Coordinated control method, system and equipment for inertia and frequency response of fan and medium

Abstract

The invention provides an inertia and frequency response coordinated control method, system and device of a draught fan and a medium, and the method comprises the steps: when the draught fan starts an inertia response and frequency response function, calculating active power instruction values of the draught fan running in different wind speed regions in the inertia response and frequency response process; judging whether the frequency of the fan is in a stable state or not based on the active power instruction values of the fan running in different wind speed areas in the inertial response and frequency response process; when the frequency of the fan is in a stable state, inertial response is ended, a power instruction value of the fan only during frequency response is calculated, and an operation point of the fan is switched to a position corresponding to the power instruction value; the method can consider the change of the operating point of the fan, realizes the automatic adjustment of the cooperation strategy of the inertial response and frequency response of the fan under different working conditions, improves the inertial response and frequency response effects, and improves the frequency stability of the system.

Description

Technical Field

[0001] The patent application of this invention belongs to the technical field of wind turbine frequency regulation, and specifically relates to a method, system, equipment and medium for coordinated control of inertia and frequency response of a wind turbine. Background Art

[0002] At present, due to the more rapid development of new energy, the isolation of the wind turbine inverter from the prime mover and the power grid has led to an extreme lack of inertia in the power grid in some areas, resulting in reduced system frequency stability. Common solutions include: 1. Through the overspeed-de-load operation of the wind turbine, the wind turbine operating point is changed from the traditional maximum power point tracking mode (MPPT) to overspeed de-load operation through the wind turbine overspeed operation, so that more kinetic energy is stored in the wind turbine for the inertial response of the wind turbine, and the operating point is adjusted to provide margin for the frequency response of the wind turbine; 2. Use pitch angle control to reserve part of the active power margin for the frequency response of the wind turbine; 3. Use energy storage systems such as flywheels and battery packs to provide short-term additional active output when the wind turbine responds to inertia. The above-mentioned types of solutions have the following problems: It is usually considered to directly calculate the inertial response power added value (ΔP inert ) and frequency response additional value (ΔP freq ) is directly added to the power command value obtained by the speed lookup table method (P de-load ) to obtain the power command value of the corresponding frequency change process. However, it does not take into account the movement of the wind turbine operating point on the wind energy utilization coefficient (Cp) curve during the inertial response and frequency response process, which will affect the actual effect of the wind turbine inertial response and frequency response; the above problem can be solved by overspeeding and de-loading the wind turbine to eliminate the impact of the movement of the wind turbine operating point on the wind turbine power output effect during the inertial response process. However, for different wind speeds, the operating point of the wind turbine on the Cp curve is also different. For example Figure 1 As shown in the figure, the fan can only achieve overspeed and load reduction operation at lower wind speeds. As the wind speed increases, the fan usually operates in the constant speed area. In this area, its operating point will be as follows: Figure 2 The Cp curve shown moves from right to left, causing it to lose the advantage of overspeed and load reduction operation (i.e., the fan speed decreases and its corresponding power increases), which will make it impossible to solve the impact of the fan operating point movement on the inertial response effect. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the present invention patent application proposes a method for coordinated control of inertia and frequency response of a fan, comprising:

[0004] When the wind turbine starts the inertial response and frequency response functions, the active power command value of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated;

[0005] Based on the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process, determining whether the frequency of the wind turbine is in a stable state;

[0006] When the frequency of the fan is in a stable state, the inertial response is terminated, the power command value of the fan only in the frequency response is calculated, and the operating point of the fan is switched to a position corresponding to the power command value.

[0007] Preferably, when the wind turbine starts the inertial response and frequency response functions, calculating the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process includes:

[0008] When the wind turbine starts the inertial response and frequency response functions, the associated variable power of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated;

[0009] Calculating the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process according to the associated variable power during the inertial response and frequency response process;

[0010] Among them, the associated variable power includes one or more of the following: an inertial response additional power value, a frequency response additional power value and an operating point power change value; the wind speed area includes: a low wind speed area and a high wind speed area; the low wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is less than the set tip speed ratio value; the high wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is greater than or equal to the tip speed ratio value.

[0011] Preferably, the fan operates in different wind speed areas corresponding to the following judgment process:

[0012] Acquire the frequency change rate of the common coupling point in the wind turbine, the steady-state output power of the wind turbine before inertial response, and the operating power of the wind turbine;

[0013] According to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before inertial response and the operating power of the wind turbine, it is determined whether the wind turbine is operating in a low wind speed area or a high wind speed area.

[0014] Preferably, judging whether the wind turbine is operating in a low wind speed area or a high wind speed area according to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine comprises:

[0015] When the frequency change rate of the common coupling point in the wind turbine is a positive number, and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine in a specified time period is a positive number, the wind turbine operates in a low wind speed area; otherwise, the wind turbine operates in a high wind speed area;

[0016] When the frequency change rate of the common coupling point in the wind fan is a negative number, and the difference between the steady-state output power of the wind fan before the inertial response and the operating power of the wind fan in the time period is a negative number, the wind fan operates in a high wind speed area; otherwise, the wind fan operates in a high wind speed area.

[0017] Preferably, the calculation formula corresponding to the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process is as follows:

[0018] P ref =P de-load +ΔP inertial +ΔP opt-point-move +ΔP freq

[0019] Among them, P ref Indicates the active power command value during inertial response and frequency response; P de-load Indicates the active power command value of the fan real-time speed obtained by table lookup method; ΔP inertial Indicates the additional power command value of the fan during inertial response; ΔP opt-point-move Indicates the power change value of the fan at the operating point during the inertial response process; ΔP freq Indicates the additional power command value of the fan during frequency response.

[0020] Preferably, the associated variable power of the wind turbine operating in different wind speed regions during the calculation of the inertial response and the frequency response includes:

[0021] Calculate the inertial response additional power value of the wind turbine when operating in a high wind speed area and a low wind speed area during the inertial response process;

[0022] Calculate the frequency response additional power value of the wind turbine when it is operating in the high wind speed area and the low wind speed area during the frequency response process;

[0023] The power change value of the operating point of the wind turbine in the high wind speed area during the inertial response process is calculated.

