TW201342765A - Signal reconstruction system and signal reconstruction method thereof - Google Patents

Abstract

The present invention discloses a signal reconstruction system and a signal reconstruction method thereof. The signal reconstruction system comprises a capturing module, a processing module, a reconstruction module, a spectrum analysis module and a storage module. The capturing module captures several power signals. The processing module analyzes power signals to get a fundamental frequency, calculates the frequency of the fundamental frequency and power signals, and calculates a re-sampling frequency based on the fundamental frequency and a fixed sampling frequency. The reconstruction module calculates a reconstruction power signal based on the re-sampling frequency. The spectrum analysis module analyzes the fundamental frequency and the reconstruction power signal to get a waveform of power signals. The storage module stores the waveform of power signals. Determining the error value of the fundamental frequency and calculating the re-sampling frequency based on the fixed sampling frequency by the processing module to decrease the operation burden of the system.

Description

Signal reconstruction system and its signal reconstruction method

The invention relates to a signal reconstruction system and a signal reconstruction method thereof, in particular to a signal reconstruction system capable of calculating a fundamental frequency according to a fixed sampling frequency, obtaining a resampling frequency, reducing a system computing load, and reconstructing a power signal. And its signal reconstruction method.

In recent years, with the increase of energy costs, countries in addition to seeking viable alternative energy sources to actively break through the energy consumption of electrical equipment, the concept of smart grid has become the trend of modernization of traditional power systems. Among them, the power quality is an important issue that the power supply industry and the electricity consumers pay attention to. The power quality interference signal will cause power loss to the electrical equipment connected to the power system, thus causing the equipment to operate incorrectly and the service life is reduced. Recently, the concept of smart grids has been through integrated communications, advanced components, advanced control methods, sensing and measurement, improved interfaces, and decision support ( New requirements such as decision support are being proposed. As progressive metering infrastructure technology is fundamental to the rapid modernization of smart grids, accurate and efficient monitoring of power quality and system status is key.

In addition, wide-area measurement is an extension of the concept of remote monitoring through many integrated communication technologies. Whether it is to analyze harmonics/interharmonics, voltage/flicker disturbances or power quality in monitoring power signals, it is necessary to first pass the steps of power signal synchronization. In order to facilitate subsequent analysis of the work. Traditional remote power quality monitoring methods rely on many terminal instruments that require high processing power. The operation of the communication network is limited to the transmission of pre-stored processing. In this method, remote instruments often require a high price to achieve a powerful Functions such as synchronization, data acquisition, power quality interference analysis, storage of data, and information transfer, etc., but in order to achieve these functions, will cause difficulties in the deployment of remote measurement systems. As shown in FIG. 1 , the signal synchronization system 1 captures a plurality of power signals 111 by an analog-to-digital converter (ADC) 11 , and the power is synchronized by the processing module 12 . The signal 111 is obtained to obtain the fundamental frequency 121, and the base frequency 121 and the sample number 122 are calculated by the analog-to-digital converter 11 and the processing module 12 multiple times to obtain an accurate sampling frequency 123, and are performed by the analysis module 13 Subsequent analysis of harmonics/interharmonics and power quality.

However, in the process of calculating the sampling multiple times to improve the accuracy of the sampling frequency, the operational burden of the system is caused. Therefore, there is a need to provide a signal reconstruction system and a signal reconstruction method thereof that can provide accurate and efficient reconstruction of power signals and reduce the computational burden of the system.

In view of the above-mentioned problems of the prior art, the object of the present invention is to provide a signal reconstruction system and a signal reconstruction method thereof to solve the problem of obtaining accurate power signals by calculating the fundamental frequency and the number of samples in the prior art. The system is overburdened.

According to the purpose of the present invention, a signal reconstruction system is provided, which comprises a capture module, a processing module, a reconstruction module, a spectrum analysis module and a storage module. The capture module can capture a plurality of power signals; the processing module, the electrical connection capture module, can analyze the power signal to obtain a fundamental frequency, and calculate the frequency of the fundamental frequency and the power signal to obtain an error If the error value is less than a preset value, the processing module can calculate a resampling frequency according to the fundamental frequency and the fixed sampling frequency; the reconstruction module is electrically connected to the processing module, and the reconstructed power signal can be calculated according to the resampling frequency. Spectrum analysis module, electrical connection processing module and reconstruction module, which can analyze the fundamental frequency and reconstruct the power signal to obtain the waveform of the power signal; and the storage module, which is electrically connected to the spectrum analysis module and can store the power signal Waveform.

The capture module converts the power signal from the analog signal to the digital signal.

Wherein, if the error value is greater than the preset value, the spectrum analysis module may analyze the fundamental frequency to obtain an error analysis data.

