Frequency modulation effect evaluation method, device, equipment and storage medium

Abstract

The present application discloses a frequency modulation effect evaluation method, device, equipment and storage medium, which relates to the field of power grid frequency modulation technology. The method includes: determining a frequency modulation comprehensive effect evaluation index when a wind farm performs a primary frequency modulation; determining an evaluation result impact weight corresponding to the frequency modulation comprehensive effect evaluation index; determining a frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation index and the evaluation result impact weight; and obtaining a frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the frequency modulation comprehensive effect evaluation function value. The present invention determines a frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation index of the primary frequency modulation of the wind farm and its corresponding impact weight, and obtains a frequency modulation effect evaluation result according to the frequency modulation comprehensive effect evaluation function value, which solves the technical problem that the frequency modulation effect evaluation method in the prior art only considers the frequency modulation dynamic performance when performing the frequency modulation effect evaluation, resulting in the inability to fully understand the frequency modulation control method and the frequency modulation effect.

Description

Technical Field

[0001] The present application relates to the technical field of power grid frequency modulation, and in particular to a method, device, equipment and storage medium for evaluating frequency modulation effects. Background Art

[0002] With the large-scale access of wind power generation systems, the volatility and uncertainty of their output pose great challenges to the safe and stable operation of the power grid, especially the stability of the system frequency. Therefore, it is indispensable to carry out primary frequency regulation of the power grid at wind farms.

[0003] The existing wind farm control methods for primary frequency regulation mainly include pitch angle control, rotor overspeed control, wind-storage joint control, etc. In order to ensure the frequency stability of the wind farm, it is usually necessary to evaluate the frequency regulation effect of these primary frequency regulation control methods after the primary frequency regulation. At present, the frequency regulation effect of the frequency regulation control method can be evaluated from the perspective of frequency regulation dynamic performance according to standard specifications. However, this frequency regulation effect evaluation method only considers the frequency regulation dynamic performance during the evaluation, and it is impossible to fully understand the frequency regulation control method and frequency regulation effect, so it is impossible to achieve the optimal control effect and the optimal regulation economy at the same time.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present application is to provide a method, device, equipment and storage medium for evaluating frequency modulation effects, aiming to solve the technical problem that the frequency modulation effect evaluation method in the prior art only considers the frequency modulation dynamic performance when evaluating the frequency modulation effect, resulting in an inability to fully understand the frequency modulation control method and the frequency modulation effect.

[0006] To achieve the above purpose, the present application proposes a method for evaluating frequency modulation effect, the method comprising:

[0007] Determine the comprehensive frequency regulation effect evaluation index of the wind farm during the primary frequency regulation;

[0008] Determine the impact weight of the evaluation result corresponding to the frequency modulation comprehensive effect evaluation index;

[0009] Determine the frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation index and the evaluation result impact weight;

[0010] The frequency modulation effect evaluation result corresponding to the primary frequency modulation is obtained according to the frequency modulation comprehensive effect evaluation function value.

[0011] In one embodiment, the frequency regulation comprehensive effect evaluation index includes: an equipment self-impact index; the step of determining the frequency regulation comprehensive effect evaluation index when the wind farm performs a frequency regulation includes:

[0012] Obtaining the frequency modulation control cycle of the wind farm when performing a frequency modulation, the number of wind turbines, the maximum allowable change rate of the pitch angle and the maximum allowable change rate of the speed of each wind turbine in the wind farm, the maximum value and the minimum value of the pitch angle of each wind turbine in a single cycle, and the maximum speed and the minimum speed;

[0013] Determine a wind turbine pitch angle change rate index based on the frequency modulation control period, the number of wind turbines, the maximum allowable change rate of the pitch angle, the maximum pitch angle value, and the minimum pitch angle value;

[0014] Determine a speed change rate index based on the frequency modulation control period, the number of wind turbines, the maximum allowable speed change rate, the maximum speed value and the minimum speed value;

[0015] Determine the energy storage charge and discharge depth index based on the number of energy storage battery clusters and the real-time charge state of each battery cluster at the end of a single cycle control;

[0016] The device self-influence index corresponding to the primary frequency modulation is determined based on the wind turbine pitch angle change rate index, the speed change rate index and the energy storage charge and discharge depth index.

[0017] In one embodiment, the frequency regulation comprehensive effect evaluation index includes: a frequency regulation economic cost index; the step of determining the frequency regulation comprehensive effect evaluation index when the wind farm performs a frequency regulation comprises:

[0018] Determine the average annual pitch angle reserve cost, average annual speed reserve cost and average annual energy storage construction cost of all wind turbines in the wind farm;

[0019] Determine the total compensation fee for the wind farm based on historical frequency regulation data, where the total compensation fee is the sum of the maximum assessment penalty fee when the wind farm has frequency regulation anomalies within a preset time period and the compensation fee obtained by participating in a frequency regulation service;

[0020] Determining a pitch angle standby cost index according to the annual average pitch angle standby cost and the sum of the compensation costs;

[0021] Determine a speed reserve cost index according to the sum of the annual average speed reserve cost, energy storage and the compensation fee;

[0022] Determine the energy storage construction cost index according to the sum of the average annual construction cost of the energy storage and the compensation fee;

[0023] The frequency regulation economic cost index corresponding to the primary frequency regulation is determined based on the pitch angle standby cost index, the speed standby cost index and the energy storage construction cost index.

[0024] In one embodiment, the step of determining the annual average pitch angle standby cost, the annual average speed standby cost and the annual average energy storage construction cost of all wind turbines in the wind farm comprises:

[0025] Determine the annual average pitch angle standby cost of all wind turbines in the wind farm based on the number of wind turbines in the wind farm, the wind turbine pitch angle standby cost coefficient, the first maximum power that can be generated, and the actual operating power of each wind turbine under the current working condition, wherein the first maximum power that can be generated is the maximum power that can be generated corresponding to the optimal pitch angle when the speed of each wind turbine remains unchanged;

[0026] Determine the annual average speed standby cost of all wind turbines based on the number of wind turbines, the wind turbine speed standby cost coefficient, the second maximum power and the actual operating power, wherein the second maximum power is the maximum power corresponding to the optimal speed when the pitch angle of each wind turbine remains unchanged;

[0027] The average annual construction cost of energy storage for all wind turbines in the field is determined based on the total construction cost of the energy storage system and the service life of the energy storage system.

[0028] In one embodiment, the frequency regulation comprehensive effect evaluation index includes: a frequency regulation dynamic performance index; the step of determining the frequency regulation comprehensive effect evaluation index when the wind farm performs a frequency regulation comprises:

[0029] Obtaining the actual response lag time, actual response rise time, actual response adjustment time and actual response steady-state deviation of the wind farm when performing a frequency modulation;

[0030] Determining a response lag time performance indicator according to the actual response lag time and a preset response lag time threshold;

[0031] Determine a rise time performance indicator according to the actual response rise time and a preset response rise time threshold;

[0032] Determine an adjustment time performance indicator according to the actual response adjustment time and a preset adjustment time threshold;

[0033] Determining a steady-state deviation performance indicator according to the actual response steady-state deviation and a preset steady-state deviation threshold;

[0034] The frequency modulation dynamic performance index corresponding to the primary frequency modulation is determined based on the response lag time performance index, the rise time performance index, the adjustment time performance index and the steady-state deviation performance index.

