High-frequency resonance suppression method, device, equipment, storage medium and program product

Abstract

The embodiment of the invention provides a high-frequency resonance suppression method and device, equipment, a storage medium and a program product, relates to the technical field of electric power, and can reduce the risk of high-frequency resonance of an electric power system. The high-frequency resonance suppression method comprises the following steps: acquiring a current signal, wherein the current signal is a current signal which does not enter a system control link; determining whether phase deviation occurs in the current signal; if the current signal has phase deviation, performing filtering phase processing on the current signal to obtain a target current signal; and performing high-frequency resonance suppression processing according to the target current signal.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a high-frequency resonance suppression method, device, equipment, storage medium and program product. Background Art

[0002] Flexible DC transmission is a technology that uses voltage source converters for power transmission, allowing flexible power exchange between AC grids. Unlike traditional high-voltage DC transmission based on current source converters, flexible DC transmission technology has better dynamic performance and control capabilities, and can compensate and support reactive power without relying on the strength of the AC grid.

[0003] However, flexible direct current transmission also faces some challenges, one of which is the risk of high-frequency resonance under certain conditions, leading to accidents such as equipment failure and decreased system stability. Specifically, in the process of current transformer measuring current, since the amplitude of the output signal of the current transformer increases with the increase of frequency, the amplitude of the output signal reaches the maximum value under high-frequency conditions, and the amplitude change rate of the output signal also reaches the peak value. When the amplitude of the output signal of the current transformer reaches the peak value, the phase of its input signal drops from 0° to -180°. This extreme change in phase will cause the negative feedback control originally used for system stability to be transformed into positive feedback control, causing the system to lose stability and cause high-frequency resonance. Summary of the invention

[0004] To solve the above problems, the present application provides a high-frequency resonance suppression method, device, equipment, storage medium and program product.

[0005] In a first aspect, a high-frequency resonance suppression method is provided, comprising:

[0006] Acquire a current signal, where the current signal is a current signal that has not entered a system control link;

[0007] determining whether a current signal is phase shifted;

[0008] If the current signal has a phase shift, the current signal is subjected to filtering phase processing to obtain a target current signal;

[0009] Perform high-frequency resonance suppression processing based on the target current signal.

[0010] Furthermore, filtering phase processing is performed on the current signal to obtain a target current signal, including:

[0011] Filtering the current signal based on a low-pass filter;

[0012] The filtered current signal is subjected to phase correction processing to obtain a target current signal.

[0013] Furthermore, a phase correction process is performed on the filtered current signal to obtain a target current signal, including:

[0014] Detecting the phase shift of the current signal after filtering;

[0015] The filtered current signal is subjected to phase correction processing based on the phase offset and the preset phase value to obtain a target current signal.

[0016] Further, determining whether the current signal has a phase shift includes:

[0017] Obtaining a current measurement model of a current transformer secondary system in a dq coordinate system;

[0018] determining a transfer ratio of the output current to the input current based on a current measurement model;

[0019] Whether a phase shift occurs in the current signal is determined based on the transfer ratio.

[0020] Furthermore, the above method also includes:

[0021] If the current signal has no phase shift, the current signal is output.

[0022] In a second aspect, the present application provides a high-frequency resonance suppression device, comprising:

[0023] An acquisition module is used to acquire a current signal, where the current signal is a current signal that has not entered a system control link;

[0024] A determination module, used to determine whether a phase shift occurs in the current signal;

[0025] A processing module, used to filter the current signal to obtain a target current signal if a phase shift occurs in the current signal;

[0026] The processing module is also used to perform high-frequency resonance suppression processing according to the target current signal.

[0027] Furthermore, the processing module is specifically used for:

[0028] Filtering the current signal based on a low-pass filter;

[0029] The filtered current signal is subjected to phase correction to obtain a target current signal.

[0030] Furthermore, the processing module is specifically used for:

[0031] Detecting the phase shift of the current signal after filtering;

[0032] The filtered current signal is subjected to phase correction processing based on the phase offset and the preset phase value to obtain a target current signal.

[0033] Furthermore, a module is determined, specifically for:

[0034] Obtaining a current measurement model of a current transformer secondary system in a dq coordinate system;

[0035] determining a transfer ratio of the output current to the input current based on a current measurement model;

[0036] Whether a phase shift occurs in the current signal is determined based on the transfer ratio.

