Three-phase voltage amplitude detection method, device, equipment and medium

Abstract

The invention discloses a three-phase voltage amplitude detection method, device and equipment and a medium, and belongs to the technical field of grid-connected inverters, and the method comprises the steps: carrying out the phase-locked tracking of a three-phase voltage through a phase-locked loop; when the phase-locked loop stably tracks the three-phase voltage, obtaining the phase output of the phase-locked loop to the three-phase voltage, and obtaining the phase information of the three-phase voltage; determining a phase interval of the three-phase voltage according to the phase information of the three-phase voltage, performing positive value taking processing on the three-phase voltage in the phase interval of the three-phase voltage to obtain target processing information, and screening the target processing information to obtain target screening information; and determining the amplitude of the three-phase voltage according to the target screening information. The amplitude of the three-phase voltage is detected through the method, and the detection result is not influenced by the frequency and amplitude change of the three-phase voltage, so that the amplitude of the three-phase voltage can be detected more accurately through the method.

Description

Technical Field

[0001] The present invention relates to the technical field of grid-connected inverters, and in particular to a method, device, equipment and medium for detecting the amplitude of a three-phase voltage. Background Art

[0002] The amplitude of three-phase voltage is crucial to ensure the safe, stable and efficient operation of power system. Therefore, the amplitude detection of three-phase voltage is a current research hotspot. In the prior art, the amplitude of three-phase voltage is usually detected by comparison method or fixed point method.

[0003] Among them, the comparison method requires real-time comparison of the amplitude of the three-phase voltage at each time point. When the comparison obtains the maximum voltage value of the three-phase voltage on phase A, phase B and phase C, the amplitude of the three-phase voltage can be determined. However, this method has high requirements for the integrity of the three-phase voltage waveform. Once the three-phase voltage is greater than the peak at the non-peak point, the detection result of the three-phase voltage amplitude will be wrong. The fixed-point method needs to calculate the number of sampling points of the three-phase voltage in one cycle based on the sampling frequency and the rated voltage frequency of the three-phase voltage, and then compare the voltage values ​​at each sampling point in the sampling cycle. When the sampling point with the largest voltage value in the sampling cycle is detected, the amplitude of the three-phase voltage can be determined. However, this method can only accurately detect the amplitude of the three-phase voltage when the frequency of the three-phase voltage does not deviate significantly. If the frequency of the three-phase voltage deviates, the amplitude of the three-phase voltage cannot be accurately detected.

[0004] It can be seen that how to more accurately detect the amplitude of the three-phase voltage is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method, device, equipment and medium for detecting the amplitude of three-phase voltage to solve the technical problem that the amplitude of three-phase voltage cannot be accurately detected in the prior art. The specific scheme is as follows:

[0006] In order to solve the above technical problems, the present invention provides a three-phase voltage amplitude detection method, comprising:

[0007] The phase-locked loop is used to phase-lock and track the three-phase voltage;

[0008] When the phase-locked loop stably tracks the three-phase voltage, the phase output of the phase-locked loop to the three-phase voltage is acquired to obtain the phase information of the three-phase voltage;

[0009] Determine the phase interval of the three-phase voltage according to the phase information of the three-phase voltage, perform positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and filter the target processing information to obtain target filtering information;

[0010] The amplitudes of the three-phase voltages are determined according to the target screening information.

[0011] Preferably, determining the phase interval of the three-phase voltage according to the phase information of the three-phase voltage, performing positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and screening the target processing information to obtain target screening information includes:

[0012] In the first phase interval or the second phase interval, a positive value processing is performed on the A phase voltage in the three-phase voltage to obtain A phase processing information;

[0013] In the third phase interval or the fourth phase interval, a B-phase voltage in the three-phase voltage is processed to take a positive value to obtain B-phase processing information;

[0014] In the fifth phase interval or the sixth phase interval, the C phase voltage in the three-phase voltage is processed to take a positive value to obtain C phase processing information; wherein the first phase interval, the second phase interval, the third phase interval, the fourth phase interval, the fifth phase interval and the sixth phase interval are all phase intervals determined according to the phase information of the three-phase voltage;

[0015] The A-phase processing information, the B-phase processing information, and the C-phase processing information are respectively screened for the maximum voltage to obtain the A-phase screening information, the B-phase screening information, and the C-phase screening information.

