CN103823141A - Method for simultaneously measuring qualities of electric energy of multiple alternating current circuits based on digital signals - Google Patents
Method for simultaneously measuring qualities of electric energy of multiple alternating current circuits based on digital signals Download PDFInfo
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- CN103823141A CN103823141A CN201410071549.XA CN201410071549A CN103823141A CN 103823141 A CN103823141 A CN 103823141A CN 201410071549 A CN201410071549 A CN 201410071549A CN 103823141 A CN103823141 A CN 103823141A
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Abstract
The invention provides a method for simultaneously measuring qualities of electric energy of multiple alternating current circuits based on digital signals. By means of the method, the problem that in the prior art, when electric power quality testing is simultaneously conducted on the multiple circuits or multiple voltage-class busses, especially when electric energy quality testing and analyzing are conducted on a 1000 kV alternating current extra-high voltage power grid, multiple electric energy quality testing and analyzing instruments are needed, and therefore simultaneity of measurement data can not be accurately ensured. The method includes the steps of converting multiple analog signals into digital signals, enabling each digital signal obtained through conversion to serve as a data channel under the message format definition according to the message format of a preset communication protocol, outputting a set of digital signals conforming to the preset communication protocol, and enabling the set of digital signals to have access to a digital type electric energy quality measurement device. According to the method, simultaneity and consistency of measurement data of multiple measurement points are ensured, and the electric energy quality related trend and the disturbance event are more accurately analyzed.
Description
Technical field
The present invention relates to Operation of Electric Systems and measure correlative technology field, specifically, the quality of power supply measuring method simultaneously that relates to a kind of many alternating current circuits based on digital signal, the present invention is particularly useful for the quality of power supply of many UHVAC transmission lines and measures simultaneously.
Background technology
At present in electric energy quality test work, in the time many circuits or multiple electric pressure bus being carried out to electric energy quality test, need to adopt many electric energy quality test analyzers simultaneously, cannot accurately guarantee for the simultaneity of measurement data.Especially in the electric energy quality test to 1000kV AC extra high voltage electrical network is analyzed, need to measure many buses of high, medium and low voltage of many circuits or main transformer simultaneously, for the power quality index situation in Accurate Analysis extra-high voltage equipment switching and circuit operational process, test data simultaneity requirement to different measuring point is very high, therefore needs to study and solve the problem of measurement data simultaneity in such cases.
Summary of the invention
The present invention existing while many circuits or multiple electric pressure bus being carried out to electric energy quality test in order to solve simultaneously, especially in the time that the electric energy quality test to 1000kV AC extra high voltage electrical network is analyzed, need to adopt many electric energy quality test analyzers, the problem that cannot accurately guarantee for the simultaneity of measurement data, provides a kind of simultaneously measuring method of the quality of power supply of many alternating current circuits based on digital signal.
Technical scheme of the present invention is as follows:
The quality of power supply of many alternating current circuits based on digital signal is a measuring method simultaneously, it is characterized in that, comprises the steps:
1, multiple analog signalses of many measured alternating current circuits are drawn by p-wire, and multiple input end of analog signal of unified access analog-digital conversion equipment;
2, first analog-digital conversion equipment is converted to digital signal by multiple simulating signals, again according to the message format of predetermined communication protocol, a data channel using the each digital signal after conversion under described message format definition, output meets predetermined communication protocol set of number signal, then by described set of number signal access digital electric power apparatus for measuring quality;
3, digital electric power apparatus for measuring quality is resolved described set of number signal according to predetermined communication protocol, and the data channel that belongs to same alternating current circuit is sorted out, and finally obtains the power quality data of many alternating current circuits simultaneously.
In the present invention, described analog-digital conversion equipment, comprising:
Gather the analog quantity acquisition circuit of many alternating current circuit analog signalses;
Receive the simulating signal of analog quantity acquisition circuit collection and carry out analog-to-digital analog-to-digital conversion module;
According to the message format of predetermined communication protocol, a data channel using the each digital signal after analog-to-digital conversion module conversion under described message format definition, output meets the central processing unit of predetermined communication protocol set of number signal;
By the digital output module of described set of number signal access digital electric power apparatus for measuring quality.
In the present invention, described analog quantity acquisition circuit comprises Hall element and isolated amplifier; The precision of described analog-to-digital conversion module is greater than 16bit; Described digital output module is optical fiber interface.
In the present invention, in described step 2, described predetermined communication protocol is IEC61850.
In the present invention, in described step 2, be one group of analog signals by the three-phase voltage of every alternating current circuit and three-phase current, in the set of number signal of exporting according to predetermined communication protocol, be defined as wherein 6 data channel.
In the present invention, in described step 3, described power quality data comprises voltage, frequency, electric current, harmonic wave, flickering, the three-phase imbalance index of every alternating current circuit.
In the frequency analysis of described every alternating current circuit, adopt DFT algorithm to analyze.
