Simulation Parameter Tuning Method and System of Photovoltaic Power Station in Primary Frequency Regulation Simulation System

Abstract

The present invention relates to a method and system for setting simulation parameters of a photovoltaic power station in a primary frequency regulation simulation system, including: determining the theoretical active power response curve of the connection point of the photovoltaic power station in each specified primary frequency regulation response scenario based on the grid frequency response curve in the scenario; using the measured active power response curve of the connection point of the photovoltaic power station in the scenario and the theoretical active power response curve to determine the optimal value of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to the scenario; and setting the simulation parameter value of the photovoltaic power station in the primary frequency regulation simulation system to the average value of the optimal values of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation systems corresponding to all specified primary frequency regulation response scenarios. The present invention can quickly and effectively obtain relatively accurate simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system, provide data support for guiding the operation mode arrangement of the photovoltaic power station in the power grid to participate in primary frequency regulation, and thus maintain the safe and stable operation of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and particularly to a method and a system for setting simulation parameters of a photovoltaic power station in a primary frequency modulation simulation system. Background Art

[0002] At present, in local areas with a high penetration rate of new energy, the proportion of new energy installed capacity is increasing day by day, far exceeding that of conventional units such as thermal power and hydropower.

[0003] Due to the increase in new energy installed capacity, the power grid in local areas with a high penetration rate of new energy adjusts from using hydropower units as the first frequency modulation power source to jointly participating in primary frequency modulation by hydropower, thermal power, and new energy as the new energy installed capacity increases. However, due to the volatility and instability of new energy output, the primary frequency modulation control deviation of the power grid in local areas with a high penetration rate of new energy will increase, bringing new problems to the operation and dispatching of the system.

[0004] In order to guide the arrangement of the power grid operation mode, it is necessary to use an accurate primary frequency modulation simulation system to simulate the dynamic response of the photovoltaic power station under the power grid frequency fluctuation. The accuracy of the primary frequency modulation simulation system is most affected by the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system. Therefore, it is crucial to optimize the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system;

[0005] At present, no corresponding technology with high applicability has been proposed. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a method for setting simulation parameters of a photovoltaic power station in a primary frequency modulation simulation system. This method can quickly and effectively obtain the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system with relatively high accuracy, providing data support for guiding the operation mode arrangement of the photovoltaic power station participating in primary frequency modulation in the power grid, and thus maintaining the safe and stable operation of the power grid.

[0007] The purpose of the present invention is achieved by the following technical solutions:

[0008] The present invention provides a method for setting simulation parameters of a photovoltaic power station in a primary frequency modulation simulation system, which is improved in that the method includes:

[0009] Obtaining the power grid frequency response curve and the measured active power response curve of the connection point of the photovoltaic power station in each specified primary frequency modulation response scenario;

[0010] Determining the theoretical active power response curve of the connection point of the photovoltaic power station in each specified primary frequency modulation response scenario based on the power grid frequency response curve in each specified primary frequency modulation response scenario;

[0011] Determine the optimal values of the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system corresponding to each specified primary frequency modulation response scenario by using the measured active power response curve and the theoretical active power response curve;

[0012] Set the simulation parameter values of the photovoltaic power station in the primary frequency modulation simulation system to the average value of the optimal values of the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system corresponding to all specified primary frequency modulation response scenarios.

[0013] Preferably, the method for determining the theoretical active power response curve of the connection point of the photovoltaic power station in each specified primary frequency modulation response scenario based on the grid frequency response curve in each specified primary frequency modulation response scenario includes:

[0014] Determine the active power value P d,ref (t) at time t in the theoretical active power response curve of the connection point of the photovoltaic power station in the d-th specified primary frequency modulation response scenario according to the following formula:

[0015]

[0016] where f u is the over-frequency threshold of the primary frequency modulation of the photovoltaic power station, f d is the under-frequency threshold of the primary frequency modulation of the photovoltaic power station, K u is the over-frequency regulation coefficient of the primary frequency modulation of the photovoltaic power station, K d is the under-frequency regulation coefficient of the primary frequency modulation of the photovoltaic power station, f d (t) is the frequency value at time t in the grid frequency response curve in the d-th specified primary frequency modulation response scenario, is the active power dispatch command value assigned to the photovoltaic power station by the grid active power automatic control system in the d-th specified primary frequency modulation response scenario, is in the d-th specified primary frequency modulation response scenario The active power value of the connection point of the photovoltaic power station at the moment, is the initial moment of the d-th specified primary frequency modulation response scenario, d ∈ (1~ψ), and ψ is the number of specified primary frequency modulation response scenarios.