The storage module can store error analysis data.

Wherein, if the error value is less than the preset value, the spectrum analysis module can analyze the fundamental frequency to obtain an analysis data.

The storage module can store the analysis data.

The reconstruction module calculates a reciprocal of the fundamental frequency to obtain a first time interval, and calculates a reciprocal of the resampling frequency to obtain a second time interval, and uses the interpolation method to calculate the first time interval and the second time. Interval to obtain a reconstructed power signal.

According to another aspect of the present invention, a signal reconstruction method is provided for a signal reconstruction system, wherein the signal reconstruction system includes a capture module, a processing module, a reconstruction module, a spectrum analysis module, and an analysis module. The signal reconstruction method comprises the steps of: capturing a plurality of power signals by the capture module; analyzing the power signal by the processing module to obtain a fundamental frequency, and calculating the frequency of the fundamental frequency and the power signal to obtain an error value; Providing a processing module for calculating a resampling frequency based on the fundamental frequency and the fixed sampling frequency; providing a reconstruction module to calculate a reconstructed power signal based on the resampling frequency; analyzing the fundamental frequency and reconstructing the power signal by the spectrum analysis module to obtain the power signal The waveform; and the waveform of the power signal stored by the storage module.

The method further includes converting the power signal from the analog signal to the digital signal by using the capture module.

Wherein, the method further comprises: if the error value is greater than the preset value, analyzing the fundamental frequency by the spectrum analysis module to obtain an error analysis data.

The method further includes storing the error analysis data by using the storage module.

Wherein, the method further comprises: if the error value is less than the preset value, analyzing the fundamental frequency by the spectrum analysis module to obtain an analysis data.

The method further includes storing the analysis data by using the storage module.

The method further includes: obtaining, by the reconstruction module, a reciprocal of the fundamental frequency as the first time interval, and obtaining a reciprocal of the resampling frequency as the second time interval.

The method further includes providing the reconstruction module to calculate the first time interval and the second time interval by using interpolation to obtain a reconstructed power signal.

As described above, the signal reconstruction system and the signal reconstruction method thereof of the present invention extract a plurality of power signals by using a capture module, and use the processing module to calculate a resampling frequency according to a fundamental frequency and a fixed sampling frequency, and determine a re The error value of the sampling frequency is calculated by the reconstruction module to reconstruct the power signal and perform subsequent power quality analysis. The capture module only needs to perform data acquisition and transmission of the power signal sample. Without multiple sampling calculations, the processing module and the reconstruction module can be used to reconstruct the power signal, thereby reducing the computational burden of the system.

For a better understanding and understanding of the technical features and the efficacies of the present invention, the preferred embodiments and the detailed description are as follows.

The present invention will be described in conjunction with the accompanying drawings in the accompanying drawings, and the drawings The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. First described.

The embodiments of the signal reconstruction system and the signal reconstruction method thereof according to the present invention will be described below with reference to the related drawings. For the sake of understanding, the same components in the following embodiments are denoted by the same reference numerals.

Please refer to FIG. 2, which is a block diagram of the signal reconstruction system of the present invention. In the figure, the signal reconstruction system 2 includes a capture module 21, a processing module 22, a reconstruction module 23, a spectrum analysis module 24, and a storage module 25. The capture module 21 captures a plurality of power signals 211, which may include an Analog-to-Digital Converter (ADC) to convert a plurality of analog signals into digital signals. The processing module 22 is electrically connected to the capture module 21, and can analyze the power signal 211 to obtain the fundamental frequency 222 of the power signal 211, and determine the frequency of the base frequency 222 and the power signal 211 to obtain an error value 223. If the error value 223 is less than a predetermined value 224, the processing module 22 may calculate the resampling frequency 225 based on the fundamental frequency 222 and the fixed sampling frequency 221. The reconstruction module 23 is electrically connected to the processing module 22, and the reconstructed power signal 231 is calculated according to the resampling frequency 225. The spectrum analysis module 24 is electrically connected to the processing module 22 and the reconstruction module 23, and analyzes the fundamental frequency 222 and the reconstructed power signal 231 to obtain the power signal waveform 241. The storage module 25 is electrically connected to the spectrum analysis module 24 and stores the power signal waveform 241.

