Subsynchronous oscillation suppression method and device, storage medium and computer program product

Abstract

The invention discloses a subsynchronous oscillation suppression method and device, a storage medium and a computer program product, and relates to the field of wind power generation. The subsynchronous oscillation suppression method comprises the steps that according to the amplitude-frequency characteristic and the phase-frequency characteristic of the electromagnetic torque increment of a doubly-fed wind turbine generator in a frequency domain, the amplitude-frequency characteristic and the phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator are calculated; determining the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator according to the amplitude-frequency characteristic and the phase-frequency characteristic of the rotating speed increment of the doubly-fed wind turbine generator in the frequency domain; the center frequency and bandwidth of a band elimination filter are determined according to the frequency range, and the band elimination filter is applied to a control structure of the doubly-fed wind turbine generator; setting parameters of the band elimination filter according to the center frequency and the bandwidth; and filtering the first current signal in the frequency range through the set band elimination filter so as to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator. By adopting the technical scheme, the problem that the subsynchronous oscillation of the doubly-fed wind turbine generator at the specific frequency cannot be inhibited in a targeted manner in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of wind power generation, and in particular to a method and device for suppressing subsynchronous oscillations, a storage medium, and a computer program product. Background Art

[0002] In the related art, the methods for suppressing subsynchronous oscillation of doubly-fed wind turbines are mainly divided into several categories, such as changing the operation mode of doubly-fed wind turbines, additional damping control, installing filters and reactive power compensation devices, etc. However, these methods cannot specifically suppress the subsynchronous oscillation problem of doubly-fed wind turbines at specific frequencies.

[0003] With regard to the problem in the related art that the subsynchronous oscillation of the doubly-fed wind turbine generator system at a specific frequency cannot be specifically suppressed, no effective solution has been proposed so far.

[0004] Therefore, it is necessary to improve the related technology to overcome the above-mentioned defects in the related technology. Summary of the invention

[0005] The embodiments of the present application provide a method and apparatus for suppressing subsynchronous oscillations, a storage medium, and a computer program product, so as to at least solve the problem in the related art that subsynchronous oscillations of a doubly-fed wind turbine generator set at a specific frequency cannot be suppressed in a targeted manner.

[0006] According to one aspect of an embodiment of the present application, a method for suppressing subsynchronous oscillation is provided, comprising: determining a frequency range of the subsynchronous oscillation of a doubly fed wind turbine generator set according to the amplitude-frequency characteristics and phase-frequency characteristics of an electromagnetic torque increment of the doubly fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristics and phase-frequency characteristics of a speed increment of the doubly fed wind turbine generator set in the frequency domain; determining a center frequency and a bandwidth of a band-stop filter according to the frequency range, wherein the band-stop filter is applied to a control structure of the doubly fed wind turbine generator set; setting parameters of the band-stop filter according to the center frequency and the bandwidth; and filtering a first current signal within the frequency range by the set band-stop filter to suppress the subsynchronous oscillation of the doubly fed wind turbine generator set.

[0007] In an exemplary embodiment, before determining the frequency range of the sub-synchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and phase-frequency characteristic of the speed increment of the doubly-fed wind turbine generator set in the frequency domain, the method further includes: when the oscillation frequency of the sub-synchronous oscillation is ω o In the case of, the electrical damping coefficient D of the doubly-fed wind turbine generator set is determined according to the following formula e _ D (ω o ):

[0008]

[0009] Where, ΔT e_D K is the electromagnetic torque increment of the doubly-fed wind turbine generator set; e_D D is the electrical elastic coefficient of the doubly-fed wind turbine generator set; e_D is the electrical damping coefficient of the doubly-fed wind turbine generator set; Δδ is the power angle increment of the doubly-fed wind turbine generator set; Δω is the angular velocity increment of the doubly-fed wind turbine generator set; K e_D (ω o )Δδ is the synchronous torque of the doubly-fed wind turbine generator set; D e_D (ω o )Δω is the damping torque of the doubly-fed wind turbine generator set.

[0010] In an exemplary embodiment, before determining the frequency range of the sub-synchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and phase-frequency characteristic of the speed increment of the doubly-fed wind turbine generator set in the frequency domain, the method further includes: when the oscillation frequency of the sub-synchronous oscillation is ω o In the case of, the transfer function H of the stator torque increment of the doubly-fed wind turbine generator set is determined according to the following formula: Tes (jω o ), the transfer function of the rotor torque increment H Ter (jω o ) and the transfer function H of the total electromagnetic torque increment to the speed increment Te (jω o ):

[0011]

[0012] Among them, H TesK The synchronous torque component of the transfer function representing the stator torque increment, H TerK The synchronous torque component of the transfer function representing the rotor torque increment, H TeK The synchronous torque component of the transfer function representing the total torque increment; H TesD The damping torque component of the transfer function representing the stator torque increment, H TerD The damping torque component of the transfer function representing the rotor torque increment, H TeD A damping torque component of the transfer function representing the total torque increase.

[0013] In an exemplary embodiment, determining the center frequency and bandwidth of the band-stop filter according to the frequency range includes: determining the bandwidth B and the center frequency f according to the following formula: n :B=f o max -fo min , f n =f o_min +B / 2, where [f o_min , f o_max ] is the frequency range.

