CN105372479A - Voltage flicker measurement method for power quality measurement instrument - Google Patents
Voltage flicker measurement method for power quality measurement instrument Download PDFInfo
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- CN105372479A CN105372479A CN201510768208.2A CN201510768208A CN105372479A CN 105372479 A CN105372479 A CN 105372479A CN 201510768208 A CN201510768208 A CN 201510768208A CN 105372479 A CN105372479 A CN 105372479A
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Abstract
The invention relates to a voltage flicker measurement method for a power quality measurement instrument. According to acquired voltage effective value envelope data and a preset identification function, sliding convolution calculation is carried out to obtain an identification value. When positive and negative changes happen to the identification value, extreme values in a corresponding convolution calculation section and time corresponding to the extreme values are searched and acquired. According to a difference value of each two adjacent extreme values and the time corresponding to the extreme values, a flicker value in a measurement time period is calculated and obtained. The calculation method completely meets a definition that voltage of a power system is influenced by large load random switching by flicker according to a national standard, the method can be used for flicker calculation with periodic changes or random changes, and the measurement accuracy is high.
Description
Technical field
The present invention relates to electric power network technical field, particularly relate to a kind of voltage flicker measuring method of quality of power supply surveying instrument.
Background technology
Voltage fluctuation causes the human eye visual sense of lamp illuminance instability (light flash) to react to be called flickering, and in other words, flickering reflects the impact that light flash that voltage fluctuation causes produces people's visual sense.Voltage flicker is the result that voltage fluctuation causes, and is an important characterising parameter of power quality standard.
The voltage flicker measuring method of tradition electric energy quality measuring instrument carries out calculating according to the computing method of 2000 editions former GB recommendations, when signal measurement stable period, reason is blocked because of the incomplete cycle, survey calculation error is mostly more than 10%, and flickering is mostly non-stable period, the actual measurement error of calculation also wants large.Therefore, there is the low shortcoming of measurement accuracy in the voltage flicker measuring method of traditional electric energy quality measuring instrument.
Summary of the invention
Based on this, be necessary for the problems referred to above, the voltage flicker measuring method of the quality of power supply surveying instrument providing a kind of measurement accuracy higher.
A voltage flicker measuring method for quality of power supply surveying instrument, comprises the following steps:
Carry out slip convolutional calculation according to obtained voltage effective value envelop data and default identification function and obtain identifier;
When positive and negative change occurs for described identifier, search and the extreme value obtained in corresponding convolutional calculation section and time corresponding to extreme value;
Obtain the flickering value in the Measuring Time cycle according to the difference of each adjacent two extreme values and Time Calculation corresponding to extreme value and export.
The voltage flicker measuring method of above-mentioned quality of power supply surveying instrument is a kind of fuzzy recognition to curve, carries out slip convolutional calculation obtain identifier according to obtained voltage effective value envelop data and default identification function.When positive and negative change occurs identifier, search and the extreme value obtained in corresponding convolutional calculation section and time corresponding to extreme value.The flickering value in the Measuring Time cycle is obtained according to the difference of each adjacent two extreme values and Time Calculation corresponding to extreme value.Namely the method eliminates the limited resolution fluctuation because digital quantizing process produces, and meet again the testing requirement of plots changes, the flickering that can be used for cyclical variation or random variation calculates, and measurement accuracy is high.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the voltage flicker measuring method of a kind of quality of power supply surveying instrument in an embodiment;
Fig. 2 is the slip convolutional calculation schematic diagram of identification function and data and curves in an embodiment;
Fig. 3 be in an embodiment when there is positive and negative change in identifier, search and the process flow diagram of the extreme value obtained in corresponding convolutional calculation section and time corresponding to extreme value;
Fig. 4 is the process flow diagram obtaining the flickering value in the Measuring Time cycle in an embodiment according to the difference of each adjacent two extreme values and Time Calculation corresponding to extreme value.
Embodiment
A voltage flicker measuring method for quality of power supply surveying instrument, can be used for periodically variable flickering and calculates, also can be used for the calculating of randomness flickering.As shown in Figure 1, said method comprises the following steps:
Step S120: carry out slip convolutional calculation according to obtained voltage effective value envelop data and default identification function and obtain identifier.Identification function is set according to measurement data structure and Standard, carries out slip convolutional calculation with the voltage effective value envelop data obtained and obtain identifier.Identification function is specifically as follows linear and meets the identification mistiming and be greater than 30mS.In the present embodiment, identification function is: fs (j)={-2 ,-1,0,1,2}, the holding time is 40mS, meets the requirement that change in GB within 30mS is invalid.
Further, wherein in an embodiment, step S120 is specially:
Wherein, Ux [i] represents voltage effective value envelop data, and m is the quantity sum of the voltage effective value envelop data obtained in the Measuring Time cycle, and fs (j) represents identification function, and Dn represents identifier.By the 1st data of voltage effective value envelop data Ux [i], when the slope that data move towards trend is greater than zero, Dn>0; When slope is for bearing, Dn<0.Be illustrated in figure 2 the slip convolutional calculation schematic diagram of identification function and data and curves in an embodiment.