[0016] Preferably, determining the amplitude of the three-phase voltage according to the target screening information includes:

[0017] According to the phase corresponding to the A-phase filtering information, the phase corresponding to the B-phase filtering information and the phase corresponding to the C-phase filtering information, the amplitude of the A-phase voltage, the amplitude of the B-phase voltage and the amplitude of the C-phase voltage in the three-phase voltage are respectively obtained.

[0018] Preferably, the phase-locked tracking of the three-phase voltage using a phase-locked loop includes:

[0019] Performing Clark transformation and Park transformation on the three-phase voltage to obtain a voltage signal of the three-phase voltage on the Q axis of a two-phase rotating coordinate system, thereby obtaining a Q axis voltage signal;

[0020] The phase-locked loop is used to perform phase-locked tracking on the Q-axis voltage signal.

[0021] Preferably, when the phase-locked loop stably tracks the three-phase voltage, acquiring the phase output of the phase-locked loop to the three-phase voltage to obtain the phase information of the three-phase voltage includes:

[0022] When the Q-axis voltage signal is within a preset range, it is determined that the phase-locked loop stably tracks the three-phase voltage;

[0023] The phase output of the phase-locked loop to the Q-axis voltage signal is obtained according to the zero-static-error tracking control principle to obtain the phase information of the three-phase voltage.

[0024] Preferably, the obtaining of the phase output of the phase-locked loop to the Q-axis voltage signal according to the zero-static-error tracking control principle to obtain the phase information of the three-phase voltage includes:

[0025] The phase information of the three-phase voltage is obtained by processing the phase output of the Q-axis voltage signal using the proportional-integral controller and the integral controller in the phase-locked loop.

[0026] Preferably, the three-phase voltage is the three-phase voltage output by the power grid or the three-phase voltage output by the renewable energy power generation system via an inverter; the renewable energy power generation system includes a photovoltaic power generation device, an energy storage device and a wind power generation device.

[0027] In order to solve the above technical problems, the present invention further provides a three-phase voltage amplitude detection device, comprising:

[0028] A phase-locked tracking module is used to perform phase-locked tracking of three-phase voltage using a phase-locked loop;

[0029] A phase acquisition module, used for acquiring the phase output of the phase-locked loop to the three-phase voltage when the phase-locked loop stably tracks the three-phase voltage, so as to obtain the phase information of the three-phase voltage;

[0030] An information processing module is used to determine the phase interval of the three-phase voltage according to the phase information of the three-phase voltage, perform positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and filter the target processing information to obtain target filtering information; an amplitude determination module is used to determine the amplitude of the three-phase voltage according to the target filtering information.

[0031] In order to solve the above technical problem, the present invention further provides an electronic device, comprising:

[0032] Memory for storing computer programs;

[0033] A processor is used to implement the steps of a three-phase voltage amplitude detection method as disclosed above when executing the computer program.

[0034] In order to solve the above technical problem, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of a three-phase voltage amplitude detection method disclosed above are implemented.

[0035] Beneficial effect: In the method, firstly, a phase-locked loop is used to perform phase-locked tracking on the three-phase voltage. When the phase-locked loop can stably track the three-phase voltage, the phase output of the phase-locked loop to the three-phase voltage is obtained to obtain the phase information of the three-phase voltage; then, the phase interval of the three-phase voltage is determined according to the phase information of the three-phase voltage, and the three-phase voltage is processed to take positive values ​​within the phase interval of the three-phase voltage to obtain target processing information, and the target processing information is screened to obtain target screening information; finally, the amplitude of the three-phase voltage is determined according to the target screening information.

[0036] Compared with the prior art, in this method, the phase output of the three-phase voltage is first locked by a phase-locked loop to accurately restore the phase information of the three-phase voltage. Because there is a one-to-one mapping relationship between the amplitude information of the three-phase voltage and the phase information of the three-phase voltage, after the phase interval of the three-phase voltage is determined according to the phase information of the three-phase voltage, the amplitude information of the three-phase voltage can be roughly inferred according to the phase interval of the three-phase voltage. Since the three-phase voltage is positive and negative, the three-phase voltage is processed to take a positive value within the phase interval of the three-phase voltage, and after obtaining the target processing information, it will be more convenient to process the subsequent process. In addition, because the target processing information contains the peak information of the three-phase voltage under each positive half-wave, after the target processing information is screened and the target screening information is obtained, the amplitude of the three-phase voltage can be accurately determined according to the target screening information. In addition, because the amplitude detection result of this three-phase voltage will not be affected by the frequency and amplitude changes of the three-phase voltage, the amplitude of the three-phase voltage can be more accurately detected by this method.

