Method, system and equipment for controlling inertia and primary frequency modulation of energy storage power station and medium

Abstract

The invention belongs to the technical field of energy storage regulation and control, and discloses a control method, system and device for inertia and primary frequency modulation of an energy storage power station and a medium, and the control method comprises the steps: obtaining and monitoring the parameter information of the energy storage power station; whether the absolute value of the power grid frequency deviation meets a standard deviation value or not is judged, if not, parameter information of the energy storage power station continues to be obtained and monitored, and if yes, according to the parameter information of the energy storage power station and the sliding window time, the power grid frequency deviation is obtained. Calculating the inertia response of the energy storage power station and the total regulating quantity of the primary frequency modulation action by combining self-adaptive control and a lag filtering mechanism; and distributing the optimized inertia response of the energy storage power station and the total regulating variable of the primary frequency modulation action to each energy storage unit for response action through the energy storage power station control system, and continuously acquiring and monitoring key parameter information of the energy storage power station. According to the method, the frequency response stability and the adjustment precision of the energy storage power station are remarkably improved, and the robustness and the reliability of a power system under the condition of frequency abrupt change are enhanced.

Description

Technical Field

[0001] The present invention relates to the field of energy storage regulation technology, and in particular to a control method, system, equipment and medium for inertia and primary frequency regulation of an energy storage power station. Background Art

[0002] At present, the scale of new energy storage installed capacity is growing rapidly, my country's renewable energy is developing rapidly, and a high proportion of new energy connected to the grid has led to increasingly tight grid flexibility regulation resources and a continuous decline in the system's dynamic regulation capabilities. Faced with the difficulties and challenges faced by new power systems, energy storage power stations, as emerging grid-connected entities, need to be able to meet the grid's dynamic regulation capabilities, such as frequency regulation, peak regulation, and emergency power support.

[0003] Unlike traditional thermal power units that provide mechanical inertia support through the rotor and primary frequency regulation capability through boiler heat storage, the inertia and primary frequency regulation capabilities of energy storage power stations are both achieved through power electronic equipment, with fast, accurate and almost synchronous response times.

[0004] However, the inertia response of traditional thermal power units begins within a few hundred milliseconds of frequency fluctuations in the power grid, slowing down frequency changes through rapid energy exchange, and then the primary frequency regulation gradually takes over, gradually restoring the frequency to normal values ​​through continuous power regulation. The current control strategy of energy storage power stations is to generate inertia regulation according to the frequency change rate and primary frequency regulation according to the frequency deviation. Due to the high response speed of the energy storage system, the inertia response and primary frequency regulation will be started at the same time in a very short time. The two regulation quantities are generated and superimposed at the same time. In the case of rapid fluctuations in system frequency, the regulation quantity overshoots, which may cause further deterioration of the frequency.

[0005] Therefore, how to provide a control method, system, equipment and medium for the inertia and primary frequency regulation of energy storage power stations is a problem that needs to be solved urgently. Summary of the invention

[0006] The embodiments of the present invention provide a control method, system, device and medium for inertia and primary frequency modulation of an energy storage power station to solve the problems in the prior art.

[0007] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key / important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0008] According to a first aspect of an embodiment of the present invention, a method for controlling inertia and primary frequency regulation of an energy storage power station is provided.

[0009] In one embodiment, a method for controlling inertia and primary frequency regulation of an energy storage power station includes the following steps:

[0010] Based on the pre-configured sliding window time, the parameter information of the energy storage power station is obtained and monitored, wherein the parameter information of the energy storage power station includes the grid frequency deviation, the active load instruction of the energy storage power station, the primary frequency regulation action adjustment amount of the energy storage power station, the actual active power of the energy storage power station and the grid frequency deviation change rate;

[0011] Determine whether the absolute value of the grid frequency deviation satisfies the standard deviation value. If not, continue to obtain and monitor the parameter information of the energy storage power station. If satisfied, calculate the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action in combination with the adaptive control and hysteresis filtering mechanism according to the parameter information of the energy storage power station and the sliding window time.

[0012] The optimized inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action are distributed to each energy storage unit through the energy storage power station control system for response action, and the key parameter information of the energy storage power station is continuously acquired and monitored.

[0013] In one embodiment, the calculation of the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action based on the parameter information of the energy storage power station and the sliding window time, combined with the adaptive control and hysteresis filtering mechanism, includes the following steps:

[0014] The preliminary inertia response adjustment of the energy storage power station is calculated using the grid frequency deviation, sliding window time, grid rated frequency and rated active power of the energy storage power station;

[0015] Based on the hysteresis filter, the inertia adjustment power is smoothed, and the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount;

[0016] Based on the grid frequency deviation change rate, the adaptive inertia response adjustment amount is calculated through the inertia adjustment adaptive coefficient;

[0017] According to the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, the inertia response and the total adjustment amount of the primary frequency modulation action are dynamically calculated;

[0018] Based on the different operating states of the energy storage power station, the dynamic upper limit of the inertia response and the total regulation amount of the primary frequency regulation action is constrained and optimized through constraint conditions to obtain the final inertia response and the total regulation amount of the primary frequency regulation action.