[0037] Furthermore, the processing module is also used for:

[0038] If the current signal has no phase shift, the current signal is output.

[0039] In a third aspect, the present application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the high-frequency resonance suppression method when executing the program.

[0040] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above-mentioned high-frequency resonance suppression method when executed by a processor.

[0041] In a fifth aspect, the present application provides a computer program product, including a computer program / instruction, which implements the steps of the above-mentioned high-frequency resonance suppression method when executed by a processor.

[0042] In this way, the technical solution provided by the present application determines whether the current signal has a phase shift before the current signal enters the system control link, and performs phase filtering on the current signal with a phase shift, thereby reducing the high-frequency component in the current signal, correcting the phase shift of the current signal, and preventing the current signal with a phase shift from being input into the system control link, so as to avoid the system losing system stability, thereby improving the operating stability of the flexible DC transmission system and reducing the risk of high-frequency resonance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate some embodiments of this specification or 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, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1A schematic diagram of the change of amplitude and phase provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of current change provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of the architecture of a power system provided in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of a flow chart of a high-frequency resonance suppression method provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of the result of a fast Fourier analysis of a current signal provided in an embodiment of the present application;

[0049] Figure 6 A schematic flow chart of another high-frequency resonance suppression method provided in an embodiment of the present application;

[0050] Figure 7 An equivalent model diagram of a current measurement model provided in an embodiment of the present application;

[0051] Figure 8 A schematic flow chart of another high-frequency resonance suppression method provided in an embodiment of the present application;

[0052] Fig. 9 A schematic flow chart of another high-frequency resonance suppression method provided in an embodiment of the present application;

[0053] Fig.10 A schematic diagram of voltage change provided in an embodiment of the present application;

[0054] Fig.11 A schematic diagram of the structure of a high-frequency resonance suppression device provided in an embodiment of the present application;

[0055] Fig.12 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in some embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on some embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of this document 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 interchangeable where appropriate, so that the embodiments of this document described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment 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 equipment. It should be noted that the acquisition, storage, use, processing, etc. of data in the technical solution of this application comply with the relevant provisions of relevant laws and regulations.

[0058] Flexible DC transmission is a technology that uses voltage source converters to transmit power, allowing flexible power exchange between AC power grids. Different from traditional high-voltage DC transmission based on current source converters, flexible DC transmission technology has better dynamic performance and control capabilities, and has great advantages in areas such as asynchronous interconnection of AC power grids and offshore wind power transmission.

[0059] However, flexible DC transmission also faces some challenges, one of which is the risk of high-frequency resonance under certain conditions, leading to equipment failure, system stability degradation and other accidents. Among them, the most typical and complex is the high-frequency resonance of the flexible DC transmission converter station under no-load in the island operation mode, which is a system-level problem involving multiple devices such as primary equipment, secondary system and control system. When the flexible DC transmission converter station is operating at low power or zero power, during the current detection process of the current transformer, due to the transmission characteristics of its secondary system, it is easier to induce high-frequency resonance in the flexible DC transmission converter station under the closed-loop strategy.

[0060] Specifically, during the current transformer measuring current, the amplitude of the output signal of the current transformer increases with the increase of frequency, resulting in the amplitude of the output signal reaching a peak value under high frequency conditions. Figure 1 As shown in Figure A, it reaches a peak value at about 5kHz. And in the high frequency range of 1k~10kHz, the amplitude change speed of the output signal also reaches a peak value. In the same frequency band, the phase of the current decreases as the amplitude of the output signal increases, as shown in Figure 1. Figure 1 As shown in Figure B, when the amplitude of the output signal of the current transformer reaches its peak, the phase of the input signal drops from 0° to -180°. This extreme change in phase will cause the negative feedback control originally used for system stability to be transformed into positive feedback control, causing the system to lose stability and cause high-frequency resonance. Figure 2As shown, this is a schematic diagram of the current change when high-frequency resonance occurs. Figure 2 The horizontal axis represents time and the vertical axis represents current. In the time period from 0.25s to 0.35s, the current is obviously distorted due to high-frequency resonance, and the power system is in an unstable state.

[0061] Based on this, the present application provides a high-frequency resonance suppression method, which can filter the current signal before it enters the system control link to reduce the high-frequency component in the current signal, correct the phase shift of the current signal, and prevent the current signal with phase shift from being input into the system control link, so as to avoid the system losing system stability, improve the operating stability of the flexible direct current transmission system, and reduce the risk of high-frequency resonance.