[0024] Preferably, the calculation formula corresponding to the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the inertial response process is as follows:

[0025]

[0026] Among them, ΔPinertial It represents the additional power value of the frequency response of the wind turbine in the high wind speed area and the low wind speed area during the inertial response process; T J represents the inertia time constant; f N Indicates the rated frequency of the fan; Indicates the rate of change of frequency.

[0027] Preferably, the calculation formula corresponding to the additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the frequency response process is as follows:

[0028] ΔP freq =-K freq Δf

[0029] Among them, ΔP freq It indicates the additional power command value of the frequency response of the fan when it is operating in the high wind speed area and the low wind speed area during the frequency response process; K freq It represents the active frequency modulation coefficient; Δf represents the frequency change value of the common coupling point of the wind turbine.

[0030] Preferably, the calculation formula corresponding to the power change value of the operating point of the wind turbine in the high wind speed area during the inertial response process is as follows:

[0031] ΔP opt-point-move =P pre-fault -P de-load

[0032] Among them, ΔP opt-point-move represents the power change value of the wind turbine operating at the high wind speed area during the inertial response process; P pre-fault Represents the steady-state output power of the fan before inertial response; P de-load It indicates the active power command value of the fan real-time speed obtained by table lookup method.

[0033] Preferably, the calculating of the power command value of the fan only in frequency response includes:

[0034] Determining a value of a wind speed determination coefficient of the wind turbine based on the acquired frequency change rate of the common coupling point of the wind turbine;

[0035] Based on the value of the wind speed determination coefficient of the wind turbine, a power command value of the wind turbine only in frequency response is calculated.

[0036] Preferably, the calculation formula corresponding to the power command value of the fan only in frequency response is as follows:

[0037]

[0038] Among them, P obj Indicates the power command value of the fan only when it is in frequency response; Pwind Indicates the operating power of the fan; K vw Indicates wind speed determination coefficient; K preco Indicates the speed variation coefficient; P aim Indicates the target power of the wind turbine during frequency response.

[0039] Preferably, whether the fan starts the inertial response and frequency response functions includes the following judgment process:

[0040] Acquire frequency information of a common coupling point in the fan, and pass the common coupling point frequency information through a filter to obtain a corresponding filtered signal;

[0041] When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the product of the frequency change value and the frequency change rate of the common coupling point is a positive number, the fan starts the inertial response and frequency response functions;

[0042] When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the product of the frequency change value and the frequency change rate of the common coupling point is a negative number, the fan does not start the inertial response and frequency response functions;

[0043] The common coupling point frequency information includes one or more of the following: common coupling point frequency and common coupling point frequency change rate; the filtered signal corresponding to the common coupling point frequency is the common coupling point frequency signal; the filtered signal corresponding to the common coupling point change rate is the common coupling point change rate signal.

[0044] Based on the same inventive concept, the patent application of the present invention also provides an inertia and frequency response coordinated control system for a wind turbine, including:

[0045] Power calculation module: used for calculating the active power command value of the fan running in different wind speed areas during the inertial response and frequency response process when the fan starts the inertial response and frequency response functions;

[0046] A state judgment module: used to judge whether the frequency of the wind turbine is in a stable state based on the active power command value of the wind turbine running in different wind speed areas during the inertial response and frequency response process;

[0047] Operating point switching module: used to end the inertial response when the frequency of the fan is in a stable state, calculate the power command value of the fan only when it is in frequency response, and switch the operating point of the fan to the position corresponding to the power command value.

[0048] Preferably, the power calculation module is specifically used for:

[0049] When the wind turbine starts the inertial response and frequency response functions, the associated variable power of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated;

[0050] Calculating the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process according to the associated variable power during the inertial response and frequency response process;

[0051] Among them, the associated variable power includes one or more of the following: an inertial response additional power value, a frequency response additional power value and an operating point power change value; the wind speed area includes: a low wind speed area and a high wind speed area; the low wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is less than the set tip speed ratio value; the high wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is greater than or equal to the tip speed ratio value.

[0052] Preferably, the power calculation module corresponds to the following judgment process when the wind turbine runs in different wind speed areas:

[0053] Acquire the frequency change rate of the common coupling point in the wind turbine, the steady-state output power of the wind turbine before inertial response, and the operating power of the wind turbine;

[0054] According to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before inertial response and the operating power of the wind turbine, it is determined whether the wind turbine is operating in a low wind speed area or a high wind speed area.

[0055] Preferably, the power calculation module determines whether the wind turbine is operating in a low wind speed area or a high wind speed area according to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine, including:

[0056] When the frequency change rate of the common coupling point in the wind turbine is a positive number, and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine in a specified time period is a positive number, the wind turbine operates in a low wind speed area; otherwise, the wind turbine operates in a high wind speed area;

[0057] When the frequency change rate of the common coupling point in the wind fan is a negative number, and the difference between the steady-state output power of the wind fan before the inertial response and the operating power of the wind fan in the time period is a negative number, the wind fan operates in a high wind speed area; otherwise, the wind fan operates in a high wind speed area.

[0058] Preferably, the calculation formula corresponding to the active power command value of the wind turbine operating in different wind speed areas during the inertial response and frequency response process in the power calculation module is as follows:

[0059] P ref =P de-load +ΔP inertial +ΔP opt-point-move +ΔP freq

[0060] Among them, P ref Indicates the active power command value during inertial response and frequency response; P de-load Indicates the active power command value of the fan real-time speed obtained by table lookup method; ΔP inertial Indicates the additional power command value of the fan during inertial response; ΔP opt-point-move Indicates the power change value of the fan at the operating point during the inertial response process; ΔP freq Indicates the additional power command value of the fan during frequency response.