[0014] In an exemplary embodiment, a first current signal within the frequency range is filtered by a configured band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set, including: integrating the configured band-stop filter into the output end of the inner current loop in the rotor-side converter of the doubly-fed wind turbine generator set; and filtering the first current signal within the frequency range in the current output by the inner current loop by the configured band-stop filter when the current output by the inner current loop flows through the configured band-stop filter.

[0015] In an exemplary embodiment, after filtering the first current signal within the frequency range through a set band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set, the method further includes: converting the second current signal from the time domain to the frequency domain through a fast Fourier transform to obtain a spectrum of the second current signal, wherein the second current signal is the current signal remaining after filtering out the first current signal within the frequency range from the original current; determining whether the spectrum of the second current signal is still within the frequency range; and if it is determined that the spectrum of the second current signal is still within the frequency range, adjusting the bandwidth and center frequency of the band-stop filter, and filtering the second current signal through the adjusted band-stop filter.

[0016] In an exemplary embodiment, after determining whether the frequency spectrum of the second current signal is still within the frequency range, the method further includes: when it is determined that the frequency spectrum of the second current signal is not within the frequency range, determining that the subsynchronous oscillation does not exist in the doubly-fed wind turbine generator set.

[0017] According to another aspect of an embodiment of the present application, a subsynchronous oscillation suppression device is also provided, including: a first determination module, used to determine the frequency range of the subsynchronous oscillation of the doubly fed wind turbine set according to the amplitude-frequency characteristics and phase-frequency characteristics of the electromagnetic torque increment of the doubly fed wind turbine set in the frequency domain, and the amplitude-frequency characteristics and phase-frequency characteristics of the speed increment of the doubly fed wind turbine set in the frequency domain; a second determination module, used to determine the center frequency and bandwidth of the band stop filter according to the frequency range, wherein the band stop filter is applied to the control structure of the doubly fed wind turbine set; a setting module, used to set the parameters of the band stop filter according to the center frequency and the bandwidth; a filtering module, used to filter the first current signal within the frequency range through the set band stop filter to suppress the subsynchronous oscillation of the doubly fed wind turbine set.

[0018] According to another aspect of the embodiments of the present application, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the above-mentioned subsynchronous oscillation suppression method when running.

[0019] According to another aspect of an embodiment of the present application, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the subsynchronous oscillation suppression method through the computer program.

[0020] According to another aspect of the embodiments of the present application, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps of the method described in each embodiment of the present application are implemented.

[0021] Through the present application, after determining the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine according to the amplitude-frequency characteristics and phase-frequency characteristics of the electromagnetic torque increment and speed increment of the doubly-fed wind turbine in the frequency domain, the center frequency and bandwidth of the band-stop filter are determined according to the frequency range, and the parameters of the band-stop filter are set according to the center frequency and bandwidth; the first current signal within the frequency range is filtered by the set band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine. This solves the problem in the related art that the subsynchronous oscillation of the doubly-fed wind turbine cannot be specifically suppressed at a specific frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 It is a hardware structure block diagram of a subsynchronous oscillation suppression method according to an embodiment of the present application;

[0025] Figure 2 is a flow chart of a method for suppressing subsynchronous oscillation according to an embodiment of the present application;

[0026] Figure 3 is a control block diagram of a method for suppressing subsynchronous oscillation according to an embodiment of the present application;

[0027] Figure 4 is a comparison diagram of simulation results of a method for suppressing subsynchronous oscillation according to an embodiment of the present application;

[0028] Figure 5 This is a comparison diagram of simulation results with a wind speed of 13 m / s in a method for suppressing subsynchronous oscillation according to an embodiment of the present application;

[0029] Figure 6 This is a comparison diagram of simulation results with a wind speed of 10 m / s in a method for suppressing subsynchronous oscillation according to an embodiment of the present application;

[0030] Figure 7 This is a comparison diagram of simulation results with a wind speed of 7 m / s in a method for suppressing subsynchronous oscillation according to an embodiment of the present application;

[0031] Figure 8 This is a comparison diagram of simulation results with a series compensation degree of 35% in a subsynchronous oscillation suppression method according to an embodiment of the present application;

[0032] Fig. 9 This is a comparison diagram of simulation results with a series compensation degree of 45% in a subsynchronous oscillation suppression method according to an embodiment of the present application;

[0033] Fig.10 This is a comparison diagram of simulation results with a series compensation degree of 55% in a subsynchronous oscillation suppression method according to an embodiment of the present application;

