CN105759116A - Low-voltage power line power grid frequency collection device and frequency measurement algorithm - Google Patents
Low-voltage power line power grid frequency collection device and frequency measurement algorithm Download PDFInfo
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- CN105759116A CN105759116A CN201610229051.0A CN201610229051A CN105759116A CN 105759116 A CN105759116 A CN 105759116A CN 201610229051 A CN201610229051 A CN 201610229051A CN 105759116 A CN105759116 A CN 105759116A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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Abstract
The invention relates to a low-voltage power line power grid frequency collection device and a frequency measurement algorithm. The collection device comprises a control center, a power supply management module, a precise voltage transformer module, a signal conditioning module and an anti-aliasing filtering module. The precise voltage transformer module is used for coupling alternating current signals on a low-voltage power line, the direct current bias is improved by the signal conditioning module, the coupled alternating current signals enter the anti-aliasing filtering module and then enter an ADC circuit after the anti-aliasing filtering module filters out most harmonic interference signals, the ADC circuit converts analog signals into digital signals, the collected data is converted by the ADC circuit and is used to calculate the frequency in a power grid by means of the frequency measurement algorithm, and the measured data is transmitted to a PC upper computer and is stored into a database. According to the invention, the power network frequency parameter can be precisely and rapidly detected, the operation condition of the power grid is accurately estimated, the electric power system is enabled to operate under a safe and stable environment, and the ordered electric power production life is ensured.
Description
[technical field]
The present invention relates to a kind of low-voltage power line mains frequency harvester and Frequency Measurement Algorithm, belong to the acquisition technique field of mains frequency.
[background technology]
At present, the environment of China's low voltage electric network is more complicated, there is serious multi-path jamming and complicated noise, and society also rarely has the technology that on detection electric lines of force, electrical network frequency accuracy is fast at high speed.Therefore develop the grid frequency measurement device of a high accuracy fast speed, it is possible to understand the ruuning situation of electrical network in real time, understand the use state of each electrical appliance in electrical network, it is ensured that the operation of electricity net safety stable, it is ensured that being normally carried out of power generation.
[summary of the invention]
It is an object of the invention to: for the interference of power loads various in existing low voltage electric network and work in the potential safety hazard that under abnormal condition, electrical appliance exists, the present invention provides a kind of low-voltage power line mains frequency harvester and Frequency Measurement Algorithm, the detection electric power networks frequency parameter of high accuracy fast speed, accurately estimate grid operating conditions, guarantee that power system runs under safety and stability environment, it is ensured that power generation life carries out in order.
For achieving the above object, the technical solution used in the present invention is:
A kind of low-voltage power line mains frequency harvester, including control centre, power management module, accurate voltage mutual inductor module, Signal-regulated kinase and anti-aliasing filter module, accurate voltage mutual inductor module is for coupling the AC signal on low-voltage power line, direct current biasing is raised by Signal-regulated kinase, enter Anti-aliasing Filter Circuits, adc circuit is entered after filtering most harmonic interference signals by anti-aliasing filter module, it is digital signal by adc circuit by analog-signal transitions, the data collected data after adc circuit is changed are calculated the frequency in electrical network by Frequency Measurement Algorithm, the data recorded are passed to PC host computer and is saved into data base.
In the present invention: described power management module adopts special power supply chip M7805 and ICL7660A, and the 9V voltage of input is converted to 5V and 3.3V voltage.
In the present invention: described accurate voltage mutual inductor module adopts ZMPT107 chip, it is possible to directly connects 220V alternating voltage, and it can be narrowed down to 3V.
In the present invention: the low pass filter of described anti-aliasing filter module employing 300HZ, described control centre's employing MSP430G2553 single-chip microcomputer, the highest 200KPS that can reach of sample frequency, stable.
A kind of Frequency Measurement Algorithm of low-voltage power line mains frequency harvester, its Frequency Measurement Algorithm is as follows:
, receive ADC and collected the magnitude of voltage of N point；
, simply rightSeek its auto-correlation function and rightDifferentiate
；
, right respectivelyWithAdd Hamming window to obtainWithTo reduce spectral leakage
；
, right respectivelyWithN point DFT is asked to obtainWith
；
, askWithMaximum modulus valueWith
；
, basisThe decimation factor asked
；
, frequency must be recorded
。
After adopting said method, present invention have the beneficial effect that
1, the present invention is reasonable in design, simple to operate, the detection electric power networks frequency parameter of high accuracy fast speed, accurately estimates grid operating conditions, it is ensured that power system runs under safety and stability environment, it is ensured that power generation life carries out in order；
2, the present invention can solve the problem that in electrical network, higher hamonic wave interference is bigger, but also improves the rapidity in detection process and accuracy better such that it is able to reaches to overcome the purpose of the hidden danger of existing low voltage electric network；
3, can be not only used in low voltage electric network, it is also possible to realize in middle pressure and high-voltage electric power system；
4, the present invention gathers signal accurately, and cost is low, distinctive Frequency Measurement Algorithm, can quickly calculate the frequency data of signal according to required precision.
