CN117388569B - Electric energy metering method, electric energy metering box and medium under waveform distortion of power grid - Google Patents
Electric energy metering method, electric energy metering box and medium under waveform distortion of power grid Download PDFInfo
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Abstract
The invention discloses an electric energy metering method, an electric energy metering box and a medium under waveform distortion of a power grid, which comprise the following steps: acquiring a three-phase current/voltage waveform signal of a power consumer; respectively carrying out continuous discrete acquisition on three-phase current/voltage waveform signals according to a preset sampling frequency to obtain a current/voltage discrete point set; calculating the slope between adjacent discrete points of a current/voltage discrete point set according to the time sequence, and dividing a three-phase current/voltage waveform signal into a mutation area and a gradual change area; decomposing the three-phase current/voltage waveform signals of the gradual change region into fundamental wave signals and harmonic signals, and calculating an electric energy metering result of the gradual change region; reconstructing three-phase current/voltage waveform signals of the abrupt region by taking the fundamental wave signals and the harmonic wave signals as ideal waveform signals to obtain reconstructed waveforms of the three-phase current/voltage waveform signals of the abrupt region, and calculating an electric energy metering result of the abrupt region; and the electric energy metering is realized. According to the invention, the electric energy is calculated by partition, so that the electric energy metering precision is effectively improved.
Description
Technical Field
The invention relates to the technical field of electric energy metering, in particular to an electric energy metering method, an electric energy metering box and a medium under waveform distortion of a power grid.
Background
With the development of economy and the rapid increase of national power demand, how to realize accurate metering while ensuring safe and reliable power supply is the primary task at present. The electric energy meter is used as a standard electric energy metering device, and whether the metering is accurate or not is related to the tangential interests of power grid companies and electricity users.
The existing reasons for abnormal metering of electric energy can be divided into faults of metering devices, waveform interference in a power system and illegal electricity larceny, wherein the waveform interference in the power system is caused by the fact that more and more power electronic devices, fluctuation power sources and fluctuation loads in a power grid are widely used in the power system, and accordingly, the problems of harmonic waves and inter-harmonic waves are increasingly remarkable.
In the traditional mode, a full electric energy metering mode is adopted, and the total electric energy is calculated by directly multiplying and integrating sampling values of time domain voltage and current signals according to electric energy definition, so that errors exist between electric energy metering and actual electric energy consumption. The existing factors for adjusting the electric energy metering aiming at the waveform distortion of the power grid only stay on harmonic waves and inter-harmonic waves, and a large number of production equipment with power electronic phase-change devices are included in industrial production, the equipment generates harmonic waves and notches at the same time when in operation, the existing electric energy metering does not consider the influence of the notches in the power grid on the electric energy metering, and therefore an electric energy metering method still needs to be improved.
Disclosure of Invention
In order to solve the problems, the technical scheme provided by the invention is as follows:
a method of metering electrical energy under grid waveform distortion, comprising:
acquiring a three-phase current waveform signal and a three-phase voltage waveform signal of a power consumer; respectively carrying out continuous discrete acquisition on the three-phase current waveform signal and the three-phase voltage waveform signal according to a preset sampling frequency to obtain a current discrete point set and a voltage discrete point set;
respectively calculating slopes between adjacent discrete points of the current discrete point set and the voltage discrete point set according to time sequences, and respectively dividing the three-phase current waveform signal and the three-phase voltage waveform signal into a mutation area and a gradual change area according to a slope calculation result;
decomposing the three-phase current waveform signal and the three-phase voltage waveform signal of the gradual change region into fundamental wave signals and harmonic signals respectively so as to calculate an electric energy metering result of the gradual change region;
reconstructing the three-phase current waveform signal and the three-phase voltage waveform signal of the abrupt region by taking the fundamental wave signal and the harmonic wave signal which are obtained by decomposition as ideal waveform signals to obtain reconstructed waveforms of the three-phase current waveform signal and the three-phase voltage waveform signal of the abrupt region so as to calculate an electric energy metering result of the abrupt region;
and according to the electric energy metering result of the gradual change area and the electric energy metering result of the abrupt change area, realizing electric energy metering.