[0034] Fig.11 It is a structural block diagram of a subsynchronous oscillation suppression device according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, doubly-fed wind turbine, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] The method embodiments provided in the embodiments of the present application can be executed in a doubly-fed wind turbine generator set or a similar computing device. Taking the operation on a doubly-fed wind turbine generator set as an example, Figure 1 1 is a hardware structure block diagram of a doubly-fed wind turbine generator system of a subsynchronous oscillation suppression method according to an embodiment of the present application. Figure 1 As shown, the doubly-fed wind turbine generator system may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor (Central Processing Unit, MCU) or a programmable logic device (Field Programmable Gate Array, FPGA)) and a memory 104 for storing data, wherein the above-mentioned double-fed wind turbine set may also include a transmission device 106 for communication functions and an input and output device 108. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the above-mentioned doubly-fed wind turbine generator set. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0038] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for suppressing subsynchronous oscillations in the embodiment of the present application. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the double-fed wind turbine generator set via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0039] A wireless network provided by a communication provider of the double-fed wind turbine. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0040] In this embodiment, a method for suppressing subsynchronous oscillation is provided, which is applied to the above-mentioned doubly-fed wind turbine generator set. Figure 2 is a flow chart of a method for suppressing subsynchronous oscillation according to an embodiment of the present application, such as Figure 2 As shown, the process includes the following steps:

[0041] Step S202, determining a frequency range of a subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and phase-frequency characteristic of an electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and phase-frequency characteristic of a speed increment of the doubly-fed wind turbine generator set in the frequency domain;

[0042] Step S204, determining a center frequency and a bandwidth of a band-stop filter according to the frequency range, wherein the band-stop filter is applied to a control structure of the doubly-fed wind turbine generator set;

[0043] Step S206, setting parameters of the band-stop filter according to the center frequency and the bandwidth;

[0044] Step S208: filtering the first current signal within the frequency range by using the configured band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set.

[0045] Through the above steps, the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine is determined according to the amplitude-frequency characteristics and phase-frequency characteristics of the electromagnetic torque increment of the doubly-fed wind turbine in the frequency domain, and the amplitude-frequency characteristics and phase-frequency characteristics of the speed increment of the doubly-fed wind turbine in the frequency domain; the center frequency and bandwidth of the band-stop filter are determined according to the frequency range, wherein the band-stop filter is applied to the control structure of the doubly-fed wind turbine; the parameters of the band-stop filter are set according to the center frequency and the bandwidth; the first current signal within the frequency range is filtered by the set band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine. This solves the problem in the related art that the subsynchronous oscillation of the doubly-fed wind turbine at a specific frequency cannot be specifically suppressed.

[0046] In an exemplary embodiment, before determining the frequency range of the sub-synchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and phase-frequency characteristic of the speed increment of the doubly-fed wind turbine generator set in the frequency domain, the method further includes: when the oscillation frequency of the sub-synchronous oscillation is ω o In the case of, the electrical damping coefficient D of the doubly-fed wind turbine generator set is determined according to the following formula e _ D (ω o ):

[0047]

[0048] Where, ΔT e_D K is the electromagnetic torque increment of the doubly-fed wind turbine generator set; e_D D is the electrical elastic coefficient of the doubly-fed wind turbine generator set; e_D is the electrical damping coefficient of the doubly-fed wind turbine generator set; Δδ is the power angle increment of the doubly-fed wind turbine generator set; Δω is the angular velocity increment of the doubly-fed wind turbine generator set; K e_D (ω o )Δδ is the synchronous torque of the doubly-fed wind turbine generator set; D e_D (ω o )Δω is the damping torque of the doubly-fed wind turbine generator set.

[0049] In this embodiment, the electromagnetic torque increment ΔT of the doubly-fed wind turbine generator set e_D It is used to suppress the power angle increment Δδ and angular velocity increment Δω of the doubly-fed wind turbine. It should be clear that when the electrical damping coefficient D e _ D (ω o ) is positive, indicating that the double-fed wind turbine generator system is oThe positive electrical damping at the frequency means that the doubly fed wind turbine can suppress the subsynchronous oscillation caused by the power angle increment Δδ and the angular velocity increment Δω, thereby improving the stability of the doubly fed wind turbine. e _ D (ω o ) is close to zero, then the doubly fed wind turbine generator system is o There is almost no electrical damping at this frequency, and a small change in the power angle increment Δδ and the angular velocity increment Δω may lead to subsynchronous oscillation, and the stability of the doubly fed wind turbine is reduced. e _ D (ω o ) is negative, the doubly fed wind turbine generator system is o It has negative damping characteristics at low frequencies, which means that the doubly fed wind turbine will amplify subsynchronous oscillations instead of suppressing them, which is something that needs to be avoided in particular.

[0050] In an exemplary embodiment, before determining the frequency range of the sub-synchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and phase-frequency characteristic of the speed increment of the doubly-fed wind turbine generator set in the frequency domain, the method further includes: when the oscillation frequency of the sub-synchronous oscillation is ω o In the case of, the transfer function H of the stator torque increment of the doubly-fed wind turbine generator set is determined according to the following formula: Tes (jω o ), the transfer function of the rotor torque increment H Ter (jω o ) and the transfer function H of the total electromagnetic torque increment to the speed increment Te (jω o ):

[0051]

[0052] Among them, H TesK The synchronous torque component of the transfer function representing the stator torque increment, H TerK The synchronous torque component of the transfer function representing the rotor torque increment, H TeK The synchronous torque component of the transfer function representing the total torque increment; H TesD The damping torque component of the transfer function representing the stator torque increment, H TerD The damping torque component of the transfer function representing the rotor torque increment, H TeD A damping torque component of the transfer function representing the total torque increase.

