Electric energy metering method and system, storage medium and product

Abstract

The invention provides an electric energy metering method and system, a storage medium and a product, and belongs to the technical field of electric energy metering. The method comprises the following steps: acquiring a single-phase instantaneous voltage signal and a single-phase instantaneous current signal corresponding to each sampling point of a single-phase power grid; determining single-phase instantaneous power according to the single-phase instantaneous voltage signal and the single-phase instantaneous current signal; determining a zero crossing point of a voltage fundamental wave signal in the single-phase instantaneous voltage signal; calculating the number of instantaneous sampling points in the time period of two adjacent zero crossing points; determining a single-phase power average value according to the instantaneous sampling point number and the single-phase instantaneous power in the time period of two adjacent zero crossing points; and performing electric energy integration on the single-phase power average value to obtain single-phase electric energy and a single-phase electric energy pulse. By means of the method, it can be avoided that a low-pass filter in the prior art is used for filtering alternating components in the power signals, electric energy loss is reduced, and the problem that in the prior art, electric energy loss is too much is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of electric energy metering, and in particular, relates to an electric energy metering method, system, storage medium and product. Background Art

[0002] In the case of rapid changes in the power grid flow, the direction and size of instantaneous power transmission in the power system change frequently. With the charging of electric vehicles, industrial production load switching or changes in residential electricity demand, the power demand of each node in the power grid will increase or decrease instantly. In particular, when renewable energy such as solar energy and wind energy are connected to the power grid, the power generation power will be greater than the load power, which will cause the power grid flow to change. The rapid changes in the power grid flow have an important impact on the stability and efficiency of the power system, so efficient metering methods are needed to adapt to and monitor changes.

[0003] However, when the power grid changes rapidly, the traditional method uses a low-pass filter to filter out the AC component in the power signal, resulting in excessive power loss and unable to meet the State Grid's requirements for power loss caused by rapid changes in power grid trends. Summary of the invention

[0004] The purpose of this application is to provide an electric energy metering method, system, storage medium and product, aiming to solve the problem of excessive electric energy loss in traditional technologies.

[0005] The present application provides an electric energy metering method, comprising:

[0006] Obtaining the single-phase instantaneous voltage signal and the single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid;

[0007] Determining single-phase instantaneous power according to the single-phase instantaneous voltage signal and the single-phase instantaneous current signal;

[0008] Determining a zero-crossing point of a voltage fundamental wave signal in the single-phase instantaneous voltage signal;

[0009] Calculate the number of instantaneous sampling points in the time period of two adjacent zero-crossing points;

[0010] In a time period between two adjacent zero-crossing points, determining a single-phase power average value according to the instantaneous sampling point number and the single-phase instantaneous power;

[0011] The single-phase power average value is integrated to obtain single-phase power and single-phase power pulses.

[0012] In one embodiment, determining the single-phase power average value according to the instantaneous sampling points and the single-phase instantaneous power in the time period of two adjacent zero-crossing points includes:

[0013] In a time period between two adjacent zero-crossing points corresponding to the voltage fundamental signal in the first-phase instantaneous voltage signal, determining the first-phase power average value according to the instantaneous sampling point number and the first-phase instantaneous power;

[0014] The first phase instantaneous power is determined by multiplying the first phase instantaneous voltage signal and the first phase instantaneous current signal by a multiplier.

[0015] In one embodiment, determining the single-phase power average value according to the instantaneous sampling points and the single-phase instantaneous power in the time period of two adjacent zero-crossing points includes:

[0016] In the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the second-phase instantaneous voltage signal, the second-phase power average value is determined according to the instantaneous sampling point number and the second-phase instantaneous power; wherein the second-phase instantaneous power is determined by multiplying the second-phase instantaneous voltage signal and the second-phase instantaneous current signal by the multiplier;

[0017] The electric energy metering method further comprises:

[0018] Adding the first phase power average value and the second phase power average value according to the summer to determine the two-phase power average value;

[0019] The two-phase power average value is integrated with electric energy by an integrator to obtain two-phase electric energy and two-phase electric energy pulses.

