CN103197129A - Electric power signal zero crossing point detection method - Google Patents
Electric power signal zero crossing point detection method Download PDFInfo
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- CN103197129A CN103197129A CN2013101224645A CN201310122464A CN103197129A CN 103197129 A CN103197129 A CN 103197129A CN 2013101224645 A CN2013101224645 A CN 2013101224645A CN 201310122464 A CN201310122464 A CN 201310122464A CN 103197129 A CN103197129 A CN 103197129A
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Abstract
The invention belongs to the technical field of electric power signal analysis in electric power systems, and particularly relates to a zero point judging method based on electric power system sampling signals. An electric power signal zero crossing point detection method is mainly characterized by being capable of correcting errors of zero point judgment by high frequency harmonic interference, optimally selecting real zero crossing points, removing jump points and restraining errors caused by voltage and current events. Through a series of scientific and accurate methods, zero crossing points of electric power sinusoidal signals can be selected step by step.
Description
Technical field
The invention belongs to electric system electric power signal analysis technical field, be specifically related to a kind of method of judging based on the zero point of electric system sampled signal, in the electric power signal analysis, play an important role, be applied to frequency power signal analysis etc.
Background technology
The electric power signal data collecting card is converted to discrete data with continuous signal, and in theory, periodic signal stable and that be not interfered is if each cycle, just collect more than 10 points can analytic signal and recover measured signal fully.But in fact because the complicacy signal of electric system is not desirable.10 points of data sampling are not enough to analytic signal or deeper analysis.So data sampling point often all is more than 10 points (sampling numbers 128,256 at present).Instability and sampling number just because of electric power signal increase, near zero point, may occur because a plurality of zero crossings of higher hamonic wave influence, under the situation that zero crossing is out of one's reckoning, also be to have mistake to follow-up electric power analysis so, especially can have bigger error calculated rate the time.By accepting judging of pulse at zero point following some deficiency is arranged with respect to hardware zero point: 1, hardware implementation cost wants height, circuit to have interference problem.2, hardware still can not solve the pulse at zero point that the pseudozero point problem still receives pseudozero point, and software or hardware that this will be follow-up are handled.3, can not accurate Calculation the sampling number (or relative time) at zero point, there is error in analysis to electric power.
Summary of the invention
Owing to influenced by higher hamonic wave, there are a plurality of zero crossings in electric power signal in order to solve in the prior art, in the collection of electric power signal, Treatment Analysis true zero crossing is judged and inaccurately causes the electric power signal computational analysis to have technical matters than mistake easily.The application discloses a kind of electric power signal zero crossing detection method, and the present invention can select the real zero crossing pseudozero point that higher hamonic wave disturbs electric power signal to produce of forgoing according to repeatedly judging near zero point.The present invention can also be correct calculate sampling number or mistiming between 2.
The present invention specifically by the following technical solutions.
A kind of electric power signal zero crossing detection method is characterized in that, said method comprising the steps of:
(1) gathers the electric power signal data with fixing sample frequency, obtain electric power signal at the data value Sample[1 of each sampled point], Sample[2] ... Sample[N],, wherein N is weekly the sampling number of phase, Sample[i] and be that the electric power signal data of gathering are at the data value of i sampled point;
(2) in all electric power signal data sampling point data values, meet the following conditions, judge that then this sampling number is according to being the possible zero crossing of electric power signal:
If Sample[i] satisfy Sample[i]＜0, and Sample[i+1]〉0 and Sample[i+M1] 0 or Sample[i] 0, and Sample[i+1]＜0 and Sample[i+M1]＜0, then judge Sample[i] be a possible zero crossing, wherein, i=0,1,2 ... N-M1, M1 are presetting first threshold M1=N/10; Judge all possible zero crossing, and deposit among the array ZeroPosition position i at all zero points in ZeroPosition[i] be the element in the described array, be the position of all possible zero crossing, wherein, i=0,1,2 ... K1, K1 are all possible zero crossing number;
(3) in the possible zero crossing ZeroPosition of the resulting electric power signal of step (2), remove jump, be pseudozero point according to following method of discrimination, eliminate higher hamonic wave to the interference of electric power signal zero crossing, array ZeroPosition is passed to array Buff
If satisfy Buff[i+n]-Buff[i]＜M2, i=0 wherein, 1,2 ... K1-n, M2 is the second default threshold value, the space-number of n for setting, first threshold M2 is not more than N/20, the space-number n value of setting is the integer between 3-10, judges that then Buff [i+n-1] is zero crossing if satisfy, and removes this zero crossing all zero crossings before, draw all zero crossings successively according to this judgment mode, and write array ZeroPosition again, at this moment, the element in this array is respectively i=0,1,2 ... K2, the zero crossing number that K2 judges for this step, K2＜=K1;
(4) in the resulting zero crossing ZeroPosition of step (3), the zero crossing that may exist reasons such as voltage, current interruptions to produce is removed these voltages, current interruptions zero point according to following formula: array ZeroPosition is passed to array Buff
If satisfy following formula:
Buff[i+1]-Buff[i] N1 and Buff[i+1]-Buff[i]＜N2,
Wherein, i=0,1,2 ... K2-1, N1 are the 3rd threshold value, and N2 is the 4th threshold value, and N1+N2 ≈ N and (N2-N1)＜N/3, then judges Buff[i+1] be voltage, current interruptions zero point, remove this ZeroPosition[i+1] zero crossing.