[0053] In this embodiment, the transfer function H of the stator torque increment of the doubly-fed wind turbine is determined by the formula: Tes (jωo ), the transfer function of the rotor torque increment H Ter (jω o ) and the transfer function H of the total electromagnetic torque increment to the speed increment Te (jω o ). Each transfer function contains a synchronous torque component and a damping torque component. It should be clear that the synchronous torque component uses electromagnetic force to keep the angular velocity of the rotor of the doubly fed wind turbine consistent with the angular velocity of the power grid, thereby maintaining the stability of the power angle and avoiding the instability of the doubly fed wind turbine due to excessive power angle. When a subsynchronous oscillation occurs in the doubly fed wind turbine, the damping torque component can consume the oscillation energy of the subsynchronous oscillation and reduce the fluctuation amplitude of the power angle and angular velocity of the doubly fed wind turbine, so that the doubly fed wind turbine can quickly return to a stable state.

[0054] In an exemplary embodiment, determining the center frequency and bandwidth of the band-stop filter according to the frequency range includes: determining the bandwidth B and the center frequency f according to the following formula: n :B=f o_max -f o_min , f n =f o_min +B / 2, where [f o_min , f o_max ] is the frequency range.

[0055] According to the bandwidth B and the center frequency f in this embodiment n Set the parameters of the band-stop filter. The bandwidth B represents the width of the frequency range that the band-stop filter is going to suppress. When the current signal passes through the band-stop filter, the current signal in the range of [f o_min , f o_max ]The first current signal in the frequency range. Center frequency f n Being located exactly in the middle of bandwidth B ensures that the band-stop filter has the highest impedance at the center frequency, thereby most effectively attenuating subsynchronous oscillations.

[0056] In an exemplary embodiment, a first current signal within the frequency range is filtered by a configured band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set, including: integrating the configured band-stop filter into the output end of the inner current loop in the rotor-side converter of the doubly-fed wind turbine generator set; and filtering the first current signal within the frequency range in the current output by the inner current loop by the configured band-stop filter when the current output by the inner current loop flows through the configured band-stop filter.

[0057] The band-stop filter is integrated at the output end of the current inner loop in the rotor-side converter of the doubly-fed wind turbine generator set, that is, the band-stop filter is located between the output end of the current inner loop of the rotor-side converter and the rotor winding of the doubly-fed wind turbine generator set. When the current signal output by the current inner loop flows through the band-stop filter, the band-stop filter processes the current signal to filter out the first current signal within a specific frequency range, and then transmits the filtered current signal to the rotor winding of the doubly-fed wind turbine generator set.

[0058] In an exemplary embodiment, after filtering the first current signal within the frequency range through a set band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set, the method further includes: converting the second current signal from the time domain to the frequency domain through a fast Fourier transform to obtain a spectrum of the second current signal, wherein the second current signal is the current signal remaining after filtering out the first current signal within the frequency range from the original current; determining whether the spectrum of the second current signal is still within the frequency range; and if it is determined that the spectrum of the second current signal is still within the frequency range, adjusting the bandwidth and center frequency of the band-stop filter, and filtering the second current signal through the adjusted band-stop filter.

[0059] Optionally, assuming that the original current signal contains a subsynchronous oscillation frequency component of 10 Hz to 30 Hz, the frequency range of the band-stop filter is set to 15 Hz to 25 Hz, the center frequency is 20 Hz, and the bandwidth is 10 Hz. After the original current signal passes through the band-stop filter, a second current signal is obtained, and the second current signal is subjected to a fast Fourier transform to obtain a spectrum diagram of the second current signal. If there are still some current signals in the spectrum diagram that are between 15 Hz and 25 Hz, this means that the band-stop filter fails to effectively filter out the current signal within the frequency range. After confirming that the spectrum of the second current signal is still within the frequency range, adjust the bandwidth and center frequency of the band-stop filter to enhance the suppression ability of the band-stop filter within a specific frequency range. Pass the second current signal through the adjusted band-stop filter again to check whether the current signal within the frequency range is completely filtered.

[0060] In an exemplary embodiment, after determining whether the frequency spectrum of the second current signal is still within the frequency range, the method further includes: when it is determined that the frequency spectrum of the second current signal is not within the frequency range, determining that the subsynchronous oscillation does not exist in the doubly-fed wind turbine generator set.

[0061] Optionally, assuming the frequency range is 15 Hz to 25 Hz, the second current signal is subjected to a fast Fourier transform to obtain a spectrum of the second current signal. If there is no signal in the spectrum at 15 Hz to 25 Hz, it means that the band-stop filter has suppressed the subsynchronous oscillation in the doubly-fed wind turbine.

[0062] In order to better understand the process of the above-mentioned method for suppressing subsynchronous oscillations, the above-mentioned method for suppressing subsynchronous oscillations is described below in combination with an optional embodiment, but it is not used to limit the technical solution of the embodiment of the present application.