[0020] In one embodiment, determining the single-phase power average value according to the instantaneous sampling points and the single-phase instantaneous power in the time period of two adjacent zero-crossing points includes:

[0021] In the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the third-phase instantaneous voltage signal, the third-phase power average value is determined according to the instantaneous sampling point number and the third-phase instantaneous power; wherein the third-phase instantaneous power is determined by multiplying the third-phase instantaneous voltage signal and the third-phase instantaneous current signal by a multiplier;

[0022] The electric energy metering method further comprises:

[0023] The first phase power average value, the second phase power average value and the third phase power average value are added by the summer to determine the combined phase power average value;

[0024] The integrator performs electric energy integration on the combined-phase power average value to obtain combined-phase electric energy and combined-phase electric energy pulses.

[0025] In one embodiment, the electric energy metering method further includes:

[0026] Obtain the instantaneous current signal of the neutral line corresponding to each sampling point of the neutral line;

[0027] Determining the instantaneous power of the neutral line according to the single-phase instantaneous voltage signal and the instantaneous current signal of the neutral line;

[0028] In a time period between two adjacent zero-crossing points, determining a zero-line power average value according to the instantaneous sampling point number and the zero-line instantaneous power;

[0029] The neutral line power average value is subjected to electric energy integration to obtain the neutral line electric energy and the neutral line electric energy pulse.

[0030] In one embodiment, determining the single-phase power average value according to the instantaneous sampling points and the single-phase instantaneous power in the time period of two adjacent zero-crossing points includes:

[0031] In the time period between two adjacent zero-crossing points, the single-phase instantaneous power corresponding to each sampling point is summed according to the summer to obtain the total instantaneous power;

[0032] The total instantaneous power is divided by the number of instantaneous sampling points according to a divider to determine the single-phase power average value.

[0033] In one embodiment, the single-phase electric energy is any one of single-phase full-wave active electric energy, single-phase full-wave reactive electric energy, single-phase full-wave apparent electric energy, single-phase fundamental wave active electric energy, single-phase fundamental wave reactive electric energy and single-phase fundamental wave apparent electric energy.

[0034] The present application provides an electric energy metering system, comprising:

[0035] A signal acquisition module is used to acquire a single-phase instantaneous voltage signal and a single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid;

[0036] An instantaneous power determination module, used to determine the single-phase instantaneous power according to the single-phase instantaneous voltage signal and the single-phase instantaneous current signal;

[0037] A zero-crossing point determination module, used to determine the zero-crossing point of the voltage fundamental wave signal in the single-phase instantaneous voltage signal;

[0038] A sampling point number determination module, used to calculate the instantaneous sampling point number within the time period of two adjacent zero-crossing points;

[0039] A power average value determination module, used to determine the single-phase power average value according to the number of instantaneous sampling points and the single-phase instantaneous power in a time period between two adjacent zero-crossing points;

[0040] The electric energy acquisition module is used to perform electric energy integration on the single-phase power average value to obtain single-phase electric energy and single-phase electric energy pulses.

[0041] The present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned method are implemented.

[0042] The present application provides a computer program product, including a computer program, and when the computer program is executed by a computer, the steps of the above-mentioned method are implemented.

[0043] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0044] The electric energy metering method provided by the present application samples the single-phase instantaneous voltage signal and the single-phase instantaneous current signal of the power grid at high frequency, and determines the single-phase instantaneous power based on the single-phase instantaneous voltage signal and the single-phase instantaneous current signal. In the time period of two adjacent zero crossings, the single-phase power average value is determined according to the number of instantaneous sampling points and the single-phase instantaneous power, and then the half-wave power based on the zero crossing of the fundamental wave is obtained. The energy integration for fast response is realized based on the single-phase power average value, and the single-phase electric energy is obtained. Therefore, the electric energy metering method provided by the present application is based on the zero crossing of the voltage fundamental wave signal, and the half-wave power value between the two zero crossings is obtained, which can achieve fast response and meet the error requirements of rapid changes in the power flow. Through the electric energy metering method provided by the present application, it is possible to avoid using the low-pass filter in the traditional technology to filter out the AC component in the power signal, so that the electric energy loss is reduced, and the electric energy loss requirements of the State Grid for the rapid change of the power grid power flow can be met, and the problem of excessive electric energy loss in the traditional technology is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 This is a schematic diagram of the steps of the electric energy metering method in some embodiments provided in the present application.

[0047] Figure 2 A schematic diagram of the principle structure of an electric energy metering method for a three-phase power grid in some embodiments of the electric energy metering method provided in the present application.