[0035] In one embodiment, the step of determining the evaluation result impact weight corresponding to the frequency modulation comprehensive effect evaluation index includes:

[0036] Determine the first evaluation result influence weight corresponding to the equipment's own influence index, the second evaluation result influence weight corresponding to the frequency modulation economic cost index, and the third evaluation result influence weight corresponding to the frequency modulation dynamic performance index;

[0037] The step of determining the value of the frequency modulation comprehensive effect evaluation function based on the frequency modulation comprehensive effect evaluation index and the evaluation result influence weight comprises:

[0038] The frequency modulation comprehensive effect evaluation function value is determined based on the equipment's own impact index, the frequency modulation economic cost index, the frequency modulation dynamic performance index, the first evaluation result impact weight, the second evaluation result impact weight and the third evaluation result impact weight.

[0039] In one embodiment, the step of determining the first evaluation result influence weight corresponding to the device's own influence index, the second evaluation result influence weight corresponding to the frequency modulation economic cost index, and the third evaluation result influence weight corresponding to the frequency modulation dynamic performance index includes:

[0040] Acquire a first indicator value according to the wind turbine pitch angle change rate indicator, the speed change rate indicator and the energy storage charge and discharge depth indicator;

[0041] Acquire a second indicator value according to the pitch angle standby cost indicator, the speed standby cost indicator and the energy storage construction cost indicator;

[0042] Acquire a third indicator value according to the response lag time performance indicator, the rise time performance indicator, the adjustment time performance indicator and the steady-state deviation performance indicator;

[0043] Based on the first indicator value, the second indicator value and the third indicator value, determine the first evaluation result influence weight corresponding to the equipment's own influence index, the second evaluation result influence weight corresponding to the frequency modulation economic cost index, and the third evaluation result influence weight corresponding to the frequency modulation dynamic performance index.

[0044] In addition, to achieve the above purpose, the present application also proposes a frequency modulation effect evaluation device, the device comprising:

[0045] An evaluation index determination module is used to determine the frequency regulation comprehensive effect evaluation index of the wind farm when performing a frequency regulation;

[0046] An impact weight determination module is used to determine the impact weight of the evaluation result corresponding to the frequency modulation comprehensive effect evaluation index;

[0047] A function value determination module, used to determine the frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation index and the evaluation result influence weight;

[0048] An evaluation result acquisition module is used to obtain the frequency modulation effect evaluation result corresponding to the first frequency modulation according to the frequency modulation comprehensive effect evaluation function value.

[0049] In addition, to achieve the above-mentioned purpose, the present application also proposes a frequency modulation effect evaluation device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the frequency modulation effect evaluation method described above.

[0050] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the frequency modulation effect evaluation method described above are implemented.

[0051] The present application provides a frequency modulation effect evaluation method, which discloses determining a comprehensive frequency modulation effect evaluation index when a wind farm performs a primary frequency modulation; determining an evaluation result influence weight corresponding to the comprehensive frequency modulation effect evaluation index; determining a comprehensive frequency modulation effect evaluation function value based on the comprehensive frequency modulation effect evaluation index and the evaluation result influence weight; obtaining a frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the comprehensive frequency modulation effect evaluation function value; compared with the prior art in which the frequency modulation effect of a frequency modulation control method is evaluated from the perspective of frequency modulation dynamic performance according to standard specifications, and the frequency modulation control method and the frequency modulation effect cannot be fully understood, the present invention determines the comprehensive frequency modulation effect evaluation function value based on the comprehensive frequency modulation effect evaluation index of the primary frequency modulation of the wind farm and the corresponding evaluation result influence weight, and obtains the frequency modulation effect evaluation result of the primary frequency modulation according to the comprehensive frequency modulation effect evaluation function value, thereby solving the technical problem that the frequency modulation effect evaluation method in the prior art only considers the dynamic performance of frequency modulation when performing frequency modulation effect evaluation, resulting in the inability to fully understand the frequency modulation control method and the frequency modulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0053] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0054] Figure 1 A flowchart of the first embodiment of the frequency modulation effect evaluation method of the present application is provided;

[0055] Figure 2 A flow chart of the second embodiment of the frequency modulation effect evaluation method of the present application;

[0056] Figure 3 A flowchart of the third embodiment of the frequency modulation effect evaluation method of the present application is provided;

[0057] Figure 4 This is the overall flow chart of the frequency modulation effect evaluation method for this application;

[0058] Figure 5 This is a schematic diagram of the module structure of the frequency modulation effect evaluation device according to an embodiment of the present application;

[0059] Figure 6 Schematic diagram of the device structure of the hardware operating environment involved in the frequency modulation effect evaluation method in the embodiment of the present application.

[0060] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0061] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0062] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0063] The main solution of the embodiment of the present application is: determine the comprehensive frequency modulation effect evaluation index of the wind farm when performing primary frequency modulation; determine the evaluation result influence weight corresponding to the comprehensive frequency modulation effect evaluation index; determine the comprehensive frequency modulation effect evaluation function value based on the comprehensive frequency modulation effect evaluation index and the evaluation result influence weight; obtain the frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the comprehensive frequency modulation effect evaluation function value.

[0064] In the prior art, the frequency modulation effect of the frequency modulation control method is evaluated from the perspective of frequency modulation dynamic performance according to standard specifications. However, this frequency modulation effect evaluation method only considers the frequency modulation dynamic performance during the evaluation. At this time, it is impossible to have a comprehensive understanding of the frequency modulation control method and the frequency modulation effect, thereby failing to achieve the optimal control effect and the optimal regulation economy at the same time.

[0065] The present application provides a solution, which can determine the comprehensive frequency modulation effect evaluation function value based on the comprehensive frequency modulation effect evaluation index of the primary frequency regulation of the wind farm and its corresponding evaluation result impact weight, and obtain the frequency modulation effect evaluation result of the primary frequency regulation according to the comprehensive frequency modulation effect evaluation function value, thereby solving the technical problem that the frequency modulation effect evaluation method in the prior art only considers the dynamic performance of the frequency regulation when performing the frequency regulation effect evaluation, resulting in the inability to fully understand the frequency regulation control method and the frequency regulation effect.

[0066] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a frequency modulation effect evaluation device, etc. The following takes the frequency modulation effect evaluation device as an example (hereinafter referred to as the device) to illustrate this embodiment and the following embodiments.