[accompanying drawing explanation]
Accompanying drawing described herein is used to provide a further understanding of the present invention, constitutes the part of the application, but is not intended that inappropriate limitation of the present invention, in the accompanying drawings:
Fig. 1 is principles of the invention schematic diagram；
Fig. 2 is power management module circuit theory diagrams in the present invention；
Fig. 3 is accurate voltage mutual inductor modular circuit schematic diagram in the present invention；
Fig. 4 is Signal-regulated kinase circuit theory diagrams in the present invention；
Fig. 5 is anti-aliasing filter modular circuit schematic diagram in the present invention；
Fig. 6 is control centre's circuit theory diagrams in the present invention.
[detailed description of the invention]
Describe the present invention, illustrative examples therein and explanation in detail below in conjunction with accompanying drawing and specific embodiment to be only used for explaining the present invention, but not as a limitation of the invention.
As shown in figures 1 to 6, a kind of low-voltage power line mains frequency harvester, including control centre, power management module, accurate voltage mutual inductor module, Signal-regulated kinase and anti-aliasing filter module, accurate voltage mutual inductor module is for coupling the AC signal on low-voltage power line, direct current biasing is raised by Signal-regulated kinase, enter Anti-aliasing Filter Circuits, adc circuit is entered after filtering most harmonic interference signals by anti-aliasing filter module, it is digital signal by adc circuit by analog-signal transitions, the data collected data after adc circuit is changed are calculated the frequency in electrical network by Frequency Measurement Algorithm, the data recorded are passed to PC host computer and is saved into data base.Described power management module adopts special power supply chip M7805 and ICL7660A, and the 9V voltage of input is converted to 5V and 3.3V voltage；Described accurate voltage mutual inductor module adopts ZMPT107 chip, it is possible to directly connects 220V alternating voltage, and it can be narrowed down to 3V；The low pass filter of described anti-aliasing filter module employing 300HZ, described control centre's employing MSP430G2553 single-chip microcomputer, the highest 200KPS that can reach of sample frequency, stable.
A kind of Frequency Measurement Algorithm of low-voltage power line mains frequency harvester, its Frequency Measurement Algorithm is as follows:
, receive ADC and collected the magnitude of voltage of N point；
, simply rightSeek its auto-correlation function and rightDifferentiate
；
, right respectivelyWithAdd Hamming window to obtainWithTo reduce spectral leakage
；
, right respectivelyWithN point DFT is asked to obtainWith
；
, askWithMaximum modulus valueWith
；
, basisThe decimation factor asked
；
, frequency must be recorded
。
Wherein: (1).: the data n ∈ that receives [0, N)；
(2) .N: once-through operation sampling N point data；
(3) .PI:3.2415926；
(4).: sample frequency.
The present invention can be not only used in low voltage electric network, it is also possible to realizes in middle pressure and high-voltage electric power system.
As: in high-voltage transmission network, owing in power plant, the reason of generator speed makes mains frequency change, the quality of power supply of transmission is destroyed, now need resolute to take measures so that mains frequency is revised, by using this device can quickly know the situation of change of mains frequency, it is ensured that the safe operation of electrical network.
Above the specific embodiment of the present invention is described, but the present invention is not limited to above description.For a person skilled in the art, any equal amendment to the technical program and replacement are all within the scope of the invention.Therefore, the equalization made without departing from the spirit and scope of the invention converts and amendment, all should contain within the scope of the invention.
Claims (5)
1. a low-voltage power line mains frequency harvester, it is characterized in that: include control centre, power management module, accurate voltage mutual inductor module, Signal-regulated kinase and anti-aliasing filter module, accurate voltage mutual inductor module is for coupling the AC signal on low-voltage power line, direct current biasing is raised by Signal-regulated kinase, enter Anti-aliasing Filter Circuits, adc circuit is entered after filtering most harmonic interference signals by anti-aliasing filter module, it is digital signal by adc circuit by analog-signal transitions, the data collected data after adc circuit is changed are calculated the frequency in electrical network by Frequency Measurement Algorithm, the data recorded are passed to PC host computer and is saved into data base.