[0048] Figure 3A schematic diagram of the principle structure of an electric energy metering method for single-phase electric energy and neutral line electric energy in a single-phase power grid in some embodiments of the electric energy metering method provided in the present application.

[0049] Figure 4 This is a schematic diagram of the structure of the electric energy metering method in some embodiments provided in this application. DETAILED DESCRIPTION

[0050] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0052] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] See also Figure 1 The present application provides an electric energy metering method, comprising:

[0055] Step S10, obtaining a single-phase instantaneous voltage signal and a single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid;

[0056] Step S20, determining the single-phase instantaneous power according to the single-phase instantaneous voltage signal and the single-phase instantaneous current signal;

[0057] Step S30, determining the zero-crossing point of the voltage fundamental wave signal in the single-phase instantaneous voltage signal;

[0058] Step S40, calculating the number of instantaneous sampling points in the time period between two adjacent zero-crossing points;

[0059] Step S50, determining the single-phase power average value according to the number of instantaneous sampling points and the single-phase instantaneous power in the time period between two adjacent zero-crossing points;

[0060] Step S60, integrating the single-phase power average value to obtain single-phase power and single-phase power pulses.

[0061] In this embodiment, the single-phase power grid can be phase A, phase B, or phase C. Figure 2 As shown in . One sampling point corresponds to a set of single-phase instantaneous voltage signals and single-phase instantaneous current signals. Single-phase instantaneous power can be understood as the instantaneous power corresponding to a single phase. Single-phase instantaneous voltage signals and single-phase instantaneous current signals are sampled from the power grid in real time at high frequency. The single-phase instantaneous voltage signal and single-phase instantaneous current signal corresponding to each sampling point are multiplied to obtain the single-phase instantaneous power.

[0062] Extract the voltage fundamental signal from the single-phase instantaneous voltage signal, and determine the zero-crossing point from the voltage fundamental signal. The time period between two adjacent zero-crossing points can be understood as the positive half-cycle or the negative half-cycle. The number of instantaneous sampling points can be understood as the number of sampling points in the time period between two adjacent zero-crossing points. Furthermore, in the time period between two adjacent zero-crossing points, the number of instantaneous sampling points is used as the divisor, and the sum of the single-phase instantaneous power corresponding to each sampling point is used as the dividend, and the single-phase power average value in the time period between two adjacent zero-crossing points can be obtained. The single-phase power average value can reflect the average level of single-phase power. Single-phase electric energy is the accumulation of the single-phase power average value over time. Furthermore, the electric energy integration of the single-phase power average value can obtain the corresponding single-phase electric energy. Single-phase electric energy pulse can be understood as the single-phase electric energy embodied in the form of pulses.

[0063] The electric energy metering method provided by the present application is to sample the single-phase instantaneous voltage signal and the single-phase instantaneous current signal of the power grid at high frequency, and determine the single-phase instantaneous power based on the single-phase instantaneous voltage signal and the single-phase instantaneous current signal. In the time period of two adjacent zero crossings, the single-phase power average value is determined according to the number of instantaneous sampling points and the single-phase instantaneous power, and then the half-wave power based on the zero crossing of the fundamental wave is obtained. The energy integration for fast response is realized based on the single-phase power average value, and the single-phase electric energy is obtained. Therefore, the electric energy metering method provided by the present application is based on the zero crossing of the voltage fundamental wave signal, and the half-wave power value between the two zero crossings is obtained, which can achieve fast response and meet the error requirements of rapid changes in the power flow. Through the electric energy metering method provided by the present application, it is possible to avoid using the low-pass filter in the traditional technology to filter out the AC component in the power signal, so that the electric energy loss in the metering process is reduced, which can meet the electric energy loss requirements of the State Grid for the rapid change of the power grid power flow, and solve the problem of excessive electric energy loss in the traditional technology.

[0064] In one embodiment, the current circuit repeatedly switches between forward and reverse current flow directions. 正向 5s, t 反向 The total duration is 5s and 4 hours. By using the electric energy metering method provided in this application to calculate electric energy, the electric energy loss accounts for only 0.15%, which can ensure that the total electric energy error is within the allowable range of the standard and meet the national grid's requirements for electric energy loss due to rapid changes in grid currents. Compared with traditional technologies, the electric energy metering method provided in this application can reduce electric energy losses by calculating electric energy, solving the problem of excessive electric energy losses in traditional technologies.