[0062] like Figure 3 , which is a schematic diagram of the architecture of an electric power system provided in an embodiment of the present application, the electric power system 10 includes a current transformer 110 and a control system 120 .

[0063] In some embodiments, the power system 10 may be a flexible direct current transmission system or other types of power systems, which is not limited in the present application.

[0064] In some embodiments, the current transformer 110 is used to measure and monitor the current of the power system 10, and is connected to the control system 120. The current transformer 110 may be an electromagnetic current transformer or other types of current transformers, which are not limited in the present application.

[0065] In some embodiments, the control system 120 is used to ensure that the power system can operate stably. The control system has a feedback mechanism, which can detect the corresponding output data and compare it with a preset threshold, and then adjust the input according to the difference to achieve the desired output data. If the current signal is input to the control system 120, the power system 10 enters the system control link.

[0066] The application scenarios of the embodiments of the present application are not limited. The system architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. It is known to those skilled in the art that with the evolution of the power system and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0067] like Figure 4 FIG. 1 is a flow chart of a high-frequency resonance suppression method provided in an embodiment of the present application, which specifically includes the following steps:

[0068] S101, obtaining a current signal.

[0069] Among them, the current signal is the current signal that has not entered the system control link;

[0070] S102: Determine whether a phase shift occurs in the current signal.

[0071] S103: If the current signal has a phase shift, perform filtering phase processing on the current signal to obtain a target current signal.

[0072] S104: Perform high-frequency resonance suppression processing according to the target current signal.

[0073] In this way, the technical solution provided by the present application determines whether the current signal has a phase shift before the current signal enters the system control link, and performs phase filtering on the current signal with a phase shift, thereby reducing the high-frequency component in the current signal, correcting the phase shift of the current signal, and preventing the current signal with a phase shift from being input into the system control link, so as to avoid the system losing system stability, thereby improving the operating stability of the flexible DC transmission system and reducing the risk of high-frequency resonance.

[0074] The following is an explanation of each of the above steps:

[0075] S101, obtaining a current signal.

[0076] Among them, the current signal is the current signal that has not entered the system control link;

[0077] Exemplarily, the current signal that has not entered the system control link can be collected by a current transformer to obtain the current signal.

[0078] S102: Determine whether a phase shift occurs in the current signal.

[0079] In some embodiments, fast Fourier analysis and phase amplitude analysis are performed on the current signal to determine whether the current signal has a phase shift.

[0080] S103: If the current signal has a phase shift, perform filtering phase processing on the current signal to obtain a target current signal.

[0081] By reducing the high-frequency components in the current signal, the impact of the current signal on the control can be reduced when it is input into the system control link, thereby ensuring the stability of the power system.

[0082] S104: Perform high-frequency resonance suppression processing according to the target current signal.

[0083] In some embodiments, the target current signal can be directly output to the system control link, so that the system can control the system to operate stably according to the target current signal.

[0084] It can be understood that the target current signal is a current signal after filtering phase processing. The target current signal does not include high-frequency components or only includes very few high-frequency components, which will not affect the system and ensure the stability of the power system.

[0085] In some embodiments, the current signal that has not entered the system control link can be collected through a current transformer to obtain the current signal.

[0086] Among them, the current transformer is a device used to measure and monitor the current in the power system. Therefore, by installing a current transformer in front of the control system, the current signal that has not entered the control system can be measured and monitored, and the current signal that has not entered the control system can also be collected. Exemplarily, the current signal that has not entered the control system can be a current signal after passing through the secondary cable and before entering the control system, and the current transformer that collects the current signal can be an electromagnetic current transformer.

[0087] It should be noted that the current signal that has not entered the system control link indicates that the current signal has not been input into the control system. When the current signal is input into the control system, the power system enters the system control link. The control system is used to ensure that the power system can operate stably. The control system has a feedback mechanism, which can detect the corresponding output data and compare it with the preset threshold, and then adjust the input according to the difference to achieve the desired output data. Specifically, the control system has a negative feedback mechanism and a positive feedback mechanism. Under normal circumstances, when the control system receives a current signal with a deviation, it will take measures to reduce the deviation. This processing mechanism is a negative feedback mechanism. If the phase of the received current signal falls to 180°, the control system will be converted from a negative feedback mechanism to a positive feedback mechanism, resulting in the amplification of the deviation, which will make the power system unstable or even cause high-frequency resonance. Therefore, collecting and processing the current signal before the current signal enters the control system can prevent the current signal carrying high-frequency components from entering the control system and prevent the control system from being converted from a negative feedback mechanism to a positive feedback mechanism.