[0061] Preferably, the power calculation module calculates the associated variable power of the wind turbine operating in different wind speed areas during the inertial response and frequency response process, including:

[0062] Calculate the inertial response additional power value of the wind turbine when operating in a high wind speed area and a low wind speed area during the inertial response process;

[0063] Calculate the frequency response additional power value of the wind turbine when it is operating in the high wind speed area and the low wind speed area during the frequency response process;

[0064] The power change value of the operating point of the wind turbine in the high wind speed area during the inertial response process is calculated.

[0065] Preferably, the calculation formula corresponding to the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the inertial response process in the power calculation module is as follows:

[0066]

[0067] Among them, ΔP inertial It represents the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the inertial response process; T J represents the inertia time constant; f N Indicates the rated frequency of the fan; Indicates the rate of change of frequency.

[0068] Preferably, the calculation formula corresponding to the frequency response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the frequency response process in the power calculation module is as follows:

[0069] ΔP freq =-K freq Δf

[0070] Among them, ΔP freq It indicates the additional power command value of the frequency response of the fan when it is operating in the high wind speed area and the low wind speed area during the frequency response process; K freq It represents the active frequency modulation coefficient; Δf represents the frequency change value of the common coupling point of the wind turbine.

[0071] Preferably, the calculation formula corresponding to the power change value of the operating point of the wind turbine in the high wind speed area during the inertial response process in the power calculation module is as follows:

[0072] ΔP opt-point-move =P pre-fault -P de-load

[0073] Among them, ΔP opt-point-move represents the power change value of the wind turbine operating at the high wind speed area during the inertial response process; P pre-fault Represents the steady-state output power of the fan before inertial response; P de-load It indicates the active power command value of the fan real-time speed obtained by table lookup method.

[0074] Preferably, the operation point switching module calculates the power command value of the fan only in frequency response, including:

[0075] Determining a value of a wind speed determination coefficient of the wind turbine based on the acquired frequency change rate of the common coupling point of the wind turbine;

[0076] Based on the value of the wind speed determination coefficient of the wind turbine, a power command value of the wind turbine only in frequency response is calculated.

[0077] Preferably, the calculation formula corresponding to the power command value of the fan in the operating point switching module only during frequency response is as follows:

[0078]

[0079] Among them, P obj Indicates the power command value of the fan only when it is in frequency response; P wind Indicates the operating power of the fan; K vw represents the wind speed determination coefficient; Indicates the speed variation coefficient; P aim Indicates the target power of the wind turbine during frequency response.

[0080] Preferably, whether the wind turbine in the power calculation module starts the inertial response and frequency response functions includes the following judgment process:

[0081] Acquire frequency information of a common coupling point in the fan, and pass the common coupling point frequency information through a filter to obtain a corresponding filtered signal;

[0082] When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the product of the frequency change value and the frequency change rate of the common coupling point is a positive number, the fan starts the inertial response and frequency response functions;

[0083] When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the product of the frequency change value and the frequency change rate of the common coupling point is a negative number, the fan does not start the inertial response and frequency response functions;

[0084] The common coupling point frequency information includes one or more of the following: common coupling point frequency and common coupling point frequency change rate; the filtered signal corresponding to the common coupling point frequency is the common coupling point frequency signal; the filtered signal corresponding to the common coupling point change rate is the common coupling point change rate signal.

[0085] Based on the same inventive concept, the present patent application also provides a computer device, including: one or more processors;

[0086] A memory for storing one or more programs;

[0087] When the one or more programs are executed by the one or more processors, the above-mentioned method for coordinated control of inertia and frequency response of the wind turbine is implemented.

[0088] Based on the same inventive concept, the patent application of the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed, the inertia and frequency response coordinated control method of the wind turbine as described above is implemented.

[0089] Compared with the closest prior art, the patent application of this invention has the following beneficial effects:

[0090] The patent application of the present invention provides a method, system, device and medium for coordinated control of inertia and frequency response of a wind turbine, including: when the wind turbine starts the inertia response and frequency response function, calculating the active power command value of the wind turbine running in different wind speed areas during the inertia response and frequency response process; judging whether the frequency of the wind turbine is in a stable state based on the active power command value of the wind turbine running in different wind speed areas during the inertia response and frequency response process; when the frequency of the wind turbine is in a stable state, ending the inertia response, calculating the power command value of the wind turbine only during the frequency response, and switching the operating point of the wind turbine to a position corresponding to the power command value; the patent application of the present invention represents the power command value caused by the change of the operating point of the wind turbine during the frequency response process by calculating the active power command value during the inertia response and frequency response process, thereby realizing coordinated control of the wind turbine during the inertia response and frequency response process, which is beneficial to improving its inertia response and frequency response effects, thereby improving the system frequency stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 It is a curve diagram of a fan used in the prior art under overspeed and load reduction operation;

[0092] Figure 2 It is a schematic diagram of the operation of the wind turbine operating point on the wind energy utilization coefficient curve during inertial response of the wind turbine used in the prior art;

[0093] Figure 3 A flow chart of a method for coordinated control of inertia and frequency response of a fan provided in the patent application of the present invention;

[0094] Figure 4 The overall work flow chart of the control strategy of a method for coordinated control of inertia and frequency response of a fan provided in the patent application of the present invention;

[0095] Figure 5 A schematic diagram of a control structure used in a method for coordinated control of inertia and frequency response of a fan provided in the patent application of the present invention;

[0096] Figure 6 A schematic diagram of the frequency change rate signal and frequency change amount when the wind speed is 12m / s and the inertia response of the wind turbine in a coordinated control method of the inertia and frequency response of the wind turbine provided in the patent application of the present invention;

[0097] Figure 7 A schematic diagram of active power variation when the wind turbine inertia responds to wind speed of 12m / s in a coordinated control method of wind turbine inertia and frequency response provided in the patent application of the present invention;