[0065] Furthermore, by calculating electric energy through the electric energy metering method provided in the present application, the power response speed can reach within 30ms, and the electric energy can be responded in time and accurately calculated.

[0066] See also Figure 2 In one embodiment, in step S10, when obtaining the single-phase instantaneous voltage signal and the single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid, they can be obtained through a high-precision and high-sampling frequency voltage transformer and a current transformer, which can ensure that the high voltage and large current in the power grid are accurately converted into small voltage and small current signals suitable for subsequent processing.

[0067] In one embodiment, in step S30, the voltage fundamental wave signal in the single-phase instantaneous voltage signal is extracted according to the fundamental wave filter. The fundamental wave filter can effectively filter out the harmonic components in the signal, retain the fundamental wave signal, separate the fundamental wave component from other higher harmonics, thereby improving the purity and quality of the signal, and accurately determining the zero crossing point of the voltage fundamental wave signal in the single-phase instantaneous voltage signal.

[0068] In one embodiment, in step S40, the number of instantaneous sampling points in the time period of two adjacent zero crossings is calculated according to the counter. The number of sampling points between two zero crossings of the fundamental voltage signal can be calculated by the sampling point counter. The counter has the advantages of accurate counting, fast response speed and high reliability, and can accurately know the number of instantaneous sampling points in the time period of two adjacent zero crossings.

[0069] In one embodiment, step S50, in a time period between two adjacent zero-crossing points, determining the single-phase power average value according to the number of instantaneous sampling points and the single-phase instantaneous power, includes:

[0070] Step S510, determining the first phase power average value according to the number of instantaneous sampling points and the first phase instantaneous power in the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the first phase instantaneous voltage signal;

[0071] The first phase instantaneous power is determined by multiplying the first phase instantaneous voltage signal and the first phase instantaneous current signal by a multiplier.

[0072] In this embodiment, the first-phase instantaneous voltage signal may be the A-phase instantaneous voltage signal. The first-phase instantaneous power may be the A-phase instantaneous power Spl_PA. In the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the first-phase instantaneous voltage signal UA, the first-phase power average value HW_PA can be determined according to the number of instantaneous sampling points and the first-phase instantaneous power. The first-phase instantaneous power is determined by the first-phase instantaneous voltage signal UA and the first-phase instantaneous current signal IA.

[0073] Through the multiplier, it can be ensured that the first-phase instantaneous voltage signal UA and the first-phase instantaneous current signal IA can be multiplied quickly and accurately under high-frequency sampling. The multiplier has the advantages of fast calculation speed, strong parallel processing capability and strong signal processing capability, and can respond in time and accurately calculate the first-phase instantaneous power, so as to realize fast and accurate calculation of electric energy in subsequent steps and reduce electric energy loss.

[0074] In one embodiment, step S50, in a time period between two adjacent zero-crossing points, determining the single-phase power average value according to the number of instantaneous sampling points and the single-phase instantaneous power, includes:

[0075] Step S520, determining the second phase power average value according to the number of instantaneous sampling points and the second phase instantaneous power in the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the second phase instantaneous voltage signal; wherein the second phase instantaneous power is determined by multiplying the second phase instantaneous voltage signal and the second phase instantaneous current signal by a multiplier;

[0076] In this embodiment, the second-phase instantaneous voltage signal may be the B-phase instantaneous voltage signal. The second-phase instantaneous power may be the B-phase instantaneous power Spl_PB. In the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the second-phase instantaneous voltage signal UB, the second-phase power average value HW_PB can be determined according to the number of instantaneous sampling points and the second-phase instantaneous power. The second-phase instantaneous power is determined by the second-phase instantaneous voltage signal UB and the second-phase instantaneous current signal IB.

[0077] Through the multiplier, the second-phase instantaneous voltage signal UA can be multiplied with the second-phase instantaneous current signal IA. The multiplier has the advantages of fast calculation speed, strong parallel processing capability and strong signal processing capability, and can respond in time and accurately calculate the second-phase instantaneous power, so as to realize fast and accurate calculation of electric energy in subsequent steps and reduce electric energy loss.

[0078] In one embodiment, the electric energy metering method further includes:

[0079] Step S710, adding the first phase power average value and the second phase power average value according to the summer to determine the two-phase power average value;

[0080] Step S810, performing electric energy integration on the two-phase power average value according to the integrator to obtain two-phase electric energy and two-phase electric energy pulses.