[0067] Based on this, the present application embodiment provides a method for evaluating frequency modulation effect, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the frequency modulation effect evaluation method of the present application.

[0068] In this embodiment, the frequency modulation effect evaluation method includes steps S10 to S40:

[0069] Step S10: determining a frequency regulation comprehensive effect evaluation index when the wind farm performs a frequency regulation.

[0070] It should be noted that the above-mentioned frequency modulation comprehensive effect evaluation index can be an index used to evaluate the frequency modulation effect of a primary frequency modulation. The frequency modulation comprehensive effect evaluation index in this embodiment may include: equipment self-influence index, frequency modulation economic cost index and frequency modulation dynamic performance index, wherein the equipment self-influence index can be an equipment self-indicator that affects the frequency modulation effect, including: a wind turbine pitch angle change rate index, a speed change rate index and an energy storage charge and discharge depth index; the frequency modulation economic cost index can be an economic cost index that affects the frequency modulation effect, including: a pitch angle standby cost index, a speed standby cost index, and an energy storage construction cost index; the frequency modulation dynamic performance index can be a performance index that affects the frequency modulation effect, including: a response lag time performance index, a rise time performance index, an adjustment time performance index, and a steady-state deviation performance index.

[0071] Step S20: Determine the evaluation result impact weight corresponding to the frequency modulation comprehensive effect evaluation index.

[0072] It should be understood that the above-mentioned evaluation result impact weight may be a value representing the degree of influence of the comprehensive frequency modulation effect evaluation index on the frequency modulation effect evaluation result.

[0073] Step S30: Determine the frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation index and the evaluation result influence weight.

[0074] It can be understood that the above frequency modulation comprehensive effect evaluation function value can be a value representing the frequency modulation effect of the current primary frequency modulation. In practical applications, considering that the larger the values of various factor indicators, the greater the negative impact on the equipment, the higher the frequency modulation cost, and the worse the frequency modulation dynamic performance, therefore, the proportion weights of these three aspects of factors can be combined, and a risk-preference type utility function can be used to construct an evaluation function for the comprehensive effect of the combined primary frequency modulation of wind power storage. Then, the frequency modulation comprehensive effect evaluation function value can be calculated based on the indicator values and influence weights corresponding to the above frequency modulation comprehensive effect evaluation indicators through this frequency modulation comprehensive effect evaluation function.

[0075] Step S40: Obtain the frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the frequency modulation comprehensive effect evaluation function value.

[0076] In this embodiment, corresponding frequency modulation effect levels can be set in advance for different ranges of frequency modulation comprehensive effect evaluation function values. For example, for the frequency modulation comprehensive effect evaluation function value F( ), if 0 ≤ F( ) ≤ 1, the evaluation result of its corresponding frequency modulation effect is: excellent; if 1 < F( ) ≤ 2, the corresponding frequency modulation effect level is: good; if 2 < F( ) ≤ 3.5, the evaluation result of its corresponding frequency modulation effect is: qualified; if F( ) > 3.5, the evaluation result of its corresponding frequency modulation effect is: unqualified. After calculating the frequency modulation comprehensive effect evaluation function value in this embodiment, the evaluation result of the frequency modulation effect corresponding to this primary frequency modulation can be determined, and then the frequency modulation effect evaluation result corresponding to the primary frequency modulation can be obtained.

[0077] This embodiment provides a method for evaluating the frequency modulation effect. This method discloses determining the frequency modulation comprehensive effect evaluation indicators when a wind farm conducts primary frequency modulation; determining the influence weights of the evaluation results corresponding to the frequency modulation comprehensive effect evaluation indicators; determining the frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation indicators and the evaluation result influence weights; obtaining the frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the frequency modulation comprehensive effect evaluation function value; compared with the prior art that evaluates the frequency modulation effect of the frequency modulation control method from the perspective of frequency modulation dynamic performance according to standards and specifications, it is impossible to comprehensively understand the frequency modulation control method and the frequency modulation effect. Since this embodiment determines the frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation indicators of the wind farm's primary frequency modulation and their corresponding evaluation result influence weights, and obtains the frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the frequency modulation comprehensive effect evaluation function value, the technical problem that the prior art's frequency modulation effect evaluation method only considers the frequency modulation dynamic performance when evaluating the frequency modulation effect, resulting in the inability to comprehensively understand the frequency modulation control method and the frequency modulation effect, is solved.

[0078] Based on the first embodiment of the present application, in the second embodiment of the present application, for the same or similar content as the above-mentioned embodiment one, reference can be made to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 2 , Figure 2 A flow chart of the second embodiment of the frequency modulation effect evaluation method of the present application is provided.

[0079] In this embodiment, the frequency modulation comprehensive effect evaluation index includes: the device's own impact index; the step S10 also includes steps S101 to S105:

[0080] Step S101: Obtain the frequency modulation control cycle of the wind farm when performing a frequency modulation, the number of wind turbines, the maximum allowable change rate of the pitch angle and the maximum allowable change rate of the speed of each wind turbine in the wind farm, the maximum pitch angle and the minimum pitch angle, and the maximum speed and the minimum speed of each wind turbine in a single cycle.

[0081] It should be understood that the frequency modulation control period may be a time period for a wind farm to perform frequency modulation once; and the number of wind turbines may be the current number of wind turbines in the wind farm.

[0082] Step S102: determining a wind turbine pitch angle change rate index based on the frequency modulation control cycle, the number of wind turbines, the maximum allowable change rate of the pitch angle, the maximum pitch angle value and the minimum pitch angle value.

[0083] It can be understood that the above wind turbine pitch angle change rate index may be an index representing the wind turbine pitch angle change rate when a frequency modulation is performed on a wind farm.

[0084] In this embodiment, the device can first obtain the frequency modulation control period T c , the number of wind turbines I, the number of energy storage battery clusters J, the maximum pitch angle of each wind turbine in a single cycle β max,i and the minimum value β min,i , maximum speed n max,i and minimum speed n min,i , and the real-time state of charge (SOC) of each battery cluster at the end of a single cycle control mea,j , set the maximum allowable change rate V of the pitch angle of each wind turbine β_ref,i and the maximum speed change rate V n_ref,i , then the wind turbine pitch angle change rate index λ can be calculated Vβ , where the wind turbine pitch angle change rate index λ Vβ The calculation formula can be:

[0085] .

[0086] Step S103: determining a speed change rate index based on the frequency modulation control period, the number of wind turbines, the maximum allowable speed change rate, the maximum speed value and the minimum speed value.

[0087] It should be understood that the above speed change rate index may be an index representing the speed change rate of the wind turbine when the wind farm is subjected to a frequency modulation. c , the number of wind turbines I, the maximum allowable rate of change of speed V n_ref,i , maximum speed n max,i and minimum speed n min,i , calculate the speed change rate index λ through the preset calculation formula Vn , where the speed change rate index λ Vn The calculation formula can be:

[0088] .