[0037] Correspondingly, a three-phase voltage amplitude detection device, equipment and medium provided by the present invention also have the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0039] Figure 1A flow chart of a three-phase voltage amplitude detection method provided by an embodiment of the present invention;

[0040] Figure 2 It is a schematic diagram of the components of the three-phase voltage in the three-phase stationary coordinate system;

[0041] Figure 3 It is a schematic diagram of the components of the three-phase voltage in the two-phase rotating coordinate system;

[0042] Figure 4 for Figure 3 Schematic diagram of the components of the three-phase voltage in the two-phase rotating coordinate system when the phase angle of the three-phase voltage is zero;

[0043] Figure 5 The schematic diagram is a schematic diagram of the principle of obtaining the phase output of the phase-locked loop to the Q-axis voltage signal by using the zero-static tracking control principle;

[0044] Figure 6 A structural diagram of a three-phase voltage amplitude detection device provided by an embodiment of the present invention;

[0045] Figure 7 A structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1 , Figure 1 A flow chart of a three-phase voltage amplitude detection method provided by an embodiment of the present invention, the method comprising:

[0048] Step S11: using a phase-locked loop to perform phase-locked tracking on the three-phase voltage;

[0049] Step S12: when the phase-locked loop stably tracks the three-phase voltage, the phase output of the phase-locked loop to the three-phase voltage is obtained to obtain the phase information of the three-phase voltage;

[0050] Step S13: Determine the phase interval of the three-phase voltage according to the phase information of the three-phase voltage, perform positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and filter the target processing information to obtain target filtering information; Step S14: Determine the amplitude of the three-phase voltage according to the target filtering information.

[0051] In this embodiment, a three-phase voltage amplitude detection method is provided, by which the amplitude of the three-phase voltage can be accurately detected. In this method, firstly, a phase-locked loop is used to perform phase-locked tracking on the three-phase voltage, and thereby the phase information of the three-phase voltage is accurately obtained.

[0052] When the phase-locked loop can stably track the three-phase voltage, it means that the phase-locked loop can stably output the phase information of the three-phase voltage, and the phase information output by the phase-locked loop has been synchronized with the phase information of the three-phase voltage. At this time, the phase output of the phase-locked loop to the three-phase voltage is obtained, and the phase information of the three-phase voltage is obtained.

[0053] Because there is a one-to-one mapping relationship between the phase information of the three-phase voltage and the amplitude information of the three-phase voltage, the phase information corresponding to the peak information of the three-phase voltage can be determined by screening the phase information of the three-phase voltage in a special phase interval. That is, the phase interval of the three-phase voltage can be determined based on the phase information of the three-phase voltage, and the amplitude information of the three-phase voltage can be roughly determined within the phase interval of the three-phase voltage.

[0054] Since the three-phase voltage is both positive and negative, in order to facilitate the processing of subsequent processes, the three-phase voltage can also be processed as positive values ​​within the phase interval of the three-phase voltage to obtain the target processing information. Because the target processing information contains the peak information of the three-phase voltage under each positive half-wave, after the target processing information is screened and the target screening information is obtained, the peak information of the three-phase voltage can be accurately determined according to the target screening information, and thus the amplitude of the three-phase voltage can be determined.

[0055] Compared with the prior art, in this method, the phase output of the three-phase voltage is first locked by a phase-locked loop to accurately restore the phase information of the three-phase voltage. Because there is a one-to-one mapping relationship between the amplitude information of the three-phase voltage and the phase information of the three-phase voltage, after the phase interval of the three-phase voltage is determined according to the phase information of the three-phase voltage, the amplitude information of the three-phase voltage can be roughly inferred according to the phase interval of the three-phase voltage. Since the three-phase voltage is positive and negative, the three-phase voltage is processed to take a positive value within the phase interval of the three-phase voltage, and after obtaining the target processing information, it will be more convenient to process the subsequent process. In addition, because the target processing information contains the peak information of the three-phase voltage under each positive half-wave, after the target processing information is screened and the target screening information is obtained, the amplitude of the three-phase voltage can be accurately determined according to the target screening information. In addition, because the amplitude detection result of this three-phase voltage will not be affected by the frequency and amplitude changes of the three-phase voltage, the amplitude of the three-phase voltage can be more accurately detected by this method.