[0081] In this embodiment, the first phase power average value can be calculated and obtained by step S510. The second phase power average value can be calculated and obtained by step S520. In step S710, the first phase power average value and the second phase power average value are added to obtain the two-phase power average value. The two-phase power average value can reflect the average level of the two-phase power. The two-phase electric energy is the accumulation of the two-phase power average value over time. Then, the two-phase power average value is integrated to obtain the two-phase electric energy.

[0082] Through step S710 and step S810, the calculation of two-phase electric energy is realized. The electric energy metering method provided by the present application obtains the half-wave power value between two zero-crossing points based on the zero-crossing point of the voltage fundamental signal, and obtains the corresponding two-phase power average value based on the half-wave power value. Furthermore, the electric energy integration of the two-phase power average value can achieve a fast response, meet the error requirements of rapid changes in the current, and help to accurately monitor the energy consumption of equipment such as loads or power grids, as well as detect and locate faults.

[0083] In one embodiment, step S50, in a time period between two adjacent zero-crossing points, determining the single-phase power average value according to the number of instantaneous sampling points and the single-phase instantaneous power, includes:

[0084] Step S530, determining the third-phase power average value according to the number of instantaneous sampling points and the third-phase instantaneous power in the time period between two adjacent zero-crossing points corresponding to the voltage fundamental signal in the third-phase instantaneous voltage signal;

[0085] The third phase instantaneous power is determined by multiplying the third phase instantaneous voltage signal and the third phase instantaneous current signal by a multiplier;

[0086] In this embodiment, the third-phase instantaneous voltage signal may be a C-phase instantaneous voltage signal. The third-phase instantaneous power may be a C-phase instantaneous power Spl_PC. In the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the third-phase instantaneous voltage signal UC, the third-phase power average value HW_PC can be determined according to the number of instantaneous sampling points and the third-phase instantaneous power. The third-phase instantaneous power is determined by the third-phase instantaneous voltage signal UC and the third-phase instantaneous current signal IC.

[0087] Through the multiplier, the third-phase instantaneous voltage signal UC can be multiplied with the third-phase instantaneous current signal IC. The multiplier has the advantages of fast calculation speed, strong parallel processing capability and strong signal processing capability, and can respond in time and accurately calculate the third-phase instantaneous power, so as to realize fast and accurate calculation of electric energy in subsequent steps and reduce electric energy loss.

[0088] In one embodiment, the electric energy metering method further includes:

[0089] Step S720, adding the first phase power average value, the second phase power average value and the third phase power average value according to the summer to determine the combined phase power average value;

[0090] Step S820, performing electric energy integration on the average value of the combined-phase power according to the integrator to obtain the combined-phase electric energy and the combined-phase electric energy pulse.

[0091] In this embodiment, the first phase power average value can be calculated and obtained by step S510. The second phase power average value can be calculated and obtained by step S520. The third phase power average value is calculated and obtained by step S530. Through step S720, the first phase power average value, the second phase power average value and the third phase power average value are added to obtain the combined power average value HW_PT. The combined power average value HW_PT can reflect the average level of the combined power. The combined electric energy is the accumulation of the combined power average value HW_PT over time. Furthermore, the combined power average value HW_PT is integrated with electric energy to obtain the combined electric energy.

[0092] Through step S720 and step S820, the calculation of the combined phase electric energy is realized. The electric energy metering method provided by the present application obtains the half-wave power value between two zero crossing points based on the zero crossing point of the voltage fundamental signal, and obtains the corresponding combined phase power average value based on the half-wave power value. Furthermore, by performing electric energy integration on the combined phase power average value, it is possible to achieve a fast response to obtain the combined phase electric energy, meet the error requirements of rapid changes in the current, and help to accurately monitor the energy consumption of equipment such as loads or power grids, as well as detect and locate faults.

[0093] See also Figure 3 In one embodiment, the electric energy metering method further includes:

[0094] Step S910, obtaining the instantaneous current signal of the neutral line corresponding to each sampling point of the neutral line;

[0095] Step S920, determining the neutral line instantaneous power according to the single-phase instantaneous voltage signal and the neutral line instantaneous current signal;

[0096] Step S930, determining the average value of the zero line power according to the number of instantaneous sampling points and the zero line instantaneous power in the time period between two adjacent zero crossing points;

[0097] Step S940, performing electric energy integration on the average value of the neutral line power to obtain the neutral line electric energy and the neutral line electric energy pulse.

