CN102156217A - Method for detecting voltage drop of three-phase power network based on mean-value filter - Google Patents
Method for detecting voltage drop of three-phase power network based on mean-value filter Download PDFInfo
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- CN102156217A CN102156217A CN2011100797829A CN201110079782A CN102156217A CN 102156217 A CN102156217 A CN 102156217A CN 2011100797829 A CN2011100797829 A CN 2011100797829A CN 201110079782 A CN201110079782 A CN 201110079782A CN 102156217 A CN102156217 A CN 102156217A
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Abstract
The invention provides a method for detecting voltage drop of a three-phase power network based on a mean-value filter, comprising the steps of utilizing the mean-value filter to carry out mean-value filtering on d-axis component of the voltage and obtaining the mean value of the d-axis voltage; and judging the drop situation of the voltage in the power network according to the mean value of the d-axis voltage. According to the method, the metering quantity is small and the reliability is high, and a negative-sequence current component can be inhibited when the voltage of power network is unbalanced. The invention provides the method for quickly detecting the voltage drop, can be used for detecting the drop situation of the voltage within the 1/4 commercial electricity period, and is easy to be applied in practical situation, and the metering quantity is small and the reliability is high,.
Description
Technical field
The present invention be more particularly directed to a kind of three phase network electric voltage dropping detection method based on average value filtering.
Background technology
At present, along with new forms of energy generate electricity by way of merging two or more grid systems such as the progressively development of wind-force, photovoltaic etc., MW level combining inverter is used widely.In order to guarantee the stability of electrical network, the demand that low-voltage is passed through (LVRT) has been proposed combining inverter.Pass through in the standard in low pressure, require inverter off-grid not after line voltage falls, and can be in 20ms to the electrical network injecting reactive current to raise line voltage.This is just to claiming the detection time of three phase network electric voltage dropping.It is to be produced by grid short circuit that electrical network falls, and the situation of short circuit is divided into three kinds, is respectively single-phase shorted to earth, phase fault, three-phase shortcircuit.Single-phase shorted to earth produces single-phase falling, and phase fault produces two-phase and falls, and three-phase shortcircuit produces three-phase and falls.As shown in Figure 1, pass through the requirement that response speed is 20ms, need in 10ms, detect electric voltage dropping, make response then in order to satisfy low pressure.If judge, can only detect by 10ms (1/2 civil power cycle) the soonest according to voltage effective value of the prior art.
Summary of the invention
Whether the invention provides a kind of method for quick of electric voltage dropping, can go out to fall in 1/4 civil power cycle detection, and calculated amount is little, the reliability height be used easily in practice.
The present invention is achieved through the following technical solutions technical purpose of the present invention, proposes a kind of three phase network electric voltage dropping detection method, comprises the steps: to adopt averaging filter that voltage d axle component is averaged value filtering, obtains the mean value of d shaft voltage; Judge according to the mean value of above-mentioned d shaft voltage whether line voltage falls.
Preferably, " judging according to the mean value of above-mentioned d shaft voltage whether line voltage falls " is specially: the switching frequency and the mains frequency of sampling inverter are counting of 1/4 civil power periodic voltage; Set up the record array of d shaft voltage; Each sampling period value of averaging is calculated; Judge according to result of calculation whether line voltage falls.
Whether beneficial effect: the invention provides a kind of method for quick of electric voltage dropping, can go out to fall in 1/4 civil power cycle detection, and calculated amount is little, the reliability height be used easily in practice.
Description of drawings
With embodiment the present invention is described in further detail with reference to the accompanying drawings below.
Fig. 1 is a kind of three phase network electric voltage dropping detection method process flow diagram based on average value filtering that the embodiment of the invention 1 proposes;
Fig. 2 is a kind of process flow diagram based on S102 in the three phase network electric voltage dropping detection method of average value filtering that the embodiment of the invention 1 proposes.
Embodiment
Core concept of the present invention is: propose a kind of detection method of the three phase network electric voltage dropping based on average value filtering, when the three-phase circuit short circuit, adopt voltage d axle component to carry out electric voltage dropping and judge.