The invention is further arranged to be at a preset sampling frequency f gather Continuously and discretely collecting the three-phase current waveform signals to obtain a current discrete point set P I (1, 2,., N) at a preset sampling frequency f gather Continuously and discretely collecting the three-phase voltage waveform signals to obtain a voltage discrete point set Q U (1, 2,., N); the current discrete point set P I (1, 2,) N) and the set of voltage discrete points Q U (1, 2,., N) the discrete points are arranged in time sequence;
traversing the set of current discrete points P I (1, 2,., N) slopes between two adjacent points, resulting in a slope set k I (1, 2,..n-1) traversing the set of voltage discrete points Q U (1, 2,., N) slopes between two adjacent points, resulting in a slope set k U (1,2,...,N-1)；
Comparing the slope set k I The method comprises the steps of (1, 2.. N-1) determining a sudden change starting current discrete point and a sudden change ending current discrete point according to preset slope sudden change values, and dividing the three-phase current waveform signals into a three-phase current sudden change region and a three-phase current gradual change region according to the sudden change starting current discrete point and the sudden change ending current discrete point;
comparing the slope set k U The method comprises the steps of (1, 2, wherein the change amplitude of adjacent slopes in the step (N-1)) is used for determining a sudden change starting voltage discrete point and a sudden change ending voltage discrete point according to a preset slope sudden change value, and dividing the three-phase voltage waveform signal into three-phase voltages according to the sudden change starting voltage discrete point and the sudden change ending voltage discrete pointAbrupt regions and three-phase voltage transition regions.
The invention is further arranged to compare said slope set k I The method comprises the steps of (1, 2,) segmenting the three-phase current waveform signal according to the change amplitude of adjacent slopes in the N-1), and obtaining fundamental wave frequency and harmonic frequency of the three-phase current gradient region by adopting a spectrum estimation method or a synchrophasor measurement method;
comparing the slope set k U And (1, 2.. The amplitude of the change of the adjacent slope in the N-1) is segmented according to a preset slope gain value, and a spectrum estimation method or a synchrophasor measurement method is adopted to obtain the fundamental frequency and the harmonic frequency of the three-phase voltage gradient region.
The invention is further arranged to divide a current filtering frequency band according to fundamental wave frequency and harmonic frequency of the three-phase current waveform, design a plurality of current frequency band filters covering the current filtering frequency band range, and filter the three-phase current gradual change region by adopting the current frequency band filters to obtain a current fundamental wave signal and a current harmonic wave signal; dividing a voltage filtering frequency band according to fundamental wave frequency and harmonic frequency of the three-phase voltage waveform, designing a plurality of voltage frequency band filters covering the voltage filtering frequency band range, and respectively filtering the three-phase voltage gradual change region by adopting the voltage frequency band filters to obtain a voltage fundamental wave signal and a voltage harmonic wave signal; and calculating an electric energy metering result of the gradual change region according to the current fundamental wave signal, the current harmonic wave signal, the voltage fundamental wave signal and the voltage harmonic wave signal.
The invention is further arranged to fill waveforms of the current fundamental wave signals and the current harmonic signals corresponding to the three-phase current abrupt change areas, and as current ideal waveform signals, extract current fundamental wave characteristics and current harmonic characteristics of the current ideal waveform signals, and correct the three-phase current waveform signals of the three-phase current abrupt change areas by utilizing the current fundamental wave characteristics and the current harmonic characteristics; filling waveforms of the voltage fundamental wave signals and the voltage harmonic signals corresponding to the three-phase voltage abrupt change areas, extracting voltage fundamental wave characteristics and voltage harmonic characteristics of the voltage ideal waveform signals as voltage ideal waveform signals, and correcting the three-phase voltage waveform signals of the three-phase voltage abrupt change areas by utilizing the voltage fundamental wave characteristics and the voltage harmonic characteristics.
The invention is further arranged that the current fundamental wave characteristic is a current fundamental wave amplitude characteristic, and the current harmonic wave characteristic is a current harmonic wave amplitude characteristic; the voltage fundamental wave characteristic is voltage fundamental wave amplitude characteristic, and the voltage harmonic wave characteristic is voltage harmonic wave amplitude characteristic.