[0089] Step S104: determining the energy storage charge and discharge depth index based on the number of energy storage battery clusters and the real-time charge state of each battery cluster at the end of a single cycle control.

[0090] It is understandable that the above energy storage charge and discharge depth index can be an index that characterizes the energy storage charge and discharge depth of the wind turbine when the wind farm is subjected to a frequency modulation. In this embodiment, the device can be based on the number of energy storage battery clusters J and the real-time state of charge SOC of each battery cluster at the end of a single cycle control. mea,j , calculate the energy storage charge and discharge depth index λ through the preset formula bess , where the energy storage charge and discharge depth index λ bess The calculation formula can be:

[0091] .

[0092] In actual applications, taking wind farm A as an example, if the total installed capacity of the wind farm is 40MW, the capacity of each unit is 5MW, and the energy storage system configured in the wind farm is a set of 2MW / 2MWh lithium iron phosphate battery energy storage, the capacity of a single battery cluster is 500kWh. When performing a frequency modulation, the number of wind turbines in wind farm A is I=8, the number of energy storage battery clusters is J=4, and the control period for participating in a frequency modulation is T c =3s, the maximum pitch angle of each wind turbine in a certain cycle is β max,i and the minimum value β min,i , maximum speed n max,i and the minimum value n min,i , and the real-time state of charge SOC of each battery cluster at the end of the cycle control mea,j As shown in Table 1 below, set the maximum allowable change rate V of the wind turbine pitch angle β_ref,i =0.5 degrees / second, the maximum allowable rate of change of speed V n_ref,i =5 rpm. According to the above formula, we can calculate: wind turbine pitch angle change rate index λ Vβ =0.87, speed change rate index λVn =0.73, energy storage charge and discharge depth index λ bess =0.35.

[0093] Table 1

[0094]

[0095] Step S105: determining the device self-influence index corresponding to the primary frequency modulation based on the wind turbine pitch angle change rate index, the speed change rate index and the energy storage charge and discharge depth index.

[0096] In this embodiment, the comprehensive frequency regulation effect evaluation index corresponding to the primary frequency regulation is composed of a wind turbine pitch angle change rate index, a speed change rate index and an energy storage charge and discharge depth index. After obtaining these three indicators, the comprehensive frequency regulation effect evaluation index corresponding to the primary frequency regulation of the wind farm can be determined.

[0097] Furthermore, the frequency modulation comprehensive effect evaluation index includes: frequency modulation economic cost index; the step S10 also includes steps S111 to S116:

[0098] Step S111: Determine the annual average pitch angle standby cost, the annual average rotational speed standby cost and the annual average energy storage construction cost of all wind turbines in the wind farm.

[0099] It should be understood that the above-mentioned average annual pitch angle standby cost may be the average standby cost of the pitch angle of all wind turbines in the wind farm within one year; the above-mentioned average annual speed standby cost may be the average standby cost of the speed of all wind turbines in the wind farm within one year; the above-mentioned average annual energy storage construction cost may be the average standby cost of energy storage of all wind turbines in the wind farm within one year.

[0100] Specifically, the step S111 includes:

[0101] Step S111a: Determine the annual average pitch angle standby cost of all wind turbines in the wind farm based on the number of wind turbines in the wind farm, the wind turbine pitch angle standby cost coefficient, the first maximum generateable power and the actual operating power of each wind turbine under current operating conditions, wherein the first maximum generateable power is the maximum generateable power corresponding to the optimal pitch angle when the speed of each wind turbine remains unchanged.

[0102] In this embodiment, in order to determine the frequency regulation economic cost index of the wind farm, the device can first obtain the actual operating power P of each wind turbine under the current working condition. real,i , the first maximum power P corresponding to the optimal pitch angle when the speed remains unchanged β_opt,i The second maximum power P corresponding to the optimal speed when the pitch angle remains unchanged n_opt,i , and the total construction cost of the energy storage system C bess and service life Lbess Then, the spare cost coefficient k can be calculated based on the number of wind turbines in the wind farm I and the wind turbine pitch angle. β,i , the first maximum power P β_opt,i and the actual operating power P of each wind turbine under the current working conditions real,i , the annual average pitch angle reserve cost C of all wind turbines in the wind farm is calculated by the preset formula β,year , where the annual average pitch angle reserve cost C β,year The calculation formula is:

[0103] ;

[0104] In the formula, k β,i represents the pitch angle reserve cost coefficient of wind turbine i, which is related to the grid-connected electricity price P rice and its corresponding annual standby time T standby,β,i related.

[0105] Step S111b: Determine the annual average speed standby cost of all wind turbines in the field based on the number of wind turbines, the wind turbine speed standby cost coefficient, the second maximum power that can be generated and the actual operating power, wherein the second maximum power that can be generated is the maximum power that can be generated corresponding to the optimal speed when the pitch angle of each wind turbine remains unchanged.

[0106] In an embodiment, the standby cost coefficient k can be calculated based on the number of wind turbines I and the wind turbine speed. n,i , the second maximum power P n_opt,i And the actual operating power P real,i Calculate the annual average speed reserve cost C of all fans in the field n,year , where the annual average speed reserve cost C n,year The calculation formula can be:

[0107] ;

[0108] In the formula, k n,i represents the speed reserve cost coefficient of wind turbine i, which is related to the grid-connected electricity price P rice and its corresponding annual standby time T standby,n,i related.

[0109] Step S111c: Determine the average annual construction cost of energy storage for all wind turbines in the field based on the total construction cost of the energy storage system and the service life of the energy storage system.

[0110] In this embodiment, the average annual construction cost of energy storage for all wind turbines is C bess,year The total construction cost of the energy storage system C bess and the service life of the energy storage system L bess The calculation formula can be:

[0111] C bess,year =C bess / L bess .

[0112] In practical applications, if the actual operating power P of each wind turbine in wind farm A under the current working conditions is real,i , the maximum power P corresponding to the optimal pitch angle when the speed remains unchanged β_opt,i , the maximum power P corresponding to the optimal speed when the pitch angle remains unchanged n_opt,i , Pitch angle annual standby time T standby,β,i and speed annual standby time T standby,n,i As shown in Table 2 below, the total construction cost C of a 2MW / 2MWh lithium iron phosphate battery energy storage system is bess = 4.2 million yuan, service life L bess =8 years, the on-grid electricity price of the wind farm is P rice = 0.38 yuan / kWh. According to the above formula, we can get: the annual average pitch angle standby cost of all wind turbines C β,year = 560,000 yuan, annual average speed standby cost C n,year = 499,000 yuan, average annual construction cost of energy storage C bess,year =525,000 yuan.

[0113] Table 2

[0114]

[0115] Step S112: determining the total compensation fee of the wind farm according to the historical frequency regulation data, wherein the total compensation fee is the sum of the maximum assessment penalty fee when the wind farm has frequency regulation abnormalities within a preset time period and the compensation fee obtained by participating in a frequency regulation service.