[0098] In this embodiment, the instantaneous current signal In of the zero line corresponding to each sampling point of the zero line is obtained in step S910, and the single-phase instantaneous voltage signal and the single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid are obtained in step S10, which are performed synchronously, and thus have the same number of sampling points. In step S920, the voltage signal corresponding to each sampling point of the zero line is the same as the single-phase instantaneous voltage signal. Furthermore, the instantaneous power Spl_Pn of the zero line can be obtained by multiplying the single-phase instantaneous voltage signal and the instantaneous current signal In of the zero line. The instantaneous power Spl_Pn of the zero line can be understood as the instantaneous power corresponding to the zero line. In step S930, in the time period of two adjacent zero crossing points, the number of instantaneous sampling points is used as the divisor, and the sum of the instantaneous powers of the zero line corresponding to each sampling point is used as the dividend, and the average power HW_Pn of the zero line in the time period of two adjacent zero crossing points can be obtained. The average power HW_Pn of the zero line can reflect the average level of the power of the zero line. The electric energy of the zero line is the accumulation of the average power HW_Pn of the zero line over time. Furthermore, by performing electric energy integration on the neutral line power average value HW_Pn, the neutral line electric energy can be obtained.

[0099] Therefore, the electric energy metering method provided by the present application is based on the zero-crossing point of the voltage fundamental signal, and the half-wave power value between the two zero-crossing points is obtained to obtain the average power value of the zero line. And the energy integration with the average power value of the zero line is used as the source to achieve fast response, and the zero line electric energy is obtained, which can achieve fast response and meet the error requirements of rapid changes in power flow. Through the electric energy metering method provided by the present application, it is possible to avoid using the low-pass filter in the traditional technology to filter out the AC component in the power signal, so that the zero line electric energy loss is reduced, and the electric energy loss requirements of the State Grid for rapid changes in power grid power flow can be met, solving the problem of excessive electric energy loss in traditional technology. Through the electric energy metering method provided by the present application, the zero line electric energy is accurately calculated, and the three-phase imbalance and fault detection and diagnosis can be monitored to ensure the normal operation of the load.

[0100] In one embodiment, step S50, in a time period between two adjacent zero-crossing points, determining the single-phase power average value according to the number of instantaneous sampling points and the single-phase instantaneous power, includes:

[0101] Step S501, in the time period between two adjacent zero-crossing points, the single-phase instantaneous power corresponding to each sampling point is summed according to a summer to obtain the total instantaneous power;

[0102] Step S502: dividing the total instantaneous power by the number of instantaneous sampling points using a divider to determine the average value of the single-phase power.

[0103] In this embodiment, each sampling point corresponds to a group of single-phase instantaneous voltage signals and single-phase instantaneous current signals in the time period of two adjacent zero crossings. Furthermore, each sampling point corresponds to a single-phase instantaneous power. In the time period of two adjacent zero crossings, each single-phase instantaneous power is added according to the summator to obtain the total instantaneous power. Furthermore, the total instantaneous power is used as the dividend and the number of instantaneous sampling points is used as the divisor to calculate the single-phase power average value. Through the summator, it is possible to sum the single-phase instantaneous power corresponding to each sampling point in the time period of two adjacent zero crossings. Through the divider, it is possible to divide the total instantaneous power by the number of instantaneous sampling points. The summator and the divider have the advantages of high calculation accuracy, fast calculation speed and low power consumption, and can respond in time and accurately calculate the total instantaneous power and the single-phase power average value, so as to realize the rapid and accurate calculation of electric energy in the subsequent steps and reduce the electric energy loss.

[0104] In one embodiment, the single-phase electric energy is any one of single-phase full-wave active electric energy, single-phase full-wave reactive electric energy, single-phase full-wave apparent electric energy, single-phase fundamental wave active electric energy, single-phase fundamental wave reactive electric energy and single-phase fundamental wave apparent electric energy.

