CN107525965B - Power analysis method and device - Google Patents
Power analysis method and device Download PDFInfo
- Publication number
- CN107525965B CN107525965B CN201610471859.XA CN201610471859A CN107525965B CN 107525965 B CN107525965 B CN 107525965B CN 201610471859 A CN201610471859 A CN 201610471859A CN 107525965 B CN107525965 B CN 107525965B
- Authority
- CN
- China
- Prior art keywords
- data
- power parameter
- parameter calculation
- sampling
- path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004458 analytical method Methods 0.000 title claims abstract description 32
- 238000004364 calculation method Methods 0.000 claims abstract description 164
- 238000005070 sampling Methods 0.000 claims abstract description 163
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 56
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 description 10
- 230000009466 transformation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
- G01R21/1331—Measuring real or reactive component, measuring apparent energy
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
Abstract
The application discloses a power analysis method and device, wherein the method comprises the following steps: broadband sampling is carried out on the voltage signal and/or the current signal to obtain voltage sampling data and/or current sampling data; dividing the voltage sampling data and/or the current sampling data into two paths of data for transmission; in the transmission process, conventional power parameter calculation is carried out on the first path of data to obtain a conventional power parameter calculation result, and fundamental wave decomposition is carried out on the second path of data to obtain a fundamental wave component; and calculating the power parameters under the non-sinusoidal unbalanced condition according to the conventional power parameter calculation result and the fundamental component to obtain a non-sinusoidal unbalanced power parameter calculation result so as to realize the purpose of accurately measuring the power parameters under the non-sinusoidal unbalanced condition.
Description
Technical Field
The present invention relates to the field of power measurement technologies, and in particular, to a power analysis method and apparatus.
Background
With the continuous development of electronic equipment, motor speed regulation drives, rectifying devices, electric arc furnaces and other nonlinear loads are widely used in industry and commerce. These loads can cause distortion or imbalance in voltage, current. The traditional metering instrument is designed based on 50/60Hz sine wave, has proved to have larger errors under the waveform distortion condition, and can not correctly reflect the electricity consumption condition of a user.
In the prior art, power is analyzed based on classical power theory, specifically: after the discrete values are obtained by using a pure analog circuit or an analog-to-digital conversion circuit, the effective values and the active power of the voltage and the current are calculated by using a processor, the apparent power and the power factor are calculated according to the effective values, and the reactive power is obtained by the triangular relation of the apparent power, the active power and the reactive power in terms of values. However, classical power theory is based on sinusoidal single frequency signals and balanced systems, and cannot accurately measure power parameters under non-sinusoidal imbalance conditions.
Therefore, how to accurately measure the power parameter under the non-sinusoidal imbalance condition is a problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a power analysis method and a device for realizing the purpose of accurately measuring power parameters under the non-sinusoidal unbalanced condition.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a power analysis method, comprising:
broadband sampling is carried out on the voltage signal and/or the current signal to obtain voltage sampling data and/or current sampling data;
dividing the voltage sampling data and/or the current sampling data into two paths of data for transmission;
in the transmission process, conventional power parameter calculation is carried out on the first path of data to obtain a conventional power parameter calculation result, and fundamental wave decomposition is carried out on the second path of data to obtain a fundamental wave component;
calculating power parameters under a non-sinusoidal unbalanced condition according to the conventional power parameter calculation result and the fundamental component to obtain a non-sinusoidal unbalanced power parameter calculation result;
the calculation of the power parameter under the non-sinusoidal unbalance condition is performed according to the standard IEEE std 1459 for calculating the power parameter under the non-sinusoidal unbalance condition, which is set by the institute of electrical and electronics engineers.
Preferably, the method further comprises:
and displaying the conventional power parameter calculation result and/or the non-sinusoidal unbalanced power parameter calculation result.
Preferably, when the wideband sampling of the voltage signal and/or the current signal is synchronous sampling, correspondingly, the fundamental wave decomposition is performed on the second path of data to obtain a fundamental wave component, which includes:
and carrying out Fourier transform on the second path of data to obtain a fundamental component.
Preferably, when the wideband sampling of the voltage signal and/or the current signal is asynchronous sampling, the performing fundamental decomposition on the second path of data to obtain a fundamental component correspondingly includes:
and carrying out Fourier transform on the second path of data to obtain a fundamental component.
Preferably, when the wideband sampling of the voltage signal and/or the current signal is asynchronous sampling, the performing fundamental decomposition on the second path of data to obtain a fundamental component correspondingly includes:
and carrying out wavelet transformation on the second path of data to obtain a fundamental component.