[0116] In this embodiment, the sum of the maximum assessment penalty fee and the compensation fee that can be obtained by participating in the frequency regulation service in one year when the wind farm has no frequency regulation function or the function input rate is unqualified can be determined based on the historical frequency regulation data. income .

[0117] Step S113: determining a pitch angle standby cost index according to the annual average pitch angle standby cost and the sum of the compensation costs.

[0118] In this embodiment, the wind farm pitch angle reserve cost index ω c_β The annual average pitch angle reserve cost C β,year and the total compensation cost C income The calculation formula can be:

[0119] ω c_β =C β,year / Cincome .

[0120] Step S114: determining a speed reserve cost index according to the sum of the annual average speed reserve cost, energy storage and the compensation fee.

[0121] In this embodiment, the speed standby cost index ω c_n The average annual speed reserve cost C n,year The total cost of energy storage and compensation C income The calculation formula can be:

[0122] ω c_n =C n,year / C income .

[0123] Step S115: Determine the energy storage construction cost index according to the average annual construction cost of the energy storage and the total of the compensation costs.

[0124] In this embodiment, the energy storage construction cost indicator ω c_bess Based on the average annual construction cost of energy storage C bess,year and the total compensation cost C income The calculation formula can be:

[0125] ω c_bess =C bess,year / C income .

[0126] In actual application, according to historical data, the sum of assessment and compensation costs related to frequency regulation of wind farm A in one year is C income = 650,000 yuan, combined with the above formula and the pitch angle reserve cost C β,year , Annual average speed standby cost C n,year and the average annual construction cost of energy storage C bess,year The following can be calculated: Pitch angle standby cost index ω c_β =0.86, speed standby cost index ω c_n =0.77, Energy storage construction cost index ω c_bess =0.81.

[0127] Step S116: Determine the frequency regulation economic cost index corresponding to the primary frequency regulation based on the pitch angle standby cost index, the rotational speed standby cost index and the energy storage construction cost index.

[0128] Furthermore, the frequency modulation comprehensive effect evaluation index includes: frequency modulation dynamic performance index; the step S10 also includes steps S121 to S126:

[0129] Step S121: obtaining the actual response lag time, actual response rise time, actual response adjustment time and actual response steady-state deviation of the wind farm when performing a frequency modulation.

[0130] Step S122: determining a response lag time performance indicator according to the actual response lag time and a preset response lag time threshold.

[0131] It should be understood that the above response lag time performance index may be an index characterizing the performance of the actual response lag time of the wind farm when performing a primary frequency modulation; the above preset response lag time threshold may be the maximum response lag time that the wind farm should not exceed when performing a primary frequency modulation as specified by the local power grid. t_delay It can be based on the actual response lag time t of the wind farm during a frequency regulation. delay_real and preset response delay time threshold t delay_max The calculation formula can be:

[0132] ζ t_delay =t delay_real / t delay_max .

[0133] Step S123: determining a rise time performance index according to the actual response rise time and a preset response rise time threshold.

[0134] It can be understood that the above rise time performance index can be an index characterizing the performance of the actual response rise time of the wind farm when performing a frequency modulation; the above preset response rise time threshold can be the maximum response rise time that the wind farm should not exceed when performing a frequency modulation as specified by the local power grid. t_up It can be based on the actual response rise time t up_real and preset response rise time threshold t up_max The calculation formula can be:

[0135] ζ t_up =t up_real / t up_max .

[0136] Step S124: determining an adjustment time performance indicator according to the actual response adjustment time and a preset adjustment time threshold.

[0137] It can be understood that the above-mentioned adjustment time performance index can be an index characterizing the performance of the actual response adjustment time of the wind farm when performing a frequency modulation; the above-mentioned preset response adjustment time threshold can be the maximum response adjustment time that the wind farm should not exceed when performing a frequency modulation as specified by the local power grid. t_settlingThe time t can be adjusted based on the actual response settling_real and preset response adjustment time threshold t settling_max The calculation formula can be:

[0138] ζ t_settling =t settling_real / t settling_max .

[0139] Step S125: determining a steady-state deviation performance index according to the actual response steady-state deviation and a preset steady-state deviation threshold.

[0140] In this embodiment, the above-mentioned steady-state deviation performance index may be an index characterizing the performance of the actual response steady-state deviation of the wind farm when performing a primary frequency modulation; the above-mentioned preset response steady-state deviation threshold may be the maximum response steady-state deviation that the wind farm should not exceed when performing a primary frequency modulation as specified by the local power grid. In this embodiment, the steady-state deviation performance index ζ D_steady The actual response steady-state deviation D steady_real and preset response steady-state deviation threshold D steady_max The calculation formula can be:

[0141] ζ D_steady =D steady_real / D steady_max .

[0142] Step S126: determining the frequency modulation dynamic performance index corresponding to the primary frequency modulation based on the response lag time performance index, the rise time performance index, the adjustment time performance index and the steady-state deviation performance index.

[0143] In practical applications, if the actual response lag time t of wind farm A participating in a certain primary frequency regulation is delay_real =1s, rise time t up_real =7.5s, adjustment time t settling_real =12s, steady-state deviation D steady_real =300kW, the maximum response delay time t that should not be exceeded in the power grid in this area delay_max =2s, rise time t up_max =9s, adjustment time t settling_max =15s, steady-state deviation D steady_max =1% rated installed capacity = 400kW. According to the above formula, we can calculate: response lag time performance index ζ t_delay =0.50, rise time performance index ζ t_up =0.83, adjustment time performance index ζ t_settling =0.80, steady-state deviation performance index ζ D_steady =0.75.

[0144] In this embodiment, the comprehensive frequency modulation effect evaluation index is disclosed, including: equipment self-influence index, frequency modulation economic cost index and frequency modulation dynamic performance index, wherein, in this embodiment, the equipment self-influence index corresponding to the primary frequency modulation can be determined based on the wind turbine pitch angle change rate index, the speed change rate index and the energy storage charge and discharge depth index; at the same time, the frequency modulation economic cost index corresponding to the primary frequency modulation can be determined based on the pitch angle standby cost index, the speed standby cost index and the energy storage construction cost index; in addition, the frequency modulation dynamic performance index corresponding to the primary frequency modulation can also be determined based on the response lag time performance index, the rise time performance index, the adjustment time performance index and the steady-state deviation performance index, so that the comprehensive effect of the wind-storage combined primary frequency modulation can be comprehensively evaluated from multiple angles, including the impact on the equipment itself, the frequency modulation economic cost and the frequency modulation dynamic performance, and taking into full consideration the pitch angle change rate, the speed change rate and the energy storage charge and discharge depth of the wind turbine during the frequency modulation, the pitch angle standby cost, the speed standby cost and the energy storage construction cost, as well as the response lag time, the rise time, the adjustment time and the steady-state deviation when participating in the primary frequency modulation.