[0056] Based on the above embodiments, this embodiment further illustrates and optimizes the above technical solution. As a preferred implementation mode, the three-phase voltage is the three-phase voltage output by the power grid or the three-phase voltage output by the renewable energy power generation system via the inverter; the renewable energy power generation system includes a photovoltaic power generation device, an energy storage device and a wind power generation device.

[0057] In this embodiment, when the amplitude of the three-phase voltage is detected, the amplitude of the three-phase voltage output by the power grid can be detected, or the amplitude of the three-phase voltage output by the renewable energy power generation system via the inverter can be detected. The renewable energy power generation system includes a photovoltaic power generation device, an energy storage device, a wind power generation device, and the like.

[0058] In other words, the three-phase voltage amplitude detection method provided in the present application can be applied to the scenario of amplitude detection of the three-phase voltage output by the power grid, and can also be applied to the scenario of amplitude detection of the three-phase voltage output by the renewable energy power generation system via the inverter.

[0059] Obviously, through the technical solution provided in this embodiment, the universality of the three-phase voltage amplitude detection method provided in this application in practical applications can be further improved.

[0060] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. As a preferred implementation, the above step of using a phase-locked loop to perform phase-locked tracking on the three-phase voltage includes:

[0061] Perform Clark transformation and Park transformation on the three-phase voltage to obtain the voltage signal of the three-phase voltage on the Q axis of the two-phase rotating coordinate system, and obtain the Q axis voltage signal;

[0062] A phase-locked loop is used to phase-lock and track the Q-axis voltage signal.

[0063] See also Figure 2 , Figure 2 The three-phase voltage is a component diagram in a three-phase stationary coordinate system. The three-phase voltage can be regarded as a composite voltage of a voltage vector with a fixed amplitude and a specific rotation frequency in a three-phase stationary coordinate system. Figure 2 In , A, B and C respectively represent the A-phase voltage, B-phase voltage and C-phase voltage of the three-phase voltage, ω represents the rotation angle of the voltage vector with a specific rotation frequency, and θ represents the phase angle of the three-phase voltage.

[0064] See also Figure 3 , Figure 3The figure is a schematic diagram of the components of the three-phase voltage in a two-phase rotating coordinate system. The three-phase voltage can be regarded as a composite voltage of a voltage vector and a voltage vector with a specific rotating frequency in a two-phase rotating coordinate system. In fact, these two components are the signal components obtained by the Clark transformation and Park transformation of the three-phase voltage. Figure 3 In the figure, Q represents the Q axis in the two-phase rotating coordinate system, D represents the D axis in the two-phase rotating coordinate system, ω represents the rotation angle of the voltage vector with a specific rotation frequency, and θ represents the phase angle of the three-phase voltage. Figure 4 , Figure 4 for Figure 3 Schematic diagram of the components of the three-phase voltage in the two-phase rotating coordinate system when the phase angle of the three-phase voltage is zero.

[0065] In this embodiment, the three-phase voltage may be subjected to Clark transformation and Park transformation to obtain voltage signals of the three-phase voltage on the D axis and Q axis of the two-phase rotating coordinate system, respectively, to obtain a D axis voltage signal and a Q axis voltage signal.

[0066] Since the D-axis voltage signal and the Q-axis voltage signal are two mutually perpendicular voltage signals and have a mutual coupling relationship, the D-axis voltage signal will be affected by the Q-axis voltage signal, which means that when the D-axis voltage signal is controlled, the Q-axis voltage signal will be indirectly affected. Therefore, in this embodiment, in order to achieve accurate analysis of the three-phase voltage and simplify the amplitude detection process of the three-phase voltage, the Q-axis voltage signal can also be phase-locked and tracked using only a phase-locked loop.

[0067] Obviously, the technical solution provided in this embodiment can not only achieve the purpose of accurately analyzing the three-phase voltage, but also simplify the amplitude detection process of the three-phase voltage.

[0068] As a preferred implementation, the above step: when the phase-locked loop stably tracks the three-phase voltage, obtaining the phase output of the phase-locked loop to the three-phase voltage to obtain the phase information of the three-phase voltage includes:

[0069] When the Q-axis voltage signal is within the preset range, it is determined that the phase-locked loop is stably tracking the three-phase voltage;

[0070] The phase output of the phase-locked loop to the Q-axis voltage signal is obtained according to the zero-static-error tracking control principle to obtain the phase information of the three-phase voltage.