A power analysis device, comprising: the system comprises a sampling module, a conventional power parameter calculation module, a fundamental wave decomposition module and a non-sinusoidal unbalanced power parameter calculation module;
the output end of the sampling module is respectively connected with the input end of the conventional power parameter calculation module and the input end of the fundamental wave decomposition module, and is used for performing broadband sampling on a voltage signal and/or a current signal, dividing the obtained voltage sampling data and/or current sampling data into two paths of data, wherein the first path of data is sent to the conventional power parameter calculation module, and the second path of data is sent to the fundamental wave decomposition module;
the input end of the conventional power parameter calculation module is connected with the output end of the sampling module, and the output end of the conventional power parameter calculation module is connected with the first input end of the non-sinusoidal unbalanced power parameter calculation module and is used for performing conventional power parameter calculation on the first path of data to obtain a conventional power parameter calculation result and sending the conventional power parameter calculation result to the non-sinusoidal unbalanced power parameter calculation module;
the input end of the fundamental wave decomposition module is connected with the output end of the sampling module, the output end of the fundamental wave decomposition module is connected with the second input end of the non-sinusoidal unbalanced power parameter calculation module, and the fundamental wave decomposition module is used for carrying out fundamental wave decomposition on the second path of data to obtain a fundamental wave component, and sending the fundamental wave component to the non-sinusoidal unbalanced power parameter calculation module;
the first input end of the non-sinusoidal unbalanced power parameter calculation module is connected with the output end of the conventional power parameter calculation module, and the second input end of the non-sinusoidal unbalanced power parameter calculation module is connected with the output end of the fundamental wave decomposition module and is used for calculating power parameters under the non-sinusoidal unbalanced condition according to the fundamental wave component and the conventional power parameter calculation result to obtain a non-sinusoidal unbalanced power parameter calculation result;
the calculation of the power parameter under the non-sinusoidal unbalance condition is performed according to the standard IEEE std 1459 for calculating the power parameter under the non-sinusoidal unbalance condition, which is set by the institute of electrical and electronics engineers.
Preferably, the method further comprises: a display module;
the display module is connected with the output end of the conventional power parameter calculation module and the output end of the non-sinusoidal unbalanced power parameter calculation module and is used for displaying the conventional power parameter calculation result and/or the non-sinusoidal unbalanced power parameter calculation result.
Preferably, the fundamental wave decomposition module is configured to perform fourier transform on the second path data to obtain a fundamental wave component when the sampling module samples a wideband of the voltage signal and/or the current signal in synchronization.
Preferably, the fundamental wave decomposition module is configured to perform fourier transform on the second path of data to obtain a fundamental wave component when the sampling module performs asynchronous sampling on the wideband of the voltage signal and/or the current signal;
preferably, the fundamental wave decomposition module is configured to perform wavelet transform on the second path data to obtain a fundamental wave component when the sampling module performs asynchronous sampling on the wideband of the voltage signal and/or the current signal.
From the above technical solution, the present invention provides a power analysis method and apparatus, where the method includes: broadband signal sampling is carried out on the voltage signal and/or the current signal, and voltage sampling data and/or current sampling data are obtained; dividing the voltage sampling data and/or the current sampling data into two paths of data for transmission; in the transmission process, conventional power parameter calculation is carried out on the first path of data to obtain a conventional power parameter calculation result, and fundamental wave decomposition is carried out on the second path of data to obtain a fundamental wave component; and calculating the power parameters under the non-sinusoidal unbalanced condition according to the conventional power parameter calculation result and the fundamental component to obtain a non-sinusoidal unbalanced power parameter calculation result. It can be seen that the present invention enables accurate measurement of power parameters under non-sinusoidal imbalance conditions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a power analysis method according to a first embodiment of the present invention;
fig. 2 is a flowchart of a power analysis method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power analysis device according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power analysis device according to a fourth embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
The embodiment of the invention discloses a power analysis method and a power analysis device, which aim to accurately measure power parameters under a non-sinusoidal unbalanced condition.
Example 1
An embodiment of the present invention provides a power analysis method, as shown in fig. 1, and a flowchart of the power analysis method disclosed in the embodiment of the present invention, where the method includes:
s101: broadband sampling is carried out on the voltage signal and/or the current signal to obtain voltage sampling data and/or current sampling data;
the wideband sampling of the voltage signal and/or the current signal can realize the sampling of the wideband non-sinusoidal signal with the fundamental wave frequency of 0.1Hz to 5 kHz;
s102, dividing the voltage sampling data and/or the current sampling data into two paths of data for transmission;
when only broadband sampling is carried out on a voltage signal, voltage sampling data are obtained, the voltage sampling data are divided into two paths of data, and the first path of data and the second path of data are both voltage sampling data;
when only current signals are subjected to broadband sampling, current sampling data are obtained, the current sampling data are divided into two paths of data, and the first path of data and the second path of data are both current sampling data;
when broadband sampling is carried out on a voltage signal and a current signal simultaneously, voltage sampling data and current sampling data are obtained, and the voltage sampling data and the current sampling data are divided into two paths of data, wherein the first path of data and the second path of data comprise: voltage sample data and current sample data.