[0145] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be described in detail later. Figure 3 , Figure 3 This is a flow chart of the third embodiment of the frequency modulation effect evaluation method of the present application.

[0146] In this embodiment, step S20 includes:

[0147] Step S201: Determine the first evaluation result influence weight corresponding to the equipment's own influence index, the second evaluation result influence weight corresponding to the frequency modulation economic cost index, and the third evaluation result influence weight corresponding to the frequency modulation dynamic performance index.

[0148] It should be noted that the above-mentioned first evaluation result impact weight can be the impact weight of the equipment's own influence on the frequency modulation effect evaluation result; the above-mentioned second evaluation result impact weight can be the impact weight of the frequency modulation economic cost on the frequency modulation effect evaluation result; the above-mentioned third evaluation result impact weight can be the impact weight of the frequency modulation dynamic performance on the frequency modulation effect evaluation result.

[0149] Specifically, the step S201 includes:

[0150] Step S201a: obtaining a first index value according to the wind turbine pitch angle change rate index, the rotational speed change rate index and the energy storage charge and discharge depth index.

[0151] It should be noted that the first index value λ may be a wind turbine pitch angle change rate index λ Vβ, speed change rate index λ Vn And energy storage charge and discharge depth index λ bess The total value can be calculated as:

[0152] λ=λ Vβ +λ Vn +λ bess .

[0153] Step S201b: obtaining a second indicator value according to the pitch angle standby cost indicator, the rotational speed standby cost indicator and the energy storage construction cost indicator.

[0154] It should be noted that the second index value ω may be a pitch angle standby cost index ω: c_β , speed standby cost index ω c_n and energy storage construction cost indexω c_bess The total value can be calculated as:

[0155] ω=ω c_β +ω c_n +ω c_bess .

[0156] Step S201c: obtaining a third indicator value according to the response lag time performance indicator, the rise time performance indicator, the adjustment time performance indicator and the steady-state deviation performance indicator.

[0157] It should be noted that the third indicator value ζ can be the response lag time performance indicator ζ t_delay , Rise time performance indexζ t_up , Adjustment time performance indexζ t_settling and steady-state deviation performance index ζ D_steady The total value can be calculated as:

[0158] ζ=ζ t_delay +ζ t_up +ζ t_settling +ζ D_steady .

[0159] Step S201d: Determine the first evaluation result influence weight corresponding to the equipment's own influence index, the second evaluation result influence weight corresponding to the frequency modulation economic cost index, and the third evaluation result influence weight corresponding to the frequency modulation dynamic performance index based on the first indicator value, the second indicator value, and the third indicator value.

[0160] In this embodiment, the first evaluation result impact weight K corresponding to the device's own impact index λ , the second evaluation result impact weight K corresponding to the frequency modulation economic cost index ω And the third evaluation result impact weight K corresponding to the frequency modulation dynamic performance indexζ The calculation formulas can be respectively:

[0161] K λ =λ / λ+ω+ζ; K ω =ω / λ+ω+ζ; K ζ =ζ / λ+ω+ζ.

[0162] In practical applications, λ can be calculated based on the above formula Vβ =0.87, λ Vn =0.73,λ bess =0.35,ω c_β =0.86,ω c_n =0.77,ω c_bess =0.81,ζ t_delay =0.50, ζ t_up =0.83,ζ t_settling = 0.80 and ζ D_steady =0.75. Substituting these formulas into the calculation formula of the impact weight of the above evaluation results, we can calculate the weights K of the three aspects of frequency modulation on the equipment itself, frequency modulation economic cost, and frequency modulation dynamic performance on the frequency modulation effect evaluation results. λ =0.27, K ω =0.33, K ζ =0.40.

[0163] Accordingly, the step S30 includes:

[0164] Step S301: Determine the frequency modulation comprehensive effect evaluation function value based on the device's own impact index, the frequency modulation economic cost index, the frequency modulation dynamic performance index, the first evaluation result impact weight, the second evaluation result impact weight and the third evaluation result impact weight.

[0165] In practical applications, 6) considering that the greater the index value of each factor is, the greater the negative impact on the equipment, the higher the cost of frequency regulation, and the worse the dynamic performance of frequency regulation, the risk preference utility function is used to construct the comprehensive effect evaluation function F( ) of wind power storage combined with primary frequency regulation, which is:

[0166] F( )=K λ *f(x λ )+K ω *f(x ω )+K ζ *f(x ζ );

[0167] in:

[0168]

[0169]

[0170]

[0171] Thereafter, the frequency regulation comprehensive effect evaluation function value when the current wind farm performs a frequency regulation can be calculated, and the frequency regulation effect evaluation result corresponding to the frequency regulation can be obtained according to the frequency regulation comprehensive effect evaluation function value.

[0172] In the specific implementation, refer to Figure 4 , Figure 4 This is the overall flow chart of the frequency modulation effect evaluation method of this application. Figure 4 As shown, the frequency modulation control period T can be obtained first. c , the number of wind turbines I, the number of energy storage battery clusters J, the maximum pitch angle of each wind turbine in a single cycle β max,i and the minimum value β min,i , maximum speed n max,i and the minimum value n min,i , and the real-time state of charge (SOC) of each battery cluster at the end of a single cycle control mea,j , set the maximum allowable change rate V of the pitch angle of each wind turbine β_ref,i and the maximum speed change rate V n_ref,i , and then calculate the wind turbine pitch angle change rate index λ Vβ , speed change rate index λ Vn And energy storage charge and discharge depth index λ bess , in order to obtain the equipment's own impact indicators based on these indicators. At the same time, the actual operating power P of each wind turbine under the current working conditions can be obtained real,i , the maximum power P corresponding to the optimal pitch angle when the speed remains unchanged β_opt,i The maximum power P corresponding to the optimal speed when the pitch angle remains unchanged n_opt,i , and the total construction cost of the energy storage system C bess and service life L bess , and calculate the annual average pitch angle reserve cost C of all wind turbines in the field β,year , Annual average speed standby cost C n,year 、The average annual construction cost of energy storage C bess,year Then, based on historical data, the sum of the maximum assessment penalty fee and the compensation fee that can be obtained by participating in a frequency regulation service in a year when the wind farm does not have a frequency regulation function or the function input rate is unqualified can be determined. income , and then calculate the pitch angle reserve cost index ω c_β , speed standby cost index ω c_n 、Energy storage construction cost indexω c_bess , in order to obtain the frequency regulation economic cost index based on these indicators. In addition, the actual response lag time t of the wind farm when participating in the primary frequency regulation can also be obtaineddelay_real , the rise time t up_real , the regulation time t settling_real and the steady-state deviation D steady_real , as well as the maximum response lag time tdelay_max, rise time tup_max, regulation time t that should not exceed the local grid regulations settling_max and the steady-state deviation D steady_max , calculate the response lag time performance index ζ t_delay , the rise time performance index ζ t_up , the regulation time performance index ζ t_settling , the steady-state deviation performance index ζ D_steady , to obtain the frequency modulation dynamic performance index based on these indexes. Then, the weights K λ , K ω , K ζ of the impact of frequency modulation on the equipment itself, the economic cost of frequency modulation, and the frequency modulation dynamic performance on the evaluation result of the frequency modulation effect can be calculated respectively. Combining the proportion weights of the three factors that the greater the negative impact on the equipment, the higher the cost of frequency modulation, and the worse the frequency modulation dynamic performance, a risk-preference utility function is used to construct the comprehensive evaluation function F( ) of the combined frequency modulation of wind and energy storage. For the value of the comprehensive evaluation function F( ) of the wind farm during primary frequency modulation obtained by the final calculation, if 0 ≤ F( ) ≤ 1, it means that the comprehensive effect of the combined primary frequency modulation of wind and energy storage is: excellent; if 1 < F( ) ≤ 2, it means that the comprehensive effect of the combined primary frequency modulation of wind and energy storage is: good; if 2 < F( ) ≤ 3.5, it means that the comprehensive effect of the combined primary frequency modulation of wind and energy storage is: qualified; if F( ) < 0 or F( ) > 3.5, it means that the comprehensive effect of the combined primary frequency modulation of wind and energy storage is: unqualified.