[0071] In this embodiment, when the Q-axis voltage signal is within a preset range, that is, when the Q-axis voltage signal is near a value of 0, it indicates that the phase-locked loop can stably track the three-phase voltage, and the subsequent process steps can be continued.

[0072] When obtaining the phase output of the phase-locked loop for the three-phase voltage, the zero-static-error tracking control principle can be used to obtain the phase output of the phase-locked loop for the Q-axis voltage signal. Because when the zero-static-error tracking control principle is used to obtain the phase output of the phase-locked loop for the Q-axis voltage signal, it can not only maintain a high tracking accuracy when the system parameters change or there is a disturbance, but also use this method to adapt to parameter changes within a certain range without affecting the tracking effect of the three-phase voltage.

[0073] Obviously, through the technical solution provided in this embodiment, the phase information of the three-phase voltage can be accurately obtained.

[0074] As a preferred implementation, the above step of obtaining the phase output of the phase-locked loop to the Q-axis voltage signal according to the zero-static-error tracking control principle to obtain the phase information of the three-phase voltage includes:

[0075] The phase information of the three-phase voltage is obtained by processing the phase output of the Q-axis voltage signal using the proportional-integral controller and the integral controller in the phase-locked loop.

[0076] In this embodiment, the proportional-integral controller and the integral controller in the phase-locked loop are used to realize the zero-static-error tracking control of the three-phase voltage. Among them, the proportional-integral controller can quickly respond to the signal changes of the three-phase voltage, and the integral controller can eliminate the steady-state error in the system, thereby ensuring that the phase-locked loop can stably output the phase of the three-phase voltage, thereby realizing the zero-static-error control of the three-phase voltage.

[0077] See also Figure 5 , Figure 5 This is a schematic diagram of the principle of obtaining the phase output of the phase-locked loop to the Q-axis voltage signal using the zero-static-error tracking control principle. Since this method can achieve zero-static-error tracking control of the three-phase voltage using only a few devices, this method can significantly reduce the complexity of obtaining the phase information of the three-phase voltage.

[0078] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. As a preferred implementation mode, the above steps: determining the phase interval of the three-phase voltage according to the phase information of the three-phase voltage, performing positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and screening the target processing information to obtain target screening information, include:

[0079] In the first phase interval or the second phase interval, a positive value processing is performed on the A phase voltage among the three-phase voltages to obtain the A phase processing information;

[0080] In the third phase interval or the fourth phase interval, a B-phase voltage in the three-phase voltage is processed to take a positive value to obtain B-phase processing information;

[0081] In the fifth phase interval or the sixth phase interval, the C phase voltage in the three-phase voltage is processed to take a positive value to obtain C phase processing information; wherein the first phase interval, the second phase interval, the third phase interval, the fourth phase interval, the fifth phase interval and the sixth phase interval are all phase intervals determined according to the phase information of the three-phase voltage;

[0082] The A-phase processing information, the B-phase processing information and the C-phase processing information are respectively screened for the maximum voltage to obtain the A-phase screening information, the B-phase screening information and the C-phase screening information.

[0083] In practical applications, due to the interference of environmental noise, the phase information output by the phase-locked loop is only roughly the same as the phase information of the three-phase voltage, but not completely consistent. In addition, the phase difference between the phase voltages in the three-phase voltage is not the ideal 120°, and there will be a certain deviation. Therefore, when determining the amplitude of the three-phase voltage based on the phase information of the three-phase voltage, it is also necessary to screen the phase information of the three-phase voltage in a specific phase interval, so as to improve the accuracy and reliability of the three-phase voltage amplitude detection results.

[0084] Taking into account that the frequency of the three-phase voltage output by the power grid may differ in different countries, in this embodiment, the phase interval of the three-phase voltage in each phase can be determined by adding or subtracting 5° before and after a specific phase, and the voltage sampling value can be recorded in the phase interval of each phase, and the amplitude of the three-phase voltage in each phase can be determined based on the maximum voltage sampling value.

