CN105301522A - Detection method of three-phase mains supply power failure - Google Patents
Detection method of three-phase mains supply power failure Download PDFInfo
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- CN105301522A CN105301522A CN201510808297.9A CN201510808297A CN105301522A CN 105301522 A CN105301522 A CN 105301522A CN 201510808297 A CN201510808297 A CN 201510808297A CN 105301522 A CN105301522 A CN 105301522A
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Abstract
The invention relates to a detection method of a three-phase mains supply power failure, wherein instant values of a three-phase mains supply voltages are sampled in real time, simple logic computation is carried out to the instant values of the three-phase mains supply voltages, and a voltage difference is obtained; and a correct threshold interval of the three-phase mains supply voltage is determined according an effective value of the three-phase mains supply voltage, and whether the voltage difference stays within the threshold interval is determined in order to quickly determine whether the three-phase mains supply voltage is powered off. The invention provides a method for quickly and reliably detecting mains supply abnormities, wherein whether the power failure or a default phase happens to a mains supply can be quickly determined through the simple computation based on real-time sampling of the mains supply voltages.
Description
Technical field
The present invention relates to electric supply method for detecting abnormality field, the detection method of particularly a kind of three-phase mains power down.
Background technology
Static change-over switch in uninterruptible power system is in primary power duty at ordinary times, abnormal (as power down at primary power, phase shortage) time, static change-over switch switches to standby power supply duty fast, therefore, how detecting again the power down of interchange input source fast exactly, reduce detection time as much as possible, is technology point and the difficult point of the application of static change-over switch.If detection time is long, load can be caused to quit work; If detect too fast, easily there is erroneous judgement, cause main power supply frequently to switch, reduce static change-over switch serviceable life.Current three-phase supply detects and usually uses following detection method:
Method one, setting-out detection method.The instantaneous voltage value sampled compares with the limit value in software, when occurring that magnitude of voltage is lower than limit value continuously, then thinks electric network power-fail.The method is not suitable for the line voltage detecting system of three-phase four-wire system, and when zero crossing, there is blind spot, can not effectively judge, and software defined value and actual to exchange input waveform relevant, software decision logic complexity, is unfavorable for promoting the use of;
Method two, sine table detection method.Respective point in sine table in the instantaneous voltage value sampled and software compares, and when occurring that magnitude of voltage is less than the respective value in sine table continuously, then thinks electric network power-fail.The method is locked in grid phase based on completing, and make and three-phase five-wire mode system although can be suitable for three-phase four, when zero crossing, actual value is close with fiducial value equally, there is blind spot, easily causes erroneous judgement, so judge that the time can corresponding increase.
Method three, the instantaneous value of three-phase alternating voltage that will sample, carry out PARK conversion and CLARK conversion, obtain the electric parameter under different coordinate, finally corresponding with fixing voltage range lower limit according to calculated electric parameter electric parameter of determining compares, and judges whether phase shortage.Although the method can be suitable for three-phase four and make and three-phase five-wire mode system; But because the method is for guaranteeing dependable performance; fixing voltage range lower limit can arrange lower usually; so when three-phase input voltage is higher; after single-phase power down; the amplitude calculated needs time of more growing could be lower than fixing voltage range lower limit; cause the judgement time obviously to lengthen, judge that the time unstable, can not adapt to this fast switching system of static change-over switch.
Summary of the invention
In view of this, the object of this invention is to provide the detection method of a kind of three-phase mains power down, by real-time sampling line voltage, and judge civil power whether power down or phase shortage fast by simple calculations.
The present invention adopts following scheme to realize: the detection method of a kind of three-phase mains power down, comprises the following steps:
Step S1: real-time sampling three-phase mains instantaneous voltage Ua, Ub, Uc;
Step S2: the voltage difference Ux calculating the maxima and minima in three-phase mains instantaneous voltage Ua, Ub, Uc in real time;
Step S3: judge whether Ux is less than the voltage threshold Ud of setting, if Ux < is Ud, enters step S4, otherwise enter step S5;
Step S4: power down counter Cnt adds 1;
Step S5: power down counter Cnt resets, and returns step S1;
Step S6: judge whether power down counter Cnt is more than or equal to power down count threshold Cmax, Cmax=t*f, if Cnt >=Cmax, then judge civil power power down, otherwise return step S1;
Wherein, f is three-phase mains sample frequency, and 1kHz≤f≤40kHz, t is detection of power loss filter filtering time, 2ms≤t≤5ms.
