Filter loss detection method, device, computer equipment, and storage medium

Abstract

The present application relates to a method, apparatus, computer equipment, and storage medium for detecting filtering loss. The method comprises: obtaining a first power signal and a second power signal, wherein the first power signal is detected from a first position on a transmission line when a preset subharmonic current is input to a filter through the transmission line, and the second power signal is detected from a second position on the transmission line, the first position being a position on the transmission line adjacent to the filter's incoming line terminal and close to the power supply side, and the second position being a position on the transmission line adjacent to the filter's incoming line terminal and close to the load side; determining a first fundamental wave quantity based on the first power signal, and determining a second fundamental wave quantity based on the second power signal; and generating the filtering loss of the filter based on the first fundamental wave quantity and the second fundamental wave quantity. This method can determine the filtering loss of the filter based on the power signal on the transmission line, thereby improving the detection accuracy of the filtering loss.

Description

Technical Field

[0001] The present application relates to the field of electrical measurement technology, and in particular to a method, apparatus, computer equipment, storage medium, and computer program product for detecting filtering loss. Background Art

[0002] In recent years, with the widespread use of nonlinear loads in power grids, harmonic pollution in power systems has become increasingly severe, leading to reduced efficiency in the production, transmission, and utilization of electrical energy. To mitigate harmonic pollution in power systems, filtering devices are typically used. For example, active power filters (APFs), passive LC filters, or electromagnetic compatibility (EMC) filters are incorporated into circuits to filter harmonics. However, losses in filtering devices during the filtering process can easily affect their cost-effectiveness. Therefore, it is necessary to monitor the filtering losses of filtering devices.

[0003] Conventional technology can determine the filter loss of a filter device by measuring the current and voltage at the filter device's input terminal and calculating the filter device's power based on the current and voltage at the input terminal. However, due to the relatively small current and voltage at the filter device's input terminal, this conventional method of detecting filter loss can result in low accuracy in detecting filter loss. Summary of the Invention

[0004] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium and computer program product for detecting filtering loss with high detection accuracy in order to address the above technical problems.

[0005] In a first aspect, the present application provides a method for detecting filtering loss. The method comprises:

[0006] Acquire a first power signal and a second power signal, wherein the first power signal is detected from a first position on a transmission line when a preset subharmonic current is input to a filter through the transmission line, and the second power signal is detected from a second position on the transmission line, the first position being a position on the transmission line adjacent to the line input terminal of the filter and close to a power supply side, and the second position being a position on the transmission line adjacent to the line input terminal of the filter and close to a load side;

[0007] determining a first fundamental wave power quantity at the first position according to the first power signal;

[0008] determining a second fundamental wave power quantity at the second position according to the second power signal;

[0009] A filtering loss of the filter is generated according to the first fundamental wave electrical quantity and the second fundamental wave electrical quantity.

[0010] In one embodiment, generating the filtering loss of the filter according to the first fundamental wave electrical quantity and the second fundamental wave electrical quantity includes:

[0011] Obtaining a difference between the first fundamental wave electrical quantity and the second fundamental wave electrical quantity as a third fundamental wave electrical quantity at a third position of the incoming line end;

[0012] The filtering loss of the filter is generated according to the third fundamental wave electrical quantity and a detection period, where the detection period is a detection period of the first power signal and the second power signal.

[0013] In one embodiment, determining the first fundamental power amount at the first location based on the first power signal includes:

[0014] determining a first current signal and a first voltage signal from the first power signal, wherein the first current signal and the first voltage signal are determined according to a first fundamental component of the preset subharmonic current at the first position;

[0015] performing Fourier transform processing on the first current signal to determine a first fundamental current at the first position;

[0016] performing Fourier transform processing on the first voltage signal to determine a first fundamental voltage at the first position;

[0017] The first fundamental wave electrical quantity at the first position is generated according to the first fundamental wave current, the first fundamental wave voltage, and the detection period.

[0018] In one embodiment, determining the second fundamental power amount at the second position according to the second power signal includes:

[0019] determining a second current signal and a second voltage signal from the second power signal, wherein the second current signal and the second voltage signal are determined according to a second fundamental component of the preset subharmonic current at the second position;

[0020] performing Fourier transform processing on the second current signal to determine a second fundamental current at the second position;

[0021] performing Fourier transform processing on the second voltage signal to determine a second fundamental voltage at the second position;

[0022] The second fundamental wave electrical quantity at the second position is generated according to the second fundamental wave current, the second fundamental wave voltage, and the detection period.

[0023] In one embodiment, the first power signal and the second power signal are detected within the same detection period after the same starting moment.

[0024] In one embodiment, the method further comprises:

[0025] determining a third current signal from the first power signal, performing Fourier transform processing on the third current signal to determine a first harmonic current at the first position, wherein the third current signal is determined based on a first harmonic component of the preset subharmonic current at the first position;

[0026] determining a fourth current signal from the second power signal, performing Fourier transform processing on the fourth current signal to determine a second harmonic current at the second position, wherein the fourth current signal is determined based on a second harmonic component of the preset subharmonic current at the second position;

[0027] A filtering rate of the filter is generated according to the first harmonic current and the second harmonic current.