[0085] Specifically, if the phase locked by the phase-locked loop is 0°, it corresponds to the positive peak voltage of phase A; if the phase locked by the phase-locked loop is 180°, it corresponds to the negative peak voltage of phase A. The phases corresponding to the positive and negative peak voltages of phases B and C differ by 120° from the phases corresponding to the positive and negative peak voltages of phase A. If the phase locked by the phase-locked loop is 120°, it corresponds to the positive peak voltage of phase B; if the phase locked by the phase-locked loop is 300°, it corresponds to the negative peak voltage of phase B; if the phase locked by the phase-locked loop is 60°, it corresponds to the positive peak voltage of phase C; if the phase locked by the phase-locked loop is 240°, it corresponds to the negative peak voltage of phase C. In this way, the phase relationship corresponding to the positive and negative peak voltages of phases A, B, and C in one cycle can be determined. Considering that the actual phase difference of the three-phase voltage cannot reach exactly 120°, it is necessary to set a phase interval to make the obtained result more accurate. Taking phase A as an example, if the phase locked by the phase-locked loop is 0°, the first phase interval is set to [-5°, 5°], and if the phase locked by the phase-locked loop is 180°, the second phase interval is set to [175°, 185°]. Similarly, the third phase interval, the fourth phase interval, the fifth phase interval and the sixth phase interval are set to [115°, 125°], [295°, 305°], [55°, 65°], and [235°, 245°] respectively.

[0086] It should be noted that since the first phase interval, the second phase interval, the third phase interval, the fourth phase interval, the fifth phase interval and the sixth phase interval are all for a complete power frequency cycle of the entire three-phase voltage, and the phase change in a complete power frequency cycle is 360°, therefore, in practical applications, it is necessary to set the first phase interval [-5°, 5°] to [355°, 360°] and [0°, 5°].

[0087] Since the three-phase voltages are both positive and negative, in order to facilitate the processing of subsequent processes, the three-phase voltages can also be processed as positive values ​​in each phase interval. That is, the phase information of the A-phase voltage in the three-phase voltage is processed as positive values ​​in the first phase interval and the second phase interval, and the A-phase processing information can be obtained; the phase information of the B-phase voltage in the three-phase voltage is processed as positive values ​​in the third phase interval and the fourth phase interval, and the B-phase processing information can be obtained; the phase information of the C-phase voltage in the three-phase voltage is processed as positive values ​​in the fifth phase interval and the sixth phase interval, and the C-phase processing information can be obtained.

[0088] After obtaining the A-phase processing information, the B-phase processing information and the C-phase processing information, the maximum voltage is filtered out from the A-phase processing information, the B-phase processing information and the C-phase processing information to obtain the A-phase filtering information, the B-phase filtering information and the C-phase filtering information.

[0089] Obviously, through the technical solution provided in this embodiment, the phase information corresponding to the amplitude information of the three-phase voltage can be accurately screened out from the phase information of the three-phase voltage.

[0090] As a preferred implementation, the above step of determining the amplitude of the three-phase voltage according to the target screening information includes:

[0091] According to the phase corresponding to the A-phase screening information, the phase corresponding to the B-phase screening information and the phase corresponding to the C-phase screening information, the amplitude of the A-phase voltage, the amplitude of the B-phase voltage and the amplitude of the C-phase voltage in the three-phase voltage are respectively obtained.

[0092] In this embodiment, when determining the amplitude of the three-phase voltage, the amplitude of the A phase voltage, the amplitude of the B phase voltage and the amplitude of the C phase voltage in the three-phase voltage can be obtained by respectively determining the maximum values ​​in the A phase filtering information, the B phase filtering information and the C phase filtering information.

[0093] That is, when the phase of the phase-locked loop output is within 355° to 360°, 0° to 5°, and 175° to 185°, the amplitude corresponding to the maximum voltage of phase A in the three-phase voltage can be determined by recording the maximum value of the voltage. Similarly, when the phase of the phase-locked loop output is within 115° to 125° and 295° to 305°, the amplitude corresponding to the maximum voltage of phase B in the three-phase voltage can be determined by recording the maximum value of the voltage, and when the phase of the phase-locked loop output is within 55° to 65° and 235° to 245°, the amplitude corresponding to the maximum voltage of phase C in the three-phase voltage can be determined by recording the maximum value of the voltage.

[0094] Obviously, through the technical solution provided by this embodiment, the amplitude of the three-phase voltage can be accurately determined.