S103: in the transmission process, conventional power parameter calculation is carried out on the first path of data to obtain a conventional power parameter calculation result, and fundamental wave decomposition is carried out on the second path of data to obtain a fundamental wave component;
s104: calculating power parameters under a non-sinusoidal unbalanced condition according to the conventional power parameter calculation result and the fundamental component to obtain a non-sinusoidal unbalanced power parameter calculation result;
the calculation of the power parameter under the non-sinusoidal unbalance condition is performed according to the standard IEEE std 1459 for calculating the power parameter under the non-sinusoidal unbalance condition, which is set by the institute of electrical and electronics engineers.
It should also be noted that the calculation of the conventional power parameters includes, but is not limited to, calculation of voltage effective value, current effective value, active power, apparent power, reactive power and power factor;
likewise, the calculation of the power parameters under the non-sinusoidal unbalanced condition includes, but is not limited to, calculation of fundamental voltage, fundamental current, non-fundamental voltage, non-fundamental current, equivalent apparent power, non-active power, fundamental equivalent apparent power, non-fundamental equivalent apparent power, fundamental sinusoidal apparent power, unbalanced apparent power, positive sequence power factor, unbalanced degree, harmonic apparent power, voltage distortion power, current distortion power, fundamental positive sequence active power, fundamental positive sequence reactive power, fundamental negative sequence active power, fundamental negative sequence reactive power, fundamental zero sequence active power, fundamental zero sequence reactive power, harmonic active power, harmonic distortion power, harmonic pollution degree, and may also include calculation of other at-power parameters.
It should be further described that the power analysis method provided by the embodiment of the invention supports the measurement of power parameters in various wiring modes of single-phase double-wire, single-phase three-wire, three-phase three-wire and three-phase four-wire.
Based on the above-described power analysis method disclosed in the first embodiment of the present invention, for different sampling modes, preferably, when the wideband sampling of the voltage signal and/or the current signal is synchronous sampling, correspondingly, the fundamental wave decomposition is performed on the second path data to obtain a fundamental wave component, including: and carrying out Fourier transform on the second path of data to obtain a fundamental component.
Preferably, when the wideband sampling of the voltage signal and/or the current signal is asynchronous sampling, the performing fundamental decomposition on the second path of data to obtain a fundamental component correspondingly includes: and carrying out Fourier transform on the second path of data to obtain a fundamental component.
Preferably, when the wideband sampling of the voltage signal and/or the current signal is asynchronous sampling, the performing fundamental decomposition on the second path of data to obtain a fundamental component correspondingly includes: and carrying out wavelet transformation on the second path of data to obtain a fundamental component.
The power analysis method disclosed by the embodiment of the invention can be used for obtaining voltage sampling data and/or current sampling data by performing broadband sampling on the voltage signal and/or the current signal; dividing the voltage sampling data and/or the current sampling data into two paths of data for transmission; in the transmission process, conventional power parameter calculation is carried out on the first path of data to obtain a conventional power parameter calculation result, and fundamental wave decomposition is carried out on the second path of data to obtain a fundamental wave component; and calculating the power parameters under the non-sinusoidal unbalanced condition according to the conventional power parameter calculation result and the fundamental component to obtain a non-sinusoidal unbalanced power parameter calculation result. Therefore, the embodiment of the invention can accurately measure the power parameters under the non-sinusoidal unbalanced condition, and the measurement result can truly reflect the condition of the power system. In addition, since the voltage signal and/or the current signal are sampled in a wide frequency band in the embodiment of the invention, and the calculation of the power parameter under the non-sinusoidal unbalanced condition is performed according to the IEEE std 1459 standard, it can be seen that the embodiment of the invention supports not only the calculation of the power parameter of the power frequency signal with the fundamental wave frequency of 50Hz and 60Hz, but also the calculation of the power parameter of the non-sinusoidal signal with the fundamental wave frequency of 0.1Hz to 5 kHz.