Wherein in an embodiment, before step S120, the voltage flicker measuring method of quality of power supply surveying instrument also can comprise step 110.
Step 110: process is carried out to the measurement data received and obtains voltage effective value envelop data.
Obtain the measurement data that quality of power supply surveying instrument records, according to preset standard, Measurement and Data Processing are become the voltage effective value envelop data of every 10mS 1.The data sequence of every 8.333mS 1 should be treated in 60 hertz system.Be voltage effective value envelop data by Measurement and Data Processing, be convenient to follow-uply carry out data processing.
Step S130: when positive and negative change occurs identifier, searches and the extreme value obtained in corresponding convolutional calculation section and time corresponding to extreme value.Carry out effective extreme point according to identifier to search, obtain extreme value in corresponding convolutional calculation section and time corresponding to extreme value, namely extreme value refers to maximal value or the minimum value of voltage effective value envelop data in corresponding convolutional calculation section.Wherein in an embodiment, extreme value comprises maximal value and minimum value.As shown in Figure 3, step S130 comprises step S132 and step S134.
Step S132: at identifier from when just becoming negative, obtains maximal value in corresponding convolutional calculation section and time corresponding to maximum of points.When identifier Dn is by just becoming negative, from the data corresponding to i point, find out the maximal value Bn (k) in the corresponding convolutional calculation section of identification function f s (j), and the i value recorded corresponding to maximum of points is as time value t (k), with computing time second; I=i+5, i.e. no longer valid extreme point in the section of searching simultaneously.
Step S134: become timing from negative at identifier, obtains minimum value in corresponding convolutional calculation section and time corresponding to minimum point.Similarly, when identifier Dn is by just bearing, from the data corresponding to i point, find out the minimum value in the corresponding convolutional calculation section of identification function f s (j), and the i value of record corresponding to minimum point is as time value, with computing time second.
Step S140: obtain the flickering value in the Measuring Time cycle according to the difference of each adjacent two extreme values and Time Calculation corresponding to extreme value and export.After all data are scanned, carry out the calculating of flickering value using the extreme value obtained and corresponding time as data basis, the flickering value in the Measuring Time cycle can be obtained.Exporting flickering value can be directly shown by display, also can be flickering value is sent to master controller store.Wherein in an embodiment, as shown in Figure 4, obtain the flickering value in the Measuring Time cycle in step S140 according to the difference of each adjacent two extreme values and Time Calculation corresponding to extreme value, specifically comprise step S142 and step S144.
Step S142: the flickering value produced according to the difference of adjacent two extreme values and each amplitude change of Time Calculation corresponding to extreme value.Be specially:
Wherein, point subitem is the absolute value of change difference, and denominator term is current envelope line value.Pkk represents a kth flickering value that amplitude change produces, and the change mark 1 that pk1 is 1 for the corresponding flickering changed corresponding to frequency fk=60/ (t [k+1]-t [k]) is worth, by acquisition of tabling look-up.Obtain change mark 1 by " GBT12326-2008 quality of power supply voltage fluctuation and flicker " that inquiry is as shown in table 1 in the present embodiment to be worth.Bn [k] and Bn [k+1] is respectively extreme value when identifier kth time changes for+1 time with kth, and t [k] and t [k+1] is respectively time corresponding to Bn [k] and Bn [k+1], with scale second.
| Fki frequency (secondary/min) | Pk1 mark 1 value | Fki frequency (secondary/min) | Pk1 mark 1 value |
| 0.75 | 3 | 26.6 | 1 |
| 0.84 | 2.9 | 32 | 0.95 |
| 0.95 | 2.8 | 39 | 0.9 |
| 1.01 | 2.7 | 48.7 | 0.85 |
| 1.2 | 2.6 | 61.8 | 0.8 |
| 1.36 | 2.5 | 80.5 | 0.75 |
| 1.55 | 2.4 | 110 | 0.7 |
| 1.78 | 2.3 | 175 | 0.65 |
| 2.05 | 2.2 | 275 | 0.6 |
| 2.39 | 2.1 | 380 | 0.55 |
| 2.79 | 2 | 475 | 0.5 |
| 3.29 | 1.9 | 580 | 0.45 |
| 3.92 | 1.8 | 690 | 0.4 |
| 4.71 | 1.7 | 795 | 0.35 |
| 5.72 | 1.6 | 1052 | 0.29 |
| 7.04 | 1.5 | 1180 | 0.3 |
| 8.79 | 1.4 | 1400 | 0.35 |
| 11.16 | 1.3 | 1620 | 0.4 |
| 14.44 | 1.2 | 1800 | 0.45 |
| 19.1 | 1.1 |
Table 1
Further, if the frequency fk calculated is not in table 1 corresponding point, at fk
iand fk
i+1between corresponding pk1 at pk1
ifor pk1
i+1, then linear interpolation is carried out by the pk1 value that following formulae discovery fk is corresponding.