[0095] See also Figure 6 , Figure 6 A structural diagram of a three-phase voltage amplitude detection device provided by an embodiment of the present invention, the device comprising:

[0096] The phase-locked tracking module 21 is used to perform phase-locked tracking on the three-phase voltage using a phase-locked loop;

[0097] A phase acquisition module 22, configured to acquire the phase output of the phase-locked loop to the three-phase voltage when the phase-locked loop stably tracks the three-phase voltage, and obtain phase information of the three-phase voltage;

[0098] An information processing module 23 is used to determine the phase interval of the three-phase voltage according to the phase information of the three-phase voltage, perform positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and filter the target processing information to obtain target filtering information;

[0099] The amplitude determination module 24 is used to determine the amplitude of the three-phase voltage according to the target screening information.

[0100] Preferably, the information processing module 23 includes:

[0101] A first processing submodule is used to perform positive value processing on the A phase voltage of the three-phase voltage in the first phase interval or the second phase interval to obtain A phase processing information;

[0102] A second processing submodule is used to perform positive value processing on the B-phase voltage in the three-phase voltage in the third phase interval or the fourth phase interval to obtain B-phase processing information;

[0103] A third processing submodule is used to perform positive value processing on the C phase voltage in the three-phase voltage in the fifth phase interval or the sixth phase interval to obtain C phase processing information; wherein the first phase interval, the second phase interval, the third phase interval, the fourth phase interval, the fifth phase interval and the sixth phase interval are all phase intervals determined according to the phase information of the three-phase voltage;

[0104] The information screening submodule is used to screen the A-phase processing information, the B-phase processing information and the C-phase processing information for voltage maximum values, respectively, to obtain the A-phase screening information, the B-phase screening information and the C-phase screening information.

[0105] Preferably, the amplitude determination module 24 comprises:

[0106] The amplitude determination submodule is used to obtain the amplitude of the A phase voltage, the B phase voltage and the C phase voltage in the three-phase voltage according to the phase corresponding to the A phase screening information, the phase corresponding to the B phase screening information and the phase corresponding to the C phase screening information.

[0107] Preferably, the phase-locked tracking module 21 comprises:

[0108] A coordinate transformation submodule performs Clark transformation and Park transformation on the three-phase voltage to obtain a voltage signal of the three-phase voltage on the Q axis of a two-phase rotating coordinate system, thereby obtaining a Q axis voltage signal;

[0109] The phase-locked tracking submodule is used to perform phase-locked tracking on the Q-axis voltage signal using the phase-locked loop.

[0110] Preferably, the phase acquisition module 22 includes:

[0111] A stable tracking submodule, used for determining that the phase-locked loop stably tracks the three-phase voltage when the Q-axis voltage signal is within a preset range;

[0112] The phase acquisition submodule is used to obtain the phase output of the phase-locked loop to the Q-axis voltage signal according to the zero-static-error tracking control principle, so as to obtain the phase information of the three-phase voltage.

[0113] Preferably, the phase acquisition submodule includes:

[0114] The phase acquisition unit is used to process the phase output of the Q-axis voltage signal using the proportional-integral controller and the integral controller in the phase-locked loop to obtain the phase information of the three-phase voltage.

[0115] A three-phase voltage amplitude detection device provided in an embodiment of the present invention has the beneficial effects of the above-disclosed three-phase voltage amplitude detection method.

[0116] See also Figure 7 , Figure 7 A structural diagram of an electronic device provided by an embodiment of the present invention, the device includes:

[0117] A memory 31, used for storing computer programs;

[0118] The processor 32 is used to implement the steps of the three-phase voltage amplitude detection method disclosed above when executing the computer program.

[0119] An electronic device provided by an embodiment of the present invention has the beneficial effects of the above-disclosed method for detecting the amplitude of a three-phase voltage.

[0120] Accordingly, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of a three-phase voltage amplitude detection method disclosed above are implemented.

[0121] A computer-readable storage medium provided in an embodiment of the present invention has the beneficial effects of the aforementioned three-phase voltage amplitude detection method.

[0122] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0123] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article 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, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0124] The above is a detailed introduction to the amplitude detection method, device, equipment and medium of a three-phase voltage provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for a general technician in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A three-phase voltage amplitude detection method, characterized in that: include: The phase-locked loop is used to phase-lock and track the three-phase voltage; When the phase-locked loop stably tracks the three-phase voltage, the phase output of the phase-locked loop to the three-phase voltage is acquired to obtain the phase information of the three-phase voltage; Determine the phase interval of the three-phase voltage according to the phase information of the three-phase voltage, perform positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and filter the target processing information to obtain target filtering information; The amplitudes of the three-phase voltages are determined according to the target screening information.

