CN101534008B - Method for reducing influence of voltage sag on electric equipment - Google Patents
Method for reducing influence of voltage sag on electric equipment Download PDFInfo
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- CN101534008B CN101534008B CN2008102194951A CN200810219495A CN101534008B CN 101534008 B CN101534008 B CN 101534008B CN 2008102194951 A CN2008102194951 A CN 2008102194951A CN 200810219495 A CN200810219495 A CN 200810219495A CN 101534008 B CN101534008 B CN 101534008B
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Abstract
The invention provides a method for reducing influence of voltage sag on electric equipment, which comprises the following steps: by analyzing the amplitude and duration of the voltage sag born by sensitive equipment, counting the amplitude and the duration of each voltage sag event occurring in incoming power supply lines; acquiring an empirical distribution function through statistics, and adopting least square fitting to acquire probability distribution of the amplitude and the duration of the voltage sag respectively; and calculating values according to indexes, and distributing the sensitive equipment with different types to different power supply points. The method distributes the most sensitive equipment to the power supply incoming line with minimum occurrence of voltage sag events so as to reduce the influence of the voltage sag events on power consumers.
Description
Technical field
The present invention designs power supply electric power network technique field, relates in particular to the technical field to the distribution of power consumer power consumption equipment on electric power incoming line.
Background technology
For the load/equipment in the power supply network,, claim that this type load is sensitive load/equipment if voltage change or variation suddenly will cause its cisco unity malfunction or function reduction.Voltage dip (VoltageSag) problem is meant the incident that the supply power voltage effective value descended suddenly in the short time, and its time that continues is generally cycle to 30 cycle half.Though the duration of incident is of short duration, can cause faults such as equipment downtime tripping operation, bring enormous economic loss to power consumer.But different sensitive loads is subjected to voltage dip events affecting difference, and voltage dip amplitude and the duration that can bear all have any different.Normal at present CEBMA curve and the ITIC curve of adopting weighed the defensive ability/resistance ability of equipment to the voltage dip incident.Article two, corresponding voltage dip amplitude and duration have been marked in the curve.For power consumer, can only customize sensitive equipment according to curve, but can't specifically distribute sensitive users according to the electric power thus supplied of power supply.
Summary of the invention
The objective of the invention is to overcome the prior art above shortcomings, a kind of method that reduces voltage dip to the power consumption equipment influence is provided.Reasonably distribute sensitive load (equipment) for the ease of power consumer, dissimilar sensitive loads is assigned on the different power supply points, equipment stoppage in transit probability level has been proposed, calculate temporary range of decrease value of voltage and the probability of duration on the electric power incoming line, size according to index, the most responsive sharing of load is taken place on the minimum electric power incoming line to the voltage dip incident, to reduce of the influence of voltage dip incident power consumer.
The present invention is achieved through the following technical solutions: reduce the method for voltage dip to the equipment influence, it comprises the steps:
(1) analyzes the amplitude U of the voltage dip that sensitive equipment can bear
0With duration t
0, when amplitude less than U
0, and the duration is greater than t
0The time, sensitive equipment can be stopped transport;
(2) statistics is respectively wired back the amplitude and the duration of source inlet wire generation voltage dip incident, sets between each incident separately, belongs to the repetition independent event, meets the Bei Nuli probabilistic model; Obtain empirical distribution function by statistics, adopt least square fitting, obtain the probability distribution of voltage dip amplitude and duration respectively;
(3) the amplitude U of the voltage dip that can bear according to power consumption equipment
0With duration t
0, calculate equipment stoppage in transit probability level in every electric power incoming line;
(4) according to the size of the described probability level of step (3), with important sensitive equipment, non-important sensitive equipment and non-sensitive equipment according to described stoppage in transit probability order assignment from small to large to corresponding electric power incoming line, under the constraints that satisfies the electric power incoming line capacity requirement, the probability minimum that all devices is stopped transport, reducing voltage dip influences equipment.Important sensitive equipment can be assigned on the electric power incoming line of equipment stoppage in transit probability minimum, more non-important sensitive equipment be assigned on the electric power incoming line that takes second place, and with non-sensitive devices allocation to other electric power incoming lines.