[0098] Figure 8A schematic diagram of the change in rotation speed of a fan when the fan inertia responds to a wind speed of 12 m / s in a coordinated control method of the fan inertia and frequency response provided in the patent application of the present invention;

[0099] Fig. 9 A schematic diagram of the change of the tip speed ratio when the wind speed is 12m / s in the inertia response of the wind turbine in a coordinated control method of the inertia and frequency response of the wind turbine provided in the patent application of the present invention;

[0100] Fig.10 A schematic diagram of the frequency change rate signal and frequency change amount when the wind speed is 8m / s inertial response of a wind turbine in a method for coordinated control of inertia and frequency response of the wind turbine provided in the patent application of the present invention;

[0101] Fig.11 A schematic diagram of active power variation when the wind turbine inertia responds at a wind speed of 8m / s in a method for coordinated control of wind turbine inertia and frequency response provided in the patent application of the present invention;

[0102] Fig.12 A schematic diagram of the change in rotation speed of a fan when the wind speed is 8m / s and the fan inertia responds in a coordinated control method of the fan inertia and frequency response provided in the patent application of the present invention;

[0103] Fig.13 A schematic diagram of the change of the tip speed ratio when the wind speed is 8m / s in the inertia response of the wind turbine in the inertia and frequency response coordinated control method of the wind turbine provided in the patent application of the present invention;

[0104] Fig.14 A schematic diagram of the structural composition of an inertia and frequency response coordinated control system for a fan provided in the patent application of the present invention. DETAILED DESCRIPTION

[0105] The specific implementation methods of the patent application of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0106] Embodiment 1:

[0107] The patent application of this invention provides a method for coordinated control of inertia and frequency response of a fan, and the flow chart is as follows: Figure 3 As shown, including:

[0108] Step 1: When the wind turbine starts the inertial response and frequency response functions, the active power command value of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated;

[0109] Step 2: judging whether the frequency of the wind turbine is in a stable state based on the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process;

[0110] Step 3: When the frequency of the fan is in a stable state, end the inertial response, calculate the power command value of the fan only when the frequency response is in progress, and switch the operating point of the fan to a position corresponding to the power command value.

[0111] Specifically, step 1 includes:

[0112] When the wind turbine starts the inertial response and frequency response functions, the associated variable power of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated;

[0113] Calculating the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process according to the associated variable power during the inertial response and frequency response process;

[0114] Among them, the associated variable power includes one or more of the following: an inertial response additional power value, a frequency response additional power value and an operating point power change value; the wind speed area includes: a low wind speed area and a high wind speed area; the low wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is less than the set tip speed ratio value; the high wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is greater than or equal to the tip speed ratio value.

[0115] Whether the fan starts the inertial response and frequency response function includes the following judgment process:

[0116] Acquire frequency information of a common coupling point in the fan, and pass the common coupling point frequency information through a filter to obtain a corresponding filtered signal;

[0117] When the filter signal corresponding to the frequency information of the common coupling point exceeds the dead zone setting value, and the frequency change value Δf and the frequency change rate of the common coupling point are When the product of is a positive number, the fan starts the inertial response and frequency response functions;

[0118] When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the frequency change value Δf and the frequency change rate of the common coupling point are When the product of is a negative number, the fan does not start the inertial response and frequency response functions;

[0119] The common coupling point frequency information includes one or more of the following: common coupling point frequency and common coupling point frequency change rate; the filter signal corresponding to the common coupling point frequency is the common coupling point frequency signal; the filter signal corresponding to the common coupling point change rate is the common coupling point change rate signal;

[0120] The patent application of the present invention uses a phase-locked loop (PLL) to detect the real-time frequency and frequency change rate of the common coupling point (PCC) in the fan, and obtains the frequency signal f and the frequency change rate signal ROCOF after processing by a first-order filter. If the frequency signal f exceeds the dead zone setting value, and Then an enable signal is issued to start the inertial response and frequency response functions. If only f exceeds the dead zone, but The fan inertia response and frequency response functions are stopped.

[0121] The calculation formula corresponding to the active power command value of the wind turbine operating in different wind speed areas during the inertial response and frequency response process is as follows:

[0122] P ref =P de-load +ΔP inertial +ΔP opt-point-move +ΔP freq

[0123] Among them, P ref Indicates the active power command value during inertial response and frequency response; P de-load Indicates the active power command value of the fan real-time speed obtained by table lookup method; ΔP inertial Indicates the additional power command value of the fan during inertial response; ΔP opt-point-move Indicates the power change value of the fan at the operating point during the inertial response process; ΔP freq Indicates the additional power command value of the fan during frequency response.

[0124] The associated variable power of the wind turbine operating in different wind speed regions during the calculation of the inertial response and the frequency response includes:

[0125] Calculate the inertial response additional power value of the wind turbine when operating in a high wind speed area and a low wind speed area during the inertial response process;

[0126] Calculate the frequency response additional power value of the wind turbine when it is operating in the high wind speed area and the low wind speed area during the frequency response process;

[0127] The power change value of the operating point of the wind turbine in the high wind speed area during the inertial response process is calculated.

[0128] During the inertial response process, the calculation formula corresponding to the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area is as follows:

[0129]

[0130] Among them, ΔP inertial It represents the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the inertial response process; TJ represents the inertia time constant; f N Indicates the rated frequency of the fan; Indicates the frequency change rate; the additional power required for inertial response is related to the frequency change rate. The larger the frequency change rate at the PCC point, the more additional active power (ΔP inertial ) is larger.

[0131] The calculation formula corresponding to the frequency response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the frequency response process is as follows:

[0132] ΔP freq =-K freq Δf

[0133] Among them, ΔP freq It indicates the additional power command value of the frequency response of the fan when it is operating in the high wind speed area and the low wind speed area during the frequency response process; K freq represents the active frequency modulation coefficient; Δf represents the frequency change value of the common coupling point of the wind turbine; the additional active power required for frequency response is related to the frequency change, and preferably, its upper limit is set to 2% of the currently available power.