[0028] In a second aspect, the present application also provides a device for detecting filter loss. The device comprises:

[0029] a signal acquisition module, configured to acquire a first power signal and a second power signal, wherein the first power signal is detected from a first position on the transmission line when a preset subharmonic current is input to the filter through the transmission line, and the second power signal is detected from a second position on the transmission line, wherein the first position is a position on the transmission line adjacent to the incoming terminal of the filter and close to the power supply side, and the second position is a position on the transmission line adjacent to the incoming terminal of the filter and close to the load side;

[0030] a first power acquisition module, configured to determine a first fundamental wave power at the first position according to the first power signal;

[0031] a second power acquisition module, configured to determine a second fundamental wave power at the second position according to the second power signal;

[0032] The loss generating module is configured to generate a filtering loss of the filter according to the first fundamental wave electrical quantity and the second fundamental wave electrical quantity.

[0033] In a third aspect, the present application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the method for detecting filtering loss described in any one of the embodiments of the first aspect.

[0034] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for detecting filtering loss described in any one of the embodiments of the first aspect.

[0035] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method for detecting filtering loss described in any one of the embodiments of the first aspect.

[0036] The above-mentioned filtering loss detection method, device, computer equipment, storage medium and computer program product input a preset subharmonic current into the filter through a transmission line, detects a first power signal at a first position adjacent to the incoming end of the transmission line and the filter and close to the power supply side, and detects a second power signal at a second position adjacent to the incoming end of the transmission line and the filter and close to the load measurement. It is possible to directly detect power signals at multiple positions of the transmission line to improve the accuracy of detection of the first power signal and the second power signal. By determining the first fundamental wave electrical quantity at the first position and the second fundamental wave electrical quantity at the second position based on the first power signal and the second power signal, the accuracy of the first fundamental wave electrical quantity and the second fundamental wave electrical quantity can be improved. By generating the filtering loss of the filter based on the first fundamental wave electrical quantity and the second fundamental wave electrical quantity, the filtering loss of the filter can be generated based on the fundamental wave electrical quantities at the first position and the second position, thereby improving the accuracy of the filtering loss.

[0037] In addition, compared with the technical means of directly detecting the current and voltage at the input end of the filter in traditional technologies, the method for detecting filtering loss provided by the present application detects the power signal at a first position adjacent to the input end of the transmission line and the filter and close to the power supply side, and the power signal at a second position adjacent to the input end of the transmission line and the filter and close to the load side, and generates the filtering loss of the filter based on the detected power signal, which can reduce the difficulty of the filtering loss detection method. Moreover, since the solution provided by the present application directly detects the power signal on the transmission line, it can be applicable to a variety of filtering loss detection application scenarios, thereby further improving the versatility of the filtering loss detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 1 is a flow chart of a method for detecting filtering loss in one embodiment;

[0039] Figure 2 1 is a flow chart of a first fundamental wave power generation step in one embodiment;

[0040] Figure 3 Schematic diagram of a flow chart of a filtration rate generation step in one embodiment;

[0041] Figure 4a is a flow chart of a method for detecting filtering loss in another embodiment;

[0042] Figure 4b is a circuit diagram of a method for detecting filtering loss in one embodiment;

[0043] Figure 5 is a structural block diagram of a device for detecting filtering loss in one embodiment;

[0044] Figure 6 is a diagram of the internal structure of a computer device in one embodiment;

[0045] Figure 7 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0046] In the prior art, power is generally measured at the input end of a filter under rated conditions or full load conditions of the filter, and the filtering loss of the filter is calculated based on the measured power.

[0047] For example, the loss measurement method proposed in the "DL / T 1796-2017 Technical Specification for Low-Voltage Active Power Filters" measures the active and reactive power at the filter's input under power-frequency inductive rated capacity conditions, and under power-frequency capacitive rated capacity conditions. The average of the active power under these two conditions is used as the filter's active power, and the average of the reactive power under these two conditions is used as the filter's reactive power. The filter's active and reactive power are then calculated and processed to determine the filter's filtering loss. However, the loss measurement method proposed in the DL / T 1796-2017 standard only considers power-frequency conditions. In actual applications, filter loss is related to both the order and magnitude of output harmonics. Furthermore, when operating at power-frequency, filters primarily produce reactive power. Therefore, errors in the phase measurement of active power are prone to occur, leading to inaccurate active power measurement and, consequently, low accuracy in filter loss measurement.

[0048] In another example, the loss measurement method proposed in "JBT 11067-2011 Low-Voltage Active Power Filter Devices" measures the filter's filtering loss by measuring the active power at the filter's input under rated capacity conditions. The loss measurement method proposed in "YD_T2323-2011 Active Power Filters" measures the filter's filtering loss by adjusting the harmonic source to achieve full-load harmonic current output at the filter while operating at rated voltage and frequency. Under full load, the apparent power and active power at the filter's input are measured. The filter's filtering loss is calculated by calculating the apparent power and active power at the filter's input. However, when using the loss measurement method proposed in these standards, fundamental power measurement is difficult and has low accuracy because the current component at the filter's input is primarily composed of the hth harmonic when filtering out the hth harmonic, while the fundamental component is very small. Furthermore, the filter's compensation for harmonic currents causes the harmonic voltage detected at the filter's input to approach zero, which can lead to inaccurate calculations of filtering loss at each harmonic order. In addition, during the operation of the filter, the large capacitor on the DC side of the filter frequently switches between the charging and discharging working states, which can easily affect the measurement of the current at the filter input end, resulting in a large deviation in the filtering loss measured at the filter input end.

[0049] In summary, existing filter loss detection methods have numerous drawbacks. To address these technical issues, this application provides a method, apparatus, computer device, storage medium, and computer program product for detecting filter loss with increased accuracy. To further clarify the objectives, technical solutions, and advantages of this application, the following detailed description is provided in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended solely to explain this application and are not intended to limit it.