[0173] In this embodiment, the first evaluation result impact weight corresponding to the equipment self-influence index, the second evaluation result impact weight corresponding to the frequency modulation economic cost index, and the third evaluation result impact weight corresponding to the frequency modulation dynamic performance index are disclosed; based on the equipment self-influence index, the frequency modulation economic cost index, the frequency modulation dynamic performance index, the first evaluation result impact weight, the second evaluation result impact weight, and the third evaluation result impact weight, the value of the frequency modulation comprehensive effect evaluation function is determined, so that the primary frequency modulation effect of the wind farm can be evaluated from multiple perspectives of the impact on the equipment itself, the frequency modulation economic cost, and the frequency modulation dynamic performance, and the reliability of the evaluation result is improved.

[0174] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the frequency modulation effect evaluation method of this application. Based on this technical concept, more forms of simple transformation are within the protection scope of this application.

[0175] This application also provides a frequency modulation effect evaluation device, please refer to Figure 5, the frequency modulation effect evaluation device comprises:

[0176] An evaluation index determination module 10 is used to determine a frequency regulation comprehensive effect evaluation index of a wind farm when performing a frequency regulation;

[0177] An impact weight determination module 20 is used to determine the impact weight of the evaluation result corresponding to the frequency modulation comprehensive effect evaluation index;

[0178] A function value determination module 30, configured to determine a frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation index and the evaluation result influence weight;

[0179] The evaluation result acquisition module 40 is used to obtain the frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the frequency modulation comprehensive effect evaluation function value.

[0180] The frequency modulation effect evaluation device provided by the present application adopts the frequency modulation effect evaluation method in the above embodiment, which can solve the technical problem that the frequency modulation effect evaluation method in the prior art only considers the frequency modulation dynamic performance when evaluating the frequency modulation effect, resulting in the inability to fully understand the frequency modulation control method and the frequency modulation effect. Compared with the prior art, the beneficial effects of the frequency modulation effect evaluation device provided by the present application are the same as the beneficial effects of the frequency modulation effect evaluation method provided by the above embodiment, and the other technical features in the frequency modulation effect evaluation device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0181] The present application provides a frequency modulation effect evaluation device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the frequency modulation effect evaluation method in the above-mentioned embodiment one.

[0182] Reference below Figure 6 , which shows a schematic diagram of the structure of a frequency modulation effect evaluation device suitable for implementing the embodiment of the present application. The frequency modulation effect evaluation device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 6 The frequency modulation effect evaluation device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0183] like Figure 6 As shown, the FM effect evaluation device may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the FM effect evaluation device are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the FM effect evaluation device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a FM effect evaluation device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0184] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0185] The frequency modulation effect evaluation device provided by the present application adopts the frequency modulation effect evaluation method in the above embodiment, which can solve the technical problem of frequency modulation effect evaluation. Compared with the prior art, the beneficial effects of the frequency modulation effect evaluation device provided by the present application are the same as the beneficial effects of the frequency modulation effect evaluation method provided by the above embodiment, and other technical features in the frequency modulation effect evaluation device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0186] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0187] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0188] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the frequency modulation effect evaluation method in the above-mentioned embodiment.

[0189] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0190] The computer-readable storage medium may be included in the frequency modulation effect evaluation device; or may exist independently without being assembled into the frequency modulation effect evaluation device.

[0191] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the frequency modulation effect evaluation device, the frequency modulation effect evaluation device: determines the comprehensive frequency modulation effect evaluation index of the wind farm when performing a primary frequency modulation; determines the evaluation result influence weight corresponding to the comprehensive frequency modulation effect evaluation index; determines the comprehensive frequency modulation effect evaluation function value based on the comprehensive frequency modulation effect evaluation index and the evaluation result influence weight; obtains the frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the comprehensive frequency modulation effect evaluation function value.

[0192] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0193] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0194] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0195] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned frequency modulation effect evaluation method, and can solve the technical problem that the frequency modulation effect evaluation method in the prior art only considers the frequency modulation dynamic performance when evaluating the frequency modulation effect, resulting in the inability to fully understand the frequency modulation control method and the frequency modulation effect. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the frequency modulation effect evaluation method provided by the above-mentioned embodiment, and will not be repeated here.

[0196] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for evaluating frequency modulation effect, characterized in that: The method includes: Determine the comprehensive frequency regulation effect evaluation index of the wind farm during the primary frequency regulation; Determine the impact weight of the evaluation result corresponding to the frequency modulation comprehensive effect evaluation index; Determine the frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation index and the evaluation result impact weight; Obtaining a frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the frequency modulation comprehensive effect evaluation function value; The frequency regulation comprehensive effect evaluation index includes: equipment self-influence index; the step of determining the frequency regulation comprehensive effect evaluation index when the wind farm performs a frequency regulation includes: Obtaining the frequency modulation control cycle of the wind farm when performing a frequency modulation, the number of wind turbines, the maximum allowable change rate of the pitch angle and the maximum allowable change rate of the speed of each wind turbine in the wind farm, the maximum value and the minimum value of the pitch angle of each wind turbine in a single cycle, and the maximum speed and the minimum speed; Determine a wind turbine pitch angle change rate index based on the frequency modulation control period, the number of wind turbines, the maximum allowable change rate of the pitch angle, the maximum pitch angle value, and the minimum pitch angle value; Determine a speed change rate index based on the frequency modulation control period, the number of wind turbines, the maximum allowable speed change rate, the maximum speed value and the minimum speed value; Determine the energy storage charge and discharge depth index based on the number of energy storage battery clusters and the real-time charge state of each battery cluster at the end of a single cycle control; The device self-influence index corresponding to the primary frequency modulation is determined based on the wind turbine pitch angle change rate index, the speed change rate index and the energy storage charge and discharge depth index.