The invention is further arranged to obtain the average value of the three-phase current waveform signals of the three-phase current abrupt change region, and record the average value as a first amplitude A 1 Calculating the average value of the current fundamental wave amplitude characteristic and the current harmonic amplitude characteristic, and recording the average value as a second amplitude A 2 Calculating an amplitude correction coefficient Z 1 Amplitude correction factor Z 1 =（A 1 +A 2 ）/A 1 By using the amplitude correction coefficient Z 1 Correcting the three-phase current waveform signal of the three-phase current abrupt change region; acquiring an average value of the three-phase voltage waveform signals of the three-phase voltage abrupt change region, and recording the average value as a third amplitude A 3 Calculating the average value of the fundamental current amplitude characteristic and the harmonic current amplitude characteristic, and recording the average value as a fourth amplitude A 4 Calculating an amplitude correction coefficient Z 2 Amplitude correction factor Z 2 =（A 3 +A 4 ）/A 3 By using the amplitude correction coefficient Z 2 And correcting the three-phase voltage waveform signal of the three-phase voltage abrupt change region.
The method is further arranged to acquire the corrected three-phase current waveform signal of the three-phase current abrupt change region and the corrected three-phase voltage waveform signal of the three-phase voltage abrupt change region, and calculate an electric energy metering result of the abrupt change region; and summing the electric energy metering result of the abrupt change region and the electric energy metering result of the gradual change region to realize electric energy metering.
An electrical energy metering box comprising a controller, the controller comprising a processor and a memory, the memory storing at least one computer program which, when executed by the processor, performs an electrical energy metering method under power grid waveform distortion as described above.
A storage medium storing computer instructions for causing a processor to perform a method of metering electrical energy under distortion of a grid waveform as described above.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
according to the technical scheme, the electric energy metering method aims at the operation of the phase conversion equipment to enable the trapped wave and the nonlinear load to be generated in the power grid to enable the electric energy compensation calculation of the harmonic wave to be generated in the power grid, the voltage waveform and the current waveform in the three-phase power grid are partitioned, the waveform of the gradual change region is decomposed, the electric energy metering result of the gradual change region is calculated, the waveform decomposition result of the gradual change region is taken as an ideal waveform signal, the voltage waveform and the current waveform in the abrupt change region are corrected, the electric energy metering result in the abrupt change region is calculated, and the electric energy metering results of the gradual change region and the abrupt change region are summed to finish electric energy metering under the condition of waveform distortion of the power grid.
According to the invention, the electric energy is calculated by the partition, the waveform of the gradual change region is utilized to correct the waveform of the abrupt change region, the metering accuracy of the electric energy of the power grid under the distortion condition is effectively improved, the electric energy metering is more approximate to the actual electricity consumption condition, and the real-time performance is better.
Drawings
Fig. 1 is a flowchart of an electric energy metering method under waveform distortion of a power grid according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a controller in an electric energy meter box according to embodiment 2 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
With reference to fig. 1, the technical scheme of the invention is an electric energy metering method under waveform distortion of a power grid, comprising the following steps:
s100, acquiring a three-phase current waveform signal and a three-phase voltage waveform signal of a power consumer; respectively carrying out continuous discrete acquisition on the three-phase current waveform signal and the three-phase voltage waveform signal according to a preset sampling frequency to obtain a current discrete point set and a voltage discrete point set;
s200, calculating slopes between adjacent discrete points of the current discrete point set and the voltage discrete point set according to time sequence, and dividing the three-phase current waveform signal and the three-phase voltage waveform signal into a mutation area and a gradual change area according to a slope calculation result;
s300, respectively decomposing the three-phase current waveform signal and the three-phase voltage waveform signal of the gradual change region into fundamental wave signals and harmonic signals so as to calculate an electric energy metering result of the gradual change region;
s400, reconstructing the three-phase current waveform signal and the three-phase voltage waveform signal of the abrupt region by taking the fundamental wave signal and the harmonic wave signal which are obtained by decomposition as ideal waveform signals to obtain reconstructed waveforms of the three-phase current waveform signal and the three-phase voltage waveform signal of the abrupt region so as to calculate an electric energy metering result of the abrupt region;
s500, according to the electric energy metering result of the gradual change area and the electric energy metering result of the abrupt change area, electric energy metering is achieved.