Furthermore, the embodiment of the invention can realize fundamental wave decomposition in a mode of combining synchronous sampling and Fourier transformation, can also realize fundamental wave decomposition in a mode of combining asynchronous sampling and Fourier transformation or in a mode of combining asynchronous sampling and wavelet transformation, and further ensures that the measurement of the power parameters under the non-sinusoidal unbalanced condition can be realized by utilizing the fundamental wave component and the conventional power parameter calculation result.
Example two
Based on the above-mentioned power analysis method according to the first embodiment of the present invention, as shown in fig. 2, the power analysis method according to the second embodiment of the present invention further includes, based on S101 to S104 shown in fig. 1:
s105: and displaying the conventional power parameter calculation result and/or the non-sinusoidal unbalanced power parameter calculation result.
The conventional power parameter calculation result may be displayed separately, the non-sinusoidal unbalanced power parameter calculation result may be displayed separately, and the conventional power parameter calculation result and the non-sinusoidal unbalanced power parameter calculation result may be displayed in a contrasting manner.
The power analysis method disclosed by the embodiment of the invention can be used for obtaining voltage sampling data and/or current sampling data by performing broadband sampling on the voltage signal and/or the current signal; dividing voltage sampling data and/or current sampling data into two paths of data for transmission; in the transmission process, conventional power parameter calculation is carried out on the first path of data to obtain a conventional power parameter calculation result, and fundamental wave decomposition is carried out on the second path of data to obtain a fundamental wave component; and calculating the power parameters under the non-sinusoidal unbalanced condition according to the conventional power parameter calculation result and the fundamental component to obtain a non-sinusoidal unbalanced power parameter calculation result. Therefore, the embodiment of the invention can accurately measure the power parameters under the non-sinusoidal unbalanced condition, and the measurement result truly reflects the condition of the power system. In addition, since the voltage signal and/or the current signal are sampled in a broadband manner in the embodiment of the invention, and the calculation of the power parameter under the non-sinusoidal unbalanced condition is performed according to the IEEE std 1459 standard, it can be seen that the embodiment of the invention not only supports the calculation of the power parameter of the power frequency signal with the fundamental wave frequency of 50Hz and 60Hz, but also supports the calculation of the power parameter of the non-sinusoidal signal with the fundamental wave frequency of 0.1Hz to 5 kHz.
Further, by displaying the conventional power parameter calculation result and/or the non-sinusoidal unbalanced power parameter calculation result, it is possible to separately display the conventional power parameter calculation result or the non-sinusoidal unbalanced power parameter calculation result, and at the same time, it is also possible to display the conventional power parameter calculation result and the non-sinusoidal unbalanced power parameter calculation result in a contrasting manner.
Example III
An embodiment of the present invention provides a power analysis device, as shown in fig. 3, which is provided in the embodiment of the present invention, and includes:
a sampling module 101, a conventional power parameter calculation module 102, a fundamental decomposition module 103, and a non-sinusoidal unbalanced power parameter calculation module 104;
the output end of the sampling module 101 is respectively connected with the input end of the conventional power parameter calculation module 102 and the input end of the fundamental wave decomposition module 103, and is used for performing wideband signal sampling on a voltage signal and/or a current signal, and dividing the obtained voltage sampling data and/or current sampling data into two paths of data, wherein the first path of data is sent to the conventional power parameter calculation module 102, and the second path of data is sent to the fundamental wave decomposition module 103;
the wideband sampling of the voltage signal and/or the current signal can realize the sampling of the wideband non-sinusoidal signal with the fundamental wave frequency of 0.1Hz to 5 kHz;
when the sampling module only performs broadband sampling on the voltage signal, voltage sampling data are obtained, and the voltage sampling data are divided into two paths of data, wherein the first path of data and the second path of data are both voltage sampling data;
when the sampling module only performs broadband sampling on the current signal, current sampling data are obtained, and the current sampling data are divided into two paths of data, wherein the first path of data and the second path of data are both current sampling data;
when the sampling module performs broadband sampling on the voltage signal and the current signal simultaneously, voltage sampling data and current sampling data are obtained, and the voltage sampling data and the current sampling data are divided into two paths of data, wherein the first path of data and the second path of data comprise: voltage sample data and current sample data.