[0017] Preferably, the method for determining the optimal values of the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system corresponding to each specified primary frequency modulation response scenario by using the measured active power response curve and the theoretical active power response curve includes:

[0018] A calculation unit for calculating the theoretical active power regulation amount ΔP of the d-th specified primary frequency modulation response scenario according to the following formula d,ref ,

[0019] Search unit, used to search for the corresponding moments in the measured active power response curve of the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario when and the corresponding moments when

[0020] Acquisition unit, used to acquire that the primary frequency regulation response time constant Tord of the PV power station in the simulation parameters of the PV power station in the primary frequency regulation simulation system is the primary frequency regulation time constant T of the PV power station is and the primary frequency regulation proportionality coefficient K of the PV power station p is δ2%·ΔP d,ref and the active power response curve of the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario;

[0021] Determination unit, used to determine the tuning deviation S of the simulation parameters of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario based on the active power response curve of the grid connection point of the PV power station in the primary frequency regulation simulation system d ;

[0022] Judgment unit, used to if S d > S max , then update the simulation parameters Tord, T and K of the PV power station in the primary frequency regulation simulation system p , and return to step 3, otherwise, use the current values of Tord, T and K p as the optimal values of Tord, T and K in the simulation parameters of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario p ;

[0023] Wherein, is the theoretical measured curve of the active power of the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario the active power value at the moment, is the end moment of the d-th specified primary frequency regulation response scenario, is in the d-th specified primary frequency regulation response scenario the active power value of the grid connection point of the PV power station at the moment, is the initial moment of the d-th specified primary frequency regulation response scenario, d ∈ (1~ψ), ψ is the number of specified primary frequency regulation response scenarios, δ1% is the first adjustment amplitude, δ2% is the second adjustment amplitude, δ1 is any value in the interval [1, 10], δ2 is any value in the interval [85, 90], S max is the maximum allowable value of the tuning deviation of the simulation parameters of the PV power station in the primary frequency regulation simulation system.

[0024] The present invention provides a simulation parameter tuning system for a photovoltaic power station in a primary frequency regulation simulation system. The improvement lies in that the system includes:

[0025] An acquisition module, configured to acquire the grid frequency response curve and the measured active power response curve of the connection point of the photovoltaic power station in each specified primary frequency regulation response scenario;

[0026] A first determination module, configured to determine the theoretical active power response curve of the connection point of the photovoltaic power station in each specified primary frequency regulation response scenario based on the grid frequency response curve in each specified primary frequency regulation response scenario;

[0027] A second determination module, configured to use the measured active power response curve and the theoretical active power response curve to determine the optimal value of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to each specified primary frequency regulation response scenario;

[0028] A tuning module, configured to tune the simulation parameter value of the photovoltaic power station in the primary frequency regulation simulation system to the average value of the optimal values of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to all specified primary frequency regulation response scenarios.

[0029] Preferably, the first determination module is configured to:

[0030] Determine the active power value P d,ref (t) at time t in the theoretical active power response curve of the connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario according to the following formula:

[0031]

[0032] In the formula, f u is the over-frequency threshold of the primary frequency regulation of the photovoltaic power station, f d is the under-frequency threshold of the primary frequency regulation of the photovoltaic power station, K u is the over-frequency regulation coefficient of the primary frequency regulation of the photovoltaic power station, K d is the under-frequency regulation coefficient of the primary frequency regulation of the photovoltaic power station, f d (t) is the frequency value at time t in the grid frequency response curve in the d-th specified primary frequency regulation response scenario, is the active power dispatch instruction value assigned by the grid active power automatic control system to the photovoltaic power station in the d-th specified primary frequency regulation response scenario, is the active power value of the connection point of the photovoltaic power station at time in the d-th specified primary frequency regulation response scenario, is the initial time of the d-th specified primary frequency regulation response scenario, d ∈ (1 to ψ), and ψ is the number of specified primary frequency regulation response scenarios.