The present invention is based on the quality of power supply measuring method simultaneously of many alternating current circuits of digital signal, utilize the Integrated Trait of digital signal, be modulated into set of number signal by organizing analog signals more, utilize a digital electric energy quality measurement device can carry out test analysis, greatly save surveying instrument, reduce by many surveying instruments simultaneously and measured the workload of wiring, setting and data analysis, and simultaneity and the consistance of multiple measurement point test datas are guaranteed, for analyzing the relevant trend of the quality of power supply, disturbance event aspect is more accurate.
Accompanying drawing explanation
Fig. 1 is the process schematic diagram of measuring method of the present invention.
Fig. 2 is the structural representation of analog-digital conversion equipment of the present invention.
Embodiment
Referring to Fig. 1 and Fig. 2, the present invention is based on the quality of power supply measuring method simultaneously of many alternating current circuits of digital signal, first multiple analog signalses of many measured alternating current circuits are drawn by p-wire, here, many alternating current circuits can be common alternating current circuits, many circuits in 1000kV AC extra high voltage electrical network or many buses of high, medium and low voltage of main transformer etc., after multiple analog signalses of many alternating current circuits are drawn, multiple input end of analog signal of unified access analog-digital conversion equipment.
Analog-digital conversion equipment is the core component of method of testing indispensability of the present invention, and it comprises:
Analog quantity acquisition circuit, analog quantity acquisition circuit is responsible for gathering the analog signals of many alternating current circuits, multiple input end of analog signal of analog-digital conversion equipment are ingredients of analog quantity acquisition circuit, analog quantity acquisition circuit also comprises Hall element and isolated amplifier, to avoid distorted signals, because Hall element is less to high-frequency signal isolation, the reduction of accomplishing raw data that can maximum capacity, simulating signal is by Hall element and isolated amplifier access, and alternating current-direct current signal all can the progress of disease.
Analog-to-digital conversion module, multiple analog signalses that analog-to-digital conversion module receives many alternating current circuits of analog quantity acquisition circuit collection carry out analog to digital conversion, output digit signals, D/A converter module can adopt analog-to-digital conversion module more than technical grade high precision 16bit to carry out analog to digital conversion, guarantee the conversion accuracy of simulating signal, under this structure, farthest guarantee the accuracy of quality of power supply measurement data.
Central processing unit, central processing unit is the core of analog-digital conversion equipment, it is according to the message format of predetermined communication protocol, a data channel using the each digital signal after analog-to-digital conversion module conversion under described message format definition, output meets predetermined communication protocol set of number signal.Here, predetermined communication protocol can be IEC61850 series, is preferably and adopts IEC61850-9-2, will mention the sample frequency of digital signal at this, conventionally digital signal be sampled as equal interval sampling, each cycle sampling number is fixed value.
The definition of digital output signal message format, the method fundamental purpose is to solve many group analog signalses to measure problem simultaneously, therefore should determine according to the quantity of actual measured signal the port number of digital signal in the definition link of message format, three-phase voltage (the Ua1 of for example every alternating current circuit, Ub1, and three-phase current (Ia1 Uc1), Ib1, Ic1) be one group of analog signals, to take 6 passages, in the set of number signal of exporting according to predetermined communication protocol, be defined as wherein 6 data channel, in the time measuring 3 groups of analog signalses (three alternating current circuit), port number should be no less than 18.
Digital output module, its effect is that for purposes of the present invention, digital output module is preferably employing optical fiber interface by set of number signal access digital electric power apparatus for measuring quality after treatment process central processing unit.
Digital electric power apparatus for measuring quality receives after aforesaid set of number signal, according to predetermined communication protocol, set of number signal is resolved, and the data channel that belongs to same alternating current circuit is sorted out, draw respectively the power quality data of every alternating current circuit, finally obtain the power quality data of many alternating current circuits simultaneously.Power quality data comprises the indexs such as the voltage, frequency, electric current, harmonic wave, flickering, three-phase imbalance of every alternating current circuit.
Digital electric power apparatus for measuring quality is different from traditional analog signal measurement apparatus in the time carrying out frequency analysis, traditional measurement device has phase-locked link, can guarantee in the time that system frequency changes, the sampling number of every cycle is constant, thereby adopt DFT or fft algorithm to carry out frequency analysis, wherein the sampling number of fft algorithm requirement analytical cycle is 2N.And being sampled as uniformly-spaced or the sampling of the speed such as title of digital signal, in the time that system frequency changes, changing may appear in the sampling number of every cycle, cannot guarantee that sampling number is 2N, therefore in the time carrying out frequency analysis, fft algorithm just cannot be suitable for, and adopt DFT or other optimized algorithms to analyze.
Adopt mensuration of the present invention to test many alternating current circuits, reduce by many surveying instruments and measured the workload of wiring, setting and data analysis, and guarantee the simultaneity of multiple measurement point test datas, for analyzing the relevant trend of the quality of power supply, disturbance event aspect is more accurate.