In the above embodiment, the three-phase current waveform signal and the three-phase voltage waveform signal have a fundamental wave, a notch, and a notch, wherein a harmonic wave is generated by the presence of a nonlinear load in the power grid, and the notch is generated by the operation of a phase-change device in the power grid, specifically, the periodic disturbance generated when the alternating-current input power is switched from one phase to another phase under the normal working condition of the phase-change device. The abrupt change area is a power grid waveform with a notch waveform, the gradual change area is a power grid waveform except the notch waveform, and the area division is carried out through a slope calculation result.
In the above embodiment, the preset sampling frequency is much greater than 50 hz, and preferably may be 1500 hz to 3000 hz.
In the above embodiment, the distinction between the gradation region and the abrupt region is made by the magnitude of the change in slope between the acquisition points.
In the above embodiment, the electric energy metering method according to the present technical solution is to perform compensation calculation for the electric energy generated by the notch and the nonlinear load generated in the power grid by operating the phase-change device, divide the voltage waveform and the current waveform in the three-phase power grid, decompose the waveform of the gradual change region and calculate the electric energy metering result of the gradual change region, then use the waveform decomposition result of the gradual change region as an ideal waveform signal, de-correct the voltage waveform and the current waveform in the abrupt change region, calculate the electric energy metering result of the abrupt change region, sum the electric energy metering results of the gradual change region and the abrupt change region, and complete the electric energy metering under the condition of waveform distortion of the power grid.
In the present embodiment, the sampling frequency f is preset gather Continuously and discretely collecting the three-phase current waveform signals to obtain a current discrete point set P I (1, 2,., N) at a preset sampling frequency f gather Continuously and discretely collecting the three-phase voltage waveform signals to obtain a voltage discrete point set Q U (1, 2,., N); the current discrete point set P I (1, 2,) N) and the set of voltage discrete points Q U (1, 2,., N) the discrete points are arranged in time sequence;
traversing the set of current discrete points P I (1, 2,., N) slopes between two adjacent points, resulting in a slope set k I (1, 2,..n-1) traversing the set of voltage discrete points Q U (1, 2,., N) slopes between two adjacent points, resulting in a slope set k U (1,2,...,N-1)；
Comparing the slope set k I The magnitude of the change in adjacent slopes in (1, 2,.., N-1), determining a sudden change starting current discrete point and a sudden change ending current discrete point according to a preset slope sudden change value, and powering the three-phase power according to the sudden change starting current discrete point and the sudden change ending current discrete pointThe current waveform signal is divided into a three-phase current abrupt change area and a three-phase current gradual change area;
comparing the slope set k U And (1, 2.. The amplitude of the change of the adjacent slope in the N-1), determining a sudden change starting voltage discrete point and a sudden change ending voltage discrete point according to a preset slope sudden change value, and dividing the three-phase voltage waveform signal into a three-phase voltage sudden change region and a three-phase voltage gradual change region according to the sudden change starting voltage discrete point and the sudden change ending voltage discrete point.
In the above embodiment, for any notch, there are two slope change magnitudes exceeding the preset slope abrupt value. For the odd slope change amplitude, the subsequent current discrete point in the former slope is classified into the three-phase current mutation region, for example, k is when the first slope change amplitude occurs I (150) And k is equal to I (151) If the slope change amplitude exceeds the preset slope abrupt change value, k is determined I (150) The corresponding subsequent current discrete points fall into the three-phase current abrupt change region. For an even number of slope change magnitudes, the previous current discrete point in the latter slope is classified into the three-phase current abrupt region, e.g., k when the second slope change magnitude occurs I (900) And k is equal to I (901) If the slope change amplitude exceeds the preset slope abrupt change value, k is determined I (901) The corresponding previous current discrete points fall into the three-phase current abrupt change region.
In this embodiment, the slope set k is compared I The method comprises the steps of (1, 2,) segmenting the three-phase current waveform signal according to the change amplitude of adjacent slopes in the N-1), and obtaining fundamental wave frequency and harmonic frequency of the three-phase current gradient region by adopting a spectrum estimation method or a synchrophasor measurement method;
comparing the slope set k U And (1, 2.. The amplitude of the change of the adjacent slope in the N-1) is segmented according to a preset slope gain value, and a spectrum estimation method or a synchrophasor measurement method is adopted to obtain the fundamental frequency and the harmonic frequency of the three-phase voltage gradient region.