[0050] In one embodiment, Figure 1 As shown, a method for detecting filtering loss is provided. This embodiment uses the method applied to a computer device as an example for illustration, wherein the computer device may store any one or more of a variety of software such as signal processing software Matlab, SCILAB, Octave, GNU Radio, etc. to process power signals. It is understandable that the method can also be applied to a server or a terminal, and can also be applied to a system including a terminal and a server, and implemented through the interaction between the terminal and the server. Among them, the terminal can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, Internet of Things devices, and portable wearable devices. The server can be implemented as an independent server or a server cluster consisting of multiple servers. In this embodiment, the method includes the following steps:

[0051] Step S102: Acquire a first power signal and a second power signal.

[0052] The first power signal may be used to represent a current or voltage signal at a first location on the transmission line.

[0053] The first position may be a position on the transmission line adjacent to the incoming end of the filter and close to the power supply side.

[0054] The second power signal may be used to represent a current and voltage signal at a second location on the transmission line.

[0055] The second position may be a position on the transmission line adjacent to the line input end of the filter and close to the load side.

[0056] Specifically, in response to a request to detect filter loss, the computer device controls a programmable harmonic current source to transmit a preset subharmonic current to the filter through a transmission line. The power signal at a first location on the transmission line is detected to obtain a first power signal at the first location. The power signal at a second location on the transmission line is detected to obtain a second power signal at the second location. The request to detect filter loss can be manually triggered by a user as needed, for example, by a user clicking a loss detection button in a corresponding filter interface to trigger the request to detect filter loss. Alternatively, the request can be automatically triggered by the computer device, for example, by automatically triggering the request to detect filter loss when the computer device detects that the filter is in an operating state.

[0057] Step S104: determining a first fundamental wave power amount at a first position according to the first power signal.

[0058] Specifically, the computer device may process the first power signal to determine a first fundamental power signal corresponding to the fundamental component in the first power signal. The first fundamental power signal may be processed to obtain current and voltage information of the fundamental component at a first location. The current and voltage information of the fundamental component at the first location may be processed to determine the first fundamental power quantity at the first location. The computer device may process the first fundamental power signal using any of a variety of digital signal conversion algorithms, such as a wavelet transform algorithm, a fast Fourier transform algorithm, or a discrete Fourier transform algorithm, to obtain the current and voltage information of the fundamental component at the first location.

[0059] Step S106: determining a second fundamental wave power amount at a second position according to the second power signal.

[0060] Specifically, the computer device may process the second power signal to determine a second fundamental power signal corresponding to the fundamental component in the second power signal. The second fundamental power signal may be processed to obtain current and voltage information of the fundamental component at the second location. The current and voltage information of the fundamental component at the second location may be processed to determine the second fundamental power quantity at the second location. The computer device may process the second fundamental power signal using any of a variety of digital signal conversion algorithms, such as a wavelet transform algorithm, a fast Fourier transform algorithm, or a discrete Fourier transform algorithm, to obtain the current and voltage information of the fundamental component at the second location.

[0061] Step S108 : generating a filtering loss of the filter according to the first fundamental wave electrical quantity and the second fundamental wave electrical quantity.

[0062] Specifically, the computer device pre-stores filtering loss generation logic. The filtering loss generation logic is used to process the first fundamental wave electricity quantity and the second fundamental wave electricity quantity to generate the filtering loss of the filter. The filtering loss generation logic may obtain the average of the first fundamental wave electricity quantity and the second fundamental wave electricity quantity, determine the difference between the second fundamental wave electricity quantity and the average, and perform calculations on the difference between the second fundamental wave electricity quantity and the average to generate the filtering loss of the filter; or it may obtain the difference between the first fundamental wave electricity quantity and the second fundamental wave electricity quantity, perform calculations on the difference between the first fundamental wave electricity quantity and the second fundamental wave electricity quantity to generate the filtering loss of the filter.

[0063] In the above-mentioned method for detecting filtering loss, a preset subharmonic current is input into the filter through the transmission line, and a first power signal is detected at a first position adjacent to the incoming end of the transmission line and the filter and close to the power supply side, and a second power signal is detected at a second position adjacent to the incoming end of the transmission line and the filter and close to the load measurement. The power signals at multiple positions of the transmission line can be directly detected to improve the accuracy of detecting the first power signal and the second power signal. By determining the first fundamental wave electrical quantity at the first position and the second fundamental wave electrical quantity at the second position based on the first power signal and the second power signal, the accuracy of the first fundamental wave electrical quantity and the second fundamental wave electrical quantity can be improved. By generating the filtering loss of the filter based on the first fundamental wave electrical quantity and the second fundamental wave electrical quantity, the filtering loss of the filter can be generated based on the fundamental wave electrical quantities at the first position and the second position, thereby improving the accuracy of the filtering loss.

[0064] In addition, compared with the technical means of directly detecting the current and voltage at the input end of the filter in traditional technologies, the method for detecting filtering loss provided by the present application detects the power signal at a first position adjacent to the input end of the transmission line and the filter and close to the power supply side, and the power signal at a second position adjacent to the input end of the transmission line and the filter and close to the load side, and generates the filtering loss of the filter based on the detected power signal, which can reduce the difficulty of the filtering loss detection method. Moreover, since the solution provided by the present application directly detects the power signal on the transmission line, it can be applicable to a variety of filtering loss detection application scenarios, thereby further improving the versatility of the filtering loss detection method.