[0063] Figure 3 is a schematic diagram of a method for suppressing subsynchronous oscillation according to an embodiment of the present application, such as Figure 3 As shown, specifically including the following:

[0064] The actual value of active power P s With reference value P s_ref The active power loop PI controller is used to identify the difference between the two, i.e., the power deviation. The active power loop PI controller determines the power deviation according to the proportional coefficient K of the active power loop PI controller. p1 and the integration coefficient K i1 Calculate the reference value i of the rotor current d-axis component that needs to be adjusted rd_ref The actual value of the d-axis component of the rotor current i rd With reference value i rd_ref Input to the active current loop PI controller. The active current loop PI controller will adjust the active current loop PI controller according to the proportional coefficient K p2 and the integration coefficient K i2 The current signal that needs to be adjusted is further calculated. The current signal output by the current control link is sent to the band-stop filter, which removes the specific frequency components that cause subsynchronous oscillations, thereby purifying the current signal. The signal processed by the band-stop filter is used to calculate the d-axis component u of the rotor voltage rd , will u rd It is sent to the doubly-fed wind turbine to control the rotor current, thereby indirectly controlling the active power.

[0065] The working principle of the reactive power control loop is similar to that of the active power control loop. s With reference value Q s_ref Input into the reactive power loop PI controller. The reactive power loop PI controller is based on the power deviation and the proportional coefficient K of the reactive power loop PI controller. p3 and the integration coefficient K i3 Calculate the reference value i of the q-axis component of the rotor current that needs to be adjusted rq_ref The actual value of the q-axis component of the rotor current i rq With reference value i rq_ref Input to the reactive current loop PI controller. The reactive current loop PI controller will be based on the proportional coefficient K of the reactive current loop PI controller. p4 and the integration coefficient K i4The current signal that needs to be adjusted is further calculated to reduce the current deviation and ensure that the current matches the target value. The current signal output by the current control link is sent to the band-stop filter, which removes the specific frequency components that cause subsynchronous oscillations, thereby purifying the current signal. The signal processed by the band-stop filter is used to calculate the q-axis component u of the rotor voltage rq , will u rq It is sent to the doubly-fed wind turbine to control the rotor current, thereby indirectly controlling the active power.

[0066] Obviously, the embodiments described above are only some embodiments of the present application, not all embodiments. In order to better understand the above-mentioned method for suppressing subsynchronous oscillations, the above-mentioned process is described below in conjunction with the embodiments, but it is not intended to limit the technical solutions of the embodiments of the present application, specifically:

[0067] In an optional embodiment, in combination Figure 4 The method for suppressing subsynchronous oscillation of the present application is further described. Figure 4 As shown, including the following:

[0068] The figure shown in this embodiment intuitively reveals the suppression effect of the band-stop filter proposed in the present application installed in the inner current loop of the rotor-side converter when the series compensation capacitor is put into operation for 10 seconds. Compared with the control loop based on the traditional rotor-side controller, the subsynchronous oscillation suppression method of the present application can significantly accelerate the attenuation speed of the electromagnetic torque fluctuation when processing subsynchronous oscillations, and effectively control the attenuation amplitude to ensure the dynamic stability of the doubly fed wind turbine.

[0069] Specifically, when traditional controllers handle subsynchronous oscillations, the electromagnetic torque fluctuation attenuation process is relatively slow, and the attenuation amplitude may not reach the expected stable state. However, by introducing a band-stop filter at the output end of the rotor-side converter current inner loop, the attenuation speed of the electromagnetic torque fluctuation is significantly improved, and the attenuation amplitude is also effectively controlled, which means that the doubly fed wind turbine can recover to a stable state faster, and the energy loss and mechanical stress during the oscillation process are significantly reduced.

[0070] This simulation experiment has strongly proved that installing a band-stop filter as a suppression strategy for subsynchronous oscillations can not only effectively improve the dynamic response of the doubly-fed wind turbine under disturbances, but also significantly enhance the damping capacity of the doubly-fed wind turbine, especially when the wind power generation doubly-fed wind turbine is connected to the grid via series compensation capacitors. The band-stop filter accurately suppresses the electrical quantities within the subsynchronous frequency range, avoiding the unstable oscillation caused by the interaction between the doubly-fed wind turbine and the grid electrical doubly-fed wind turbine, thereby ensuring the overall operation safety and efficiency of the doubly-fed wind turbine.

[0071] In order to verify the effectiveness and scope of application of the subsynchronous oscillation suppression method of the present application, in an optional embodiment, Figures 5 to 7 The simulation waveform comparison of the electromagnetic torque of the doubly-fed wind turbine under three different wind speed conditions of 13m / s, 10m / s and 7m / s is shown. Figure 5 : is a comparison diagram of simulation results of a subsynchronous oscillation suppression method according to an embodiment of the present application with a wind speed of 13 m / s, such as Figure 5 As shown, including the following:

[0072] When the wind speed is 13m / s and the series compensation capacitor of the doubly fed wind turbine is put into operation after 10 seconds, the increase in wind speed is positively correlated with the enhancement of the damping capacity of the doubly fed wind turbine, which means that under higher wind speed conditions, the stability and anti-disturbance ability of the doubly fed wind turbine are better.