The input end of the conventional power parameter calculation module 102 is connected with the output end of the sampling module 101, and the output end is connected with the first input end of the non-sinusoidal unbalanced power parameter calculation module 104, and is used for performing conventional power parameter calculation on the first path of data to obtain a conventional power parameter calculation result, and sending the conventional power parameter calculation result to the non-sinusoidal unbalanced power parameter calculation module 104;
the input end of the fundamental wave decomposition module 103 is connected with the output end of the sampling module 101, and the output end is connected with the second input end of the non-sinusoidal unbalanced power parameter calculation module 104, and is used for performing fundamental wave decomposition on the second path of data to obtain a fundamental wave component, and transmitting the fundamental wave component to the non-sinusoidal unbalanced power parameter calculation module 104;
the first input end of the non-sinusoidal unbalanced power parameter calculation module 104 is connected with the output end of the conventional power parameter calculation module 102, and the second input end is connected with the output end of the fundamental wave decomposition module 103, so as to calculate the power parameter under the non-sinusoidal unbalanced condition according to the fundamental wave component and the conventional power parameter calculation result, and obtain a non-sinusoidal unbalanced power parameter calculation result;
the calculation of the power parameter under the non-sinusoidal unbalance condition is performed according to the standard IEEE std 1459 for calculating the power parameter under the non-sinusoidal unbalance condition, which is set by the institute of electrical and electronics engineers.
It should be noted that, the calculation of the conventional power parameters includes, but is not limited to, calculation of voltage effective value, current effective value, active power, apparent power, reactive power and power factor;
likewise, the calculation of the power parameters under the non-sinusoidal unbalanced condition includes, but is not limited to, calculation of fundamental voltage, fundamental current, non-fundamental voltage, non-fundamental current, equivalent apparent power, non-active power, fundamental equivalent apparent power, non-fundamental equivalent apparent power, fundamental sinusoidal apparent power, unbalanced apparent power, positive sequence power factor, unbalanced degree, harmonic apparent power, voltage distortion power, current distortion power, fundamental positive sequence active power, fundamental positive sequence reactive power, fundamental negative sequence active power, fundamental negative sequence reactive power, fundamental zero sequence active power, fundamental zero sequence reactive power, harmonic active power, harmonic distortion power, harmonic pollution degree, and may also include calculation of other at-power parameters.
It should be further described that the power analysis method provided by the embodiment of the invention supports the measurement of power parameters in various wiring modes of single-phase double-wire, single-phase three-wire, three-phase three-wire and three-phase four-wire.
Based on the above-mentioned power analysis device disclosed in the third embodiment of the present invention, it is preferable that, according to different sampling modes, the fundamental wave decomposition module 103 is configured to perform fourier transform on the second path data to obtain a fundamental wave component when the sampling module 101 performs synchronous sampling on the wideband samples of the voltage signal and/or the current signal.
Preferably, the fundamental decomposition module 103 is configured to perform fourier transform on the second path data to obtain a fundamental component when the sampling module 101 performs asynchronous sampling on the wideband voltage signal and/or the wideband current signal;
preferably, the fundamental decomposition module 103 is configured to perform wavelet transform on the second path data to obtain a fundamental component when the sampling module 101 performs asynchronous sampling on the wideband voltage signal and/or the wideband current signal.
The embodiment of the invention discloses a power analysis device, which comprises: the output end of the sampling module is respectively connected with the input end of the conventional power parameter calculation module and the input end of the fundamental wave decomposition module, and is used for carrying out broadband sampling on the voltage signal and/or the current signal, and dividing the obtained voltage sampling data and/or the current sampling data into two paths of data, wherein the first path of data is sent to the conventional power parameter calculation module, and the second path of data is sent to the fundamental wave decomposition module; the input end of the conventional power parameter calculation module is connected with the output end of the sampling module, the output end of the conventional power parameter calculation module is connected with the first input end of the non-sinusoidal unbalanced power parameter calculation module, and the output end of the conventional power parameter calculation module is used for performing conventional power parameter calculation on the first path of data to obtain a conventional power parameter calculation result and transmitting the conventional power parameter calculation result to the non-sinusoidal unbalanced power parameter calculation module; the input end of the fundamental wave decomposition module is connected with the output end of the sampling module, the output end of the fundamental wave decomposition module is connected with the second input end of the non-sinusoidal unbalanced power parameter calculation module, and the fundamental wave decomposition module is used for carrying out fundamental wave decomposition on the second path of data to obtain a fundamental wave component and transmitting the fundamental wave component to the non-sinusoidal unbalanced power parameter calculation module; the first input end of the non-sinusoidal unbalanced power parameter calculation module is connected with the output end of the conventional power parameter calculation module, and the second input end of the non-sinusoidal unbalanced power parameter calculation module is connected with the output end of the fundamental wave decomposition module and is used for calculating the power parameters under the non-sinusoidal unbalanced condition according to the fundamental wave component and the conventional power parameter calculation result to obtain a non-sinusoidal unbalanced power parameter calculation result. Therefore, the embodiment of the invention can accurately measure the power parameters under the non-sinusoidal unbalanced condition, and the measurement result can truly reflect the condition of the power system. In addition, since the voltage signal and/or the current signal are sampled in a broadband manner in the embodiment of the invention, and the calculation of the power parameter under the non-sinusoidal unbalanced condition is performed according to the IEEE std 1459 standard, it can be seen that the embodiment of the invention not only supports the calculation of the power parameter of the power frequency signal with the fundamental wave frequency of 50Hz and 60Hz, but also supports the calculation of the power parameter of the non-sinusoidal signal with the fundamental wave frequency of 0.1Hz to 5 kHz.