2. A three-phase voltage amplitude detection method according to claim 1, characterized in that: The determining the phase interval of the three-phase voltage according to the phase information of the three-phase voltage, performing positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and screening the target processing information to obtain target screening information, includes: In the first phase interval or the second phase interval, a positive value processing is performed on the A phase voltage in the three-phase voltage to obtain A phase processing information; In the third phase interval or the fourth phase interval, a B-phase voltage in the three-phase voltage is processed to take a positive value to obtain B-phase processing information; In the fifth phase interval or the sixth phase interval, the C phase voltage in the three-phase voltage is processed to take a positive value to obtain C phase processing information; wherein the first phase interval, the second phase interval, the third phase interval, the fourth phase interval, the fifth phase interval and the sixth phase interval are all phase intervals determined according to the phase information of the three-phase voltage; The A-phase processing information, the B-phase processing information, and the C-phase processing information are respectively screened for the maximum voltage to obtain the A-phase screening information, the B-phase screening information, and the C-phase screening information.

3. A three-phase voltage amplitude detection method according to claim 2, characterized in that: The determining the amplitude of the three-phase voltage according to the target screening information includes: According to the phase corresponding to the A-phase filtering information, the phase corresponding to the B-phase filtering information and the phase corresponding to the C-phase filtering information, the amplitude of the A-phase voltage, the amplitude of the B-phase voltage and the amplitude of the C-phase voltage in the three-phase voltage are respectively obtained.

4. A three-phase voltage amplitude detection method according to claim 1, characterized in that: The method of performing phase-locked tracking on the three-phase voltage by using a phase-locked loop comprises: Performing Clark transformation and Park transformation on the three-phase voltage to obtain a voltage signal of the three-phase voltage on the Q axis of a two-phase rotating coordinate system, thereby obtaining a Q axis voltage signal; The phase-locked loop is used to perform phase-locked tracking on the Q-axis voltage signal.

5. A three-phase voltage amplitude detection method according to claim 4, characterized in that: When the phase-locked loop stably tracks the three-phase voltage, the phase output of the phase-locked loop to the three-phase voltage is obtained to obtain the phase information of the three-phase voltage, including: When the Q-axis voltage signal is within a preset range, it is determined that the phase-locked loop stably tracks the three-phase voltage; The phase output of the phase-locked loop to the Q-axis voltage signal is obtained according to the zero-static-error tracking control principle to obtain the phase information of the three-phase voltage.

6. A three-phase voltage amplitude detection method according to claim 5, characterized in that: The method of obtaining the phase output of the phase-locked loop to the Q-axis voltage signal according to the zero-static-error tracking control principle to obtain the phase information of the three-phase voltage includes: The phase information of the three-phase voltage is obtained by processing the phase output of the Q-axis voltage signal using the proportional-integral controller and the integral controller in the phase-locked loop.

7. A three-phase voltage amplitude detection method according to claim 1, characterized in that: The three-phase voltage is the three-phase voltage output by the power grid or the three-phase voltage output by the renewable energy power generation system via an inverter; the renewable energy power generation system includes a photovoltaic power generation device, an energy storage device and a wind power generation device.

8. A three-phase voltage amplitude detection device, characterized in that: include: A phase-locked tracking module is used to perform phase-locked tracking of three-phase voltage using a phase-locked loop; A phase acquisition module, used for acquiring the phase output of the phase-locked loop to the three-phase voltage when the phase-locked loop stably tracks the three-phase voltage, so as to obtain the phase information of the three-phase voltage; an information processing module, configured to determine a phase interval of the three-phase voltage according to the phase information of the three-phase voltage, perform positive value processing on the three-phase voltage within the phase interval of the three-phase voltage to obtain target processing information, and filter the target processing information to obtain target filtering information; An amplitude determination module is used to determine the amplitude of the three-phase voltage according to the target screening information.

9. An electronic device, characterized in that: include: Memory for storing computer programs; A processor, configured to implement the steps of a three-phase voltage amplitude detection method as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of a three-phase voltage amplitude detection method as described in any one of claims 1 to 7 are implemented.

Images