[0073] Figure 6 : is a comparison diagram of simulation results with a wind speed of 10 m / s in a method for suppressing subsynchronous oscillation according to an embodiment of the present application, such as Figure 6 As shown, including the following:

[0074] When the wind speed is 10m / s and the series compensation capacitor is put into operation for 10 seconds after the doubly fed wind turbine is put into operation, the subsynchronous oscillation suppression method of the present application can significantly accelerate the attenuation speed of the electromagnetic torque fluctuation when dealing with the subsynchronous oscillation, and effectively control the attenuation amplitude to ensure the dynamic stability of the doubly fed wind turbine.

[0075] Figure 7 : is a comparison diagram of simulation results of a subsynchronous oscillation suppression method according to an embodiment of the present application with a wind speed of 7 m / s, such as Figure 7 As shown, including the following:

[0076] In low wind speed environments, the presence of a band-stop filter can also significantly improve the damping performance of the subsynchronous oscillation mode, thereby accelerating the attenuation of electromagnetic torque fluctuations and reducing the oscillation amplitude of the doubly-fed wind turbine.

[0077] In order to better verify the effectiveness and scope of application of the subsynchronous oscillation suppression method of the present application, in an optional embodiment, Figures 8 to 10 It intuitively reflects the impact of the band-stop filter on the performance of the doubly-fed wind turbine when the series compensation degree is 35%, 45% and 55% respectively. Figure 8 is a comparison diagram of simulation results with a series compensation degree of 35% in a subsynchronous oscillation suppression method according to an embodiment of the present application, such as Figure 8 As shown, including the following:

[0078] When the wind speed is fixed at 10m / s and the series compensation capacitor is put into operation after the doubly fed wind turbine has been running for 10 seconds, a series compensation capacitor with a series compensation degree of 35% is put into the line. It can be observed that the addition of the band-stop filter can effectively suppress subsynchronous oscillations.

[0079] Fig. 9 is a comparison diagram of simulation results with a series compensation degree of 45% in a subsynchronous oscillation suppression method according to an embodiment of the present application, such as Fig. 9 As shown, including the following:

[0080] When the wind speed is fixed at 10m / s and the series compensation capacitor is put into operation after the doubly fed wind turbine is operated for 10 seconds, the series compensation capacitor with a series compensation degree of 45% is put into the line. Figure 8 By comparing the embodiments shown, it can be determined that within a higher series compensation degree range, the improvement of the dynamic response of the doubly-fed wind turbine generator set is more significant.

[0081] Fig.10 is a comparison diagram of simulation results with a series compensation degree of 55% in a subsynchronous oscillation suppression method according to an embodiment of the present application, such as Fig.10 As shown, including the following:

[0082] When the wind speed is fixed at 10m / s and the series compensation capacitor is put into operation after the doubly fed wind turbine has been running for 10 seconds, a series compensation capacitor with a series compensation degree of 55% is put into the line. It can be determined that with the increase of the series compensation degree of the line, the band-stop filter shows a stronger ability in suppressing subsynchronous oscillations, and the damping level of the corresponding oscillation mode in the doubly fed wind turbine is also improved.

[0083] In summary, the subsynchronous oscillation suppression method proposed in this application can not only significantly improve the attenuation speed of subsynchronous oscillation in the doubly-fed wind turbine, effectively reduce the oscillation amplitude, but more importantly, enhance the dynamic stability of the doubly-fed wind turbine. Further analysis found that when the series compensation degree of the line is in the range of 35% to 55%, especially with the increase of the series compensation degree, the suppression effect of the band-stop filter is more significant.

[0084] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of each embodiment of the present application.

[0085] In this embodiment, a device for suppressing subsynchronous oscillation is also provided, which is used to implement the above embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0086] Fig.11 : is a structural block diagram of a subsynchronous oscillation suppression device according to an embodiment of the present application, the device comprising:

[0087] A first determination module 10 is used to determine the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and phase-frequency characteristic of the speed increment of the doubly-fed wind turbine generator set in the frequency domain;

[0088] A second determination module 12 is used to determine the center frequency and bandwidth of a band-stop filter according to the frequency range, wherein the band-stop filter is applied to the control structure of the doubly-fed wind turbine generator set;

[0089] A setting module 14, used to set the parameters of the band-stop filter according to the center frequency and the bandwidth;

[0090] The filtering module 16 is used to filter the first current signal within the frequency range through a configured band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set.

[0091] Through the above device, the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine is determined according to the amplitude-frequency characteristics and phase-frequency characteristics of the electromagnetic torque increment of the doubly-fed wind turbine in the frequency domain, and the amplitude-frequency characteristics and phase-frequency characteristics of the speed increment of the doubly-fed wind turbine in the frequency domain; the center frequency and bandwidth of the band-stop filter are determined according to the frequency range, wherein the band-stop filter is applied to the control structure of the doubly-fed wind turbine; the parameters of the band-stop filter are set according to the center frequency and the bandwidth; the first current signal within the frequency range is filtered by the set band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine. This solves the problem in the related art that the subsynchronous oscillation of the doubly-fed wind turbine at a specific frequency cannot be specifically suppressed.