[0088] As a possible implementation manner, determining whether a current signal has a phase shift may be implemented as the following steps: performing fast Fourier analysis and phase amplitude analysis on the current signal to determine whether the current signal has a phase shift.

[0089] For example, by performing fast Fourier analysis on the current signal, the current signal can be converted into information in the frequency domain to identify the various frequency components in the current signal, thereby understanding whether there are unnecessary high-frequency components or harmonic components in the current signal. Figure 5 FIG. 1 is a schematic diagram of the result of a fast Fourier analysis of a current signal provided in an embodiment of the present application. Figure 5The horizontal axis represents frequency (Hz), and the vertical axis represents the amplitude percentage of each frequency component relative to the fundamental frequency (50Hz). Figure 5 It can be seen that most of the energy is concentrated near 50Hz, which is the fundamental frequency, corresponding to the power frequency of the power grid. In addition, there are some smaller energies distributed at other frequencies near 50Hz, which may be harmonics or other interference sources. Figure 5 The value of total harmonic distortion (THD) is also given, which is 115.98%. THD is a measure of the degree to which a non-sinusoidal waveform deviates from a perfect sine wave. The higher the value, the more harmonic content the signal has, that is, the greater the nonlinear distortion. In this case, the THD value is very high, indicating that the current signal contains a large amount of high-frequency harmonic components, which may have an adverse effect on the system, such as increasing losses, reducing efficiency, and even causing resonance problems.

[0090] By performing phase and amplitude analysis on the current signal, the phase difference and amplitude change of the current signal can be detected. Based on this, by performing fast Fourier analysis and phase amplitude analysis on the current signal, it is possible to determine whether the current signal carries a high-frequency component and whether a phase shift occurs, thereby preventing the current signal with a phase shift from being input into the control system, causing risks such as system instability.

[0091] As another possible implementation, determining whether the current signal has a phase shift may be implemented as the following steps: determining whether the current signal has a phase shift based on an output current and an input current corresponding to the current signal.

[0092] The output current and input current corresponding to the current signal are the output current and input current of the secondary system of the current transformer.

[0093] like Figure 6 As shown, in order to determine whether the current signal has a phase shift based on the output current and the input current corresponding to the current signal, it can be specifically implemented as the following steps:

[0094] S201. Obtain a current measurement model of a current transformer secondary system in a dq coordinate system.

[0095] It should be noted that the control system of the power system is based on the dq coordinate system. Therefore, in order to facilitate stability analysis, it is necessary to perform Park transformation on the equivalent model of the secondary system to obtain the mathematical relationship in the dq coordinate system. Figure 7 As shown, it is the current measurement model of the current transformer secondary system in the dq axis coordinate system. Figure 7 a in the figure is the equivalent model diagram of the current measurement model under the d axis. Figure 7 b in FIG. is an equivalent model diagram of the current measurement model under the q axis.

[0096] S202 : Determine a transfer ratio between an output current and an input current based on a current measurement model.

[0097] Specifically, the transfer ratio between the output current and the input current is determined according to the mathematical relationship of the secondary system of the current measurement link in the dq coordinate system of the current measurement model.

[0098] Among them, the mathematical relationship of the secondary system of the current measurement link is as follows:

[0099]

[0100] Furthermore, ignoring the smaller loop resistance R1 of the current transformer secondary system cable, the above mathematical relationship can be sorted out to obtain the following formula:

[0101]

[0102] Wherein, L1 is the inductance of the secondary system when the current transformer measures the current signal, C1 is the capacitance of two capacitance branches of the secondary system when the current transformer measures the current signal, and the value of ω0 is 100π.