In the above embodiment, the fundamental frequency and harmonic frequency of the three-phase voltage gradient region obtained by the synchrophasor measurement method can be referred to in chinese patent publication No. CN112485522 a.
In this embodiment, a current filtering band is divided according to the fundamental frequency and harmonic frequency of the three-phase current waveform, a plurality of current band filters covering the current filtering band range are designed, and the three-phase current gradient regions are respectively filtered by the current band filters to obtain a current fundamental wave signal and a current harmonic wave signal;
dividing a voltage filtering frequency band according to fundamental wave frequency and harmonic frequency of the three-phase voltage waveform, designing a plurality of voltage frequency band filters covering the voltage filtering frequency band range, and respectively filtering the three-phase voltage gradual change region by adopting the voltage frequency band filters to obtain a voltage fundamental wave signal and a voltage harmonic wave signal;
and calculating an electric energy metering result of the gradual change region according to the current fundamental wave signal, the current harmonic wave signal, the voltage fundamental wave signal and the voltage harmonic wave signal.
In this embodiment, waveforms of the current fundamental wave signal and the current harmonic wave signal corresponding to the three-phase current abrupt change region are filled up, and are used as current ideal waveform signals, current fundamental wave features and current harmonic wave features of the current ideal waveform signals are extracted, and the three-phase current waveform signals of the three-phase current abrupt change region are corrected by using the current fundamental wave features and the current harmonic wave features; filling waveforms of the voltage fundamental wave signals and the voltage harmonic signals corresponding to the three-phase voltage abrupt change areas, extracting voltage fundamental wave characteristics and voltage harmonic characteristics of the voltage ideal waveform signals as voltage ideal waveform signals, and correcting the three-phase voltage waveform signals of the three-phase voltage abrupt change areas by utilizing the voltage fundamental wave characteristics and the voltage harmonic characteristics.
In the above embodiment, since the notch is generated by the commutation device during the commutation, the waveform of the notch is steeply reduced and steeply increased, so that the detected voltage signal is not the power consumption of the actual device, and therefore the fundamental wave and harmonic wave characteristics of the corresponding current/voltage in the abrupt region are filled, and the fundamental wave and harmonic wave characteristics are used as the ideal waveform signal to correct the waveform in the original abrupt region.
In this embodiment, the current fundamental wave characteristic is a current fundamental wave amplitude characteristic, and the current harmonic wave characteristic is a current harmonic wave amplitude characteristic; the voltage fundamental wave characteristic is voltage fundamental wave amplitude characteristic, and the voltage harmonic wave characteristic is voltage harmonic wave amplitude characteristic.
In the above-described embodiment, the three-phase current waveform and the three-phase voltage waveform in the original abrupt region are corrected by the fundamental wave/harmonic amplitude characteristic of the current and the fundamental wave/harmonic amplitude characteristic of the voltage.
In this embodiment, an average value of the three-phase current waveform signal of the three-phase current abrupt change region is obtained and recorded as a first amplitude a 1 Calculating the average value of the current fundamental wave amplitude characteristic and the current harmonic amplitude characteristic, and recording the average value as a second amplitude A 2 Calculating an amplitude correction coefficient Z 1 As shown in formula (1), the amplitude correction coefficient Z 1 =（A 1 +A 2 ）/A 1 The amplitude correction coefficient Z is adopted in (1) 1 Correcting the three-phase current waveform signal of the three-phase current abrupt change region; acquiring an average value of the three-phase voltage waveform signals of the three-phase voltage abrupt change region, and recording the average value as a third amplitude A 3 Calculating the average value of the fundamental current amplitude characteristic and the harmonic current amplitude characteristic, and recording the average value as a fourth amplitude A 4 Calculating an amplitude correction coefficient Z 2 As shown in the formula (2), the amplitude correction coefficient Z 2 =（A 3 +A 4 ）/A 3 The amplitude correction coefficient Z is adopted by (2) 2 And correcting the three-phase voltage waveform signal of the three-phase voltage abrupt change region.