[0033] Preferably, the second determination module includes:

[0034] A calculation unit for calculating the theoretical active power regulation amount ΔP of primary frequency modulation for the d-th specified primary frequency modulation response scenario according to the following formula d,ref ,

[0035] A searching unit for searching in the measured active power response curve of the PV power station connection point in the d-th specified primary frequency modulation response scenario for the corresponding moment t1 when d and for the corresponding moment when

[0036] An obtaining unit for obtaining that the primary frequency modulation response time constant Tord of the PV power station in the simulation parameters of the primary frequency modulation simulation system is The primary frequency modulation time constant T of the PV power station is and the primary frequency modulation proportionality coefficient K of the PV power station p is δ2%·ΔP d,ref and the active power response curve of the PV power station connection point in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario;

[0037] A determining unit for determining the tuning deviation S of the simulation parameters of the PV power station in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario based on the active power response curve of the PV power station connection point in the primary frequency modulation simulation system d ;

[0038] A judging unit for, if S d > S max , then update the simulation parameters Tord, T, and K of the PV power station in the primary frequency modulation simulation system p , and return to step 3, otherwise, use the current values of Tord, T, and K p as the optimal values of Tord, T, and K in the simulation parameters of the PV power station in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario; p wherein,

[0039] is the theoretical measured curve of the active power of the PV power station connection point in the d-th specified primary frequency modulation response scenario is the active power value at the moment of the is the end moment of the d-th specified primary frequency modulation response scenario, is in the d-th specified primary frequency modulation response scenario is the active power value of the PV power station connection point at the moment is the initial moment of the d-th specified primary frequency regulation response scenario, where d ∈ (1 to ψ), ψ is the number of specified primary frequency regulation response scenarios, δ1% is the first adjustment amplitude, δ2% is the second adjustment amplitude, δ1 is any value in the range [1, 10], δ2 is any value in the range [85, 90], and S max is the maximum allowable value of the setting deviation of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system.

[0040] Compared with the closest prior art, the beneficial effects of the present invention are as follows:

[0041] The technical solution provided by the present invention is to obtain the grid frequency response curve and the measured active power response curve of the connection point of the photovoltaic power station in each specified primary frequency regulation response scenario; determine the theoretical active power response curve of the connection point of the photovoltaic power station in each specified primary frequency regulation response scenario based on the grid frequency response curve in each specified primary frequency regulation response scenario; use the measured active power response curve and the theoretical active power response curve to determine the optimal value of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to each specified primary frequency regulation response scenario; set the simulation parameter value of the photovoltaic power station in the primary frequency regulation simulation system to the average value of the optimal values of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to all specified primary frequency regulation response scenarios; this solution can quickly and effectively obtain the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system with relatively high accuracy, provide data support for guiding the operation mode arrangement of the photovoltaic power station in the grid to participate in primary frequency regulation, and thus maintain the safe and stable operation of the grid. Description of the Drawings

[0042] Figure 1 is the flowchart of the method for setting the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system;

[0043] Figure 2 is the sectional view of the measured active power response curve of the connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario in the embodiment of the present invention;

[0044] Figure 3 is the comparison diagram of the measured active power response curve of the connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario, the theoretical active power response curve of the connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario, and the active power response curve of the connection point of the photovoltaic power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario in the embodiment of the present invention;

[0045] Figure 4 is the structure diagram of the system for setting the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system. Detailed Embodiments

[0046] The following further elaborates on the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0048] The present invention provides a method for setting simulation parameters of a photovoltaic power station in a primary frequency regulation simulation system, as Figure 1 shown, the method includes:

[0049] Step 101, obtaining the grid frequency response curve and the measured active power response curve of the connection point of the photovoltaic power station in each specified primary frequency regulation response scenario;

[0050] Step 102, determining the theoretical active power response curve of the connection point of the photovoltaic power station in each specified primary frequency regulation response scenario based on the grid frequency response curve in each specified primary frequency regulation response scenario;

[0051] Step 103, using the measured active power response curve and the theoretical active power response curve to determine the optimal value of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to each specified primary frequency regulation response scenario;

[0052] Step 104, setting the simulation parameter value of the photovoltaic power station in the primary frequency regulation simulation system to the average value of the optimal values of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to all specified primary frequency regulation response scenarios.

[0053] In a specific embodiment of the present invention, the accuracy of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system can be further improved as the number of preset specified primary frequency regulation response scenarios increases.

[0054] Specifically, the specified primary frequency regulation response scenario is the primary frequency regulation response scenario of a photovoltaic power station operating under a specified operating condition after the grid is subjected to a specified disturbance frequency disturbance;

[0055] The specified operating conditions include: an operating condition where the active power output by the photovoltaic power station is 70% of the rated active power, an operating condition where the output active power is within the range of 40% to 60% of the rated active power, or an operating condition where the output active power is within the range of 20% to 30% of the rated active power;

[0056] The specified disturbance frequency is any one of M preset disturbance frequencies,

[0057] Among them, M is the preset number of disturbance frequencies.

[0058] In the optimal embodiment of the present invention, it is defaulted that the frequency of the power grid when no primary frequency regulation is required is the rated frequency of the power grid.