2. The method according to claim 1, characterized in that The frequency regulation comprehensive effect evaluation index includes: frequency regulation economic cost index; the step of determining the frequency regulation comprehensive effect evaluation index when the wind farm performs a frequency regulation includes: Determine the average annual pitch angle reserve cost, average annual speed reserve cost and average annual energy storage construction cost of all wind turbines in the wind farm; Determine the total compensation fee for the wind farm based on historical frequency regulation data, where the total compensation fee is the sum of the maximum assessment penalty fee when the wind farm has frequency regulation anomalies within a preset time period and the compensation fee obtained by participating in a frequency regulation service; Determining a pitch angle standby cost index according to the annual average pitch angle standby cost and the sum of the compensation costs; Determine a speed reserve cost index according to the sum of the annual average speed reserve cost, energy storage and the compensation fee; Determine the energy storage construction cost index according to the sum of the average annual construction cost of the energy storage and the compensation fee; The frequency regulation economic cost index corresponding to the primary frequency regulation is determined based on the pitch angle standby cost index, the speed standby cost index and the energy storage construction cost index.

3. The method according to claim 2, characterized in that The step of determining the annual average pitch angle standby cost, the annual average speed standby cost and the annual average construction cost of energy storage for all wind turbines in the wind farm comprises: Determine the annual average pitch angle standby cost of all wind turbines in the wind farm based on the number of wind turbines in the wind farm, the wind turbine pitch angle standby cost coefficient, the first maximum power that can be generated, and the actual operating power of each wind turbine under the current working condition, wherein the first maximum power that can be generated is the maximum power that can be generated corresponding to the optimal pitch angle when the speed of each wind turbine remains unchanged; Determine the annual average speed standby cost of all wind turbines based on the number of wind turbines, the wind turbine speed standby cost coefficient, the second maximum power and the actual operating power, wherein the second maximum power is the maximum power corresponding to the optimal speed when the pitch angle of each wind turbine remains unchanged; The average annual construction cost of energy storage for all wind turbines in the field is determined based on the total construction cost of the energy storage system and the service life of the energy storage system.

4. The method according to claim 2, characterized in that The frequency regulation comprehensive effect evaluation index includes: frequency regulation dynamic performance index; the step of determining the frequency regulation comprehensive effect evaluation index when the wind farm performs a frequency regulation includes: Obtaining the actual response lag time, actual response rise time, actual response adjustment time and actual response steady-state deviation of the wind farm when performing a frequency modulation; Determining a response lag time performance indicator according to the actual response lag time and a preset response lag time threshold; Determine a rise time performance indicator according to the actual response rise time and a preset response rise time threshold; Determine an adjustment time performance indicator according to the actual response adjustment time and a preset adjustment time threshold; Determining a steady-state deviation performance indicator according to the actual response steady-state deviation and a preset steady-state deviation threshold; The frequency modulation dynamic performance index corresponding to the primary frequency modulation is determined based on the response lag time performance index, the rise time performance index, the adjustment time performance index and the steady-state deviation performance index.

5. The method according to claim 4, characterized in that The step of determining the impact weight of the evaluation result corresponding to the frequency modulation comprehensive effect evaluation index comprises: Determine the first evaluation result influence weight corresponding to the equipment's own influence index, the second evaluation result influence weight corresponding to the frequency modulation economic cost index, and the third evaluation result influence weight corresponding to the frequency modulation dynamic performance index; The step of determining the value of the frequency modulation comprehensive effect evaluation function based on the frequency modulation comprehensive effect evaluation index and the evaluation result influence weight comprises: The frequency modulation comprehensive effect evaluation function value is determined based on the equipment's own impact index, the frequency modulation economic cost index, the frequency modulation dynamic performance index, the first evaluation result impact weight, the second evaluation result impact weight and the third evaluation result impact weight.

6. The method according to claim 5, characterized in that The step of determining the first evaluation result influence weight corresponding to the equipment's own influence index, the second evaluation result influence weight corresponding to the frequency modulation economic cost index, and the third evaluation result influence weight corresponding to the frequency modulation dynamic performance index comprises: Acquire a first indicator value according to the wind turbine pitch angle change rate indicator, the speed change rate indicator and the energy storage charge and discharge depth indicator; Acquire a second indicator value according to the pitch angle standby cost indicator, the speed standby cost indicator and the energy storage construction cost indicator; Acquire a third indicator value according to the response lag time performance indicator, the rise time performance indicator, the adjustment time performance indicator and the steady-state deviation performance indicator; Based on the first indicator value, the second indicator value and the third indicator value, determine the first evaluation result influence weight corresponding to the equipment's own influence index, the second evaluation result influence weight corresponding to the frequency modulation economic cost index, and the third evaluation result influence weight corresponding to the frequency modulation dynamic performance index.

7. A frequency modulation effect evaluation device, characterized in that: The device comprises: An evaluation index determination module is used to determine the frequency regulation comprehensive effect evaluation index of the wind farm when performing a frequency regulation; An impact weight determination module is used to determine the impact weight of the evaluation result corresponding to the frequency modulation comprehensive effect evaluation index; A function value determination module, used to determine the frequency modulation comprehensive effect evaluation function value based on the frequency modulation comprehensive effect evaluation index and the evaluation result influence weight; An evaluation result acquisition module, used for acquiring a frequency modulation effect evaluation result corresponding to the primary frequency modulation according to the frequency modulation comprehensive effect evaluation function value; The comprehensive frequency modulation effect evaluation index includes: an equipment self-influence index; the evaluation index determination module is also used to obtain the frequency modulation control cycle, the number of wind turbines, the maximum allowable change rate of the pitch angle of each wind turbine in the wind farm and the maximum allowable change rate of the speed, the maximum pitch angle and the minimum pitch angle of each wind turbine in a single cycle when the wind farm performs a frequency modulation; determine the wind turbine pitch angle change rate index based on the frequency modulation control cycle, the number of wind turbines, the maximum allowable change rate of the pitch angle, the maximum pitch angle and the minimum pitch angle; determine the speed change rate index based on the frequency modulation control cycle, the number of wind turbines, the maximum allowable change rate of the speed, the maximum speed and the minimum speed; determine the energy storage charge and discharge depth index based on the number of energy storage battery clusters and the real-time charge state of each battery cluster at the end of a single cycle control; determine the equipment self-influence index corresponding to the primary frequency modulation based on the wind turbine pitch angle change rate index, the speed change rate index and the energy storage charge and discharge depth index.

8. A frequency modulation effect evaluation device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the frequency modulation effect evaluation method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the frequency modulation effect evaluation method according to any one of claims 1 to 6 are implemented.

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