[0103] To further simplify the above formula, I L =I1-G C Substitute U1 into U1=ZI2+G L I L , the input voltage of the current transformer secondary system can be obtained:

[0104] U1=ZI2+G L I L =ZI2+G L (I1-G C U1)=ZI2+G L I1-G L G c U1

[0105] Further we get:

[0106] U1=(E+G L I1) -1 (ZI2+G L I1)

[0107] According to the above formula, the expression for determining the output current of the current transformer secondary system is:

[0108] I2=I1-G C [(E+G L G C ) -1 (ZI2+G L I1)+ZI2]

[0109] =I1-G C (E+G L G C ) -1 ZI2-G C (E+G L G C ) -1 G L I1-G C ZI2

[0110] The expression of the output current of the current transformer secondary system is sorted out to determine the matrix relationship between the output current and input current of the current transformer secondary system in the dq coordinate system:

[0111] [E+ZG C +ZG C (E+G L G C ) -1 ]I2=[EG C (E+G L G C ) -1 G L ]I1

[0112] Where E is the unit matrix, set A = (E + G L G c ) -1 , the transfer ratio of output current to input current is as follows:

[0113]

[0114] S203: Determine whether a phase shift occurs in the current signal based on the transfer ratio.

[0115] Specifically, the matrix of the secondary system of the current transformer when measuring the current signal is defined as G cable .

[0116]

[0117]

[0118] In the above formula, G cable is the parameter fitting matrix; G 11 is the first impact factor; G 12 is the second impact factor; G 21 G is the third impact factor; 22is the fourth influencing factor; s is the Laplace operator; ω0 is the rated frequency of the power grid, and its value is 100π; Z is the sampling resistor of the current measurement link; L1 is the inductance of the secondary system of the current measurement link; C1 is the capacitance of the two capacitive branches of the secondary system of the current measurement link; a is an intermediate parameter.

[0119] It should be noted that the current is a vector and has directionality. The transfer ratio of the output current and the input current is used to express the influence of the current in matrix form. cable After that, the amplitude and phase will change relative to the initial current, so it is possible to determine whether the current signal has a phase shift by the transfer ratio of the output current to the input current.

[0120] In this way, by determining whether the current signal that has not entered the system control link has a phase shift, the current signal with a phase shift can be prevented from being input into the system control link, so as to avoid the system losing system stability, thereby improving the operating stability of the flexible DC transmission system and reducing the risk of high-frequency resonance.

[0121] In some embodiments, Figure 8 As shown, filtering phase processing is performed on the current signal to obtain the target current signal, which can be specifically implemented as follows:

[0122] S301 : Filter the current signal based on a low-pass filter.

[0123] Among them, a low-pass filter is an electronic filtering device or circuit design that allows components below a certain cutoff frequency to pass through, while weakening or blocking components above the cutoff frequency. In this way, in the power system, in order to suppress high-frequency resonance, a low-pass filter is added to the system to remove the high-order components generated by the current transformer when measuring the current signal. These high-frequency components will produce a larger phase shift than the low-frequency components. Such a shift may cause the control system to change from the original negative feedback control system to positive feedback control, thereby exacerbating the instability of the system. The use of a low-pass filter can effectively filter out these high-frequency components, reduce the risk of resonance, and ensure the safe and stable operation of the system.

[0124] S302 , performing phase correction processing on the filtered current signal to obtain a target current signal.

[0125] The phase correction process is used to correct the phase shift of the current signal.

[0126] In some embodiments, Fig. 9 As shown, the filtered current signal is subjected to phase correction processing to obtain a target current signal, which can be specifically implemented as follows:

[0127] S401. Detect the phase shift of the current signal after filtering.

[0128] The phase offset is used to characterize the difference between the actual phase of the current signal and the preset phase value. The preset phase value is the expected phase, which characterizes that when the current signal is in this phase, the current signal will not have a phase offset, or the current signal will only have a small phase offset. The preset phase value can be set uniformly by the manufacturer, or can also be set according to actual conditions.

[0129] S402 , performing phase correction processing on the filtered current signal based on the phase offset and the preset phase value to obtain a target current signal.

[0130] Exemplarily, after determining the phase offset of the current signal, a phase adjustment is performed based on the phase offset and with reference to a preset phase value so that the phase of the current signal is close to the preset phase value or reaches the preset phase value, thereby completing the phase correction of the current signal so that the phase of the current signal is in a non-offset state, or close to a non-offset state.

[0131] It should be noted that, in actual application, a phase correction module for phase correction may be added to the power system to implement the above-mentioned related process of performing phase correction on the current signal.

[0132] In some embodiments, the current signal may be filtered by other types of filters.