Further, the capture module 21 converts the captured power signal 211 from the analog signal to a digital signal and transmits the signal to the processing module 22. The processing module 22 has a set fixed sampling frequency 221, and the base frequency 222 of the plurality of power signals 211 can be calculated according to the fixed sampling frequency 221. The processing module 22 calculates the error value 223 of the fundamental frequency 222 and the captured power signal 211, and determines whether the error value 223 is less than a set preset value 224. In this embodiment, the preset value 224 can be set to 0.03% according to the International Electrotechnical Commission standard (IEC-61000-4-7), and if the error value 223 of the fundamental frequency 222 is less than 0.03% of the preset value 224, then It is indicated that the accuracy of the fundamental frequency 222 is within the error range. If the error value 223 of the baseband 222 is less than 0.03% of the preset value 224, the fixed sampling frequency 221 and the base frequency 222 can be calculated by the processing module 22 to obtain the resampling frequency 225. After receiving the resampling frequency 225, the reconstruction module 23 can calculate the reciprocal of the fundamental frequency 222 to obtain the first time interval 232; and obtain the second time interval 233 according to the reciprocal of the resampling frequency 225, and calculate by the interpolation method The reconstructed power signal 231 is obtained for a time interval 232 and a second time interval 233. The spectrum analysis module 24 can analyze the reconstructed power signal 231 to obtain the power signal waveform 241 and store the power signal waveform 241 to the storage module 25.

More specifically, if the error value 223 of the baseband 222 is less than the preset value 224 of 0.03%, indicating that the error value 223 is within the preset value 224, the baseband 222 can be directly transmitted to the spectrum analysis module 24 for spectrum analysis. To obtain an analytical data227. If the error value 223 of the baseband 222 is greater than the preset value 224, the spectrum analysis may be performed to obtain an error analysis data 226, and the analysis data 227 and the error analysis data 226 are stored by the storage module 25.

Please refer to FIG. 3, which is a first flowchart of the signal reconstruction method of the present invention and a second flowchart of the signal reconstruction method of the present invention. In the figure, the signal reconstruction method of the present invention includes the step S11 of extracting a plurality of power signals by the capture module. The capture module can be an Analog-to-Digital Converter (ADC), but is not limited thereto. Step S12 is to convert the power signal from the analog signal into a digital signal by using the capture module. Next, step S13 is to analyze the power signal by the processing module to obtain a fundamental frequency. Step S14 is to calculate the frequency of the fundamental frequency and the power signal by the processing module to obtain an error value. In step S15, it is determined by the processing module whether the error value is less than a preset value. If the error value is less than the preset value, step A is performed, and step A is synchronized to step S151, which is to provide the processing module to calculate the resampling frequency according to the fundamental frequency and the fixed sampling frequency; and step S152 is to analyze by the spectrum analysis module. The fundamental frequency to obtain analytical data. After step S151, step S16 calculates a reconstructed power signal according to the resampling frequency for providing the reconstruction module. The reconstruction module obtains the first time interval according to the reciprocal of the fundamental frequency, and obtains the second time interval by reciprocal of the resampling frequency, and calculates the first time interval and the second time interval by using the interpolation method to obtain the reconstructed power signal. . Next, step S17 is to analyze the fundamental frequency and reconstruct the power signal by the spectrum analysis module to obtain the power signal waveform. If the error value of the fundamental frequency is greater than the preset value, step S153 is performed to analyze the fundamental frequency by the spectrum analysis module to obtain error analysis data. Finally, after steps S17, S152 and S153, step S18 is to store the power signal waveform, the analysis data and the error analysis data by the storage module.

In summary, the signal reconstruction system and the signal reconstruction method of the present invention acquire a plurality of power signals by the capture module, and convert the power signal from the analog signal into a digital signal for subsequent calculation and analysis. The processing module analyzes the power signal to obtain the fundamental frequency, calculates the error value of the fundamental frequency and the power signal, calculates the resampling frequency by using the fixed sampling frequency, and then calculates the resampling frequency through the reconstruction module to obtain the reconstructed power signal. The spectrum analysis module can analyze and reconstruct the power signal to obtain the waveform of the power signal and know the components in the power signal. If the error value is greater than the preset value, the spectrum analysis module can analyze the fundamental frequency to obtain error analysis data; and if the error value is smaller than the preset base frequency, the spectrum analysis can be directly performed to obtain the analysis data. Finally, the power module waveform, error analysis data, and analysis data can be stored by the storage module. In this way, the capture module only performs signal acquisition and converts the signal from the analog to the digital signal, and does not need to calculate the fundamental frequency and the number of samples to obtain an accurate power signal, thereby reducing the burden of the system operation.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1. . . Signal synchronization system

11. . . Analog to digital converter

111, 211. . . Power signal

12, 22. . . Processing module

121, 222. . . Baseband

122. . . Number of samples

123. . . Sampling frequency

13. . . Analysis module

2. . . Signal reconstruction system

twenty one. . . Capture module

221. . . Fixed sampling frequency

223. . . difference

224. . . default value

225. . . Resampling frequency

226. . . Error analysis data

227. . . Analytical data

twenty three. . . Reconstruction module

231. . . Rebuilding power signal

232. . . First time interval

233. . . Second time interval

twenty four. . . Spectrum analysis module

241. . . Power signal waveform

25. . . Storage module

S11~S18, S151~S153, A. . . Step flow

Figure 1 is a block diagram of a prior art technique.
Figure 2 is a block diagram of the signal reconstruction system of the present invention.
Figure 3 is the first flow chart of the signal reconstruction method of the present invention.
Figure 4 is a second flow chart of the signal reconstruction method of the present invention.