Electric power signal zero crossing detection method disclosed by the invention is very important for the accurate Calculation frequency, and can obtain a plurality of correct periodic signals in the electric power signal analysis also is good a kind of method, rather than simply calculates according to sample frequency.
Description of drawings
Fig. 1 is the application's electric power signal zero crossing detection method schematic flow sheet;
Fig. 2 is for judging the flow process of all zero crossings that satisfy condition in the application's method;
Fig. 3 judges the flow process of removing pseudozero point in the application's method;
Fig. 4 is the flow process of judging the zero point of removing voltage, the generation of electric current event in the application's method.
Embodiment
Below in conjunction with Figure of description, the application's technical scheme is described in further details.
Be the disclosed electric power signal zero crossing of the application detection method as shown in Figure 1, concrete steps are as follows:
(1) gathers the electric power signal data with fixing sample frequency, obtain electric power signal at the data value Sample[1 of each sampled point], Sample[2] ... Sample[N], wherein N is weekly the sampling number of phase, common sampling number is 128,256 or 512 etc., and the N value has much relations with afterwards threshold values value.
(2) in all electric power signal data sampling point data values, meet the following conditions, then judge this sampling number according to being the possible zero crossing of electric power signal, this process as shown in Figure 2:
Extract image data Sample[], 512 point, the i.e. N=512 if the frequency acquisition 25.6KHZ(monocycle samples).The i initialize is 0, judge span i＜N-M1 of i, if Sample[i] satisfy condition: Sample[i]＜0, and Sample[i+1]〉0 and Sample[i+M1] 0 or Sample[i] 0, and Sample[i+1]＜0 and Sample[i+M1]＜the 0(M1 threshold values is Sample[i] first zero in zone of living in counts at interval with last zero point, can guarantee that so true zero crossing is not leaked choosing, according to can value to the requirement of power grid quality be M1=N/10), then judge Sample[i] be a possible zero crossing, i=i+1 continues cycle criterion until not satisfying span then.The position of the possible zero crossing of the conditions that all are satisfied writes ZeroPosition.
(3) at the possible zero crossing ZeroPosition of the resulting electric power signal of step (2), remove jump, be pseudozero point according to following method of discrimination, eliminate higher hamonic wave to the interference of electric power signal zero crossing: the possible zero crossing that step (2) is satisfied condition writes array Buff, the i initialize is 0, judges span i＜K1-n of i.Judge Buff[i+n]-Buff[i]＜M2(n=4, every n zero crossing is judged as one group, the M2 threshold values is Buff[i] first zero in zone of living in count at interval last zero point 1/2, according to can value M2=N/20, K1 to the requirement of power grid quality be the zero number of Buff).
If condition satisfies then Buff[i+n-1] for zero crossing writes ZeroPosition, remove other points.Then i=i+n+1 substitution following formula continue is judged, well get rid of pseudozero point by this step, and approached relatively also the zero point of screening true.
If condition does not satisfy n=n-1; The substitution following formula continues to judge.
Do not satisfy span until i, method is screened away the zero point that satisfies condition as shown in Figure 3.
(4) in the resulting zero crossing of step (3), the zero crossing that may exist reasons such as voltage, current interruptions to produce is removed these voltages, current interruptions zero point according to following formula, its flow process as shown in Figure 4:
Write array Buff the zero point that step (3) is satisfied condition, i initialize i=0, span i＜K2-1 of judgement i.If satisfy condition: Buff[i+1]-Buff[i] N1 and Buff[i+1]-Buff[i]＜N2 (is separated by between 2 of the true zero crossings and is about N, interrupt the zero crossing that produces suddenly at crest or trough but may comprise electric current and voltage in the zero crossing of this moment.Threshold values N1, N2 relation: N1+N2 ≈ N, and (N2-N1)＜N/3, K2 are the zero number of Buff), Buff[i then] be zero crossing, i=i+1 continuation cycle criterion is until not satisfying span then.Again write ZeroPosition.What at this moment deposit among the ZeroPosition is comparatively real zero crossing position.