Embodiment 1
As shown in Figure 2, electrical network is when three-phase shortcircuit, and the d shaft voltage is DC quantity stably, and electrical network is when single-phase short circuit and phase fault, and line voltage is asymmetric, has 2 order harmonic components on the d of voltage axle component.
S101, employing averaging filter average value filtering to voltage d axle component, obtain the mean value of d shaft voltage.
Adopt 1/4 civil power cycle (5ms) averaging filter that voltage d axle component is averaged value filtering, obtain the mean value of d shaft voltage, can filtering 2 order harmonic components.
S102, judge according to the mean value of above-mentioned d shaft voltage whether line voltage falls.
Be specially:
The switching frequency and the mains frequency of S1021, sampling inverter are counting of 1/4 civil power periodic voltage.
S1022, set up the record array of d shaft voltage.
S1023, each value of averaging is calculated in sampling period.
S1024, judge according to result of calculation whether line voltage falls.
Obtain level and smooth DC quantity after the filtering, just can judge by this DC quantity whether line voltage falls.
The present invention is not limited thereto embodiment, based on the related realization assembly of inventive concept all in protection scope of the present invention.
Claims (2)
1. the three phase network electric voltage dropping detection method based on average value filtering is characterized in that, comprises the steps:
Adopt averaging filter that voltage d axle component is averaged value filtering, obtain the mean value of d shaft voltage;
Judge according to the mean value of above-mentioned d shaft voltage whether line voltage falls.
2. the method for claim 1 is characterized in that, " judging according to the mean value of above-mentioned d shaft voltage whether line voltage falls " is specially:
The switching frequency and the mains frequency of sampling inverter are counting of 1/4 civil power periodic voltage;
Set up the record array of d shaft voltage;
Each sampling period value of averaging is calculated;
Judge according to result of calculation whether line voltage falls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100797829A CN102156217A (en) | 2011-03-31 | 2011-03-31 | Method for detecting voltage drop of three-phase power network based on mean-value filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100797829A CN102156217A (en) | 2011-03-31 | 2011-03-31 | Method for detecting voltage drop of three-phase power network based on mean-value filter |
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| CN102156217A true CN102156217A (en) | 2011-08-17 |
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| CN2011100797829A Pending CN102156217A (en) | 2011-03-31 | 2011-03-31 | Method for detecting voltage drop of three-phase power network based on mean-value filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018532A (en) * | 2012-12-13 | 2013-04-03 | 南京安炤电力电子有限公司 | Method and system for high-speed voltage drop detection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05297030A (en) * | 1992-04-17 | 1993-11-12 | Nissin Electric Co Ltd | Detection method of voltage drop |
| CN101793918A (en) * | 2009-11-18 | 2010-08-04 | 中电普瑞科技有限公司 | Voltage sag detection method |
| JP4515937B2 (en) * | 2005-03-03 | 2010-08-04 | 株式会社明電舎 | Voltage drop detection method and apparatus by waveform comparison |
-
2011
- 2011-03-31 CN CN2011100797829A patent/CN102156217A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05297030A (en) * | 1992-04-17 | 1993-11-12 | Nissin Electric Co Ltd | Detection method of voltage drop |
| JP4515937B2 (en) * | 2005-03-03 | 2010-08-04 | 株式会社明電舎 | Voltage drop detection method and apparatus by waveform comparison |
| CN101793918A (en) * | 2009-11-18 | 2010-08-04 | 中电普瑞科技有限公司 | Voltage sag detection method |
Non-Patent Citations (4)
| Title |
|---|
| 周杰: "电压跌落检测的仿真研究", 《继电器》 * |
| 肖冰等: "一种基于派克变换的电压跌落检测改进离散算法", 《继电器》 * |
| 肖湘宁等: "电压凹陷特征量检测算法研究", 《电力自动化设备》 * |
| 龙云: "电压凹陷检测与补偿控制策略的研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018532A (en) * | 2012-12-13 | 2013-04-03 | 南京安炤电力电子有限公司 | Method and system for high-speed voltage drop detection |
| CN103018532B (en) * | 2012-12-13 | 2014-12-31 | 南京安炤电力电子有限公司 | Method and system for high-speed voltage drop detection |
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Application publication date: 20110817 |