In this embodiment, a corrected three-phase current waveform signal of the three-phase current abrupt change region and a corrected three-phase voltage waveform signal of the three-phase voltage abrupt change region are obtained, and an electric energy metering result of the abrupt change region is calculated; and summing the electric energy metering result of the abrupt change region and the electric energy metering result of the gradual change region to realize electric energy metering.
According to the technical scheme, the electric energy is calculated through the subareas, the waveform of the gradual change region is utilized to correct the waveform of the abrupt change region, the metering accuracy of the electric energy of the power grid under the distortion condition is effectively improved, the electric energy metering is closer to the actual electricity consumption condition, and the real-time performance is better.
Example 2
Referring to fig. 2, the technical solution of the present invention is an electric energy metering box, which includes a controller, where the controller includes a processor 10 and a memory 20, where the memory 20 stores at least one computer program, and the computer program executes an electric energy metering method under waveform distortion of a power grid described in the foregoing embodiment 1 when executed by the processor 10.
In this embodiment, the controller may be a controller independently provided inside the electric energy meter box, or may be a controller provided on an electric energy meter in the electric energy meter box.
Example 3
The technical solution of the present invention is a storage medium storing computer instructions for causing a processor to execute a method for measuring electric energy under waveform distortion of a power grid as described in the above embodiment 1.
It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. An electric energy metering method under waveform distortion of a power grid is characterized by comprising the following steps of:
acquiring a three-phase current waveform signal and a three-phase voltage waveform signal of a power consumer; respectively carrying out continuous discrete acquisition on the three-phase current waveform signal and the three-phase voltage waveform signal according to a preset sampling frequency to obtain a current discrete point set and a voltage discrete point set;
respectively calculating slopes between adjacent discrete points of the current discrete point set and the voltage discrete point set according to time sequences, and respectively dividing the three-phase current waveform signal and the three-phase voltage waveform signal into a mutation area and a gradual change area according to a slope calculation result;
decomposing the three-phase current waveform signal and the three-phase voltage waveform signal of the gradual change region into fundamental wave signals and harmonic signals respectively so as to calculate an electric energy metering result of the gradual change region;
reconstructing the three-phase current waveform signal and the three-phase voltage waveform signal of the abrupt region by taking the fundamental wave signal and the harmonic wave signal which are obtained by decomposition as ideal waveform signals to obtain reconstructed waveforms of the three-phase current waveform signal and the three-phase voltage waveform signal of the abrupt region so as to calculate an electric energy metering result of the abrupt region;
according to the electric energy metering result of the gradual change area and the electric energy metering result of the abrupt change area, electric energy metering is realized;
at a preset sampling frequency f gather Continuously and discretely collecting the three-phase current waveform signals to obtain a current discrete point set P I (1, 2,., N) at a preset sampling frequency gather Continuous processing of the three-phase voltage waveform signalDiscrete acquisition to obtain a voltage discrete point set Q U (1, 2,., N); the current discrete point set P I (1, 2,) N) and the set of voltage discrete points Q U (1, 2,., N) the discrete points are arranged in time sequence;
traversing the set of current discrete points P I (1, 2,., N) slopes between two adjacent points, resulting in a slope set k I (1, 2,..n-1) traversing the set of voltage discrete points Q U (1, 2,., N) slopes between two adjacent points, resulting in a slope set k U (1,2,...,N-1)；
Comparing the slope set k I The method comprises the steps of (1, 2.. N-1) determining a sudden change starting current discrete point and a sudden change ending current discrete point according to preset slope sudden change values, and dividing the three-phase current waveform signals into a three-phase current sudden change region and a three-phase current gradual change region according to the sudden change starting current discrete point and the sudden change ending current discrete point;
comparing the slope set k U The method comprises the steps of (1, 2.. The change amplitude of adjacent slopes in the N-1), determining abrupt starting voltage discrete points and abrupt ending voltage discrete points according to preset slope abrupt change values, and dividing the three-phase voltage waveform signals into a three-phase voltage abrupt change region and a three-phase voltage gradual change region according to the abrupt starting voltage discrete points and the abrupt ending voltage discrete points;