In the method for above-mentioned minimizing voltage dip to the equipment influence, described probability level is:
P(U
0，t
0)＝P(U<U
0)P(t>t
0)，
P (U wherein
0, t
0) be equipment stoppage in transit probability, P (U＜U
0) be that voltage dip incident amplitude is less than U
0Probability, P (t〉t
0) be that the voltage dip incident duration is greater than t
0Probability; Voltage dip amplitude and the duration that can bear when certain sensitive equipment are respectively U
0And t
0, then equipment stoppage in transit probability level is P (U
0, t
0).
The present invention compared with prior art has following advantage and remarkable result: cause user power utilization equipment stoppage in transit probability effectively to be assessed to the voltage dip incident, and this assessment technology is used for guides user distribution sensitive load.Equipment stoppage in transit probability level can clear indication different electrical power inlet wire on temporary range of decrease value of voltage and the probability distribution situation of duration, therefore can be according to the sensitivity and the significance level of equipment, be assigned on the different electric power incoming lines, satisfying under the capacity requirement condition of electric power incoming line, make sensitive load be subjected to the minimum that influences of voltage dip incident, can be with the index that quantizes, the sensitive load of guides user reasonable distribution enterprises.
Description of drawings
Fig. 1 is the implementing procedure schematic diagram in the specific embodiment of the invention.
Fig. 2 is the probability distribution curve of the voltage dip amplitude of 5 nodes in the execution mode.
Fig. 3 is the probability distribution curve of the voltage dip duration of 5 nodes in the execution mode.
Embodiment
Below in conjunction with accompanying drawing and concrete data embodiments of the present invention are described further.
Idiographic flow is at first analyzed the amplitude U of the voltage dip that sensitive load can bear as shown in Figure 1
0With duration t
0, when amplitude less than U
0, and the duration is greater than t
0The time, sensitive load can stop transport (tripping operation or shut down).Statistics is respectively wired back the amplitude and the duration of source inlet wire generation voltage dip incident, supposes between each incident separately, belongs to the repetition independent event, meets the Bei Nuli probabilistic model.Obtain empirical distribution function by statistics, adopt least square fitting, obtain the probability distribution of voltage dip amplitude and duration respectively.
According to the index calculated value, sensitive load is distributed.Further specify below in conjunction with object lesson:
Suppose that certain user has the inlet wire of 5 10kV, repeatedly voltage dip incident took place respectively in 3 years, as shown in table 1:
Table 1
Add up the amplitude probability of generation voltage dip incident of different circuit inlet wires and duration probability respectively respectively shown in Fig. 2 and 3.
The equipment stoppage in transit probability level that calculates 5 electric power incoming lines respectively is as shown in the table: table 2～6 are respectively the inlet wire of 5 10kV, and (1#～5#) goes up the result of calculation of equipment stoppage in transit probability.
Table 2
Table 3
Table 4
Table 5
Table 6
According to the voltage dip amplitude and the duration of different sensitive load correspondences, can obtain the stoppage in transit index of different sensitive equipments on different circuits, the stoppage in transit probability of each equipment is as shown in table 7.
Table 7
By the comparison of stoppage in transit probability level, can know according to different significance levels which bar electric power incoming line different sensitive loads should be arranged on.As the contactor able to programme on the production line is of paramount importance sensitive load, and then it should be arranged in the 3# inlet wire, because equipment stoppage in transit this moment probability minimum is 0.0907.After 3# inlet wire load is arranged to expire, consider again the size order of other sensitive loads according to the stoppage in transit probability is arranged in other inlet wires.