[0059] Specifically, the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system include:

[0060] The primary frequency regulation response time constant of the photovoltaic power station, the primary frequency regulation time constant of the photovoltaic power station, and the primary frequency regulation proportionality coefficient of the photovoltaic power station.

[0061] Specifically, the step 102 includes:

[0062] Determine the active power value P d,ref (t) at the moment t in the theoretical active power response curve of the connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario according to the following formula:

[0063]

[0064] In the formula, f u is the over-frequency threshold of the primary frequency regulation of the photovoltaic power station, f d is the under-frequency threshold of the primary frequency regulation of the photovoltaic power station, K u is the over-frequency regulation coefficient of the primary frequency regulation of the photovoltaic power station, K d is the under-frequency regulation coefficient of the primary frequency regulation of the photovoltaic power station, f d (t) is the frequency value at the moment t in the grid frequency response curve in the d-th specified primary frequency regulation response scenario, is the active power dispatch instruction value assigned by the grid active power automatic control system to the photovoltaic power station in the d-th specified primary frequency regulation response scenario, is in the d-th specified primary frequency regulation response scenario The active power value of the connection point of the photovoltaic power station at the moment, is the initial moment of the d-th specified primary frequency regulation response scenario, d ∈ (1~ψ), and ψ is the number of specified primary frequency regulation response scenarios.

[0065] Specifically, the step 102 includes:

[0066] Step 102-1, calculate the theoretical active power regulation amount ΔP d,ref ,

[0067] Step 102-2, find in the measured active power response curve of the connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario The corresponding moment when And The corresponding moment

[0068] Step 102-3: Obtain that the primary frequency regulation response time constant Tord of the photovoltaic power station in the primary frequency regulation simulation system is The primary frequency regulation time constant T of the photovoltaic power station is And the primary frequency regulation proportionality coefficient K of the photovoltaic power station p Is δ2%·ΔP d,ref The active power response curve of the connection point of the photovoltaic power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario at;

[0069] Step 102-4: Determine the setting deviation S of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario based on the active power response curve of the connection point of the photovoltaic power station in the primary frequency regulation simulation system d ;

[0070] Step 102-5: If S d > S max , then update the simulation parameters Tord, T, and K of the photovoltaic power station in the primary frequency regulation simulation system p , and return to Step 3. Otherwise, use the current values of Tord, T, and K p As the optimal values of Tord, T, and K in the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario p ;

[0071] Among them, Is the theoretical measured curve of the active power of the connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario The active power value at the moment, Is the end moment of the d-th specified primary frequency regulation response scenario, Is in the d-th specified primary frequency regulation response scenario The active power value of the connection point of the photovoltaic power station at the moment, Is the initial moment of the d-th specified primary frequency regulation response scenario, d ∈ (1~ψ), ψ is the number of specified primary frequency regulation response scenarios, δ1% is the first adjustment amplitude, δ2% is the second adjustment amplitude, δ1 is any value in the interval [1, 10], and this value does not change with the change of the specified primary frequency regulation response scenario, δ2 is any value in the interval [85, 90], and this value does not change with the change of the specified primary frequency regulation response scenario, S max Is the maximum allowable value of the setting deviation of the simulation parameters of the photovoltaic power station in the primary frequency regulation simulation system, and the recommended range is 2~10%.

[0072] In the optimal embodiment of the present invention, before obtaining the active power response curve described in step 102-3, it is necessary to adjust the operating state of the primary frequency modulation simulation system to be exactly the same as the operating state of the power grid at the moment before the start of the d-th specified primary frequency modulation response scenario.

[0073] In the optimal embodiment of the present invention, the segmented schematic diagram of the measured active power response curve P sc (t) of the grid connection point of the photovoltaic power station in the specified primary frequency modulation response scenario is shown by Figure 2 ; the comparison schematic diagram of the measured active power response curve P sc (t) of the grid connection point of the photovoltaic power station in the specified primary frequency modulation response scenario, the theoretical active power response curve P ref (t) of the grid connection point of the photovoltaic power station in the specified primary frequency modulation response scenario, and the active power response curve P fz (t) of the grid connection point of the photovoltaic power station in the primary frequency modulation simulation system corresponding to the specified primary frequency modulation response scenario is shown by Figure 3 .

[0074] Further, step 102-4 includes:

[0075] Determine S according to the following formula d :

[0076]

[0077] In the above formula, P d,fz (t) is the active power value at time t in the active power response curve of the grid connection point of the photovoltaic power station in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario, P d,sc (t) is the active power value at time t in the measured active power response curve of the grid connection point of the photovoltaic power station in the d-th specified primary frequency modulation response scenario, and Δt is the time interval between moments.