[0134] When the first step inertial response enable signal is received, the wind turbine output power P at the previous moment is stored. pre-fault , which is the active power value corresponding to the fan speed before response;

[0135] The fan running in different wind speed areas corresponds to the following judgment process:

[0136] Obtain the frequency change rate of the common coupling point in the fan The steady-state output power P of the fan before inertial response pre-fault and the operating power P of the fan wind ;

[0137] According to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before inertial response and the operating power of the wind turbine, it is determined whether the wind turbine is operating in a low wind speed area or a high wind speed area.

[0138] The determining whether the wind turbine is operating in a low wind speed area or a high wind speed area according to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine comprises:

[0139] When the frequency change rate of the common coupling point in the fan is positive, And the difference between the steady-state output power of the fan before the inertial response and the operating power of the fan in the specified time period t is a positive number, which satisfies (P pre-fault -Pwind )>0, the fan operates in the low wind speed area; otherwise, the fan operates in the high wind speed area;

[0140] When the frequency change rate of the common coupling point in the fan is negative, that is, And the difference between the steady-state output power of the fan before the inertial response and the operating power of the fan in the time period t is a negative number, which satisfies (P pre-fault -P wind )<0, the fan operates in the high wind speed area; otherwise, the fan operates in the high wind speed area;

[0141] If it is determined to be a low wind speed, the change in the operating point of the wind turbine during the response process is beneficial to the change in its output power, and no compensation is made for the movement of the operating point.

[0142] If it is determined to be a high wind speed, the change in the working point of the fan during the response process will be detrimental to its inertial response effect. The fan working point movement compensation is calculated according to the following formula, that is, the calculation formula corresponding to the operating point power change value of the fan in the high wind speed area during the inertial response process is as follows:

[0143] ΔP opt-point-move =P pre-fault -P de-load

[0144] Among them, ΔP opt-point-move represents the power change value of the wind turbine operating at the high wind speed area during the inertial response process; P pre-fault Represents the steady-state output power of the fan before inertial response; P de-load Indicates the active power command value of the fan real-time speed obtained by table lookup method;

[0145] The step 3 of calculating the power command value of the fan only in frequency response includes:

[0146] Determining a value of a wind speed determination coefficient of the wind turbine based on the acquired frequency change rate of the common coupling point of the wind turbine;

[0147] Calculating the power command value of the fan only in frequency response based on the value of the wind speed determination coefficient of the fan;

[0148] If When the frequency is determined to be stable at a new value, the inertial response is terminated, and the frequency response function is started only by increasing the speed, so that the fan is stabilized at a new working point and outputs additional active power for a long time, that is, the output power is first reduced for a short time, and as the fan speed increases, its working point will move to a new position to realize the frequency response function; the active power reference value of the fan is calculated using the following calculation formula:

[0149] P ref1=P de-load -ΔP reco

[0150] Among them, P ref1 Indicates the active power reference value of the fan; P de-load Indicates the active power command value of the fan real-time speed obtained by table lookup method; ΔP reco Indicates that the fan output needs to be reduced;

[0151] According to the required output of the fan, the fan output power can be reduced, and the fan speed can be increased. As the fan output power gradually approaches the power required by the frequency response, and the speed gradually approaches the speed corresponding to the operating point of the frequency response, ΔP reco Gradually approaching 0, it can be achieved according to the following formula:

[0152] P aim =P pre-fault +P freq

[0153]

[0154] Among them, P aim Indicates the target power required for frequency response; P pre-fault Represents the steady-state output power of the fan before inertial response; P freq Indicates the additional power command value of the fan during frequency response; ΔP reco Indicates that the fan output needs to be reduced; Indicates the speed variation coefficient; P wind Indicates the operating power of the fan.

[0155] The present invention patent application introduces the wind speed determination coefficient K vw , if the fan operates in a high wind speed area, then K vw =1; if it is determined that the fan is running in the low wind speed area, then K vw =-1. This coefficient can unify the coordinated control of the inertial response and frequency response of the fan at all wind speeds. At this time, the power command value is calculated as follows:

[0156] P obj =P wind -K vw ΔP reco

[0157] Among them, P obj Indicates the power command value of the fan only when it is in frequency response; ΔP reco Indicates the output of the fan that needs to be reduced; P wind Indicates the operating power of the fan; K vw represents the wind speed determination coefficient;

[0158] Substitute ΔP reco The power command value P of the fan only in frequency response can be obtained by using the expression obj The corresponding expansion is as follows:

[0159]

[0160] Among them, P obj Indicates the power command value of the fan only when it is in frequency response; P wind Indicates the operating power of the fan; K vw Indicates wind speed determination coefficient; K preco Indicates the speed variation coefficient; P aim Indicates the target power of the wind turbine during frequency response.

[0161] The patent application of the present invention provides a method for coordinated control of the inertia and frequency response of a fan, which adopts a coordinated control strategy of the inertia response and frequency response of the fan without the need for additional energy storage and taking into account the change of the fan operating point. The overall workflow diagram is as follows: Figure 4 As shown, when the control strategy is started, the associated change power value of the wind turbine during the inertial response and frequency response process is used to obtain the active power command value of the wind turbine operating in different wind speed areas. Combined with the wind speed determination coefficient, the power specified value of the wind turbine only during frequency response is obtained, and finally the position corresponding to the power specified value of the wind turbine operating point is moved. This application coordinates the inertial response and frequency response of the wind turbine without additional energy storage in the entire wind speed range and taking into account the change of the wind turbine operating point. Under the premise of no reserved pitch angle reserve active power and external energy storage device, the wind turbine operates based on the overspeed load reduction curve. During inertial response, the kinetic energy of the wind turbine is released to provide rapid active support for the system and limit the frequency change rate. When the frequency change stops and stabilizes at a new frequency, it automatically switches to the frequency response mode, and changes its operating point position through the change of the wind turbine output power, so as to provide long-term frequency support for the system and thereby improve the system frequency stability.