[0092] In an exemplary embodiment, the first determining module 10 is further configured to determine, when the oscillation frequency of the secondary synchronous oscillation is ω o In the case of, the electrical damping coefficient D of the doubly-fed wind turbine generator set is determined according to the following formula e _ D (ωo):

[0093]

[0094] Where, ΔT e_D K is the electromagnetic torque increment of the doubly-fed wind turbine generator set; e_D D is the electrical elastic coefficient of the doubly-fed wind turbine generator set; e_D is the electrical damping coefficient of the doubly-fed wind turbine generator set; Δδ is the power angle increment of the doubly-fed wind turbine generator set; Δω is the angular velocity increment of the doubly-fed wind turbine generator set; K e_D (ω o )Δδ is the synchronous torque of the doubly-fed wind turbine generator set; D e_D (ω o )Δω is the damping torque of the doubly-fed wind turbine generator set.

[0095] In an exemplary embodiment, the first determining module 10 is further configured to determine, when the oscillation frequency of the secondary synchronous oscillation is ω o In the case of, the transfer function H of the stator torque increment of the doubly-fed wind turbine generator set is determined according to the following formula: Tes (jω o ), the transfer function of the rotor torque increment H Ter (jω o ) and the transfer function H of the total electromagnetic torque increment to the speed increment Te (jω o ):

[0096]

[0097] Among them, H TesKThe synchronous torque component of the transfer function representing the stator torque increment, H TerK The synchronous torque component of the transfer function representing the rotor torque increment, H TeK The synchronous torque component of the transfer function representing the total torque increment; H TesD The damping torque component of the transfer function representing the stator torque increment, H TerD The damping torque component of the transfer function representing the rotor torque increment, H TeD A damping torque component of the transfer function representing the total torque increase.

[0098] In an exemplary embodiment, the second determination module 12 is further configured to determine the bandwidth B and the center frequency f according to the following formula: n :B=f o_max -f o_min , f n =f o_min +B / 2, where [f o_min , f o_max ] is the frequency range.

[0099] In an exemplary embodiment, the filtering module 16 is also used to integrate the configured band-stop filter into the output end of the inner current loop in the rotor-side converter of the doubly-fed wind turbine generator system; when the current output by the inner current loop flows through the configured band-stop filter, the first current signal within the frequency range in the current output by the inner current loop is filtered by the configured band-stop filter.

[0100] In an exemplary embodiment, the filtering module 16 is also used to convert the second current signal from the time domain to the frequency domain through a fast Fourier transform to obtain a spectrum of the second current signal, wherein the second current signal is the current signal remaining after the first current signal within the frequency range is filtered out from the original current; determine whether the spectrum of the second current signal is still within the frequency range; if it is determined that the spectrum of the second current signal is still within the frequency range, adjust the bandwidth and center frequency of the band-stop filter, and filter the second current signal through the adjusted band-stop filter.

[0101] In an exemplary embodiment, the filtering module 16 is further configured to determine that the subsynchronous oscillation does not exist in the doubly-fed wind turbine generator set when it is determined that the frequency spectrum of the second current signal is not within the frequency range.

[0102] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0103] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps:

[0104] S1, determining the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristics and phase-frequency characteristics of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristics and phase-frequency characteristics of the speed increment of the doubly-fed wind turbine generator set in the frequency domain;

[0105] S2, determining a center frequency and a bandwidth of a band-stop filter according to the frequency range, wherein the band-stop filter is applied to a control structure of the doubly-fed wind turbine generator set;

[0106] S3, setting parameters of the band-stop filter according to the center frequency and the bandwidth;

[0107] S4, filtering the first current signal within the frequency range through the configured band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set.

[0108] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0109] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0110] An embodiment of the present application further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0111] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0112] S1, determining the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristics and phase-frequency characteristics of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristics and phase-frequency characteristics of the speed increment of the doubly-fed wind turbine generator set in the frequency domain;

[0113] S2, determining a center frequency and a bandwidth of a band-stop filter according to the frequency range, wherein the band-stop filter is applied to a control structure of the doubly-fed wind turbine generator set;

[0114] S3, setting parameters of the band-stop filter according to the center frequency and the bandwidth;

[0115] S4, filtering the first current signal within the frequency range through the configured band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set.

[0116] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0117] An embodiment of the present application further provides a computer program product, comprising a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program product, and when the computer program is executed by a processor, the steps of the method described in each embodiment of the present application are implemented.

[0118] Optionally, in this embodiment, the above computer program may be configured to implement the following steps when executed by a processor:

[0119] S1, determining the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristics and phase-frequency characteristics of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristics and phase-frequency characteristics of the speed increment of the doubly-fed wind turbine generator set in the frequency domain;

[0120] S2, determining a center frequency and a bandwidth of a band-stop filter according to the frequency range, wherein the band-stop filter is applied to a control structure of the doubly-fed wind turbine generator set;

[0121] S3, setting parameters of the band-stop filter according to the center frequency and the bandwidth;

[0122] S4, filtering the first current signal within the frequency range through the configured band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set.