[0065] In one embodiment, step S108 generates the filtering loss of the filter according to the first fundamental wave power and the second fundamental wave power, including: obtaining the difference between the first fundamental wave power and the second fundamental wave power, and generating the filtering loss of the filter according to the third fundamental wave power and the detection period.

[0066] The detection period may be used to characterize the detection period of the first power signal and the second power signal.

[0067] Specifically, the computer device can obtain the detection period of the first power signal and the second power signal. The computer device can perform computations on the first fundamental wave power quantity and the second fundamental wave power quantity to obtain the difference between the first fundamental wave power quantity and the second fundamental wave power quantity. The difference between the first fundamental wave power quantity and the second fundamental wave power quantity is used as the third fundamental wave power quantity at a third position at the filter input terminal. The computer device can perform computations on the third fundamental wave power quantity and the detection period to generate the filter loss of the filter.

[0068] In this embodiment, by obtaining the difference between the first fundamental wave electric quantity and the second fundamental wave electric quantity as the third fundamental wave electric quantity at the filter input end, there is no need to directly detect the filter input end, which can improve the accuracy of the third fundamental wave electric quantity, thereby improving the accuracy of the subsequent filtering loss generated based on the third fundamental wave electric quantity.

[0069] In one embodiment, Figure 2 As shown, step S104, determining the first fundamental wave power at the first position according to the first power signal, includes:

[0070] Step S202: Determine a first current signal and a first voltage signal from the first power signal.

[0071] The first current signal and the first voltage signal may be determined according to a first fundamental component of a preset subharmonic current at a first position.

[0072] Specifically, the computer device can process the first power signal, determine from the first power signal a current signal corresponding to the first fundamental component of the preset subharmonic current at the first position as the first current signal, and determine from the first power signal a voltage signal corresponding to the first fundamental component of the preset subharmonic current at the first position as the first voltage signal.

[0073] Step S204 : Perform Fourier transform processing on the first current signal to determine a first fundamental current at the first position.

[0074] Step S206: Perform Fourier transform processing on the first voltage signal to determine a first fundamental voltage at the first position.

[0075] The first fundamental current can be used to characterize the current amplitude of the first fundamental component at the first position.

[0076] The first fundamental wave voltage can be used to represent the voltage amplitude of the first fundamental wave component at the first position.

[0077] Specifically, the computer device can use seamless sampling technology to sample the first current signal and determine multiple sampling points in the first current signal. A discrete Fourier transform algorithm is used to transform each sampling point to determine the first fundamental current and the first current phase at the first location. The above operation is repeated to perform Fourier transform processing on the first voltage signal to determine the first fundamental voltage and the first voltage phase at the first location. In one example, the computer device can use a sliding time window with a sliding time window width of 256 sampling points for seamless sampling processing, with the sampling period interval between two adjacent sampling points being 78.125 microseconds.

[0078] Step S208 : generating a first fundamental wave electrical quantity at a first position according to the first fundamental wave current, the first fundamental wave voltage, and the detection period.

[0079] Specifically, the computer device may perform computational processing on the first current phase and the first voltage phase to determine the fundamental impedance angle at the first location. The computer device may also perform computational processing on the first fundamental current, the first fundamental voltage, and the fundamental impedance angle at the first location to determine the fundamental active power at the first location. The computer device may also perform computational processing on the fundamental active power at the first location and the detection period to generate the first fundamental electrical quantity at the first location.

[0080] In this embodiment, by determining the first current signal and the first voltage signal from the first power signal, Fourier transform processing is performed on the first current signal and the first voltage signal respectively, the first fundamental current and the first fundamental voltage at the first position are determined, and based on the first fundamental current, the first fundamental voltage and the detection period, the first fundamental electrical quantity at the first position is generated. This can simplify the difficulty of generating the first fundamental electrical quantity and improve the accuracy of generating the first fundamental electrical quantity, thereby improving the accuracy of filtering loss of the subsequent filter generated based on the first fundamental electrical quantity.

[0081] In one embodiment, step S106, determining the second fundamental power amount at the second position based on the second power signal, includes: determining a second current signal and a second voltage signal from the second power signal, performing Fourier transform processing on the second current signal to determine the second fundamental current at the second position, performing Fourier transform processing on the second voltage signal to determine the second fundamental voltage at the second position, and generating the second fundamental power amount at the second position based on the second fundamental current, the second fundamental voltage and the detection period.

[0082] The second current signal and the second voltage signal may be determined based on a second fundamental component of a preset subharmonic current at a second location. The second fundamental current may be used to characterize the current amplitude of the second fundamental component at the second location. The second fundamental voltage may be used to characterize the voltage amplitude of the second fundamental component at the second location.

[0083] Specifically, the computer device can process the second power signal and determine, from the second power signal, a current signal and a voltage signal corresponding to the second fundamental component of the preset subharmonic current at the second location, thereby obtaining a second current signal and a second voltage signal. The second current signal and the second voltage signal are sampled and processed using a seamless sampling technique, and each sampled point is transformed using a discrete Fourier transform algorithm to determine the second fundamental current, second current phase, second fundamental voltage, and second voltage phase at the second location. The second current phase and the second voltage phase are then processed to determine the fundamental impedance angle at the second location. The second fundamental current, second fundamental voltage, and fundamental impedance angle at the second location are then processed to determine the fundamental active power at the second location. The fundamental active power at the second location and the detection period are then processed to generate the second fundamental electrical quantity at the second location. The specific operation for generating the second fundamental electrical quantity can be implemented with reference to the method for generating the first fundamental electrical quantity provided in the above-mentioned embodiment and will not be elaborated upon here.