[0162] Embodiment 2:

[0163] A specific example is used to illustrate the accuracy of the coordinated control process of the inertia response and frequency response of a fan provided by the patent application of the present invention. The following example is built in DigSILENT: Figure 5 The system shown in the figure was tested under high wind speed (12m / s) and low wind speed (8m / s) conditions respectively;

[0164] When the wind speed is 12m / s, the steady-state output power of the fan is measured to be 0.682pu. Figure 6As shown, at 20 seconds, the frequency drops to 47Hz at a speed of 2.5Hz / s. The fan frequency response additional power limit is 2%. The maximum power can be obtained at present. The fan active output and speed change are as follows Figure 7-Figure 8 As shown in the figure, it can be seen that when the frequency changes according to the above conditions, it can be calculated that the fan active output command value should be 1.398pu, but due to the upper limit of the fan output, the simulation result is 1pu. At 21.2s, the frequency drops to 47pu and stabilizes at this value. At this time, the inertial response power addition value becomes 0, and the final fan output power is calculated to be 0.6983, which is the same as the simulation result. Fig. 9 As shown in the figure, through the speed and tip speed ratio, it can be seen that the fan first reduces the speed to release kinetic energy and increase the active output. Then, when the frequency change rate of the fan After it becomes 0, the fan only responds to the frequency change, increases the speed, and stabilizes at the new operating point;

[0165] Under the condition of wind speed of 8m / s and steady-state output power of the fan of 0.2441pu, Fig.10 As shown, at 20 seconds, the frequency drops to 47Hz at a speed of 2.5Hz / s. The fan frequency response additional power limit is 2%. The maximum power can be obtained at present. The fan active output and speed change are as follows Figure 11-Figure 12 As shown in the figure, when the wind speed is low and the frequency changes according to the above conditions, it can be calculated that the wind turbine active output command value should be 0.9491pu (where ΔP inertial =0.7, ΔP freq =0.005, P de-load +ΔP opt-point-move =0.2241pu), which is close to the simulation result; at 21.2s, the frequency drops to 47pu and stabilizes at this value. At this time, the inertial response power addition value becomes 0. It can be calculated that the final fan output power should be 0.2491, which is similar to the simulation result. Fig.13 As shown in the figure, through the speed and tip speed ratio, it can be seen that the fan first reduces the speed to release kinetic energy and increase the active output, and then, when After it becomes 0, the fan only responds to the frequency change, increases the speed, and stabilizes at the new operating point.

[0166] The above simulation results show that the inertia and frequency response coordinated control method of the wind turbine provided in the patent application of the present invention can realize that when the frequency changes, without reserving the pitch angle to reserve active power and external energy storage device, the wind turbine can automatically adjust the coordination strategy according to different wind speed areas to achieve the coordination of inertial response and frequency response in the full wind speed range. In addition, the present application also fully considers the offset of the operating point during the response of the wind turbine, ensures the effect of the inertial response, and the time for the frequency response to be fully realized can be adjusted by adjusting the speed change coefficient according to different grid connection requirements and grid strength, thereby improving the feasibility of the application of the control strategy in different grids.

[0167] Embodiment 3:

[0168] Based on the same inventive concept, the patent application of the present invention also provides an inertia and frequency response coordinated control system for a wind turbine.

[0169] The system structure is as follows Fig.14 As shown, including:

[0170] Power calculation module: used for calculating the active power command value of the fan running in different wind speed areas during the inertial response and frequency response process when the fan starts the inertial response and frequency response functions;

[0171] A state judgment module: used to judge whether the frequency of the wind turbine is in a stable state based on the active power command value of the wind turbine running in different wind speed areas during the inertial response and frequency response process;

[0172] Operating point switching module: used to end the inertial response when the frequency of the fan is in a stable state, calculate the power command value of the fan only when it is in frequency response, and switch the operating point of the fan to the position corresponding to the power command value.

[0173] The power calculation module is specifically used for:

[0174] When the wind turbine starts the inertial response and frequency response functions, the associated variable power of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated;

[0175] Calculating the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process according to the associated variable power during the inertial response and frequency response process;

[0176] Among them, the associated variable power includes one or more of the following: an inertial response additional power value, a frequency response additional power value and an operating point power change value; the wind speed area includes: a low wind speed area and a high wind speed area; the low wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is less than the set tip speed ratio value; the high wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is greater than or equal to the tip speed ratio value.

[0177] Whether the wind turbine starts the inertial response and frequency response functions in the power calculation module includes the following judgment process:

[0178] Acquire frequency information of a common coupling point in the fan, and pass the common coupling point frequency information through a filter to obtain a corresponding filtered signal;

[0179] When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the product of the frequency change value and the frequency change rate of the common coupling point is a positive number, the fan starts the inertial response and frequency response functions;

[0180] When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the product of the frequency change value and the frequency change rate of the common coupling point is a negative number, the fan does not start the inertial response and frequency response functions;

[0181] The common coupling point frequency information includes one or more of the following: common coupling point frequency and common coupling point frequency change rate; the filtered signal corresponding to the common coupling point frequency is the common coupling point frequency signal; the filtered signal corresponding to the common coupling point change rate is the common coupling point change rate signal.

[0182] The power calculation module corresponds to the following judgment process when the wind turbine runs in different wind speed areas:

[0183] Acquire the frequency change rate of the common coupling point in the wind turbine, the steady-state output power of the wind turbine before inertial response, and the operating power of the wind turbine;

[0184] According to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before inertial response and the operating power of the wind turbine, it is determined whether the wind turbine is operating in a low wind speed area or a high wind speed area.