[0019] In one embodiment, the calculation formula for calculating the preliminary inertia response adjustment amount of the energy storage power station by using the grid frequency deviation, the sliding window time, the grid rated frequency and the rated active power of the energy storage power station is:

[0020]

[0021] In the formula, ΔPI Indicates the initial inertia response adjustment of the energy storage power station, T I Represents the equivalent inertia time constant of the energy storage power station, f N represents the rated frequency of the power grid, Δt represents the sliding window time, P N It represents the rated active power of the energy storage power station, and Δf represents the grid frequency deviation.

[0022] In one embodiment, the inertia adjustment power is smoothed based on the hysteresis filter, and the calculation formula for calculating the filtered inertia response adjustment amount based on the preliminary inertia response adjustment amount is:

[0023]

[0024] In the formula, represents the inertia response adjustment after filtering, Δt represents the sliding window time, τ represents the time constant reflecting the filter response speed, ΔP I Indicates the initial inertia response adjustment of the energy storage power station. Indicates the inertia adjustment power after the last filtering.

[0025] In one embodiment, the calculation formula for calculating the adaptive inertia response adjustment amount by the inertia adjustment adaptive coefficient based on the grid frequency deviation change rate is:

[0026]

[0027] In the formula, Represents the adaptive inertia response adjustment amount, K α Indicates the inertia adjustment adaptive coefficient, represents the inertia response adjustment amount after filtering, α represents the attenuation factor, Δf represents the grid frequency deviation, and Δt represents the sliding window time.

[0028] In one embodiment, the formula for dynamically calculating the inertia response and the total adjustment amount of a frequency modulation action based on the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, is:

[0029]

[0030] In the formula, ΔP represents the total adjustment amount of inertia response and primary frequency modulation action, ΔP f Indicates the adjustment amount of the primary frequency regulation action of the energy storage power station. Represents the adaptive inertia response adjustment amount, Indicates the inertia response adjustment after filtering, Indicates the rate of change of grid frequency deviation.

[0031] In one embodiment, the constraints include:

[0032] If the grid frequency deviation is less than 0.1Hz, and the grid frequency deviation change rate is less than 0.02Hz / s, the energy storage power station is judged to be in normal state, and the inertia response and the total primary frequency regulation are limited to 1.1 times the primary frequency regulation action regulation;

[0033] If the grid frequency deviation is greater than 0.2Hz, or the grid frequency deviation change rate is greater than 0.1Hz / s, the energy storage power station is judged to be in an emergency state, and the inertia response and the total primary frequency regulation are limited to 1.5 times the primary frequency regulation;

[0034] If the grid frequency is under other conditions, the inertia response and the total primary frequency regulation amount are limited to 1.3 times the primary frequency regulation amount.

[0035] According to a second aspect of an embodiment of the present invention, a control system for inertia and primary frequency regulation of an energy storage power station is provided.

[0036] In one embodiment, the control system of the inertia and primary frequency regulation of the energy storage power station includes:

[0037] A parameter acquisition unit, used to acquire and monitor parameter information of the energy storage power station based on a pre-configured sliding window time, wherein the parameter information of the energy storage power station includes a grid frequency deviation, an active load instruction of the energy storage power station, a primary frequency regulation action adjustment amount of the energy storage power station, an actual active power of the energy storage power station, and a grid frequency deviation change rate;

[0038] A judgment unit, used to judge whether the absolute value of the grid frequency deviation satisfies the standard deviation value. If not, continue to obtain and monitor the parameter information of the energy storage power station. If satisfied, calculate the inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action in combination with the adaptive control and hysteresis filtering mechanism according to the parameter information of the energy storage power station and the sliding window time;

[0039] The control unit is used to distribute the optimized inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action to each energy storage unit for response action through the energy storage power station control system, and continuously obtain and monitor the key parameter information of the energy storage power station.

[0040] In one embodiment, the calculation of the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action based on the parameter information of the energy storage power station and the sliding window time, combined with the adaptive control and hysteresis filtering mechanism, includes:

[0041] The preliminary inertia response adjustment of the energy storage power station is calculated using the grid frequency deviation, sliding window time, grid rated frequency and rated active power of the energy storage power station;

[0042] Based on the hysteresis filter, the inertia adjustment power is smoothed, and the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount;

[0043] Based on the grid frequency deviation change rate, the adaptive inertia response adjustment amount is calculated through the inertia adjustment adaptive coefficient;

[0044] According to the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, the inertia response and the total adjustment amount of the primary frequency modulation action are dynamically calculated;

[0045] Based on the different operating states of the energy storage power station, the dynamic upper limit of the inertia response and the total regulation amount of the primary frequency regulation action is constrained and optimized through constraint conditions to obtain the final inertia response and the total regulation amount of the primary frequency regulation action.