[0078] Further, in step 102-5, updating the simulation parameters Tord, T, and K of the photovoltaic power station in the primary frequency modulation simulation system p , includes:

[0079] Update the simulation parameter Tord of the photovoltaic power station in the primary frequency modulation simulation system according to the following formula:

[0080]

[0081] In the above formula, Δε1 is the preset adjustment value of the response time, is the response time in the measured active power response curve of the grid connection point of the photovoltaic power station in the d-th specified primary frequency modulation response scenario, is the response time in the active power response curve at the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario;

[0082] Update the simulation parameter T of the PV power station in the primary frequency regulation simulation system according to the following formula:

[0083]

[0084] In the above formula, Δε2 is the preset adjustment value of the regulation time, is the regulation time in the measured active power response curve at the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario, is the regulation time in the active power response curve at the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario;

[0085] Update the simulation parameter K of the PV power station in the primary frequency regulation simulation system according to the following formula p :

[0086]

[0087] In the above formula, Δp is the preset adjustment value of the overshoot, is the overshoot in the active power response curve at the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario, is the overshoot in the measured active power response curve at the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario.

[0088] The present invention provides a simulation parameter tuning system for a PV power station in a primary frequency regulation simulation system, as Figure 4 shown, the system includes:

[0089] An acquisition module, configured to acquire the grid frequency response curve and the measured active power response curve at the grid connection point of the PV power station in each specified primary frequency regulation response scenario;

[0090] A first determination module, configured to determine the theoretical active power response curve at the grid connection point of the PV power station in each specified primary frequency regulation response scenario based on the grid frequency response curve in each specified primary frequency regulation response scenario;

[0091] A second determination module, configured to determine the optimal value of the simulation parameter of the PV power station in the primary frequency regulation simulation system corresponding to each specified primary frequency regulation response scenario by using the measured active power response curve and the theoretical active power response curve;

[0092] A setting module, configured to set the simulation parameter values of the photovoltaic power station in the primary frequency modulation simulation system to the average value of the optimal values of the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system corresponding to all specified primary frequency modulation response scenarios.

[0093] Specifically, the specified primary frequency modulation response scenario is the primary frequency modulation response scenario of the photovoltaic power station operating under the specified operating conditions after the power grid is disturbed by the specified disturbance frequency;

[0094] The specified operating conditions include: the operating condition where the active power output by the photovoltaic power station is 70% of the rated active power, the operating condition where the output active power is in the range of 40% to 60% of the rated active power, or the operating condition where the output active power is in the range of 20% to 30% of the rated active power;

[0095] The specified disturbance frequency is any one of the preset M disturbance frequencies,

[0096] where M is the preset number of disturbance frequencies.

[0097] Specifically, the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system include:

[0098] The primary frequency modulation response time constant of the photovoltaic power station, the primary frequency modulation time constant of the photovoltaic power station, and the primary frequency modulation proportionality coefficient of the photovoltaic power station.

[0099] Specifically, the first determination module is configured to:

[0100] Determine the active power value P d,ref (t) at time t in the active power theoretical response curve of the grid connection point of the photovoltaic power station in the d-th specified primary frequency modulation response scenario according to the following formula:

[0101]

[0102] In the formula, f u is the over-frequency threshold of the primary frequency modulation of the photovoltaic power station, f d is the under-frequency threshold of the primary frequency modulation of the photovoltaic power station, K u is the over-frequency regulation coefficient of the primary frequency modulation of the photovoltaic power station, K d is the under-frequency regulation coefficient of the primary frequency modulation of the photovoltaic power station, f d (t) is the frequency value at time t in the grid frequency response curve in the d-th specified primary frequency modulation response scenario, is the active power dispatch command value assigned by the grid active power automatic control system to the photovoltaic power station in the d-th specified primary frequency modulation response scenario, is the active power value of the grid connection point of the photovoltaic power station at time in the d-th specified primary frequency modulation response scenario, is the initial moment of the d-th specified primary frequency regulation response scenario, where d ∈ (1 to ψ), and ψ is the number of specified primary frequency regulation response scenarios.