[0105] In this embodiment, the electric energy metering method provided by the present application can realize the calculation of any one of the single-phase full-wave active electric energy, the single-phase full-wave reactive electric energy, the single-phase full-wave apparent electric energy, the single-phase fundamental wave active electric energy, the single-phase fundamental wave reactive electric energy and the single-phase fundamental wave apparent electric energy. Furthermore, the electric energy metering method provided by the present application has wide applicability and can be applied to various different scenarios.

[0106] Furthermore, similarly, according to step S720 and step S820, the calculation of any one of the total-phase full-wave active energy, the total-phase full-wave reactive energy, the total-phase full-wave apparent energy, the total-phase fundamental wave active energy, the total-phase fundamental wave reactive energy and the total-phase fundamental wave apparent energy can also be realized.

[0107] In one embodiment, in step S10, the single-phase instantaneous voltage signal and the single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid are obtained. If the single-phase instantaneous voltage signal and the single-phase instantaneous current signal are full-wave signals, the calculation of single-phase full-wave active electric energy, single-phase full-wave reactive electric energy and single-phase full-wave apparent electric energy can be realized.

[0108] In one embodiment, in step S10, the single-phase instantaneous voltage signal and the single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid are obtained. If the single-phase instantaneous voltage signal and the single-phase instantaneous current signal are fundamental wave signals, the calculation of single-phase fundamental wave active electric energy, single-phase fundamental wave reactive electric energy and single-phase fundamental wave apparent electric energy can be realized.

[0109] By obtaining different types of single-phase instantaneous voltage signals and single-phase instantaneous current signals in step S10, different types of electric energy and electric energy pulses can be obtained accordingly, which can be adjusted according to actual application scenarios.

[0110] See also Figure 4 The present application provides an electric energy metering system 100. The electric energy metering system 100 includes a signal acquisition module 10, an instantaneous power determination module 20, a zero-crossing point determination module 30, a sampling point number determination module 40, a power average value determination module 50, and an electric energy acquisition module 60. The signal acquisition module 10 is used to obtain a single-phase instantaneous voltage signal and a single-phase instantaneous current signal corresponding to each sampling point of a single-phase power grid. The instantaneous power determination module 20 is used to determine the single-phase instantaneous power according to the single-phase instantaneous voltage signal and the single-phase instantaneous current signal.

[0111] The zero-crossing point determination module 30 is used to determine the zero-crossing point of the voltage fundamental signal in the single-phase instantaneous voltage signal. The sampling point number determination module 40 is used to calculate the number of instantaneous sampling points in the time period between two adjacent zero-crossing points. The power average value determination module 50 is used to determine the single-phase power average value according to the instantaneous sampling point number and the single-phase instantaneous power in the time period between two adjacent zero-crossing points. The electric energy acquisition module 60 is used to perform electric energy integration on the single-phase power average value to obtain single-phase electric energy and single-phase electric energy pulses.

[0112] In this embodiment, the relevant description of the signal acquisition module 10 can refer to the relevant description of step S10 in the above embodiment. The relevant description of the instantaneous power determination module 20 can refer to the relevant description of step S20 in the above embodiment. The relevant description of the zero-crossing determination module 30 can refer to the relevant description of step S30 in the above embodiment. The relevant description of the sampling point determination module 40 can refer to the relevant description of step S40 in the above embodiment. The relevant description of the power average value determination module 50 can refer to the relevant description of step S50 in the above embodiment. The relevant description of the electric energy acquisition module 60 can refer to the relevant description of step S60 in the above embodiment.

[0113] The present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the method in any one of the above embodiments are implemented.

[0114] The present application provides a computer program product, including a computer program. When the computer program is executed by a computer, the steps of the method in any one of the above embodiments are implemented.

[0115] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0116] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0117] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0118] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0119] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0120] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0121] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0122] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0123] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for measuring electric energy, characterized in that: include: Obtaining the single-phase instantaneous voltage signal and the single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid; Determining single-phase instantaneous power according to the single-phase instantaneous voltage signal and the single-phase instantaneous current signal; Determining a zero-crossing point of a voltage fundamental wave signal in the single-phase instantaneous voltage signal; Calculate the number of instantaneous sampling points in the time period of two adjacent zero-crossing points; In a time period between two adjacent zero-crossing points, determining a single-phase power average value according to the instantaneous sampling point number and the single-phase instantaneous power; The single-phase power average value is integrated to obtain single-phase power and single-phase power pulses.

