The control module is used to control each of the new energy devices to operate according to the corresponding active power adjustment amount, and to control each of the energy storage units to operate according to the corresponding active power adjustment amount, so as to achieve frequency regulation; The flexible exit execution module is used to determine the exit from the frequency regulation stage when the actual frequency of the grid connection point is within the non-frequency regulation frequency range; within a preset exit time, the portion of the total active power regulation in the target quadrant is superimposed with the total active power regulation over time to obtain the reduced or increased total active power regulation, which conforms to a sine wave.

9. A controller, characterized in that, This technology is applied to power systems, which include new energy devices and energy storage units. The energy storage units are connected to the new energy devices, and the new energy devices are connected to the power grid through a grid connection point. The controller includes a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, it implements the frequency regulation method of the power system as described in any one of claims 1 to 7.

10. An electric power system, characterized in that, include: New energy devices are connected to the power grid through a grid connection point; The energy storage unit is connected to the new energy device; The controller as described in claim 9 is used to control the new energy device and the energy storage unit.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, implement the frequency regulation method for a power system as described in any one of claims 1 to 7.

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