comparing the slope set k I The method comprises the steps of (1, 2,) segmenting the three-phase current waveform signal according to the change amplitude of adjacent slopes in the N-1), and obtaining fundamental wave frequency and harmonic frequency of the three-phase current gradient region by adopting a spectrum estimation method or a synchrophasor measurement method;
comparing the slope set k U (1, 2., N-1) segmenting the three-phase voltage waveform signal according to a preset slope gain value, and obtaining fundamental wave frequency and harmonic frequency of a three-phase voltage gradient region by adopting a spectrum estimation method or a synchrophasor measurement method;
dividing a current filtering frequency band according to fundamental wave frequency and harmonic frequency of the three-phase current waveform, designing a plurality of current frequency band filters covering the current filtering frequency band range, and filtering the three-phase current gradual change region by adopting the current frequency band filters to obtain a current fundamental wave signal and a current harmonic wave signal;
dividing a voltage filtering frequency band according to fundamental wave frequency and harmonic frequency of the three-phase voltage waveform, designing a plurality of voltage frequency band filters covering the voltage filtering frequency band range, and respectively filtering the three-phase voltage gradual change region by adopting the voltage frequency band filters to obtain a voltage fundamental wave signal and a voltage harmonic wave signal;
calculating an electric energy metering result of the gradual change region according to the current fundamental wave signal, the current harmonic wave signal, the voltage fundamental wave signal and the voltage harmonic wave signal;
filling waveforms of the current fundamental wave signals and the current harmonic wave signals corresponding to the three-phase current abrupt change region, extracting current fundamental wave characteristics and current harmonic wave characteristics of the current ideal waveform signals as current ideal waveform signals, and correcting the three-phase current waveform signals of the three-phase current abrupt change region by utilizing the current fundamental wave characteristics and the current harmonic wave characteristics;
filling waveforms of the voltage fundamental wave signals and the voltage harmonic wave signals corresponding to the three-phase voltage abrupt change areas, extracting voltage fundamental wave characteristics and voltage harmonic wave characteristics of the voltage ideal waveform signals as voltage ideal waveform signals, and correcting the three-phase voltage waveform signals of the three-phase voltage abrupt change areas by utilizing the voltage fundamental wave characteristics and the voltage harmonic wave characteristics;
the current fundamental wave characteristic is a current fundamental wave amplitude characteristic, and the current harmonic characteristic is a current harmonic amplitude characteristic;
the voltage fundamental wave characteristic is voltage fundamental wave amplitude characteristic, and the voltage harmonic wave characteristic is voltage harmonic wave amplitude characteristic;
acquiring an average value of three-phase current waveform signals of the three-phase current abrupt change region, and recording the average value as a first amplitude A 1 Calculating the average value of the current fundamental wave amplitude characteristic and the current harmonic amplitude characteristic, and recording the average value as a second amplitude A 2 Calculating an amplitude correction coefficient Z 1 Amplitude correction factor Z 1 =（A 1 +A 2 ）/A 1 By using the amplitude correction coefficient Z 1 Correcting the three-phase current waveform signal of the three-phase current abrupt change region;
acquiring an average value of the three-phase voltage waveform signals of the three-phase voltage abrupt change region, and recording the average value as a third amplitude A 3 Calculating the average value of the fundamental current amplitude characteristic and the harmonic current amplitude characteristic, and recording the average value as a fourth amplitude A 4 Calculating an amplitude correction coefficient Z 2 Amplitude correction factor Z 2 =（A 3 +A 4 ）/A 3 By using the amplitude correction coefficient Z 2 Correcting the three-phase voltage waveform signal of the three-phase voltage abrupt change region;
acquiring a corrected three-phase current waveform signal of the three-phase current abrupt change region and a corrected three-phase voltage waveform signal of the three-phase voltage abrupt change region, and calculating an electric energy metering result of the abrupt change region;
and summing the electric energy metering result of the abrupt change region and the electric energy metering result of the gradual change region to realize electric energy metering.
2. An electrical energy metering box comprising a controller, the controller comprising a processor and a memory, the memory storing at least one computer program which, when executed by the processor, performs an electrical energy metering method under distortion of a power grid waveform as claimed in claim 1.
3. A storage medium having stored thereon computer instructions for causing a processor to perform a method of metering electrical energy under distortion of a power grid waveform as claimed in claim 1.
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