Claims (1)
1. reduce the method for voltage dip, it is characterized in that comprising the steps: the power consumption equipment influence
(1) analyzes the amplitude U of the voltage dip that sensitive equipment can bear
0With duration t
0, when amplitude less than U
0, and the duration is greater than t
0The time, sensitive equipment can be stopped transport;
(2) statistics is respectively wired back the amplitude and the duration of source inlet wire generation voltage dip incident, sets between each incident separately, meets the Bei Nuli probabilistic model; Obtain empirical distribution function by statistics, adopt least square fitting, obtain the probability distribution of voltage dip amplitude and duration respectively;
(3) the amplitude U of the voltage dip that can bear according to power consumption equipment
0With duration t
0, calculating equipment stoppage in transit probability level in every electric power incoming line, described probability level is: P (U
0, t
0)=P (U＜U
0) P (t＞t
0),
P (U wherein
0, t
0) be equipment stoppage in transit probability, P (U＜U
0) be that voltage dip incident amplitude is less than U
0Probability, P (t＞t
0) be that the voltage dip incident duration is greater than t
0Probability; Voltage dip amplitude and the duration that can bear when certain sensitive equipment are respectively U
0And t
0, then equipment stoppage in transit probability level is P (U
0, t
0);
(4) according to the size of the described probability level of step (3), with important sensitive equipment, non-important sensitive equipment and non-sensitive equipment according to described stoppage in transit probability order assignment from small to large to corresponding electric power incoming line, under the constraints that satisfies the electric power incoming line capacity requirement, the probability minimum that all devices is stopped transport, important sensitive equipment is assigned on the electric power incoming line of equipment stoppage in transit probability minimum, reducing voltage dip influences equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102194951A CN101534008B (en) | 2008-12-01 | 2008-12-01 | Method for reducing influence of voltage sag on electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102194951A CN101534008B (en) | 2008-12-01 | 2008-12-01 | Method for reducing influence of voltage sag on electric equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101534008A CN101534008A (en) | 2009-09-16 |
| CN101534008B true CN101534008B (en) | 2011-03-16 |
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ID=41104457
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|---|---|---|---|
| CN2008102194951A Expired - Fee Related CN101534008B (en) | 2008-12-01 | 2008-12-01 | Method for reducing influence of voltage sag on electric equipment |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102479284A (en) * | 2010-11-23 | 2012-05-30 | 上海市电力公司 | Calculation method of single sag characteristic quantity for power quality |
| CN102901895B (en) * | 2012-09-29 | 2015-02-18 | 上海市电力公司 | Method for evaluating voltage dip sensitivity of sensitive equipment |
| CN104749453B (en) * | 2013-12-30 | 2019-02-15 | 上海宝钢工业技术服务有限公司 | Reduce the method that outer net singlephase earth fault influences user's voltage dip |
| CN105184419A (en) * | 2015-09-25 | 2015-12-23 | 清华大学 | Distribution network voltage sag and short interruption treatment scheme optimization method |
| CN112152224B (en) * | 2020-11-24 | 2021-02-09 | 国网四川省电力公司电力科学研究院 | Voltage sag treatment optimization method and system |
| CN112686549A (en) * | 2020-12-31 | 2021-04-20 | 华南理工大学 | Node voltage sag severity evaluation method, device, equipment and storage medium |
| CN113688516A (en) * | 2021-08-19 | 2021-11-23 | 云南电网有限责任公司电力科学研究院 | Voltage regulator state evaluation method based on least square regression |
| CN113779112A (en) * | 2021-09-27 | 2021-12-10 | 南京乐帆电气科技有限公司 | Electric energy quality analysis system based on spatial information and big data mapping algorithm |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5886429A (en) * | 1997-12-11 | 1999-03-23 | Board Of Regents, The University Of Texas System | Voltage sag/swell testing station |
| CN101241157A (en) * | 2008-02-28 | 2008-08-13 | 江苏省电力试验研究院有限公司 | Voltage temporary drop simulation test procedure and method |
-
2008
- 2008-12-01 CN CN2008102194951A patent/CN101534008B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5886429A (en) * | 1997-12-11 | 1999-03-23 | Board Of Regents, The University Of Texas System | Voltage sag/swell testing station |
| CN101241157A (en) * | 2008-02-28 | 2008-08-13 | 江苏省电力试验研究院有限公司 | Voltage temporary drop simulation test procedure and method |
Non-Patent Citations (2)
| Title |
|---|
| 张鹏等.电压骤降的可靠性评估新方法.《电力系统自动化》.2002,(第08期),第20页至第24页. * |
| 杨京燕等.计及电压暂降的配网可靠性评估.《中国电机工程学报》.2005,第25卷(第18期),第28页至第33页. * |
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| CN101534008A (en) | 2009-09-16 |
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