[0084] In this embodiment, by determining the second current signal and the second voltage signal from the second power signal, Fourier transform processing is performed on the second current signal and the second voltage signal respectively, the second fundamental current and the second fundamental voltage at the second position are determined, and based on the second fundamental current, the second fundamental voltage and the detection period, the second fundamental electric quantity at the second position is generated. This can simplify the difficulty of generating the second fundamental electric quantity and improve the generation accuracy of the second fundamental electric quantity, thereby improving the accuracy of the filtering loss of the subsequent filter generated based on the second fundamental electric quantity.

[0085] In one embodiment, the first power signal and the second power signal are detected within the same detection period after the same starting moment.

[0086] In this embodiment, by synchronously detecting the power signal at the first position and the power signal at the second position, the subsequent processing of the first power signal and the second power signal can be facilitated, and the accuracy of the subsequent filtering loss generated based on the first power signal and the second power signal can be further improved.

[0087] In one embodiment, Figure 3 As shown, the method for detecting filtering loss further includes:

[0088] Step S302: Determine a third current signal from the first power signal, perform Fourier transform processing on the third current signal, and determine a first harmonic current at a first position.

[0089] Step S304: Determine a fourth current signal from the second power signal, perform Fourier transform processing on the fourth current signal, and determine a second harmonic current at the second position.

[0090] Step S306: Generate a filter rejection rate according to the first harmonic current and the second harmonic current.

[0091] The third current signal may be determined according to a first harmonic component of a preset subharmonic current at a first position.

[0092] The first harmonic current may be used to characterize the current amplitude of the first harmonic component at the first position.

[0093] The fourth current signal may be determined according to a second harmonic component of a preset subharmonic current at a second position.

[0094] The second harmonic current can be used to represent the current amplitude of the second harmonic component at the second position.

[0095] Specifically, the computer device can process the first power signal and determine a third current signal corresponding to the first harmonic component of the preset subharmonic current at the first position from the first power signal. The third current signal is seamlessly sampled and processed, and each sampling point obtained by sampling is Fourier transformed to determine the first harmonic current at the first position. The above operation is repeated to process the second power signal and determine the second harmonic current at the second position. The difference between the first harmonic current and the second harmonic current is obtained, and the difference between the first harmonic current and the second harmonic current and the second harmonic current are calculated and processed to generate the filtering rate of the filter. In one example, a filter can be selected based on the filtering rate and the filtering requirements in different filtering scenarios.

[0096] In this embodiment, by determining the first harmonic current at the first position and the second harmonic current at the second position, the first harmonic current and the second harmonic current are operated and processed to generate the filtering rate of the filter. There is no need to directly detect the harmonic current at the input end of the filter, which can avoid the influence of the compensation effect of the filter on the harmonic current detection, thereby improving the accuracy of the filtering rate.

[0097] In one embodiment, Figure 4a As shown, a method for detecting filtering loss is provided, comprising:

[0098] Step S402: Acquire a first power signal and a second power signal.

[0099] Specifically, the computer device can control the programmable harmonic current source to transmit a preset subharmonic current to the filter via the transmission line. The computer device can detect a power signal at a first location on the transmission line to obtain a first power signal at the first location. The computer device can also detect a power signal at a second location on the transmission line to obtain a second power signal at the second location.

[0100] Step S404: determining a third current signal from the first power signal, determining a fourth current signal from the second power signal, and determining a filtering rate of the filter according to the third current signal and the fourth current signal.

[0101] Specifically, the computer device can process the first power signal and determine, from the first power signal, a third current signal corresponding to the first harmonic component of the preset subharmonic current at the first position. The computer device can also process the second power signal and determine, from the second power signal, a fourth current signal corresponding to the second harmonic component of the preset subharmonic current at the second position. The third and fourth current signals can be seamlessly sampled and processed, and each sampled point can be Fourier transformed to determine the first and second harmonic currents. The first and second harmonic currents can be computationally processed to generate a filter rejection rate. The specific filtering rate generation operation can be implemented with reference to the filtering rate generation method provided in the above-mentioned embodiment and will not be elaborated on here.

[0102] Step S406 : determining a first current signal and a first voltage signal from the first power signal, performing Fourier transform processing on the first current signal and the first voltage signal respectively, and determining a first fundamental wave electric quantity at the first position.

[0103] Step S408 : determining a second current signal and a second voltage signal from the second power signal, performing Fourier transform processing on the second current signal and the second voltage signal respectively, and determining a second fundamental wave electric quantity at the second position.

[0104] Specifically, the computer device can process the first power signal, determine from the first power signal a current signal corresponding to the first fundamental component of the preset subharmonic current at the first location, and use it as the first current signal. It can also determine from the first power signal a voltage signal corresponding to the first fundamental component of the preset subharmonic current at the first location, and use it as the first voltage signal. The first current signal and the first voltage signal are sampled and processed using seamless sampling technology, and Fourier transform processing is performed on each sampled point to determine the first fundamental current and first fundamental voltage at the first location. The first fundamental current and first fundamental voltage are then processed and processed along with a detection period to determine the first fundamental power quantity at the first location. The above operations are repeated to process the second power signal and determine the second fundamental power quantity at the second location. The specific operation for generating the first fundamental power quantity can be implemented with reference to the method for generating the first fundamental power quantity provided in the above embodiments, and the specific operation for generating the second fundamental power quantity can be implemented with reference to the method for generating the second fundamental power quantity provided in the above embodiments, which will not be elaborated upon here.