2. The electric energy metering method according to claim 1, characterized in that: Determining the single-phase power average value according to the instantaneous sampling point number and the single-phase instantaneous power in the time period of two adjacent zero-crossing points includes: In a time period between two adjacent zero-crossing points corresponding to the voltage fundamental signal in the first-phase instantaneous voltage signal, determining the first-phase power average value according to the instantaneous sampling point number and the first-phase instantaneous power; The first phase instantaneous power is determined by multiplying the first phase instantaneous voltage signal and the first phase instantaneous current signal by a multiplier.

3. The electric energy metering method according to claim 2, characterized in that: Determining the single-phase power average value according to the instantaneous sampling point number and the single-phase instantaneous power in the time period of two adjacent zero-crossing points includes: In the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the second-phase instantaneous voltage signal, the second-phase power average value is determined according to the instantaneous sampling point number and the second-phase instantaneous power; wherein the second-phase instantaneous power is determined by multiplying the second-phase instantaneous voltage signal and the second-phase instantaneous current signal by the multiplier; The electric energy metering method further comprises: Adding the first phase power average value and the second phase power average value according to the summer to determine the two-phase power average value; The two-phase power average value is integrated with electric energy by an integrator to obtain two-phase electric energy and two-phase electric energy pulses.

4. The electric energy metering method according to claim 3, characterized in that: Determining the single-phase power average value according to the instantaneous sampling point number and the single-phase instantaneous power in the time period of two adjacent zero-crossing points includes: In the time period of two adjacent zero-crossing points corresponding to the voltage fundamental signal in the third-phase instantaneous voltage signal, the third-phase power average value is determined according to the instantaneous sampling point number and the third-phase instantaneous power; wherein the third-phase instantaneous power is determined by multiplying the third-phase instantaneous voltage signal and the third-phase instantaneous current signal by a multiplier; The electric energy metering method further comprises: The first phase power average value, the second phase power average value and the third phase power average value are added by the summer to determine the combined phase power average value; The integrator performs electric energy integration on the combined-phase power average value to obtain combined-phase electric energy and combined-phase electric energy pulses.

5. The electric energy metering method according to claim 1, characterized in that: The electric energy metering method further includes: Obtain the instantaneous current signal of the neutral line corresponding to each sampling point of the neutral line; Determining the instantaneous power of the neutral line according to the single-phase instantaneous voltage signal and the instantaneous current signal of the neutral line; In a time period between two adjacent zero-crossing points, determining a zero-line power average value according to the instantaneous sampling point number and the zero-line instantaneous power; The neutral line power average value is subjected to electric energy integration to obtain the neutral line electric energy and the neutral line electric energy pulse.

6. The electric energy metering method according to any one of claims 1 to 5, characterized in that: Determining the single-phase power average value according to the instantaneous sampling point number and the single-phase instantaneous power in the time period of two adjacent zero-crossing points includes: In the time period between two adjacent zero-crossing points, the single-phase instantaneous power corresponding to each sampling point is summed according to the summer to obtain the total instantaneous power; The total instantaneous power is divided by the number of instantaneous sampling points according to a divider to determine the single-phase power average value.

7. The electric energy metering method according to any one of claims 1 to 5, characterized in that: The single-phase electric energy is any one of single-phase full-wave active electric energy, single-phase full-wave reactive electric energy, single-phase full-wave apparent electric energy, single-phase fundamental wave active electric energy, single-phase fundamental wave reactive electric energy and single-phase fundamental wave apparent electric energy.

8. An electric energy metering system, characterized in that: include: A signal acquisition module is used to acquire a single-phase instantaneous voltage signal and a single-phase instantaneous current signal corresponding to each sampling point of the single-phase power grid; An instantaneous power determination module, used to determine the single-phase instantaneous power according to the single-phase instantaneous voltage signal and the single-phase instantaneous current signal; A zero-crossing point determination module, used to determine the zero-crossing point of the voltage fundamental wave signal in the single-phase instantaneous voltage signal; A sampling point number determination module, used to calculate the instantaneous sampling point number within the time period of two adjacent zero-crossing points; A power average value determination module, used to determine the single-phase power average value according to the instantaneous sampling points and the single-phase instantaneous power in a time period between two adjacent zero-crossing points; The electric energy acquisition module is used to perform electric energy integration on the single-phase power average value to obtain single-phase electric energy and single-phase electric energy pulses.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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

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