Further, the setting of described voltage threshold Ud comprises the following steps:
Step S21: sampling three-phase line voltage instantaneous value Ua, Ub, Uc;
Step S22: the effective value Urms calculating three-phase mains voltage;
Step S23: calculate voltage threshold Ud, Ud=Urms*1.414*K
Wherein, 0.8≤K≤1.2.
The instantaneous value of method real-time sampling three-phase mains of the present invention voltage, carries out simple logic computing to three-phase mains instantaneous voltage, draws a voltage difference; Simultaneously according to the effective value of three-phase mains voltage, determine the threshold interval that three-phase mains voltage is correct, judge whether this voltage difference is in threshold interval thus judges the whether power down of three-phase mains voltage.Compared with prior art, beneficial effect of the present invention is:
1, the decision logic of this detection method is simple, takies cpu resource very little, improves speed and the reliability of detection of power loss;
2, this detection method can realize the accurate detection of the power down of any phase in three-phase mains and combination thereof, avoids the erroneous judgement of prior art, improves the accuracy of detection of power loss;
3, this detection method according to different three-phase mains voltage, can determine that different voltage thresholds is interval, ensures that power-supply system can have identical detection time under different working conditions, improves power system stability.
Accompanying drawing explanation
Fig. 1 is the system flowchart of the detection method of a kind of three-phase mains power down of the present invention.
Fig. 2 is the calculation flow chart of voltage threshold Ud in detection method of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Embodiment one
A detection method for three-phase mains power down, as shown in Figure 1, comprises the following steps:
Step S1: real-time sampling three-phase mains instantaneous voltage Ua, Ub, Uc;
Step S2: the voltage difference Ux calculating the maxima and minima in three-phase mains instantaneous voltage Ua, Ub, Uc in real time;
Step S3: judge whether Ux is less than the voltage threshold Ud of setting, if Ux < is Ud, enters step S4, otherwise enter step S5;
Step S4: power down counter Cnt adds 1;
Step S5: power down counter Cnt resets, and returns step 1;
Step S6: judge whether power down counter Cnt is more than or equal to power down count threshold Cmax, if Cnt >=Cmax, t=2ms, f=20kHz, then Cmax=40, then judge civil power power down, otherwise return step S1.
In the present embodiment, as shown in Figure 2, the setting of described voltage threshold Ud comprises the following steps:
Step S21: sampling three-phase line voltage instantaneous value Ua, Ub, Uc;
Step S22: the effective value Urms calculating three-phase mains voltage, and the normal range of voltage difference Ux is (Urms*1.414*1.5, Urms*1.414*1.73);
Step S23: calculate voltage threshold Ud, Ud=Urms*1.414*0.8;
Embodiment two
A detection method for three-phase mains power down, as shown in Figure 1, comprises the following steps:
Step S1: real-time sampling three-phase mains instantaneous voltage Ua, Ub, Uc;
Step S2: the voltage difference Ux calculating the maxima and minima in three-phase mains instantaneous voltage Ua, Ub, Uc in real time;
Step S3: judge whether Ux is less than the voltage threshold Ud of setting, if Ux < is Ud, enters step S4, otherwise enter step S5;
Step S4: power down counter Cnt adds 1;
Step S5: power down counter Cnt resets, and returns step 1;
Step S6: judge whether power down counter Cnt is more than or equal to power down count threshold Cmax, if Cnt >=Cmax, t=3ms, f=20kHz, then Cmax=60, then judge civil power power down, otherwise return step S1.
In the present embodiment, as shown in Figure 2, the setting of described voltage threshold Ud comprises the following steps:
Step S21: sampling three-phase line voltage instantaneous value Ua, Ub, Uc;
Step S22: the effective value Urms calculating three-phase mains voltage;
Step S23: calculate voltage threshold Ud, Ud=Urms*1.414*0.8;
In the present invention, corresponding to the span of power down count threshold Cmax, filtering time is between 2ms ~ 5ms, according to the functional requirement of different application scenarios to detection of power loss, can carry out suitable adjustment to Cmax.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (2)
1. a detection method for three-phase mains power down, is characterized in that, comprises the following steps:
Step S1: real-time sampling three-phase mains instantaneous voltage Ua, Ub, Uc;
Step S2: the voltage difference Ux calculating the maxima and minima in three-phase mains instantaneous voltage Ua, Ub, Uc in real time;
Step S3: judge whether Ux is less than the voltage threshold Ud of setting, if Ux < is Ud, enters step S4, otherwise enter step S5;
Step S4: power down counter Cnt adds 1;
Step S5: power down counter Cnt resets, and returns step S1;
Step S6: judge whether power down counter Cnt is more than or equal to power down count threshold Cmax, Cmax=t*f, if Cnt >=Cmax, then judge civil power power down, otherwise return step S1;
Wherein, f is three-phase mains sample frequency, and 1kHz≤f≤40kHz, t is detection of power loss filter filtering time, 2ms≤t≤5ms.