2. . . Signal reconstruction system

twenty one. . . Capture module

211. . . Power signal

twenty two. . . Processing module

221. . . Fixed sampling frequency

222. . . Baseband

223. . . difference

224. . . default value

225. . . Resampling frequency

226. . . Error analysis data

227. . . Analytical data

twenty three. . . Reconstruction module

231. . . Rebuilding power signal

232. . . First time interval

233. . . Second time interval

twenty four. . . Spectrum analysis module

241. . . Power signal waveform

25. . . Storage module

Claims (15)

A signal reconstruction system comprising:
A capture module that captures a plurality of power signals;
a processing module electrically connecting the capturing module to analyze the power signals to obtain a fundamental frequency, and calculating a frequency of the fundamental frequency and the power signals to obtain an error value, if the error value When the value is less than a preset value, the processing module calculates a resampling frequency according to the fundamental frequency and a fixed sampling frequency;
a reconstruction module electrically connected to the processing module, wherein a reconstructed power signal is calculated according to the resampling frequency;
a spectrum analysis module electrically connecting the processing module and the reconstruction module, analyzing the fundamental frequency and the reconstructed power signal to obtain waveforms of the power signals; and a storage module electrically connecting the The spectrum analysis module stores waveforms of the power signals. The signal reconstruction system of claim 1, wherein the capture module converts the power signals from analog signals to digital signals. The signal reconstruction system of claim 1, wherein if the error value is greater than the preset value, the spectrum analysis module analyzes the fundamental frequency to obtain an error analysis data. The signal reconstruction system of claim 3, wherein the storage module stores the error analysis data. The signal reconstruction system of claim 1, wherein the spectrum analysis module analyzes the fundamental frequency to obtain an analysis data if the error value is less than the preset value. The signal reconstruction system of claim 5, wherein the storage module stores the analysis data. The signal reconstruction system of claim 1, wherein the reconstruction module calculates a reciprocal of the fundamental frequency to obtain a first time interval, and calculates a reciprocal of the resampling frequency to obtain a second time. Interval, and calculating the first time interval and the second time interval by using an interpolation method to obtain the reconstructed power signal. A signal reconstruction method is applicable to a signal reconstruction system, which includes a capture module, a processing module, a reconstruction module, a spectrum analysis module, and a storage module. The signal reconstruction method Contains the following steps:
Taking a plurality of power signals by the capture module;
The processing module analyzes the power signals to obtain a fundamental frequency, and calculates a frequency of the fundamental frequency and the power signals to obtain an error value;
Providing the processing module to calculate a resampling frequency according to the fundamental frequency and a fixed sampling frequency;
Providing the reconstruction module to calculate a reconstructed power signal according to the resampling frequency;
The frequency spectrum and the reconstructed power signal are analyzed by the spectrum analysis module to obtain waveforms of the power signals; and the waveforms of the power signals are stored by the storage module. The signal reconstruction method described in claim 8 of the patent application further includes the following steps:
The power signals are converted from analog signals to digital signals by the capture module. The signal reconstruction method described in claim 8 of the patent application further includes the following steps:
If the error value is greater than a predetermined value, the frequency analysis module analyzes the fundamental frequency to obtain an error analysis data. The signal reconstruction method described in claim 10 of the patent application further includes the following steps:
The error analysis data is stored by the storage module. The signal reconstruction method described in claim 10 of the patent application further includes the following steps:
If the error value is less than the preset value, the spectrum is analyzed by the spectrum analysis module to obtain an analysis data. The signal reconstruction method described in claim 12 of the patent application further includes the following steps:
The analysis data is stored by the storage module. The signal reconstruction method described in claim 8 of the patent application further includes the following steps:
The reciprocal of the fundamental frequency is obtained by the reconstruction module as a first time interval, and the reciprocal of the resampling frequency is obtained as a second time interval. The signal reconstruction method described in claim 14 of the patent application further includes the following steps:
The reconstruction module is configured to calculate the first time interval and the second time interval by using an interpolation method to obtain a reconstructed power signal.