[0103] Specifically, the second determination module includes:

[0104] A calculation unit for calculating the theoretical active power regulation amount ΔP of the primary frequency regulation in the d-th specified primary frequency regulation response scenario according to the following formula d,ref ,

[0105] A search unit for searching in the measured active power response curve of the grid connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario for the corresponding moment t1 when d and for the corresponding moment when

[0106] An acquisition unit for acquiring that the primary frequency regulation response time constant Tord of the photovoltaic power station in the primary frequency regulation simulation system is The primary frequency regulation time constant T of the photovoltaic power station is and the primary frequency regulation proportionality coefficient K of the photovoltaic power station p is δ2%·ΔP d,ref for the active power response curve of the grid connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario in the primary frequency regulation simulation system;

[0107] A determination unit for determining the tuning deviation S of the simulation parameters of the photovoltaic power station in the d-th specified primary frequency regulation response scenario based on the active power response curve of the grid connection point of the photovoltaic power station in the primary frequency regulation simulation system d ;

[0108] A judgment unit for, if S d > S max , then update the simulation parameters Tord, T, and K of the photovoltaic power station in the primary frequency regulation simulation system p , and return to step 3, otherwise, take the current values of Tord, T, and K p as the optimal values of Tord, T, and K in the simulation parameters of the photovoltaic power station in the d-th specified primary frequency regulation response scenario in the primary frequency regulation simulation system p ;

[0109] wherein, is the theoretical measured curve of the active power of the grid connection point of the photovoltaic power station in the d-th specified primary frequency regulation response scenario is the active power value at the moment is the end moment of the d-th specified primary frequency regulation response scenario, For the active power value at the grid connection point of the PV power station at the moment in the d-th specified primary frequency regulation response scenario where t is the time, is the initial moment of the d-th specified primary frequency regulation response scenario, d ∈ (1~ψ), ψ is the number of specified primary frequency regulation response scenarios, δ1% is the first adjustment amplitude, δ2% is the second adjustment amplitude, δ1 is any value in the range [1, 10], δ2 is any value in the range [85, 90], and S max is the maximum allowable value of the setting deviation of the simulation parameters of the PV power station in the primary frequency regulation simulation system.

[0110] Further, the determining unit is configured to:

[0111] Determine S according to the following formula d :

[0112]

[0113] In the above formula, P d,fz (t) is the active power value at time t in the active power response curve of the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario, and P d,sc (t) is the active power value at time t in the measured active power response curve of the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario, and Δt is the time interval between the times.

[0114] Further, in the judgment unit, the simulation parameters Tord, T, and K of the PV power station in the primary frequency regulation simulation system are updated p , including:

[0115] Update the simulation parameter Tord of the PV power station in the primary frequency regulation simulation system according to the following formula:

[0116]

[0117] In the above formula, Δε1 is the preset adjustment value of the response time, is the response time in the measured active power response curve of the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario, is the response time in the active power response curve of the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario;

[0118] Update the simulation parameter T of the PV power station in the primary frequency regulation simulation system according to the following formula:

[0119]

[0120] In the above formula, Δε2 is the preset adjustment value of the regulation time, is the regulation time in the measured active power response curve of the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario, is the regulation time in the active power response curve of the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario;

[0121] Update the simulation parameter K of the PV power station in the primary frequency regulation simulation system according to the following formula p :

[0122]

[0123] In the above formula, Δp is the preset regulation value of overshoot, is the overshoot in the active power response curve of the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario, is the overshoot in the measured active power response curve of the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario.

[0124] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0125] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0126] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1The functions specified in one or more boxes.