[0046] In one embodiment, the calculation formula for calculating the preliminary inertia response adjustment amount of the energy storage power station by using the grid frequency deviation, the sliding window time, the grid rated frequency and the rated active power of the energy storage power station is:

[0047]

[0048] In the formula, ΔP I Indicates the initial inertia response adjustment of the energy storage power station, T I Represents the equivalent inertia time constant of the energy storage power station, f N represents the rated frequency of the power grid, Δt represents the sliding window time, P N It represents the rated active power of the energy storage power station, and Δf represents the grid frequency deviation.

[0049] In one embodiment, the inertia adjustment power is smoothed based on the hysteresis filter, and the calculation formula for calculating the filtered inertia response adjustment amount based on the preliminary inertia response adjustment amount is:

[0050]

[0051] In the formula, represents the inertia response adjustment after filtering, Δt represents the sliding window time, τ represents the time constant reflecting the filter response speed, ΔP I Indicates the initial inertia response adjustment of the energy storage power station. Indicates the inertia adjustment power after the last filtering.

[0052] In one embodiment, the calculation formula for calculating the adaptive inertia response adjustment amount by the inertia adjustment adaptive coefficient based on the grid frequency deviation change rate is:

[0053]

[0054] In the formula, Represents the adaptive inertia response adjustment amount, K α Indicates the inertia adjustment adaptive coefficient, represents the inertia response adjustment amount after filtering, α represents the attenuation factor, Δf represents the grid frequency deviation, and Δt represents the sliding window time.

[0055] In one embodiment, the formula for dynamically calculating the inertia response and the total adjustment amount of a frequency modulation action based on the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, is:

[0056]

[0057] In the formula, ΔP represents the total adjustment amount of inertia response and primary frequency modulation action, ΔP f Indicates the adjustment amount of the primary frequency regulation action of the energy storage power station. Represents the adaptive inertia response adjustment amount, Indicates the inertia response adjustment after filtering, Indicates the rate of change of grid frequency deviation.

[0058] In one embodiment, the constraints include:

[0059] If the grid frequency deviation is less than 0.1Hz, and the grid frequency deviation change rate is less than 0.02Hz / s, the energy storage power station is judged to be in normal state, and the inertia response and the total primary frequency regulation are limited to 1.1 times the primary frequency regulation action regulation;

[0060] If the grid frequency deviation is greater than 0.2Hz, or the grid frequency deviation change rate is greater than 0.1Hz / s, the energy storage power station is judged to be in an emergency state, and the inertia response and the total primary frequency regulation are limited to 1.5 times the primary frequency regulation;

[0061] If the grid frequency is under other conditions, the inertia response and the total primary frequency regulation amount are limited to 1.3 times the primary frequency regulation amount.

[0062] According to a third aspect of an embodiment of the present invention, a computer device is provided.

[0063] In some embodiments, the computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0064] According to a fourth aspect of embodiments of the present invention, a computer-readable storage medium is provided.

[0065] In one embodiment, the computer-readable storage medium stores a computer program, and the computer program implements the steps of the above method when executed by a processor.

[0066] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0067] The present invention provides an adaptive optimization control method for the inertia and primary frequency regulation capability of an energy storage power station, selects key parameters of the energy storage power station such as the grid frequency difference of the energy storage power station, the frequency difference change rate and the primary frequency regulation amount, and introduces an adaptive control and hysteresis filtering mechanism to optimize the inertia regulation of the energy storage power station in the initial stage of frequency change and the frequency stabilization stage. While improving the response speed, it effectively suppresses the power overshoot and oscillation caused by frequency fluctuations. At the same time, for the regulation state, by dynamically adjusting the upper limit coefficient of the total regulation amount, it is ensured that the energy storage power station can respond quickly in an emergency of the power system and smoothly return to a normal state when the frequency recovers. Compared with the prior art, the present invention significantly improves the frequency response stability and regulation accuracy of the energy storage power station, and enhances the robustness and reliability of the power system under frequency mutation.