2. the detection method of a kind of three-phase mains power down according to claim 1, is characterized in that: the setting of described voltage threshold Ud comprises the following steps:
Step S21: sampling three-phase line voltage instantaneous value Ua, Ub, Uc;
Step S22: the effective value Urms calculating three-phase mains voltage;
Step S23: calculate voltage threshold Ud, Ud=Urms*1.414*K
Wherein, 0.8≤K≤1.2.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107843808A (en) * | 2017-10-17 | 2018-03-27 | 厦门科华恒盛股份有限公司 | A kind of power failure detection method and device of power network hangover |
| CN109164293A (en) * | 2018-07-10 | 2019-01-08 | 深圳市华宝新能源股份有限公司 | A kind of alternating current power failure detection method, electronic equipment, storage medium and energy-storage system |
| CN109521284A (en) * | 2018-10-24 | 2019-03-26 | 杜育宽 | Three-phase electricity power failure detection method based on dual factors algorithm |
| CN109613452A (en) * | 2018-11-29 | 2019-04-12 | 奥克斯空调股份有限公司 | The power-off protection method of AC power source power failure detection method, DC frequency-changeable compressor |
| CN109633246A (en) * | 2018-12-11 | 2019-04-16 | 北京汇能精电科技股份有限公司 | Alternating current power failure detection method, apparatus and system |
| CN112033045A (en) * | 2020-08-17 | 2020-12-04 | 珠海格力电器股份有限公司 | Control method and device of heating equipment and controller |
| CN112816913A (en) * | 2021-01-28 | 2021-05-18 | 厦门拓宝科技有限公司 | Method and device for rapidly detecting power failure of single-phase alternating voltage signal, storage medium, program product and terminal equipment |
| CN113263939A (en) * | 2021-07-19 | 2021-08-17 | 宁波均胜新能源汽车技术有限公司 | Automobile charging pile power supply method and charging pile |
| CN114295887A (en) * | 2021-12-22 | 2022-04-08 | 科德数控股份有限公司 | Power failure detection method |
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| US20040008550A1 (en) * | 2002-05-27 | 2004-01-15 | Young-Jae Son | Circuits and methods for screening for defective memory cells in semiconductor memory devices |
| CN102005812A (en) * | 2009-09-01 | 2011-04-06 | 北京动力源科技股份有限公司 | Method and device for judging alternating current power failure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107843808A (en) * | 2017-10-17 | 2018-03-27 | 厦门科华恒盛股份有限公司 | A kind of power failure detection method and device of power network hangover |
| CN109164293A (en) * | 2018-07-10 | 2019-01-08 | 深圳市华宝新能源股份有限公司 | A kind of alternating current power failure detection method, electronic equipment, storage medium and energy-storage system |
| CN109521284A (en) * | 2018-10-24 | 2019-03-26 | 杜育宽 | Three-phase electricity power failure detection method based on dual factors algorithm |
| CN109613452A (en) * | 2018-11-29 | 2019-04-12 | 奥克斯空调股份有限公司 | The power-off protection method of AC power source power failure detection method, DC frequency-changeable compressor |
| CN109633246A (en) * | 2018-12-11 | 2019-04-16 | 北京汇能精电科技股份有限公司 | Alternating current power failure detection method, apparatus and system |
| CN112033045A (en) * | 2020-08-17 | 2020-12-04 | 珠海格力电器股份有限公司 | Control method and device of heating equipment and controller |
| CN112816913A (en) * | 2021-01-28 | 2021-05-18 | 厦门拓宝科技有限公司 | Method and device for rapidly detecting power failure of single-phase alternating voltage signal, storage medium, program product and terminal equipment |
| CN113263939A (en) * | 2021-07-19 | 2021-08-17 | 宁波均胜新能源汽车技术有限公司 | Automobile charging pile power supply method and charging pile |
| CN114295887A (en) * | 2021-12-22 | 2022-04-08 | 科德数控股份有限公司 | Power failure detection method |
| CN114295887B (en) * | 2021-12-22 | 2023-07-18 | 科德数控股份有限公司 | Power failure detection method |
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| CN105301522B (en) | 2018-07-24 |
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