[0127] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide for implementing steps of the functions specified in one Figure 1 One process or more processes and / or boxes Figure 1 The steps of the functions specified in one or more boxes.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. A method for setting simulation parameters of a photovoltaic power station in a primary frequency modulation simulation system, characterized in that, The method includes: Obtaining the grid frequency response curve and the measured active power response curve of the PV power station connection point in each specified primary frequency regulation response scenario; Determining the theoretical active power response curve of the PV power station connection point in each specified primary frequency regulation response scenario based on the grid frequency response curve in each specified primary frequency regulation response scenario; Using the measured active power response curve and the theoretical active power response curve to determine the optimal value of the simulation parameters of the PV power station in the primary frequency regulation simulation system corresponding to each specified primary frequency regulation response scenario; Setting the simulation parameter value of the PV power station in the primary frequency regulation simulation system to the average value of the optimal values of the simulation parameters of the PV power station in the primary frequency regulation simulation systems corresponding to all specified primary frequency regulation response scenarios; The determining the theoretical active power response curve of the PV power station connection point in each specified primary frequency regulation response scenario based on the grid frequency response curve in each specified primary frequency regulation response scenario includes: Determine the active power value \(P_d(t)\) at time \(t\) in the theoretical active power response curve of the PV power plant connection point in the \(d\)-th specified primary frequency regulation response scenario according to the following formula: d,ref (t): Where f u is the over-frequency threshold value of primary frequency regulation of the PV power station, and f d is the under-frequency threshold value of primary frequency regulation of the PV power station. K u is the over-frequency regulation coefficient of primary frequency regulation of the PV power station, and K d is the under-frequency regulation coefficient of primary frequency regulation of the PV power station. f d (t) is the frequency value at time t in the grid frequency response curve in the d-th specified primary frequency regulation response scenario. is the active power dispatch command value assigned to the PV power station by the grid active power automatic control system in the d-th specified primary frequency regulation response scenario. is in the d-th specified primary frequency regulation response scenario The active power value at the grid connection point of the PV power station at time. is the initial time of the d-th specified primary frequency regulation response scenario, d ∈ (1~ψ), and ψ is the number of specified primary frequency regulation response scenarios. The using the measured active power response curve and the theoretical active power response curve to determine the optimal value of the simulation parameters of the PV power station in the primary frequency regulation simulation system corresponding to each specified primary frequency regulation response scenario includes: Step 1: Calculate the primary frequency regulation theoretical active power regulation ΔP of the d-th specified primary frequency response scenario according to the following formula d,ref , Step 2: Search in the measured active power response curve at the grid connection point of the PV power station in the d-th specified primary frequency response scenario for the corresponding moment t1 when d and the corresponding moment when Step 3: Obtain that the primary frequency regulation response time constant Tord of the photovoltaic power station in the primary frequency regulation simulation system is The primary frequency regulation time constant T of the photovoltaic power station is And the primary frequency regulation proportionality coefficient K of the photovoltaic power station p is δ2%·ΔP d,ref The active power response curve of the grid connection point of the photovoltaic power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario when Step 4: Determine the setting deviation S of the simulation parameters of the PV power station in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario based on the active power response curve of the PV power station at the point of common coupling in the primary frequency modulation simulation system d ; Step 5: If S d > S max , update the simulation parameters Tord, T, and K of the PV power station in the frequency modulation simulation system once p , and return to Step 3. Otherwise, use the current values of Tord, T, and K p as the optimal values of Tord, T, and K in the simulation parameters of the PV power station in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario p respectively; Among them, is the theoretical measured curve of the active power at the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario is the active power value at time is the end time of the d-th specified primary frequency regulation response scenario, in the d-th specified primary frequency regulation response scenario is the active power value at the grid connection point of the PV power station at time is the initial time of the d-th specified primary frequency regulation response scenario, d ∈ (1~ψ), ψ is the number of specified primary frequency regulation response scenarios, δ1% is the first adjustment amplitude, δ2% is the second adjustment amplitude, δ1 is any value in the interval [1, 10], δ2 is any value in the interval [85, 90], S max is the maximum allowable value of the setting deviation of the simulation parameters of the PV power station in the primary frequency regulation simulation system.

2. The method according to claim 1, characterized in that, The specified primary frequency regulation response scenario is the primary frequency regulation response scenario of the PV power station operating under the specified operating conditions after the grid is subjected to a specified disturbance frequency disturbance; The specified operating conditions include: the operating condition where the active power output by the PV power station is 70% of the rated active power, the operating condition where the output active power is within the range of 40% to 60% of the rated active power, or the operating condition where the output active power is within the range of 20% to 30% of the rated active power; The specified disturbance frequency is any one of the preset M disturbance frequencies, where M is the preset number of disturbance frequencies.

3. The method according to claim 1, characterized in that The simulation parameters of the PV power station in the primary frequency regulation simulation system include: The primary frequency regulation response time constant of the PV power station, the primary frequency regulation time constant of the PV power station, and the primary frequency regulation proportionality coefficient of the PV power station.

4. The method according to claim 1, characterized in that, The step 4 includes: Determine S according to the following formula d :[[]]END]] In the above formula, P d,fz (t) is the active power value at time t in the active power response curve of the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario, P d,sc (t) is the active power value at time t in the measured active power response curve of the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario, and Δt is the time interval between the times, 5. The method according to claim 4, wherein Updating the simulation parameters Tord, T, and K of the photovoltaic power station in the once-frequency modulation simulation system p , including: Updating the simulation parameter Tord of the PV power station in the primary frequency regulation simulation system according to the following formula: In the above formula, Δε1 is the preset adjustment value of the response time, is the response time in the measured active power response curve of the grid connection point of the photovoltaic power station in the d-th specified primary frequency modulation response scenario, is the response time in the active power response curve of the grid connection point of the photovoltaic power station in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario; Updating the simulation parameter T of the PV power station in the primary frequency regulation simulation system according to the following formula: In the above formula, Δε2 is the preset adjustment value of the adjustment time, is the adjustment time in the measured active power response curve of the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario, is the adjustment time in the active power response curve of the grid connection point of the PV power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario; Update the simulation parameter K of the PV power station in the frequency modulation simulation system once according to the following formula p :[[]]END]] In the above formula, Δp is the preset adjustment value of the overshoot, is the overshoot in the active power response curve of the grid connection point of the PV power station in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario, is the overshoot in the measured active power response curve of the grid connection point of the PV power station in the d-th specified primary frequency modulation response scenario.