[0068] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0070] Figure 1 is a flow chart of a method for controlling inertia and primary frequency regulation of an energy storage power station according to an exemplary embodiment;

[0071] Figure 2 is a principle block diagram of a control system for inertia and primary frequency regulation of an energy storage power station according to an exemplary embodiment;

[0072] Figure 3 is a structural schematic diagram of a computer device according to an exemplary embodiment;

[0073] Figure 4 is a principle flow chart of a method for controlling inertia and primary frequency regulation of an energy storage power station according to an exemplary embodiment;

[0074] Figure 5 It is a control process diagram of a method for controlling inertia and primary frequency regulation of an energy storage power station according to an exemplary embodiment. DETAILED DESCRIPTION

[0075] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0076] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0077] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0078] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0079] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0080] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0081] Each module in the device or system of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above modules.

[0082] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0083] Figure 1 and Figure 4-Figure 5 An embodiment of the method for controlling inertia and primary frequency regulation of an energy storage power station of the present invention is shown.

[0084] In this optional embodiment, the method for controlling the inertia and primary frequency regulation of the energy storage power station includes the following steps:

[0085] Step S101, based on the pre-configured sliding window time, obtain and monitor the key parameter information of the energy storage power station, the key parameter information of the energy storage power station includes the grid frequency deviation Δf, the active load instruction P of the energy storage power station s , Energy storage power station primary frequency regulation action adjustment amount ΔP f , Actual active power of energy storage power station P r and the grid frequency deviation change rate

[0086] Specifically, according to the requirements of the national standard GB / T 36547-2024 "Technical Regulations for the Connection of Electrochemical Energy Storage Power Stations to the Grid", the time window for calculating frequency changes should be 100ms-200ms, the sliding window time Δt is set to 200ms, and the inertia response dead zone of the energy storage power station is set to no more than ±0.05Hz. The standard setting is: when the absolute value of the frequency deviation |Δf| is greater than 0.05Hz, the inertia response action.

[0087] According to the requirements of the national standard GB / T 40595-2021 "Technical Regulations and Test Guidelines for Primary Frequency Regulation of Grid-connected Power Sources", the primary frequency regulation dead zone setting of the energy storage power station should not be greater than ±0.05Hz. The standard is set as follows: when the absolute value of the frequency deviation |Δf| is greater than 0.05Hz, the primary frequency regulation is actuated.

[0088] Step S103, determining whether the absolute value of the grid frequency deviation satisfies the standard deviation value. If not, continue to obtain and monitor the parameter information of the energy storage power station. If satisfied, calculate the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action in combination with the adaptive control and hysteresis filtering mechanism according to the parameter information of the energy storage power station and the sliding window time.

[0089] Step S105, the optimized inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action are distributed to each energy storage unit through the energy storage power station control system for response action, and the key parameter information of the energy storage power station is continuously acquired and monitored.

[0090] In this optional embodiment, when calculating the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action according to the parameter information and sliding window time of the energy storage power station and in combination with the adaptive control and hysteresis filtering mechanism, the preliminary inertia response adjustment amount of the energy storage power station can be calculated using the grid frequency deviation, sliding window time, grid rated frequency and rated active power of the energy storage power station; based on the hysteresis filter, the inertia adjustment power is smoothed, and the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount; based on the grid frequency deviation change rate, the adaptive inertia response adjustment amount is calculated by the inertia adjustment adaptive coefficient; based on the acquired grid frequency deviation and grid frequency deviation change rate, the inertia response and the total adjustment amount of the primary frequency modulation action are dynamically calculated in combination with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount; based on the different operating states of the energy storage power station, the dynamic upper limit of the inertia response and the total adjustment amount of the primary frequency modulation action is constrained and optimized through constraint conditions to obtain the final inertia response and the total adjustment amount of the primary frequency modulation action.

[0091] In this optional embodiment, the calculation formula for calculating the preliminary inertia response adjustment amount of the energy storage power station by using the grid frequency deviation, the sliding window time, the grid rated frequency and the rated active power of the energy storage power station is:

[0092]

[0093] In the formula, ΔP I Indicates the initial inertia response adjustment of the energy storage power station, T I represents the equivalent inertia time constant of the energy storage power station, which is set to 10s, f N represents the rated frequency of the power grid, which is set to 50Hz, Δt represents the sliding window time, P NIt represents the rated active power of the energy storage power station, and Δf represents the grid frequency deviation.

[0094] It should be noted that in the actual operation of energy storage power stations, in the early stage of frequency change, a smaller time window may cause the system to frequently calculate deviations to generate adjustment amounts, which in turn causes frequency fluctuations. In order to improve this situation, a lag filter is introduced to smooth the response of inertia regulation and reduce the impact of frequent switching.

[0095] In this optional embodiment, the inertia adjustment power is smoothed based on the hysteresis filter, and the calculation formula for the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount:

[0096]

[0097] In the formula, represents the inertia response adjustment after filtering, Δt represents the sliding window time, τ represents the time constant reflecting the filter response speed, ΔP I Indicates the initial inertia response adjustment of the energy storage power station. Indicates the inertia adjustment power after the last filtering. If there is no historical data, The value is the ΔP calculated currently. I , which is equivalent to skipping the first filtering, making it closer to the actual operating state, otherwise The value is the inertia adjustment power after the last filtering.