[0133] Exemplarily, the following filters can be used to filter the current signal. For example, a digital filter. A digital filter can process signals in the digital domain and is implemented through software programming. The digital filter can accurately control the frequency response, and the high-frequency impedance threshold of the digital filter can be directly adjusted through software to eliminate the high-frequency components in the current signal, which has high flexibility. Another example is a notch filter. A notch filter can eliminate high-frequency components of a specific frequency, provide strong attenuation at a specific frequency, and does not affect components of other frequencies. Another example is a band-stop filter. A band-stop filter can eliminate high-frequency components within a wider high-frequency range and retain components of other frequencies.

[0134] In some embodiments, the phase correction process may be performed on the current signal in other ways.

[0135] For example, the phase of the current signal can be calculated and corrected through data signal processing technology. For another example, the filter parameters can be dynamically adjusted through an adaptive filter to achieve accurate phase correction. For another example, the current signal before the phase shift occurs can be tracked through phase-locked loop technology and a signal with the same frequency and phase can be output to achieve phase correction.

[0136] In some embodiments, if the current signal has no phase shift, the current signal is input.

[0137] It is understandable that the current signal has no phase shift and will not affect the control system. There is no need to perform filtering phase processing on it, and the current signal can be directly output as the target current signal.

[0138] In some embodiments, after the target current signal is obtained, the target current signal is directly output to the system control link.

[0139] For example, Fig.10 As shown, it is a schematic diagram of voltage change provided in an embodiment of the present application, representing a voltage schematic diagram of the power system after applying the technical solution provided in the present application. Fig.10 The horizontal axis represents time, and the vertical axis represents voltage value. The voltage signal shows periodic fluctuations, indicating that the power system is in a stable state.

[0140] In this way, the technical solution provided by the present application determines whether the current signal has a phase shift before the current signal enters the system control link, and performs phase filtering on the current signal with a phase shift, thereby reducing the high-frequency component in the current signal, correcting the phase shift of the current signal, and preventing the current signal with a phase shift from being input into the system control link, so as to avoid the system losing system stability, thereby improving the operating stability of the flexible DC transmission system and reducing the risk of high-frequency resonance.

[0141] It should be noted that the information collected in this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with the relevant laws, regulations and standards of the relevant countries and regions, take necessary confidentiality measures, do not violate public order and good customs, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0142] It should be noted that the technical solution provided in this application provides users with corresponding operation entrances for them to choose to agree or reject the automated decision-making results; if the user chooses to reject, the expert decision-making process will be entered.

[0143] Fig.11 Schematic diagram of the structure of a high-frequency resonance suppression device provided in an embodiment of the present application, the device is used to perform the above-mentioned high-frequency resonance suppression method, such as Fig.11 As shown, the high-frequency resonance suppression device includes: an acquisition module 1101 , a determination module 1102 and a processing module 1103 .

[0144] An acquisition module 1101 is used to acquire a current signal, where the current signal is a current signal that has not entered the control system;

[0145] A determination module 1102 is used to determine whether a phase shift occurs in the current signal;

[0146] A processing module 1103 is used to determine whether a phase shift occurs in the current signal, and to perform filtering phase processing on the current signal to obtain a target current signal;

[0147] The processing module 1103 is further used to perform high-frequency resonance suppression processing according to the target current signal.

[0148] Furthermore, the processing module 1103 is specifically configured to:

[0149] Filtering the current signal based on a low-pass filter;

[0150] The filtered current signal is subjected to phase correction to obtain a target current signal.

[0151] Furthermore, the processing module 1103 is specifically configured to:

[0152] Detecting the phase shift of the current signal after filtering;

[0153] The filtered current signal is subjected to phase correction processing based on the phase offset and the preset phase value to obtain a target current signal.

[0154] Further, the determination module 1102 is specifically configured to:

[0155] Obtaining a current measurement model of a current transformer secondary system in a dq coordinate system;

[0156] determining a transfer ratio of the output current to the input current based on a current measurement model;

[0157] Whether a phase shift occurs in the current signal is determined based on the transfer ratio.

[0158] Furthermore, the processing module 1103 is further configured to:

[0159] If the current signal has no phase shift, the current signal is output.