6. A simulation parameter tuning system for a photovoltaic power station in a primary frequency modulation simulation system, characterized in that The system includes: An acquisition module, configured to obtain the grid frequency response curve and the measured active power response curve of the PV power station connection point in each specified primary frequency regulation response scenario; A first determination module, configured to determine the theoretical active power response curve of the PV power station connection point in each specified primary frequency regulation response scenario based on the grid frequency response curve in each specified primary frequency regulation response scenario; A second determination module, configured to use the measured active power response curve and the theoretical active power response curve to determine the optimal value of the simulation parameters of the PV power station in the primary frequency regulation simulation system corresponding to each specified primary frequency regulation response scenario; A setting module, configured to set the simulation parameter value of the PV power station in the primary frequency regulation simulation system to the average value of the optimal values of the simulation parameters of the PV power station in the primary frequency regulation simulation systems corresponding to all specified primary frequency regulation response scenarios; The first determination module is configured to: Determine the active power value \(P(t)\) at time \(t\) in the theoretical active power response curve of the PV power station connection point in the \(d\)th specified primary frequency regulation response scenario according to the following formula: d,ref (t): Where, f u is the over-frequency threshold value of the primary frequency regulation of the PV power station, f d is the under-frequency threshold value of the primary frequency regulation of the PV power station, K u is the over-frequency regulation coefficient of the primary frequency regulation of the PV power station, K d is the under-frequency regulation coefficient of the primary frequency regulation of the PV power station, f d (t) is the frequency value at time t in the grid frequency response curve in the d-th specified primary frequency regulation response scenario, is the active power dispatch command value assigned to the PV power station by the grid active power automatic control system in the d-th specified primary frequency regulation response scenario, is in the d-th specified primary frequency regulation response scenario The active power value at the grid connection point of the PV power station at time, is the initial time of the d-th specified primary frequency regulation response scenario, d ∈ (1~ψ), and ψ is the number of specified primary frequency regulation response scenarios; The second determination module includes: A calculation unit for calculating the primary frequency regulation theoretical active power regulation amount ΔP of the d-th specified primary frequency regulation response scenario according to the following formula d,ref , Search unit for finding in the measured active power response curve of the grid connection point of a PV power station in the d-th specified primary frequency regulation response scenario the corresponding moment t1 when d and the corresponding moment when An acquisition unit for acquiring that the primary frequency regulation response time constant Tord of a photovoltaic power station in a primary frequency regulation simulation system is The primary frequency regulation time constant T of the photovoltaic power station is And the primary frequency regulation proportionality coefficient K of the photovoltaic power station p Is δ2%·ΔP d,ref The active power response curve of the grid connection point of the photovoltaic power station in the primary frequency regulation simulation system corresponding to the d-th specified primary frequency regulation response scenario when A determination unit, configured to determine a setting deviation S of simulation parameters of a photovoltaic power station in a primary frequency modulation simulation system corresponding to a d-th specified primary frequency modulation response scenario based on an active power response curve of a point of common coupling of the photovoltaic power station in the primary frequency modulation simulation system d ; A judgment unit, which is used to, if S d > S max , update the simulation parameters Tord, T, and K of the photovoltaic power station in the frequency modulation simulation system once p , and return to step 3. Otherwise, use the current values of Tord, T, and K p as the optimal values of Tord, T, and K in the simulation parameters of the photovoltaic power station in the primary frequency modulation simulation system corresponding to the d-th specified primary frequency modulation response scenario p respectively; Among them, is the theoretical measured curve of the active power at the grid connection point of the PV power station in the d-th specified primary frequency regulation response scenario is the active power value at time is the end time of the d-th specified primary frequency regulation response scenario, in the d-th specified primary frequency regulation response scenario is the active power value at the grid connection point of the PV power station at time is the initial time of the d-th specified primary frequency regulation response scenario, d ∈ (1~ψ), ψ is the number of specified primary frequency regulation response scenarios, δ1% is the first adjustment amplitude, δ2% is the second adjustment amplitude, δ1 is any value in the interval [1, 10], δ2 is any value in the interval [85, 90], S max is the maximum allowable value of the setting deviation of the simulation parameters of the PV power station in the primary frequency regulation simulation system.

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