[0098] It should be noted that, considering the current control logic of the energy storage power station inertia and primary frequency regulation responding simultaneously and continuously, the regulation effects of the two are superimposed. When the grid frequency deviation is reduced and the system tends to be stable, the inertia response still produces regulation due to the existence of the frequency deviation change rate. The excessive response of inertia regulation causes the system to be unable to stabilize quickly. Therefore, the scope of inertia response is constrained. In the early stage of regulation, when the grid frequency deviation exceeds 0.1Hz or the frequency deviation change rate exceeds 0.02Hz / s, the primary frequency regulation and inertia regulation are set to be fully issued (full issuance means that the primary frequency regulation and inertia regulation are both theoretically calculated, without constraints, that is, the theoretical regulation (maximum value) is issued); otherwise, the inertia response regulation is multiplied by the adaptive coefficient.

[0099] In this optional embodiment, the calculation formula for calculating the adaptive inertia response adjustment amount by the inertia adjustment adaptive coefficient based on the grid frequency deviation change rate is:

[0100]

[0101] In the formula, Represents the adaptive inertia response adjustment amount, K α Indicates the inertia adjustment adaptive coefficient, It represents the inertia response adjustment amount after filtering, α represents the attenuation factor, which is used to control the sensitivity of the adaptive coefficient, Δf represents the grid frequency deviation, and Δt represents the sliding window time.

[0102] In this optional embodiment, the formula for dynamically calculating the inertia response and the total adjustment amount of a frequency modulation action based on the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, is:

[0103]

[0104] In the formula, ΔP represents the total adjustment amount of inertia response and primary frequency modulation action, ΔP f Indicates the adjustment amount of the primary frequency regulation action of the energy storage power station. Represents the adaptive inertia response adjustment amount, Indicates the inertia response adjustment amount after filtering.

[0105] It should be noted that in order to avoid the situation where the adjustment amount of the primary frequency regulation and inertia superposition is too large in the initial stage of regulation, and the frequency difference of the power grid is too large and the regulation effect is insufficient, different upper limit coefficients of the adjustment amount are introduced to constrain the total adjustment amount.

[0106] In this optional embodiment, the constraints include:

[0107] If the grid frequency deviation is less than 0.1Hz, and the grid frequency deviation change rate is less than 0.02Hz / s, the energy storage power station is judged to be in normal state, and the inertia response and the total primary frequency regulation are limited to 1.1 times the primary frequency regulation action regulation;

[0108] If the grid frequency deviation is greater than 0.2Hz, or the grid frequency deviation change rate is greater than 0.1Hz / s, the energy storage power station is judged to be in an emergency state, and the inertia response and the total primary frequency regulation are limited to 1.5 times the primary frequency regulation;

[0109] If the grid frequency is under other conditions, the inertia response and the total primary frequency regulation amount are limited to 1.3 times the primary frequency regulation amount.

[0110] Specifically, the constraint judgment formula is:

[0111]

[0112] ΔP represents the total adjustment amount of inertia response and primary frequency modulation action, ΔP f represents the frequency regulation amount of the energy storage power station, Δt represents the sliding window time, Indicates the rate of change of grid frequency deviation.

[0113] Specifically, the primary frequency regulation and inertia regulation of the energy storage power station are optimized through adaptive control and hysteresis filtering mechanism, and a low-pass filtering algorithm is set to smooth the response of inertia regulation to reduce the impact of frequent switching; then, an adaptive adjustment coefficient is introduced based on the frequency deviation change rate to reasonably control the inertia adjustment amount to ensure that the inertia regulation can adapt quickly and effectively under different frequency change rates; further, the solution results must meet the dynamic upper limit coefficient constraints of different operating states, a lower upper limit is set in normal state to ensure stability, and an appropriate increase in the upper limit in emergency state to ensure rapid response and smooth transition. Finally, the adaptive optimization results considering filter hysteresis under the constraints are obtained.

[0114] Figure 2 An embodiment of the control system for inertia and primary frequency regulation of an energy storage power station of the present invention is shown.

[0115] In this optional embodiment, the control system of the energy storage power station inertia and primary frequency regulation includes:

[0116] The parameter acquisition unit 201 is used to acquire and monitor parameter information of the energy storage power station based on a pre-configured sliding window time, wherein the parameter information of the energy storage power station includes a grid frequency deviation, an active load instruction of the energy storage power station, a primary frequency regulation action adjustment amount of the energy storage power station, an actual active power of the energy storage power station, and a grid frequency deviation change rate;

[0117] The judgment unit 203 is used to judge whether the absolute value of the grid frequency deviation meets the standard deviation value. If not, continue to obtain and monitor the parameter information of the energy storage power station. If it meets, calculate the inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action in combination with the adaptive control and hysteresis filtering mechanism according to the parameter information of the energy storage power station and the sliding window time;

[0118] The control unit 205 is used to distribute the optimized inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action to each energy storage unit for response action through the energy storage power station control system, and continuously obtain and monitor key parameter information of the energy storage power station.