Wherein, fk ∈ [fk
i+1, fk
i].When frequency fk is not in table 1 corresponding point, processed by linear interpolation, be convenient to carry out data calculating, improve computational accuracy.
Step S144: according to the flickering value in the flickering value computation and measurement time cycle that each amplitude change produces.Be specially:
P＝∑pkk×[t(k+1)-t(k)]/T
Wherein, P is the flickering value in the Measuring Time cycle, [t (k+1]-t (k)] the flickering Pkk of kth time change time shared within the actual measurement cycle there is probable value in/T, and T is the actual measurement cycle, calculates with second.After the mistiming of difference in magnitude and correspondence determining 2 adjacent extreme points and the frequency of correspondence thereof, the ratio in mistiming and actual measurement cycle is defined as the time probability that this flickering exists; Divided by unit flickering value corresponding to frequency, there is probability in the time of being multiplied by difference in magnitude percentage again, cumulatively within the whole Measuring Time cycle just can accurately calculate flickering value.
The voltage flicker measuring method of above-mentioned quality of power supply surveying instrument, the flickering that can be used for cyclical variation or random variation calculates, and define identical, and accuracy is high with the flickering of national regulations.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be noted that; for the person of ordinary skill of the art; without departing from the inventive concept of the premise; some distortion and improvement can also be made; such as change the slope of fs () and do corresponding extrema-finding way distortion etc. because of slope variation, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (5)
1. a voltage flicker measuring method for quality of power supply surveying instrument, is characterized in that, comprise the following steps:
Carry out slip convolutional calculation according to obtained voltage effective value envelop data and default identification function and obtain identifier;
When positive and negative change occurs for described identifier, search and the extreme value obtained in corresponding convolutional calculation section and time corresponding to extreme value;
Obtain the flickering value in the Measuring Time cycle according to the difference of each adjacent two extreme values and Time Calculation corresponding to extreme value and export.
2. the voltage flicker measuring method of a kind of quality of power supply surveying instrument according to claim 1, is characterized in that, described identification function is: fs (j)={-2 ,-1,0,1,2}.
3. the voltage flicker measuring method of a kind of quality of power supply surveying instrument according to claim 1, is characterized in that, carries out slip convolutional calculation and obtains identifier, be specially according to obtained voltage effective value envelop data and default identification function:
Wherein, Ux [i] represents voltage effective value envelop data, and the quantity sum of the voltage effective value envelop data that m obtains for the Measuring Time cycle is interior, fs (j) represents identification function, and Dn represents identifier.
4. the voltage flicker measuring method of a kind of quality of power supply surveying instrument according to claim 1, it is characterized in that, described extreme value comprises maximal value and minimum value; Described when positive and negative change occurs for described identifier, search and the step of the extreme value obtained in corresponding convolutional calculation section and time corresponding to extreme value, comprise the following steps:
At described identifier from when just becoming negative, obtain maximal value in corresponding convolutional calculation section and time corresponding to maximum of points;
Become timing at described identifier from negative, obtain minimum value in corresponding convolutional calculation section and time corresponding to minimum point.
5. the voltage flicker measuring method of a kind of quality of power supply surveying instrument according to claim 1, it is characterized in that, the described difference according to each adjacent two extreme values and Time Calculation corresponding to extreme value obtain the step of the flickering value in the Measuring Time cycle, comprise the following steps:
According to the flickering value that the difference of adjacent two extreme values and each amplitude change of Time Calculation corresponding to extreme value produce, be specially:
Wherein, Pkk represents a kth flickering value that amplitude change produces, the change mark 1 that pk1 is 1 for the corresponding flickering changed corresponding to frequency fk=60/ (t [k+1]-t [k]) is worth, Bn [k] and Bn [k+1] is respectively extreme value when identifier kth time changes for+1 time with kth, t [k] and t [k+1] is respectively time corresponding to Bn [k] and Bn [k+1], with scale second;
According to the flickering value in the flickering value computation and measurement time cycle that described each amplitude change produces, be specially:
P＝∑pkk×[t(k+1)-t(k)]/T
Wherein, P is the flickering value in the Measuring Time cycle, [t (k+1]-t (k)] the flickering value Pkk of kth time amplitude change time shared within the actual measurement cycle there is probable value in/T, and T is the actual measurement cycle, calculates with second.
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| CN113625074A (en) * | 2021-07-02 | 2021-11-09 | 深圳供电局有限公司 | Method and device for judging standard exceeding of long-time flicker caused by transient power quality disturbance |
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Effective date of registration: 20191115 Address after: 514000 Bingfang Avenue 48 electric power complex in Meizhou, Guangdong Patentee after: Meizhou power supply administration of Guangdong Power Grid Co., Ltd Address before: 514000 power building, No. 48, Fang Fang Road, Meijiang District, Meizhou, Guangdong Co-patentee before: WUHAN WUGAO ELECTRICAL TECHNOLOGY CO., LTD. Patentee before: Meizhou power supply administration of Guangdong Power Grid Co., Ltd |
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