[0105] In one example, the computer device may perform Fourier transform processing according to the following formula:

[0106]

[0107] φ(h)=φ U (h)-φ I (h)

[0108] Where h is the order of harmonic current, is the voltage phasor of the hth harmonic after discrete Fourier transform, N is the number of sampling points, n is the serial number of the sampling point, u(n) is the sampling signal of the original voltage in the power signal, U(h) is the voltage amplitude of the hth harmonic, is the voltage phase of the hth harmonic, is the current phasor of the hth harmonic after discrete Fourier transform, i(n) is the sampling signal of the original current in the power signal; I(h) is the current amplitude of the hth harmonic, is the current phase of the hth harmonic, is the harmonic impedance angle of harmonic h. When h = 1, U(h) is the fundamental voltage corresponding to the fundamental component, and I(h) is the fundamental current corresponding to the fundamental component. When h > 1, U(h) is the harmonic voltage corresponding to the harmonic component, and I(h) is the harmonic current corresponding to the harmonic component.

[0109] Step S410: Obtain the difference between the first fundamental wave power and the second fundamental wave power, and generate the filtering loss of the filter according to the third fundamental wave power and the detection period.

[0110] Specifically, the computer device can perform computational processing on the first fundamental wave power quantity and the second fundamental wave power quantity, obtaining a difference between the first fundamental wave power quantity and the second fundamental wave power quantity as the third fundamental wave power quantity at a third position of the filter input terminal. The computer device can also perform computational processing on the third fundamental wave power quantity and the detection period to generate a filtering loss of the filter.

[0111] In an example, Figure 4bThe circuit diagram of a filter loss detection method is shown. A test point A is provided at a first location on a transmission line near the power source, a test point B is provided at a second location on the transmission line near the nonlinear load, and a test point C is provided at a third location on the filter input side. An LCL filter circuit and the main circuit of an active power filter (APF) form a filter circuit, while a linear load and a programmable harmonic current source form a nonlinear load. A computer device can determine the locations of test points A, B, and C on the transmission line. The programmable harmonic current source is controlled to transmit a preset harmonic current to the filter. Simultaneous measurements are taken at test points A and B to obtain voltage and current signals at these points. These voltage and current signals are seamlessly sampled and processed, yielding 256 sampling points for the voltage signal at test point A, 256 sampling points for the current signal at test point A, 256 sampling points for the voltage signal at test point B, and 256 sampling points for the current signal at test point B. Perform a Fourier transform on each sampling point to determine the fundamental current amplitude, fundamental impedance angle, and harmonic current amplitude at test point A, and the fundamental current amplitude, fundamental impedance angle, and harmonic current amplitude at test point B. Perform computational processing on the harmonic current amplitudes at test points A and B to determine the filter's rejection rate. Perform computational processing on the fundamental current amplitudes and fundamental impedance angles at test points A and B to determine the fundamental active power at test points A and B. Perform computational processing on the fundamental active power at test points A and B to determine the fundamental electrical quantity at test points A and B. Obtain the difference in fundamental electrical quantity between test points A and B as the fundamental electrical quantity at test point C. Perform computational processing on the fundamental electrical quantity at test point C and the detection periods of test points A and B to determine the filtering loss at test point C, which serves as the filtering loss required to filter out the preset subharmonic at the rejection rate. The detection period for test points A and B can be 30 seconds. The interval between sampling periods of each sampling point of test point A may be 78.125 seconds. The distance between test point A and test point C and the distance between test point B and test point C may be less than a preset distance threshold.

[0112] In one example, the computer device may generate the filtering rate according to the following formula:

[0113]

[0114] Wherein, k is the filtration rate, I Bh The harmonic component of the hth harmonic at the test point B corresponds to the second harmonic current, I Ah The harmonic component of the hth harmonic at test point A corresponds to the first harmonic current.

[0115] In one example, the computer device may generate the first fundamental wave power and the second fundamental wave power according to the following formula:

[0116]

[0117]

[0118] Among them, P A1 is the first fundamental wave power at test point A, U A1 is the first fundamental voltage at test point A, I A1 is the first fundamental current at test point A, is the fundamental impedance angle at test point A, ΔT is the detection period of the power signal at test points A and B, kwh A1 is the first fundamental wave power at test point A, P B1 is the second fundamental wave power at test point B, U B1 is the second fundamental voltage at test point B, I B1 is the second fundamental current at test point B, is the fundamental impedance angle at test point B, kwh B1 is the second fundamental wave electrical quantity at test point B.

[0119] In one example, the computer device may generate the filtering loss according to the following formula:

[0120] kwh c =kwh A1 -kwh B1

[0121]

[0122] Among them, kwh c is the third fundamental wave power at test point C, kwh A1 is the first fundamental power at test point A, kwh B1 is the second fundamental wave power at test point B, P h is the filtering loss of the filter for filtering out the hth harmonic, and ΔT is the detection period of the power signal at test points A and B.