[0119] In this optional embodiment, the calculation of the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action based on the parameter information of the energy storage power station and the sliding window time, combined with the adaptive control and hysteresis filtering mechanism, includes:

[0120] The preliminary inertia response adjustment of the energy storage power station is calculated using the grid frequency deviation, sliding window time, grid rated frequency and rated active power of the energy storage power station;

[0121] Based on the hysteresis filter, the inertia adjustment power is smoothed, and the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount;

[0122] Based on the grid frequency deviation change rate, the adaptive inertia response adjustment amount is calculated through the inertia adjustment adaptive coefficient;

[0123] According to the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, the inertia response and the total adjustment amount of the primary frequency modulation action are dynamically calculated;

[0124] Based on the different operating states of the energy storage power station, the dynamic upper limit of the inertia response and the total regulation amount of the primary frequency regulation action is constrained and optimized through constraint conditions to obtain the final inertia response and the total regulation amount of the primary frequency regulation action.

[0125] In this optional embodiment, the calculation formula for calculating the preliminary inertia response adjustment amount of the energy storage power station by using the grid frequency deviation, the sliding window time, the grid rated frequency and the rated active power of the energy storage power station is:

[0126]

[0127] In the formula, ΔP I Indicates the initial inertia response adjustment of the energy storage power station, T I Represents the equivalent inertia time constant of the energy storage power station, f N represents the rated frequency of the power grid, Δt represents the sliding window time, P N It represents the rated active power of the energy storage power station, and Δf represents the grid frequency deviation.

[0128] In this optional embodiment, the inertia adjustment power is smoothed based on the hysteresis filter, and the calculation formula for the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount:

[0129]

[0130] In the formula, represents the inertia response adjustment after filtering, Δt represents the sliding window time, τ represents the time constant reflecting the filter response speed, ΔP I Indicates the initial inertia response adjustment of the energy storage power station. Indicates the inertia adjustment power after the last filtering.

[0131] In this optional embodiment, the calculation formula for calculating the adaptive inertia response adjustment amount by the inertia adjustment adaptive coefficient based on the grid frequency deviation change rate is:

[0132]

[0133] In the formula, Represents the adaptive inertia response adjustment amount, K α Indicates the inertia adjustment adaptive coefficient, represents the inertia response adjustment amount after filtering, α represents the attenuation factor, Δf represents the grid frequency deviation, and Δt represents the sliding window time.

[0134] In this optional embodiment, the formula for dynamically calculating the inertia response and the total adjustment amount of a frequency modulation action based on the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, is:

[0135]

[0136] In the formula, ΔP represents the total adjustment amount of inertia response and primary frequency modulation action, ΔP f Indicates the adjustment amount of the primary frequency regulation action of the energy storage power station. Represents the adaptive inertia response adjustment amount, Indicates the inertia response adjustment amount after filtering.

[0137] In this optional embodiment, the constraints include:

[0138] If the grid frequency deviation is less than 0.1Hz, and the grid frequency deviation change rate is less than 0.02Hz / s, the energy storage power station is judged to be in normal state, and the inertia response and the total primary frequency regulation are limited to 1.1 times the primary frequency regulation action regulation;

[0139] If the grid frequency deviation is greater than 0.2Hz, or the grid frequency deviation change rate is greater than 0.1Hz / s, the energy storage power station is judged to be in an emergency state, and the inertia response and the total primary frequency regulation are limited to 1.5 times the primary frequency regulation;

[0140] If the grid frequency is under other conditions, the inertia response and the total primary frequency regulation amount are limited to 1.3 times the primary frequency regulation amount.

[0141] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 3 As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in the above method embodiment are implemented.

[0142] Those skilled in the art will understand that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0143] In addition, the present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiment when executing the computer program.

[0144] In addition, the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiment are implemented.

[0145] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0146] The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for controlling inertia and primary frequency modulation of an energy storage power station, characterized in that: The control method of the inertia and primary frequency regulation of the energy storage power station comprises the following steps: Based on the pre-configured sliding window time, the parameter information of the energy storage power station is obtained and monitored, wherein the parameter information of the energy storage power station includes the grid frequency deviation, the active load instruction of the energy storage power station, the primary frequency regulation action adjustment amount of the energy storage power station, the actual active power of the energy storage power station and the grid frequency deviation change rate; Determine whether the absolute value of the grid frequency deviation satisfies the standard deviation value. If not, continue to obtain and monitor the parameter information of the energy storage power station. If satisfied, calculate the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action in combination with the adaptive control and hysteresis filtering mechanism according to the parameter information of the energy storage power station and the sliding window time. The optimized inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action are distributed to each energy storage unit through the energy storage power station control system for response action, and the key parameter information of the energy storage power station is continuously acquired and monitored.