[0185] The power calculation module determines whether the wind turbine is operating in a low wind speed area or a high wind speed area according to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine, including:

[0186] When the frequency change rate of the common coupling point in the wind turbine is a positive number, and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine in a specified time period is a positive number, the wind turbine operates in a low wind speed area; otherwise, the wind turbine operates in a high wind speed area;

[0187] When the frequency change rate of the common coupling point in the wind fan is a negative number, and the difference between the steady-state output power of the wind fan before the inertial response and the operating power of the wind fan in the time period is a negative number, the wind fan operates in a high wind speed area; otherwise, the wind fan operates in a high wind speed area.

[0188] The calculation formula corresponding to the active power command value of the wind turbine operating in different wind speed areas during the inertial response and frequency response process in the power calculation module is as follows:

[0189] P ref =P de-load +ΔP inertial +ΔP opt-point-move +ΔP freq

[0190] Among them, P ref Indicates the active power command value during inertial response and frequency response; P de-load Indicates the active power command value of the fan real-time speed obtained by table lookup method; ΔP inertial Indicates the additional power command value of the fan during inertial response; ΔP opt-point-move Indicates the power change value of the fan at the operating point during the inertial response process; ΔP freq Indicates the additional power command value of the fan during frequency response.

[0191] The power calculation module calculates the associated variable power of the wind turbine operating in different wind speed areas during the inertial response and frequency response process, including:

[0192] Calculate the inertial response additional power value of the wind turbine when operating in a high wind speed area and a low wind speed area during the inertial response process;

[0193] Calculate the frequency response additional power value of the wind turbine when it is operating in the high wind speed area and the low wind speed area during the frequency response process;

[0194] The power change value of the operating point of the wind turbine in the high wind speed area during the inertial response process is calculated.

[0195] During the inertial response process in the power calculation module, the calculation formula corresponding to the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area is as follows:

[0196]

[0197] Among them, ΔP inertial It represents the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the inertial response process; T J represents the inertia time constant; f N Indicates the rated frequency of the fan; Indicates the rate of change of frequency.

[0198] Preferably, the calculation formula corresponding to the frequency response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the frequency response process in the power calculation module is as follows:

[0199] ΔP freq =-K frq Δf

[0200] Among them, ΔP freq It indicates the additional power command value of the frequency response of the fan when it is operating in the high wind speed area and the low wind speed area during the frequency response process; K freq It represents the active frequency modulation coefficient; Δf represents the frequency change value of the common coupling point of the wind turbine.

[0201] The calculation formula corresponding to the power change value of the operating point of the wind turbine in the high wind speed area during the inertial response process in the power calculation module is as follows:

[0202] ΔP opt-point-move =P pre-fault -P de-load

[0203] Among them, ΔP opt-point-move represents the power change value of the wind turbine operating at the high wind speed area during the inertial response process; P pre-fault Represents the steady-state output power of the fan before inertial response; P de-load It indicates the active power command value of the fan real-time speed obtained by table lookup method.

[0204] The operation point switching module calculates the power command value of the fan only when the fan is in frequency response, including:

[0205] Determining a value of a wind speed determination coefficient of the wind turbine based on the acquired frequency change rate of the common coupling point of the wind turbine;

[0206] Based on the value of the wind speed determination coefficient of the wind turbine, a power command value of the wind turbine only in frequency response is calculated.

[0207] Preferably, the calculation formula corresponding to the power command value of the fan in the operating point switching module only during frequency response is as follows:

[0208]

[0209] Among them, P obj Indicates the power command value of the fan only when it is in frequency response; P wind Indicates the operating power of the fan; K vw represents the wind speed determination coefficient; Indicates the speed variation coefficient; P aim Indicates the target power of the wind turbine during frequency response.

[0210] Embodiment 4:

[0211] Based on the same inventive concept, the patent application of the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the inertia and frequency response coordinated control method of a wind turbine in the above embodiment.

[0212] Embodiment 5:

[0213] Based on the same inventive concept, the patent application of the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a method for coordinated control of inertia and frequency response of a wind turbine in the above-mentioned embodiment.

[0214] It should be understood by those skilled in the art that the embodiments of the present invention patent application can be provided as methods, systems, or computer program products. Therefore, the present invention patent application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention patent application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0215] The present invention patent application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention patent application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0216] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0217] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0218] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the patent application of the present invention rather than to limit its protection scope. Although the patent application of the present invention is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the patent application of the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A method for coordinated control of inertia and frequency response of a fan, characterized in that: include: When the wind turbine starts the inertial response and frequency response functions, the active power command value of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated; Based on the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process, determining whether the frequency of the wind turbine is in a stable state; When the frequency of the fan is in a stable state, the inertial response is terminated, the power command value of the fan only in the frequency response is calculated, and the operating point of the fan is switched to a position corresponding to the power command value.

2. The method according to claim 1, characterized in that When the wind turbine starts the inertial response and frequency response functions, the active power command value of the wind turbine running in different wind speed areas during the inertial response and frequency response process is calculated, including: When the wind turbine starts the inertial response and frequency response functions, the associated variable power of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated; Calculating the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process according to the associated variable power during the inertial response and frequency response process; Among them, the associated variable power includes one or more of the following: an inertial response additional power value, a frequency response additional power value and an operating point power change value; the wind speed area includes: a low wind speed area and a high wind speed area; the low wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is less than the set tip speed ratio value; the high wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is greater than or equal to the tip speed ratio value.

3. The method according to claim 2, characterized in that The fan running in different wind speed areas corresponds to the following judgment process: Acquire the frequency change rate of the common coupling point in the wind turbine, the steady-state output power of the wind turbine before inertial response, and the operating power of the wind turbine; According to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before inertial response and the operating power of the wind turbine, it is determined whether the wind turbine is operating in a low wind speed area or a high wind speed area.

4. The method according to claim 3, characterized in that The determining whether the wind turbine is operating in a low wind speed area or a high wind speed area according to the frequency change rate of the common coupling point in the wind turbine and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine comprises: When the frequency change rate of the common coupling point in the wind turbine is a positive number, and the difference between the steady-state output power of the wind turbine before the inertial response and the operating power of the wind turbine in a specified time period is a positive number, the wind turbine operates in a low wind speed area; otherwise, the wind turbine operates in a high wind speed area; When the frequency change rate of the common coupling point in the wind fan is a negative number, and the difference between the steady-state output power of the wind fan before the inertial response and the operating power of the wind fan in the time period is a negative number, the wind fan operates in a high wind speed area; otherwise, the wind fan operates in a high wind speed area.