The present patent application people has done detailed explanation and description in conjunction with Figure of description to embodiments of the invention; but those skilled in the art should understand that; above embodiment only is the preferred embodiments of the invention; detailed explanation is just in order to help the reader to understand spirit of the present invention better; and be not limiting the scope of the invention; on the contrary, any any improvement or modification of doing based on invention spirit of the present invention all should drop within protection scope of the present invention.
Claims (1)
1. an electric power signal zero crossing detection method is characterized in that, said method comprising the steps of:
(1) gathers the electric power signal data with fixing sample frequency, obtain electric power signal at the data value Sample[1 of each sampled point], Sample[2] ... Sample[i] ... Sample[N], wherein N is weekly the sampling number of phase, Sample[i] be that the electric power signal data of gathering are at the data value of i sampled point;
(2) in all electric power signal data sampling point data values, meet the following conditions, judge that then this sampling number is according to being the possible zero crossing of electric power signal:
If Sample[i] satisfy Sample[i]＜0, and Sample[i+1]〉0 and Sample[i+M1] 0 or Sample[i] 0, and Sample[i+1]＜0 and Sample[i+M1]＜0, then judge Sample[i] be a possible zero crossing, wherein, i=0,1,2 ... N-M1, M1 are presetting first threshold, M1=N/10; Judge all possible zero crossing, and deposit among the array ZeroPosition position i at all zero points in ZeroPosition[i] be the element in the described array, be the position of all possible zero crossing, wherein, i=0,1,2 ... K1, K1 are all possible zero crossing number;
(3) the possible zero crossing ZeroPosition of the resulting electric power signal of step (2) is composed to array Buff, removes jump, is pseudozero point according to following method of discrimination, eliminate higher hamonic wave to the interference of electric power signal zero crossing:
If satisfy Buff[i+n]-Buff[i]＜M2, i=0 wherein, 1,2 ... K1-n, M2 is the second default threshold value, the space-number of n for setting, first threshold M2 is not more than N/20, and the space-number n value of setting is the integer between 3-10,
Judge that then Buff [i+n-1] is zero crossing, remove this zero crossing all possible zero crossing before, draw all zero crossings successively according to this judgment mode, and write array ZeroPosition again, at this moment, the element in this array is respectively i=0,1,2 ... K2, the zero crossing number that K2 judges for this step, K2＜=K1.
(4) in the resulting zero crossing of step (3), the zero crossing that may exist reasons such as voltage, current interruptions to produce is removed these voltages, current interruptions zero point according to following formula, and array ZeroPosition is composed to array Buff.
If satisfy following formula:
Buff[i+1]-Buff[i] N1 and Buff[i+1]-Buff[i]＜N2,
I=0 wherein, 1,2 ... K2-1, N1 are the 3rd threshold value, and N2 is the 4th threshold value, N1+N2=N, and (N2-N1)＜N/3,
Then judge Buff[i+1] be voltage, current interruptions zero point, remove this Buff[i+1] zero crossing.
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| CN104597314A (en) * | 2013-10-31 | 2015-05-06 | 博西华电器（江苏）有限公司 | Anti-interference method and device for zero-crossing point detection of household appliance and household appliance |
| CN104655905A (en) * | 2013-11-25 | 2015-05-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Relevant sinusoidal signal detection method and device |
| CN105259409A (en) * | 2015-10-13 | 2016-01-20 | 安徽节源环保科技有限公司 | Power signal frequency calculating method based on zero-crossing time-domain characteristic |
| CN105277780A (en) * | 2014-06-25 | 2016-01-27 | 国家电网公司 | Voltage zero-crossing point obtaining method and device |
| CN106487477A (en) * | 2015-11-30 | 2017-03-08 | 无锡华润矽科微电子有限公司 | Receiving end signal processing method based on zero passage detection |
| CN107634520A (en) * | 2017-10-18 | 2018-01-26 | 深圳市赛源电气技术有限公司 | Zero cross detection circuit and capacitor compensation cabinet |
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| CN110850151A (en) * | 2019-11-04 | 2020-02-28 | 易事特集团股份有限公司 | Zero-crossing determination method and zero-crossing determination device |
| CN112129993A (en) * | 2019-06-24 | 2020-12-25 | 天地融科技股份有限公司 | Zero crossing point signal output and power line data sending method and equipment |