2. The method for controlling inertia and primary frequency modulation of an energy storage power station according to claim 1, characterized in that: The method of calculating the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action according to the parameter information of the energy storage power station and the sliding window time and combining the adaptive control and hysteresis filtering mechanism includes the following steps: The preliminary inertia response adjustment of the energy storage power station is calculated using the grid frequency deviation, sliding window time, grid rated frequency and rated active power of the energy storage power station; Based on the hysteresis filter, the inertia adjustment power is smoothed, and the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount; Based on the grid frequency deviation change rate, the adaptive inertia response adjustment amount is calculated through the inertia adjustment adaptive coefficient; According to the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, the inertia response and the total adjustment amount of the primary frequency modulation action are dynamically calculated; Based on the different operating states of the energy storage power station, the dynamic upper limit of the inertia response and the total regulation amount of the primary frequency regulation action is constrained and optimized through constraint conditions to obtain the final inertia response and the total regulation amount of the primary frequency regulation action.

3. The method for controlling inertia and primary frequency modulation of an energy storage power station according to claim 2, characterized in that: The calculation formula for calculating the preliminary inertia response adjustment amount of the energy storage power station by using the grid frequency deviation, the sliding window time, the grid rated frequency and the rated active power of the energy storage power station is: In the formula, ΔP I Indicates the initial inertia response adjustment of the energy storage power station, T I Represents the equivalent inertia time constant of the energy storage power station, f N represents the rated frequency of the power grid, Δt represents the sliding window time, P N It represents the rated active power of the energy storage power station, and Δf represents the grid frequency deviation.

4. The method for controlling inertia and primary frequency modulation of an energy storage power station according to claim 2, characterized in that: The inertia adjustment power is smoothed based on the hysteresis filter, and the calculation formula of the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount: In the formula, represents the inertia response adjustment after filtering, Δt represents the sliding window time, τ represents the time constant reflecting the filter response speed, ΔP I Indicates the initial inertia response adjustment of the energy storage power station. Indicates the inertia adjustment power after the last filtering.

5. The method for controlling inertia and primary frequency modulation of an energy storage power station according to claim 2, characterized in that: The calculation formula for calculating the adaptive inertia response adjustment amount based on the grid frequency deviation change rate through the inertia adjustment adaptive coefficient is: In the formula, Represents the adaptive inertia response adjustment amount, K α Indicates the inertia adjustment adaptive coefficient, represents the inertia response adjustment amount after filtering, α represents the attenuation factor, Δf represents the grid frequency deviation, and Δt represents the sliding window time.

6. The method for controlling inertia and primary frequency modulation of an energy storage power station according to claim 2, characterized in that: The formula for dynamically calculating the inertia response and the total adjustment amount of a frequency modulation action according to the obtained grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, is: In the formula, ΔP represents the total adjustment amount of inertia response and primary frequency modulation action, ΔP f Indicates the adjustment amount of the primary frequency regulation action of the energy storage power station. Represents the adaptive inertia response adjustment amount, Indicates the inertia response adjustment amount after filtering.

7. The method for controlling inertia and primary frequency modulation of an energy storage power station according to claim 2, characterized in that: The constraints include: If the grid frequency deviation is less than 0.1Hz, and the grid frequency deviation change rate is less than 0.02Hz / s, the energy storage power station is judged to be in normal state, and the inertia response and the total primary frequency regulation are limited to 1.1 times the primary frequency regulation action regulation; If the grid frequency deviation is greater than 0.2Hz, or the grid frequency deviation change rate is greater than 0.1Hz / s, the energy storage power station is judged to be in an emergency state, and the inertia response and the total primary frequency regulation are limited to 1.5 times the primary frequency regulation; If the grid frequency is under other conditions, the inertia response and the total primary frequency regulation amount are limited to 1.3 times the primary frequency regulation amount.