[0160] In this way, the technical solution provided by the present application determines whether the current signal has a phase shift before the current signal enters the system control link, and performs phase filtering on the current signal with a phase shift, thereby reducing the high-frequency component in the current signal, correcting the phase shift of the current signal, and preventing the current signal with a phase shift from being input into the system control link, so as to avoid the system losing system stability, thereby improving the operating stability of the flexible DC transmission system and reducing the risk of high-frequency resonance.

[0161] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, and specifically, the computer device may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0162] An embodiment of the present invention provides a computer device, including a memory and a processor, the memory is used to store information including program instructions, the processor is used to control the execution of the program instructions, and when the program instructions are loaded and executed by the processor, the steps of the embodiment of the above-mentioned high-frequency resonance suppression method are implemented. For a specific description, please refer to the embodiment of the above-mentioned high-frequency resonance suppression method.

[0163] Reference below Fig.12 , which shows a schematic diagram of the structure of a computer device 1200 suitable for implementing an embodiment of the present application.

[0164] like Fig.12 As shown, the computer device 1200 includes a central processing unit (CPU) 1201, which can perform various appropriate operations and processes according to a program stored in a read-only memory (ROM) 1202 or a program loaded from a storage part 1208 into a random access memory (RAM) 1203. In the RAM 1203, various programs and data required for the operation of the computer device 1200 are also stored. The CPU 1201, the ROM 1202, and the RAM 1203 are connected to each other through a bus 1204. An input / output (I / O) interface 1205 is also connected to the bus 1204.

[0165] The following components are connected to the I / O interface 1205: an input section 1206 including a keyboard, a mouse, etc.; an output section 1207 including a cathode ray tube (CRT), a liquid crystal feedback display (LCD), etc., and a speaker, etc.; a storage section 1208 including a hard disk, etc.; and a communication section 1209 including a network interface card such as a LAN card, a modem, etc. The communication section 1209 performs communication processing via a network such as the Internet. A drive 1210 is also connected to the I / O interface 1005 as needed. A removable medium 1211, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 1210 as needed, so that a computer program read therefrom is installed as the storage section 1208 as needed.

[0166] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program tangibly contained on a machine-readable medium, and the computer program includes program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication part 1209, and / or installed from the removable medium 1211.

[0167] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0168] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0169] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of 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 produce 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.

[0170] 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.

[0171] 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.

[0172] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0173] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0174] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned, and they should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0175] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt 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.) that contain computer-usable program code.

[0176] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0177] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0178] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A high frequency resonance suppression method, characterized in that: include: Acquiring a current signal, wherein the current signal is a current signal that has not entered a system control link; Determining whether a phase shift occurs in the current signal; If the current signal has a phase shift, filtering the current signal to obtain a target current signal; A high-frequency resonance suppression process is performed according to the target current signal.

2. The method according to claim 1, characterized in that The filtering phase processing is performed on the current signal to obtain a target current signal, including: Performing filtering processing on the current signal based on a low-pass filter; The filtered current signal is subjected to phase correction to obtain the target current signal.

3. The method according to claim 2, characterized in that The performing phase correction processing on the filtered current signal to obtain the target current signal includes: Detecting a phase shift of the current signal after the filtering process; A phase correction process is performed on the filtered current signal based on the phase offset and the preset phase value to obtain the target current signal.

4. The method according to claim 1, characterized in that The determining whether the current signal has a phase shift comprises: Obtaining a current measurement model of a current transformer secondary system in a dq coordinate system; determining a transfer ratio of the output current to the input current based on the current measurement model; A determination is made based on the transfer ratio whether the current signal is phase shifted.

5. The method according to claim 1, characterized in that The method further comprises: If the current signal has no phase shift, the current signal is output.

6. A high-frequency resonance suppression device, characterized in that: include: An acquisition module, used for acquiring a current signal, wherein the current signal is a current signal that has not entered a system control link; A determination module, used to determine whether a phase shift occurs in the current signal; A processing module, configured to filter the current signal to obtain a target current signal if a phase shift occurs in the current signal; The processing module is further used to perform high-frequency resonance suppression processing according to the target current signal.

7. The device according to claim 6, characterized in that The processing module is specifically used for: Performing filtering processing on the current signal based on a low-pass filter; The filtered current signal is subjected to phase correction to obtain the target current signal.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the high-frequency resonance suppression method according to any one of claims 1 to 5 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the high-frequency resonance suppression method according to any one of claims 1 to 5 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the high-frequency resonance suppression method according to any one of claims 1 to 5 are implemented.

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