| CN112362952A (en) * | 2020-10-21 | 2021-02-12 | 华帝股份有限公司 | Anti-interference power grid voltage zero crossing point judgment method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0112948A1 (en) * | 1982-12-30 | 1984-07-11 | Sharp Kabushiki Kaisha | Power frequency detection system |
| CN1727906A (en) * | 2005-07-28 | 2006-02-01 | 泰州苏源集团科电有限公司 | Cycle sampling method in quality of power supply in electrical network |
| CN1766659A (en) * | 2005-10-25 | 2006-05-03 | 珠海泰坦科技股份有限公司 | Zero automatic detection method of positive and negative busbar insulating detection sensor |
| CN1815248A (en) * | 2005-02-02 | 2006-08-09 | 艾默生网络能源系统有限公司 | Alternating Current Frequency Monitoring Method |
| JP2009041918A (en) * | 2007-08-06 | 2009-02-26 | Toto Ltd | Electronic instrument and toilet apparatus |
| CN101806832A (en) * | 2010-04-15 | 2010-08-18 | 南京邮电大学 | Measuring method for frequencies of low-frequency signals |
| CN202033403U (en) * | 2011-04-08 | 2011-11-09 | 苏州路之遥科技股份有限公司 | Alternating current value and current zero crossing point detection circuit |
| CN102478599A (en) * | 2010-11-22 | 2012-05-30 | 浙江昱能光伏科技集成有限公司 | Power grid alternating voltage, and method and device for detecting zero crossing point of power grid alternating voltage |
-
2013
- 2013-04-10 CN CN201310122464.5A patent/CN103197129B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0112948A1 (en) * | 1982-12-30 | 1984-07-11 | Sharp Kabushiki Kaisha | Power frequency detection system |
| CN1815248A (en) * | 2005-02-02 | 2006-08-09 | 艾默生网络能源系统有限公司 | Alternating Current Frequency Monitoring Method |
| CN1727906A (en) * | 2005-07-28 | 2006-02-01 | 泰州苏源集团科电有限公司 | Cycle sampling method in quality of power supply in electrical network |
| CN1766659A (en) * | 2005-10-25 | 2006-05-03 | 珠海泰坦科技股份有限公司 | Zero automatic detection method of positive and negative busbar insulating detection sensor |
| JP2009041918A (en) * | 2007-08-06 | 2009-02-26 | Toto Ltd | Electronic instrument and toilet apparatus |
| CN101806832A (en) * | 2010-04-15 | 2010-08-18 | 南京邮电大学 | Measuring method for frequencies of low-frequency signals |
| CN102478599A (en) * | 2010-11-22 | 2012-05-30 | 浙江昱能光伏科技集成有限公司 | Power grid alternating voltage, and method and device for detecting zero crossing point of power grid alternating voltage |
| CN202033403U (en) * | 2011-04-08 | 2011-11-09 | 苏州路之遥科技股份有限公司 | Alternating current value and current zero crossing point detection circuit |
Cited By (22)
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| CN104597314A (en) * | 2013-10-31 | 2015-05-06 | 博西华电器（江苏）有限公司 | Anti-interference method and device for zero-crossing point detection of household appliance and household appliance |
| CN104655905B (en) * | 2013-11-25 | 2017-11-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Related sinusoidal detection method and device |
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| CN105277780A (en) * | 2014-06-25 | 2016-01-27 | 国家电网公司 | Voltage zero-crossing point obtaining method and device |
| CN105259409B (en) * | 2015-10-13 | 2017-11-28 | 安徽节源环保科技有限公司 | A kind of frequency power signal computational methods based on zero passage time domain specification |
| CN105259409A (en) * | 2015-10-13 | 2016-01-20 | 安徽节源环保科技有限公司 | Power signal frequency calculating method based on zero-crossing time-domain characteristic |
| CN106487477A (en) * | 2015-11-30 | 2017-03-08 | 无锡华润矽科微电子有限公司 | Receiving end signal processing method based on zero passage detection |
| CN106487477B (en) * | 2015-11-30 | 2017-12-01 | 无锡华润矽科微电子有限公司 | Receiving end signal processing method based on zero passage detection |
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| CN110221202A (en) * | 2019-07-17 | 2019-09-10 | 西安西电开关电气有限公司 | A kind of current curve treating method and apparatus of the operating current of breaker |
| CN110609172A (en) * | 2019-08-15 | 2019-12-24 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | System and method for measuring carrier frequency of pulse modulation signal |
| CN110850151A (en) * | 2019-11-04 | 2020-02-28 | 易事特集团股份有限公司 | Zero-crossing determination method and zero-crossing determination device |
| CN110850151B (en) * | 2019-11-04 | 2022-04-12 | 易事特集团股份有限公司 | Zero-crossing determination method and zero-crossing determination device |
| CN112362952A (en) * | 2020-10-21 | 2021-02-12 | 华帝股份有限公司 | Anti-interference power grid voltage zero crossing point judgment method |
| CN113049872A (en) * | 2021-02-02 | 2021-06-29 | 厦门大学 | Electric signal zero detection method for multiple times of low-frequency current ripple suppression |
| CN113049872B (en) * | 2021-02-02 | 2021-11-16 | 厦门大学 | Electric signal zero detection method for multiple times of low-frequency current ripple suppression |
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