Furthermore, the embodiment of the invention can realize fundamental wave decomposition in a mode of combining synchronous sampling and Fourier transformation, can also realize fundamental wave decomposition in a mode of combining asynchronous sampling and Fourier transformation or in a mode of combining asynchronous sampling and wavelet transformation, and further ensures that the measurement of the power parameters under the non-sinusoidal unbalanced condition can be realized by utilizing the fundamental wave component and the conventional power parameter calculation result.
Example IV
Based on the above-mentioned power analysis device according to the third embodiment of the present invention, as shown in fig. 4, the power analysis device according to the fourth embodiment of the present invention further includes, on the basis of the power analysis device shown in fig. 3: a display module 105;
the display module 105 is connected to the output end of the conventional power parameter calculation module 102 and the output end of the non-sinusoidal unbalanced power parameter calculation module 104, and is configured to display the conventional power parameter calculation result and/or the non-sinusoidal unbalanced power parameter calculation result.
Preferably, the display module includes: a liquid crystal display.
Preferably, the display module includes: a multi-screen display.
The conventional power parameter calculation result may be displayed separately, the non-sinusoidal unbalanced power parameter calculation result may be displayed separately, and the conventional power parameter calculation result and the non-sinusoidal unbalanced power parameter calculation result may be displayed in a contrasting manner.
The power analysis device disclosed by the embodiment of the invention can accurately measure the power parameters under the non-sinusoidal unbalanced condition, and the measurement result truly reflects the condition of the power system.
Further, the method further comprises the following steps: a display module; the display module is connected with the output end of the conventional power parameter calculation module and the output end of the non-sinusoidal unbalanced power parameter calculation module and is used for displaying the conventional power parameter calculation result and/or the non-sinusoidal unbalanced power parameter calculation result; therefore, the display of the conventional power parameter calculation result or the non-sinusoidal unbalanced power parameter calculation result is realized, and the comparison display of the conventional power parameter calculation result or the non-sinusoidal unbalanced power parameter calculation result can also be realized.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
It is further noted that 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, or is intended to include, elements inherent to such process, method, article, or apparatus.
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 (2)
1. A method of power analysis, comprising:
broadband sampling is carried out on the voltage signal and/or the current signal to obtain voltage sampling data and/or current sampling data;
dividing the voltage sampling data and/or the current sampling data into two paths of data for transmission; when only broadband sampling is carried out on a voltage signal, voltage sampling data are obtained, the voltage sampling data are divided into two paths of data, and the first path of data and the second path of data are both voltage sampling data; when only current signals are subjected to broadband sampling, current sampling data are obtained, the current sampling data are divided into two paths of data, and the first path of data and the second path of data are both current sampling data; when broadband sampling is carried out on a voltage signal and a current signal simultaneously, voltage sampling data and current sampling data are obtained, and the voltage sampling data and the current sampling data are divided into two paths of data, wherein the first path of data and the second path of data comprise: voltage sampling data and current sampling data;
in the transmission process, conventional power parameter calculation is carried out on the first path of data to obtain a conventional power parameter calculation result, and fundamental wave decomposition is carried out on the second path of data to obtain a fundamental wave component; when the wideband sampling of the voltage signal and/or the current signal is synchronous sampling, correspondingly, the fundamental wave decomposition of the second path of data is carried out to obtain a fundamental wave component, which comprises the following steps: performing Fourier transform on the second path of data to obtain a fundamental component; when the wideband sampling of the voltage signal and/or the current signal is asynchronous sampling, correspondingly, the fundamental wave decomposition of the second path of data is carried out to obtain a fundamental wave component, which comprises the following steps: performing Fourier transform on the second path of data to obtain a fundamental component, or performing wavelet transform on the second path of data to obtain the fundamental component;
calculating power parameters under a non-sinusoidal unbalanced condition according to the conventional power parameter calculation result and the fundamental component to obtain a non-sinusoidal unbalanced power parameter calculation result;
displaying the conventional power parameter calculation result and/or the non-sinusoidal unbalanced power parameter calculation result; the calculation of the power parameter under the non-sinusoidal unbalance condition is performed according to the standard IEEE std 1459 for calculating the power parameter under the non-sinusoidal unbalance condition, which is set by the institute of electrical and electronics engineers.