5. The method according to claim 2, characterized in that The calculation formula corresponding to the active power command value of the wind turbine operating in different wind speed areas during the inertial response and frequency response process is as follows: P ref =P de-load +ΔP inertial +ΔP opt-point-move +ΔP freq Among them, P ref Indicates the active power command value during inertial response and frequency response; P de-load Indicates the active power command value of the fan real-time speed obtained by table lookup method; ΔP inertial Indicates the additional power command value of the fan during inertial response; ΔP opt-point-move Indicates the power change value of the fan at the operating point during the inertial response process; ΔP freq Indicates the additional power command value of the fan during frequency response.

6. The method according to claim 2, characterized in that The associated variable power of the wind turbine operating in different wind speed regions during the calculation of the inertial response and the frequency response includes: Calculate the inertial response additional power value of the wind turbine when operating in a high wind speed area and a low wind speed area during the inertial response process; Calculate the frequency response additional power value of the wind turbine when it is operating in the high wind speed area and the low wind speed area during the frequency response process; The power change value of the operating point of the wind turbine in the high wind speed area during the inertial response process is calculated.

7. The method according to claim 6, characterized in that During the inertial response process, the calculation formula corresponding to the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area is as follows: Among them, ΔP inertial It represents the inertial response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the inertial response process; T J represents the inertia time constant; f N Indicates the rated frequency of the fan; Indicates the rate of change of frequency.

8. The method according to claim 6, characterized in that The calculation formula corresponding to the frequency response additional power value of the wind turbine operating in the high wind speed area and the low wind speed area during the frequency response process is as follows: ΔP freq =-K frq ·Δf Among them, ΔP freq It indicates the additional power command value of the frequency response of the fan when it is operating in the high wind speed area and the low wind speed area during the frequency response process; K freq It represents the active frequency modulation coefficient; Δf represents the frequency change value of the common coupling point of the wind turbine.

9. The method according to claim 6, characterized in that The calculation formula corresponding to the power change value of the wind turbine operating at the high wind speed area during the inertial response process is as follows: ΔP opt-point-move =P pre-fault -P de-load Among them, ΔP opt-point-move represents the power change value of the wind turbine operating at the high wind speed area during the inertial response process; P pre-fault Represents the steady-state output power of the fan before inertial response; P de-load It indicates the active power command value of the fan real-time speed obtained by table lookup method.

10. The method according to claim 1, characterized in that The calculating of the power command value of the fan only in frequency response includes: Determining a value of a wind speed determination coefficient of the wind turbine based on the acquired frequency change rate of the common coupling point of the wind turbine; Based on the value of the wind speed determination coefficient of the wind turbine, a power command value of the wind turbine only in frequency response is calculated.

11. The method according to claim 10, characterized in that The calculation formula corresponding to the power command value of the fan only in frequency response is as follows: P obj =P wind -K vw K preco (P aim -P wind ) Among them, P obj Indicates the power command value of the fan only when it is in frequency response; P wind Indicates the operating power of the fan; K vw Indicates wind speed determination coefficient; K preco Indicates the speed variation coefficient; P aim Indicates the target power of the wind turbine during frequency response.

12. The method according to claim 1, characterized in that Whether the fan starts the inertial response and frequency response function includes the following judgment process: Acquire frequency information of a common coupling point in the fan, and pass the common coupling point frequency information through a filter to obtain a corresponding filtered signal; When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the product of the frequency change value and the frequency change rate of the common coupling point is a positive number, the fan starts the inertial response and frequency response functions; When the filter signal corresponding to the common coupling point frequency information exceeds the dead zone setting value, and the product of the frequency change value and the frequency change rate of the common coupling point is a negative number, the fan does not start the inertial response and frequency response functions; The common coupling point frequency information includes one or more of the following: common coupling point frequency and common coupling point frequency change rate; the filtered signal corresponding to the common coupling point frequency is the common coupling point frequency signal; the filtered signal corresponding to the common coupling point change rate is the common coupling point change rate signal.

13. A wind turbine inertia and frequency response coordinated control system, characterized in that: include: Power calculation module: used for calculating the active power command value of the fan running in different wind speed areas during the inertial response and frequency response process when the fan starts the inertial response and frequency response functions; A state judgment module: used to judge whether the frequency of the wind turbine is in a stable state based on the active power command value of the wind turbine running in different wind speed areas during the inertial response and frequency response process; Operating point switching module: used to end the inertial response when the frequency of the fan is in a stable state, calculate the power command value of the fan only when it is in frequency response, and switch the operating point of the fan to the position corresponding to the power command value.

14. The system of claim 13, wherein: The power calculation module is specifically used for: When the wind turbine starts the inertial response and frequency response functions, the associated variable power of the wind turbine running in different wind speed areas during the inertial response and frequency response processes is calculated; Calculating the active power command value of the wind turbine operating in different wind speed regions during the inertial response and frequency response process according to the associated variable power during the inertial response and frequency response process; Among them, the associated variable power includes one or more of the following: an inertial response additional power value, a frequency response additional power value and an operating point power change value; the wind speed area includes: a low wind speed area and a high wind speed area; the low wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is less than the set tip speed ratio value; the high wind speed area is the area where the operating point of the fan moves on the wind energy utilization coefficient curve when the tip speed ratio of the fan is greater than or equal to the tip speed ratio value.

15. A computer device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, a method for coordinated control of inertia and frequency response of a wind turbine as claimed in any one of claims 1 to 12 is implemented.

16. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the inertia and frequency response coordinated control method of the wind turbine as described in any one of claims 1 to 12 is implemented.

Images