[0123] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0124] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0125] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for suppressing subsynchronous oscillation, characterized in that: include: Determine the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristics and phase-frequency characteristics of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristics and phase-frequency characteristics of the speed increment of the doubly-fed wind turbine generator set in the frequency domain; Determining a center frequency and a bandwidth of a band-stop filter according to the frequency range, wherein the band-stop filter is applied to a control structure of the doubly-fed wind turbine generator set; Setting parameters of the band-stop filter according to the center frequency and the bandwidth; The first current signal within the frequency range is filtered by the configured band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set.

2. The method for suppressing subsynchronous oscillation according to claim 1, characterized in that: Before determining the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and the phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and the phase-frequency characteristic of the speed increment of the doubly-fed wind turbine generator set in the frequency domain, the method further includes: The oscillation frequency of the sub-synchronous oscillation is ω o In the case of, the electrical damping coefficient D of the doubly-fed wind turbine generator set is determined according to the following formula e _ D (ωo): Where, ΔT e_D K is the electromagnetic torque increment of the doubly-fed wind turbine generator set; e_D D is the electrical elastic coefficient of the doubly-fed wind turbine generator set; e_D is the electrical damping coefficient of the doubly-fed wind turbine generator set; Δδ is the power angle increment of the doubly-fed wind turbine generator set; Δω is the angular velocity increment of the doubly-fed wind turbine generator set; K e_D (ω o )Δδ is the synchronous torque of the doubly-fed wind turbine generator set; D e_D (ω o )Δω is the damping torque of the doubly-fed wind turbine generator set.

3. The method for suppressing subsynchronous oscillation according to claim 1, characterized in that: Before determining the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and the phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and the phase-frequency characteristic of the speed increment of the doubly-fed wind turbine generator set in the frequency domain, the method further includes: The oscillation frequency of the sub-synchronous oscillation is ω o In the case of, the transfer function H of the stator torque increment of the doubly-fed wind turbine generator set is determined according to the following formula: Tes (jω o ), the transfer function of the rotor torque increment H Ter (jω o ) and the transfer function H of the total electromagnetic torque increment to the speed increment Te (jω o ): Among them, H TesK The synchronous torque component of the transfer function representing the stator torque increment, H TerK The synchronous torque component of the transfer function representing the rotor torque increment, H TeK The synchronous torque component of the transfer function representing the total torque increment; H TesD The damping torque component of the transfer function representing the stator torque increment, H TerD The damping torque component of the transfer function representing the rotor torque increment, H TeD A damping torque component of the transfer function representing the total torque increase.

4. The method for suppressing subsynchronous oscillation according to claim 1, characterized in that: Determining a center frequency and a bandwidth of the band-stop filter according to the frequency range includes: The bandwidth B and the center frequency f are determined according to the following formula n :B=f o_max -f o_min , f n =f o_min +B / 2, where [f o_min , f o_max ] is the frequency range.

5. The method for suppressing subsynchronous oscillation according to claim 1, characterized in that: The method further comprises filtering the first current signal within the frequency range by using a set band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set, including: Integrate the configured band-stop filter into the output end of the inner current loop of the rotor-side converter of the doubly-fed wind turbine generator set; In a case where the current output by the inner current loop flows through the configured band-stop filter, a first current signal within the frequency range in the current output by the inner current loop is filtered by the configured band-stop filter.

6. The method for suppressing subsynchronous oscillation according to claim 1, characterized in that: After filtering the first current signal within the frequency range by the set band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set, the method further includes: Converting the second current signal from the time domain to the frequency domain by fast Fourier transform to obtain the frequency spectrum of the second current signal, wherein the second current signal is the current signal remaining after filtering out the first current signal within the frequency range from the original current; determining whether the frequency spectrum of the second current signal is still within the frequency range; When it is determined that the spectrum of the second current signal is still within the frequency range, the bandwidth and the center frequency of the band stop filter are adjusted, and the second current signal is filtered by the adjusted band stop filter.

7. The method for suppressing subsynchronous oscillation according to claim 6, characterized in that: After determining whether the frequency spectrum of the second current signal is still within the frequency range, the method further includes: When it is determined that the frequency spectrum of the second current signal is not within the frequency range, it is determined that the subsynchronous oscillation does not exist in the doubly-fed wind turbine generator set.

8. A device for suppressing subsynchronous oscillation, characterized in that: include: A first determination module is used to determine the frequency range of the subsynchronous oscillation of the doubly-fed wind turbine generator set according to the amplitude-frequency characteristic and phase-frequency characteristic of the electromagnetic torque increment of the doubly-fed wind turbine generator set in the frequency domain, and the amplitude-frequency characteristic and phase-frequency characteristic of the speed increment of the doubly-fed wind turbine generator set in the frequency domain; A second determination module is used to determine the center frequency and bandwidth of a band-stop filter according to the frequency range, wherein the band-stop filter is applied to the control structure of the doubly-fed wind turbine generator set; A setting module is used to set the parameters of the band-stop filter according to the center frequency and the bandwidth; a filtering module is used to filter the first current signal within the frequency range through the set band-stop filter to suppress the subsynchronous oscillation of the doubly-fed wind turbine generator set.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method according to any one of claims 1 to 7 when executed.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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