[0123] In this embodiment, a preset subharmonic current is input into the filter through the transmission line, and a first power signal is detected at a first position adjacent to the incoming end of the transmission line and the filter and close to the power supply side. A second power signal is detected at a second position adjacent to the incoming end of the transmission line and the filter and close to the load measurement. The power signals at multiple positions of the transmission line can be directly detected to improve the accuracy of detection of the first power signal and the second power signal. By seamlessly sampling the first power signal and the second power signal, Fourier transform processing is performed on each sampling point obtained by sampling to determine the first fundamental power quantity at the first position and the second fundamental power quantity at the second position. The amount of data processed by Fourier transform can be reduced, thereby improving the generation efficiency of the fundamental power quantity, simplifying the data processing flow of the fundamental power quantity, and reducing the difficulty of generating the fundamental power quantity. By generating the filtering loss of the filter based on the first fundamental power quantity and the second fundamental power quantity, the filtering loss of the filter can be generated based on the fundamental power quantities at the first position and the second position, thereby improving the accuracy of the filtering loss.

[0124] In addition, compared with the technical means of directly detecting the current and voltage at the input end of the filter in traditional technologies, the method for detecting filtering loss provided by the present application detects the power signal at a first position adjacent to the input end of the transmission line and the filter and close to the power supply side, and the power signal at a second position adjacent to the input end of the transmission line and the filter and close to the load side, and generates the filtering loss of the filter based on the detected power signal, which can reduce the difficulty of the filtering loss detection method. Moreover, since the solution provided by the present application directly detects the power signal on the transmission line, it can be applicable to a variety of filtering loss detection application scenarios, thereby further improving the versatility of the filtering loss detection method.

[0125] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the steps or stages in other steps.

[0126] Based on the same inventive concept, embodiments of the present application also provide a filter loss detection device for implementing the aforementioned filter loss detection method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more filter loss detection device embodiments provided below can be found in the limitations of the filter loss detection method described above and will not be further elaborated here.

[0127] In one embodiment, Figure 5 As shown, a filter loss detection device 500 is provided, comprising: a signal acquisition module 502, a first power acquisition module 504, a second power acquisition module 506 and a loss generation module 508, wherein:

[0128] The signal acquisition module 502 is used to obtain a first power signal and a second power signal. The first power signal is detected from a first position of the transmission line when a preset subharmonic current is input to the filter through the transmission line. The second power signal is detected from a second position of the transmission line. The first position is a position on the transmission line adjacent to the incoming line terminal of the filter and close to the power supply side, and the second position is a position on the transmission line adjacent to the incoming line terminal of the filter and close to the load side.

[0129] The first power acquisition module 504 is configured to determine a first fundamental wave power at a first location according to the first power signal.

[0130] The second power acquisition module 506 is configured to determine a second fundamental wave power at a second location according to the second power signal.

[0131] The loss generating module 508 is configured to generate a filtering loss of the filter according to the first fundamental wave electrical quantity and the second fundamental wave electrical quantity.

[0132] In one embodiment, the loss generation module 508 includes: a third power acquisition unit, used to obtain the difference between the first fundamental power and the second fundamental power as the third fundamental power at the third position of the incoming line; a loss generation unit, used to generate the filtering loss of the filter based on the third fundamental power and the detection period, and the detection period is the detection period of the first power signal and the second power signal.

[0133] In one embodiment, the first power acquisition module 504 includes: a first signal determination unit, used to determine a first current signal and a first voltage signal from the first power signal, the first current signal and the first voltage signal are determined based on the first fundamental component of the preset subharmonic current at the first position; a first transformation processing unit, used to perform Fourier transform processing on the first current signal to determine the first fundamental current at the first position, and perform Fourier transform processing on the first voltage signal to determine the first fundamental voltage at the first position; a first power generation unit, used to generate the first fundamental power at the first position based on the first fundamental current, the first fundamental voltage and the detection period.

[0134] In one embodiment, the second power acquisition module 506 includes: a second signal determination unit, used to determine a second current signal and a second voltage signal from the second power signal, the second current signal and the second voltage signal are determined based on the second fundamental component of the preset subharmonic current at the second position; a second transformation processing unit, used to perform Fourier transform processing on the second current signal to determine the second fundamental current at the second position, and perform Fourier transform processing on the second voltage signal to determine the second fundamental voltage at the second position; a second power generation unit, used to generate the second fundamental power at the second position based on the second fundamental current, the second fundamental voltage and the detection period.

[0135] In one embodiment, the first power signal and the second power signal are detected within the same detection period after the same starting moment.

[0136] In one embodiment, the filtering loss detection device 500 further includes: a first harmonic current determination module, used to determine a third current signal from the first power signal, perform Fourier transform processing on the third current signal, and determine the first harmonic current at the first position, the third current signal is determined based on the first harmonic component of the preset subharmonic current at the first position; a second harmonic current determination module, used to determine a fourth current signal from the second power signal, perform Fourier transform processing on the fourth current signal, and determine the second harmonic current at the second position, the fourth current signal is determined based on the second harmonic component of the preset subharmonic current at the second position; a filtering rate generation module, used to generate the filtering rate of the filter based on the first harmonic current and the second harmonic current.

[0137] Each module in the aforementioned filter loss detection device may be implemented in whole or in part via software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor within a computer device in the form of hardware, or may be stored in a memory within the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0138] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 6 As shown. The computer device includes a processor, a memory, and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store signal processing software. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a method for detecting filtering loss is implemented.

[0139] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 7 As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for detecting filtering loss is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad provided on the computer device housing, or an external keyboard, touchpad or mouse.