2. a kind of low-voltage power line mains frequency harvester according to claim 1, it is characterised in that described power management module adopts special power supply chip M7805 and ICL7660A, and the 9V voltage of input is converted to 5V and 3.3V voltage.
3. a kind of low-voltage power line mains frequency harvester according to claim 1, it is characterised in that described accurate voltage mutual inductor module adopts ZMPT107 chip, it is possible to directly connects 220V alternating voltage, and it can be narrowed down to 3V.
4. a kind of low-voltage power line mains frequency harvester according to claim 1, it is characterized in that, described anti-aliasing filter module adopts the low pass filter of 300HZ, and described control centre adopts MSP430G2553 single-chip microcomputer, the highest 200KPS that can reach of sample frequency, stable.
5. the Frequency Measurement Algorithm of a low-voltage power line mains frequency harvester, it is characterised in that Frequency Measurement Algorithm is as follows:
, receive ADC and collected the magnitude of voltage of N point；
, simply rightSeek its auto-correlation function and rightDifferentiate
；
, right respectivelyWithAdd Hamming window to obtainWithTo reduce spectral leakage
；
, right respectivelyWithN point DFT is asked to obtainWith
；
, askWithMaximum modulus valueWith
；
, basisThe decimation factor asked
；
, frequency must be recorded
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610229051.0A CN105759116A (en) | 2016-04-14 | 2016-04-14 | Low-voltage power line power grid frequency collection device and frequency measurement algorithm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610229051.0A CN105759116A (en) | 2016-04-14 | 2016-04-14 | Low-voltage power line power grid frequency collection device and frequency measurement algorithm |
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| CN105759116A true CN105759116A (en) | 2016-07-13 |
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| CN201610229051.0A Pending CN105759116A (en) | 2016-04-14 | 2016-04-14 | Low-voltage power line power grid frequency collection device and frequency measurement algorithm |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228980A (en) * | 2017-06-06 | 2017-10-03 | 北京智芯微电子科技有限公司 | A kind of method and device for measuring mains frequency |
| CN112968702A (en) * | 2021-01-21 | 2021-06-15 | 许继集团有限公司 | Processing system and method for improving sampling precision of ADC (analog to digital converter) small signal in processor |
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| CN103048539A (en) * | 2012-12-28 | 2013-04-17 | 南京工程学院 | Accurate acquisition device and method of power frequency in audio forensics |
| CN203037739U (en) * | 2012-12-28 | 2013-07-03 | 南京工程学院 | Accurate acquisition device of power grid frequency in audio forensics |
| CN103257271A (en) * | 2013-05-16 | 2013-08-21 | 南京工程学院 | Device and method for detecting micro grid harmonic wave and inter-harmonics based on STM32F107VCT6 |
| CN204116446U (en) * | 2014-08-28 | 2015-01-21 | 辽宁荣信电气传动技术有限责任公司 | A kind of voltage for high voltage converter and frequency measuring equipment |
| CN104330626A (en) * | 2014-10-08 | 2015-02-04 | 国家电网公司 | Power grid harmonic wave monitor |
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2016
- 2016-04-14 CN CN201610229051.0A patent/CN105759116A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048539A (en) * | 2012-12-28 | 2013-04-17 | 南京工程学院 | Accurate acquisition device and method of power frequency in audio forensics |
| CN203037739U (en) * | 2012-12-28 | 2013-07-03 | 南京工程学院 | Accurate acquisition device of power grid frequency in audio forensics |
| CN103257271A (en) * | 2013-05-16 | 2013-08-21 | 南京工程学院 | Device and method for detecting micro grid harmonic wave and inter-harmonics based on STM32F107VCT6 |
| CN204116446U (en) * | 2014-08-28 | 2015-01-21 | 辽宁荣信电气传动技术有限责任公司 | A kind of voltage for high voltage converter and frequency measuring equipment |
| CN104330626A (en) * | 2014-10-08 | 2015-02-04 | 国家电网公司 | Power grid harmonic wave monitor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228980A (en) * | 2017-06-06 | 2017-10-03 | 北京智芯微电子科技有限公司 | A kind of method and device for measuring mains frequency |
| CN107228980B (en) * | 2017-06-06 | 2020-09-08 | 北京智芯微电子科技有限公司 | Method and device for measuring power grid frequency |
| CN112968702A (en) * | 2021-01-21 | 2021-06-15 | 许继集团有限公司 | Processing system and method for improving sampling precision of ADC (analog to digital converter) small signal in processor |
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Application publication date: 20160713 |
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