8. The control system of inertia and primary frequency regulation of energy storage power station is characterized by: The control system for the inertia and primary frequency regulation of the energy storage power station includes: A parameter acquisition unit, used to acquire and monitor parameter information of the energy storage power station based on a pre-configured sliding window time, wherein the parameter information of the energy storage power station includes a grid frequency deviation, an active load instruction of the energy storage power station, a primary frequency regulation action adjustment amount of the energy storage power station, an actual active power of the energy storage power station, and a grid frequency deviation change rate; A judgment unit, used to judge whether the absolute value of the grid frequency deviation satisfies the standard deviation value. If not, continue to obtain and monitor the parameter information of the energy storage power station. If satisfied, calculate the inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action in combination with the adaptive control and hysteresis filtering mechanism according to the parameter information of the energy storage power station and the sliding window time; The control unit is used to distribute the optimized inertia response of the energy storage power station and the total adjustment amount of the primary frequency regulation action to each energy storage unit for response action through the energy storage power station control system, and continuously obtain and monitor the key parameter information of the energy storage power station.

9. The control system for inertia and primary frequency regulation of an energy storage power station according to claim 8, characterized in that: The calculation of the inertia response of the energy storage power station and the total adjustment amount of the primary frequency modulation action based on the parameter information of the energy storage power station and the sliding window time, combined with the adaptive control and hysteresis filtering mechanism, includes: The preliminary inertia response adjustment of the energy storage power station is calculated using the grid frequency deviation, sliding window time, grid rated frequency and rated active power of the energy storage power station; Based on the hysteresis filter, the inertia adjustment power is smoothed, and the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount; Based on the grid frequency deviation change rate, the adaptive inertia response adjustment amount is calculated through the inertia adjustment adaptive coefficient; According to the obtained values ​​of the grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, the inertia response and the total adjustment amount of the primary frequency modulation action are dynamically calculated; Based on the different operating states of the energy storage power station, the dynamic upper limit of the inertia response and the total regulation amount of the primary frequency regulation action is constrained and optimized through constraint conditions to obtain the final inertia response and the total regulation amount of the primary frequency regulation action.

10. The control system for inertia and primary frequency regulation of an energy storage power station according to claim 9, characterized in that: The calculation formula for calculating the preliminary inertia response adjustment amount of the energy storage power station by using the grid frequency deviation, the sliding window time, the grid rated frequency and the rated active power of the energy storage power station is: In the formula, ΔP I Indicates the initial inertia response adjustment of the energy storage power station, T I Represents the equivalent inertia time constant of the energy storage power station, f N represents the rated frequency of the power grid, Δt represents the sliding window time, P N It represents the rated active power of the energy storage power station, and Δf represents the grid frequency deviation.

11. The control system for inertia and primary frequency regulation of an energy storage power station according to claim 9, characterized in that: The inertia adjustment power is smoothed based on the hysteresis filter, and the calculation formula of the filtered inertia response adjustment amount is calculated based on the preliminary inertia response adjustment amount: In the formula, represents the inertia response adjustment after filtering, Δt represents the sliding window time, τ represents the time constant reflecting the filter response speed, ΔP I Indicates the initial inertia response adjustment of the energy storage power station. Indicates the inertia adjustment power after the last filtering.

12. The control system for inertia and primary frequency regulation of an energy storage power station according to claim 9, characterized in that: The calculation formula for calculating the adaptive inertia response adjustment amount based on the grid frequency deviation change rate through the inertia adjustment adaptive coefficient is: In the formula, Represents the adaptive inertia response adjustment amount, K α Indicates the inertia adjustment adaptive coefficient, represents the inertia response adjustment amount after filtering, α represents the attenuation factor, Δf represents the grid frequency deviation, and Δt represents the sliding window time.

13. The control system for inertia and primary frequency regulation of an energy storage power station according to claim 9, characterized in that: The formula for dynamically calculating the inertia response and the total adjustment amount of a frequency modulation action according to the obtained grid frequency deviation and the grid frequency deviation change rate, combined with the filtered inertia response adjustment amount and the adaptive inertia response adjustment amount, is: In the formula, ΔP represents the total adjustment amount of inertia response and primary frequency modulation action, ΔP f Indicates the adjustment amount of the primary frequency regulation action of the energy storage power station. Represents the adaptive inertia response adjustment amount, Indicates the inertia response adjustment after filtering, Indicates the rate of change of grid frequency deviation.

14. The control system for inertia and primary frequency regulation of an energy storage power station according to claim 9, characterized in that: The constraints include: If the grid frequency deviation is less than 0.1Hz, and the grid frequency deviation change rate is less than 0.02Hz / s, the energy storage power station is judged to be in normal state, and the inertia response and the total primary frequency regulation are limited to 1.1 times the primary frequency regulation action regulation; If the grid frequency deviation is greater than 0.2Hz, or the grid frequency deviation change rate is greater than 0.1Hz / s, the energy storage power station is judged to be in an emergency state, and the inertia response and the total primary frequency regulation are limited to 1.5 times the primary frequency regulation; If the grid frequency is under other conditions, the inertia response and the total primary frequency regulation amount are limited to 1.3 times the primary frequency regulation amount.

15. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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