[0140] Those skilled in the art will understand that Figure 6 and 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0141] In one embodiment, a computer device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0142] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0143] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0144] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0145] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0146] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0147] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for detecting filtering loss, characterized in that: The method comprises: Acquire a first power signal and a second power signal, wherein the first power signal is detected from a first position on a transmission line when a preset subharmonic current is input to a filter through the transmission line, and the second power signal is detected from a second position on the transmission line, the first position being a position on the transmission line adjacent to the line input terminal of the filter and close to a power supply side, and the second position being a position on the transmission line adjacent to the line input terminal of the filter and close to a load side; determining a first fundamental wave power quantity at the first position according to the first power signal; determining a second fundamental wave power quantity at the second position according to the second power signal; generating a filtering loss of the filter according to the first fundamental wave electrical quantity and the second fundamental wave electrical quantity; The acquiring of the first power signal and the second power signal includes: determining a first current signal and a first voltage signal from the first power signal, wherein the first current signal and the first voltage signal are determined according to a first fundamental component of the preset subharmonic current at the first position; performing Fourier transform processing on the first current signal to determine a first fundamental current at the first position; performing Fourier transform processing on the first voltage signal to determine a first fundamental voltage at the first position; generating the first fundamental wave power amount at the first position according to the first fundamental wave current, the first fundamental wave voltage, and a detection period, wherein the detection period is a detection period of the first power signal and the second power signal; determining a second current signal and a second voltage signal from the second power signal, wherein the second current signal and the second voltage signal are determined according to a second fundamental component of the preset subharmonic current at the second position; performing Fourier transform processing on the second current signal to determine a second fundamental current at the second position; performing Fourier transform processing on the second voltage signal to determine a second fundamental voltage at the second position; The second fundamental wave electrical quantity at the second position is generated according to the second fundamental wave current, the second fundamental wave voltage, and the detection period.

2. The method according to claim 1, characterized in that Generating the filtering loss of the filter according to the first fundamental wave electrical quantity and the second fundamental wave electrical quantity includes: Obtaining a difference between the first fundamental wave electrical quantity and the second fundamental wave electrical quantity as a third fundamental wave electrical quantity at a third position of the incoming line end; A filtering loss of the filter is generated according to the third fundamental wave electrical quantity and the detection period.

3. The method according to any one of claims 1 to 2, characterized in that The first power signal and the second power signal are detected and obtained within the same detection period after the same starting moment.

4. The method according to any one of claims 1 to 2, characterized in that The method further comprises: determining a third current signal from the first power signal, performing Fourier transform processing on the third current signal to determine a first harmonic current at the first position, wherein the third current signal is determined based on a first harmonic component of the preset subharmonic current at the first position; determining a fourth current signal from the second power signal, performing Fourier transform processing on the fourth current signal to determine a second harmonic current at the second position, wherein the fourth current signal is determined based on a second harmonic component of the preset subharmonic current at the second position; A filtering rate of the filter is generated according to the first harmonic current and the second harmonic current.

5. A device for detecting filtering loss, characterized in that: The device comprises: a signal acquisition module, configured to acquire a first power signal and a second power signal, wherein the first power signal is detected from a first position on the transmission line when a preset subharmonic current is input to the filter through the transmission line, and the second power signal is detected from a second position on the transmission line, wherein the first position is a position on the transmission line adjacent to the incoming terminal of the filter and close to the power supply side, and the second position is a position on the transmission line adjacent to the incoming terminal of the filter and close to the load side; a first power acquisition module, configured to determine a first fundamental wave power at the first position according to the first power signal; a second power acquisition module, configured to determine a second fundamental wave power at the second position according to the second power signal; a loss generating module, configured to generate a filtering loss of the filter according to the first fundamental wave electrical quantity and the second fundamental wave electrical quantity; Wherein, the first power acquisition module includes: a first signal determining unit, configured to determine a first current signal and a first voltage signal from the first power signal, wherein the first current signal and the first voltage signal are determined according to a first fundamental component of the preset subharmonic current at the first position; a first transformation processing unit, configured to perform Fourier transformation processing on the first current signal to determine a first fundamental current at the first position, and perform Fourier transformation processing on the first voltage signal to determine a first fundamental voltage at the first position; a first power generation unit, configured to generate the first fundamental power at the first position according to the first fundamental current, the first fundamental voltage, and a detection period, where the detection period is a detection period of the first power signal and the second power signal; The second power acquisition module includes: a second signal determining unit, configured to determine a second current signal and a second voltage signal from the second power signal, wherein the second current signal and the second voltage signal are determined according to a second fundamental component of the preset subharmonic current at the second position; a second transformation processing unit, configured to perform Fourier transform processing on the second current signal to determine a second fundamental current at the second position, and perform Fourier transform processing on the second voltage signal to determine a second fundamental voltage at the second position; The second power generation unit is configured to generate the second fundamental wave power at the second position according to the second fundamental wave current, the second fundamental wave voltage and the detection period.

6. The device according to claim 5, characterized in that The loss generation module includes: a third power acquisition unit, configured to acquire a difference between the first fundamental wave power and the second fundamental wave power as a third fundamental wave power at a third position of the incoming line end; The loss generating unit is configured to generate a filtering loss of the filter according to the third fundamental wave electrical quantity and the detection period.

7. The device according to any one of claims 5 to 6, characterized in that The first power signal and the second power signal are detected and obtained within the same detection period after the same starting moment.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 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 method according to any one of claims 1 to 4 are implemented.

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 4 are implemented.

Images