2. A power analysis device, comprising: the device comprises a sampling module, a conventional power parameter calculation module, a fundamental wave decomposition module, a non-sinusoidal unbalanced power parameter calculation module and a display module;
the output end of the sampling module is respectively connected with the input end of the conventional power parameter calculation module and the input end of the fundamental wave decomposition module, and is used for performing broadband sampling on a voltage signal and/or a current signal, dividing the obtained voltage sampling data and/or current sampling data into two paths of data, wherein the first path of data is sent to the conventional power parameter calculation module, and the second path of data is sent to the fundamental wave decomposition module; when only broadband sampling is carried out on a voltage signal, voltage sampling data are obtained, the voltage sampling data are divided into two paths of data, and the first path of data and the second path of data are both voltage sampling data; when only current signals are subjected to broadband sampling, current sampling data are obtained, the current sampling data are divided into two paths of data, and the first path of data and the second path of data are both current sampling data; when broadband sampling is carried out on a voltage signal and a current signal simultaneously, voltage sampling data and current sampling data are obtained, and the voltage sampling data and the current sampling data are divided into two paths of data, wherein the first path of data and the second path of data comprise: voltage sampling data and current sampling data;
the input end of the conventional power parameter calculation module is connected with the output end of the sampling module, and the output end of the conventional power parameter calculation module is connected with the first input end of the non-sinusoidal unbalanced power parameter calculation module and is used for performing conventional power parameter calculation on the first path of data to obtain a conventional power parameter calculation result and sending the conventional power parameter calculation result to the non-sinusoidal unbalanced power parameter calculation module;
the input end of the fundamental wave decomposition module is connected with the output end of the sampling module, the output end of the fundamental wave decomposition module is connected with the second input end of the non-sinusoidal unbalanced power parameter calculation module, and the fundamental wave decomposition module is used for carrying out fundamental wave decomposition on the second path of data to obtain a fundamental wave component, and sending the fundamental wave component to the non-sinusoidal unbalanced power parameter calculation module; the fundamental wave decomposition module is used for carrying out Fourier transform on the second path of data to obtain a fundamental wave component when the sampling module synchronously samples the broadband of the voltage signal and/or the current signal; the fundamental wave decomposition module is used for carrying out Fourier transform on the second path of data to obtain a fundamental wave component or carrying out wavelet transform on the second path of data to obtain the fundamental wave component when the sampling module is used for sampling the broadband of the voltage signal and/or the current signal in an asynchronous mode;
the first input end of the non-sinusoidal unbalanced power parameter calculation module is connected with the output end of the conventional power parameter calculation module, and the second input end of the non-sinusoidal unbalanced power parameter calculation module is connected with the output end of the fundamental wave decomposition module and is used for calculating power parameters under the non-sinusoidal unbalanced condition according to the fundamental wave component and the conventional power parameter calculation result to obtain a non-sinusoidal unbalanced power parameter calculation result;
the display module is connected with the output end of the conventional power parameter calculation module and the output end of the non-sinusoidal unbalanced power parameter calculation module and is used for displaying the conventional power parameter calculation result and/or the non-sinusoidal unbalanced power parameter calculation result;
the calculation of the power parameter under the non-sinusoidal unbalance condition is performed according to the standard IEEE std 1459 for calculating the power parameter under the non-sinusoidal unbalance condition, which is set by the institute of electrical and electronics engineers.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610471859.XA CN107525965B (en) | 2016-06-22 | 2016-06-22 | Power analysis method and device |
| EP17814447.3A EP3477313A4 (en) | 2016-06-22 | 2017-03-13 | Power analysis method and device |
| PCT/CN2017/076395 WO2017219708A1 (en) | 2016-06-22 | 2017-03-13 | Power analysis method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610471859.XA CN107525965B (en) | 2016-06-22 | 2016-06-22 | Power analysis method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107525965A CN107525965A (en) | 2017-12-29 |