Claims (9)
1. the quality of power supply of many alternating current circuits based on digital signal measuring method simultaneously, is characterized in that, comprises the steps:
1) multiple analog signalses of many measured alternating current circuits are drawn by p-wire, and multiple input end of analog signal of unified access analog-digital conversion equipment;
2) first analog-digital conversion equipment is converted to digital signal by multiple simulating signals, again according to the message format of predetermined communication protocol, a data channel using the each digital signal after conversion under described message format definition, output meets predetermined communication protocol set of number signal, then by described set of number signal access digital electric power apparatus for measuring quality;
3) digital electric power apparatus for measuring quality is resolved described set of number signal according to predetermined communication protocol, and the data channel that belongs to same alternating current circuit is sorted out, and finally obtains the power quality data of many alternating current circuits simultaneously.
2. the quality of power supply of many alternating current circuits based on digital signal according to claim 1 measuring method simultaneously, is characterized in that: described analog-digital conversion equipment, comprising:
Gather the analog quantity acquisition circuit of many alternating current circuit analog signalses;
Receive the simulating signal of analog quantity acquisition circuit collection and carry out analog-to-digital analog-to-digital conversion module;
According to the message format of predetermined communication protocol, a data channel using the each digital signal after analog-to-digital conversion module conversion under described message format definition, output meets the central processing unit of predetermined communication protocol set of number signal;
By the digital output module of described set of number signal access digital electric power apparatus for measuring quality.
3. the quality of power supply of many alternating current circuits based on digital signal according to claim 2 measuring method simultaneously, is characterized in that: described analog quantity acquisition circuit comprises Hall element and isolated amplifier.
4. the quality of power supply of many alternating current circuits based on digital signal according to claim 2 measuring method simultaneously, is characterized in that: the precision of described analog-to-digital conversion module is greater than 16bit.
5. the quality of power supply of many alternating current circuits based on digital signal according to claim 2 measuring method simultaneously, is characterized in that: described digital output module is optical fiber interface.
6. the quality of power supply of many alternating current circuits based on digital signal according to claim 1 measuring method simultaneously, is characterized in that: described step 2) in, described predetermined communication protocol is IEC61850.
7. the quality of power supply of many alternating current circuits based on digital signal according to claim 1 measuring method simultaneously, it is characterized in that: described step 2) in, be one group of analog signals by the three-phase voltage of every alternating current circuit and three-phase current, in the set of number signal of exporting according to predetermined communication protocol, be defined as wherein 6 data channel.
8. the quality of power supply of many alternating current circuits based on digital signal according to claim 1 measuring method simultaneously, it is characterized in that: in described step 3), described power quality data comprises voltage, frequency, electric current, harmonic wave, flickering, the three-phase imbalance index of every alternating current circuit.
9. the quality of power supply of many alternating current circuits based on digital signal according to claim 8 measuring method simultaneously, is characterized in that: in the frequency analysis of described every alternating current circuit, adopt DFT algorithm to analyze.
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| JPS63245850A (en) * | 1987-03-31 | 1988-10-12 | Shimadzu Corp | Metastable ion energy analyzer |
| CN201788233U (en) * | 2009-09-25 | 2011-04-06 | 黑龙江硕实电力科技有限公司 | Electric energy quality harmonic and over-voltage on-line monitoring device |
| CN202008526U (en) * | 2011-03-07 | 2011-10-12 | 安徽省电力科学研究院 | Accuracy verification system for digital signal based electric energy quality measurement device |
| CN102565583A (en) * | 2012-01-04 | 2012-07-11 | 天津市电力公司 | Power quality monitoring terminal for switch-in electronic mutual inductor |
| CN202453437U (en) * | 2012-02-24 | 2012-09-26 | 烟台东方威思顿电气有限公司 | Multi-loop electric energy quality on-line monitoring device |
| CN103185835A (en) * | 2013-03-28 | 2013-07-03 | 国家电网公司 | Electric energy metering device with electric energy quality monitoring function |
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2014
- 2014-02-28 CN CN201410071549.XA patent/CN103823141A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63245850A (en) * | 1987-03-31 | 1988-10-12 | Shimadzu Corp | Metastable ion energy analyzer |
| CN201788233U (en) * | 2009-09-25 | 2011-04-06 | 黑龙江硕实电力科技有限公司 | Electric energy quality harmonic and over-voltage on-line monitoring device |
| CN202008526U (en) * | 2011-03-07 | 2011-10-12 | 安徽省电力科学研究院 | Accuracy verification system for digital signal based electric energy quality measurement device |
| CN102565583A (en) * | 2012-01-04 | 2012-07-11 | 天津市电力公司 | Power quality monitoring terminal for switch-in electronic mutual inductor |
| CN202453437U (en) * | 2012-02-24 | 2012-09-26 | 烟台东方威思顿电气有限公司 | Multi-loop electric energy quality on-line monitoring device |
| CN103185835A (en) * | 2013-03-28 | 2013-07-03 | 国家电网公司 | Electric energy metering device with electric energy quality monitoring function |
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