| CN107525965B true CN107525965B (en) | 2024-03-26 |
Family
ID=60735535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610471859.XA Active CN107525965B (en) | 2016-06-22 | 2016-06-22 | Power analysis method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107525965B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633259B (en) * | 2019-01-21 | 2022-06-07 | 蓝海智能科技有限公司 | Brushless motor power detection method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08136595A (en) * | 1994-11-08 | 1996-05-31 | Nissin Electric Co Ltd | Harmonics measuring apparatus |
| CN101055299A (en) * | 2007-01-31 | 2007-10-17 | 湖南大学 | Impact load electric energy metering method |
| CN101762743A (en) * | 2009-12-31 | 2010-06-30 | 上海宝钢安大电能质量有限公司 | Three phase electrical measurement method based on positive-sequence component computation |
| CN102062803A (en) * | 2009-11-17 | 2011-05-18 | 湖北省电力试验研究院 | Active current extraction method based on orthogonal sine wave integral modulation |
| CN102495389A (en) * | 2011-12-23 | 2012-06-13 | 安徽节源节能科技有限公司 | Electrical measurement instrument model calibrating method and system |
| CN205786837U (en) * | 2016-06-22 | 2016-12-07 | 广州致远电子股份有限公司 | A kind of power analysis device |
-
2016
- 2016-06-22 CN CN201610471859.XA patent/CN107525965B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08136595A (en) * | 1994-11-08 | 1996-05-31 | Nissin Electric Co Ltd | Harmonics measuring apparatus |
| CN101055299A (en) * | 2007-01-31 | 2007-10-17 | 湖南大学 | Impact load electric energy metering method |
| CN102062803A (en) * | 2009-11-17 | 2011-05-18 | 湖北省电力试验研究院 | Active current extraction method based on orthogonal sine wave integral modulation |
| CN101762743A (en) * | 2009-12-31 | 2010-06-30 | 上海宝钢安大电能质量有限公司 | Three phase electrical measurement method based on positive-sequence component computation |
| CN102495389A (en) * | 2011-12-23 | 2012-06-13 | 安徽节源节能科技有限公司 | Electrical measurement instrument model calibrating method and system |
| CN205786837U (en) * | 2016-06-22 | 2016-12-07 | 广州致远电子股份有限公司 | A kind of power analysis device |
Non-Patent Citations (1)
| Title |
|---|
| 杨雪凇.EEE Std 1459-2010功率理论及其应用研究.《中国优秀硕士学位论文全文数据库 信息科技辑(月刊)》.2016,(第期),参见第1-18页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107525965A (en) | 2017-12-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Cataliotti et al. | A phase-locked loop for the synchronization of power quality instruments in the presence of stationary and transient disturbances | |
| CN101807795B (en) | Method for forming electric energy metering simulation system and device thereof | |
| CN106226723B (en) | Electric energy metering simulation analysis system and method for complex nonlinear load environment | |
| CN203287435U (en) | A micro electrical network harmonic wave and inter-harmonic wave test apparatus based on an STM32F107VCT6 | |
| CN105723229A (en) | Synchronous phasor measurement method applicable to P-type phasor measurement unit (PMU) | |
| CN106772208B (en) | Single three-phase meter integrated reliability test board | |
| CN108318852A (en) | A kind of intelligent electric energy meter square wave influence test method | |
| Adamo et al. | A proposal for an open source energy meter | |
| CN104931775A (en) | Network multi-functional three-phase electric energy meter possessing electric energy quality analysis function | |
| Yang et al. | A novel algorithm for accurate frequency measurement using transformed consecutive points of DFT | |
| CN102495250A (en) | Quasi-synchronous wideband reactive energy meter based on Hilbert algorithm and sampling method thereof | |
| CN102841330A (en) | Calibrating method used for calibrating analytical instrument | |
| CN107525965B (en) | Power analysis method and device | |
| JP2006234402A (en) | Power source line measuring instrument | |
| Esim et al. | Research and development of a virtual instrument for measurement analysis and monitoring of the Power Quality | |
| CN205786837U (en) | A kind of power analysis device | |
| WO2017219708A1 (en) | Power analysis method and device | |
| Bucci et al. | Development of a low cost power meter based on a digital signal controller | |
| Cataliotti et al. | A time-domain strategy for the measurement of IEEE Standard 1459-2000 power quantities in nonsinusoidal three-phase and single-phase systems | |
| Kušljević et al. | Active power measurement algorithm for power system signals under non-sinusoidal conditions and wide-range frequency deviations | |
| CN216144942U (en) | Wireless electric sensor, electric parameter measurement and calculation device and system | |
| CN115078803A (en) | Distributed radio parameter sampling system and method | |
| CN104345218A (en) | Reactance value measurement system and method for three-phase reactor | |
| CN103176030A (en) | Method for detecting inter-harmonics of power distribution system | |
| CN115436869A (en) | Wireless electric sensor, electric parameter measurement calculation device, method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |