CN103683279B - A kind of shunt capacitors on a distribution feeder collocation method being applied to online closed loop power flow Optimization analyses - Google Patents
A kind of shunt capacitors on a distribution feeder collocation method being applied to online closed loop power flow Optimization analyses Download PDFInfo
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- CN103683279B CN103683279B CN201310537867.6A CN201310537867A CN103683279B CN 103683279 B CN103683279 B CN 103683279B CN 201310537867 A CN201310537867 A CN 201310537867A CN 103683279 B CN103683279 B CN 103683279B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 title claims abstract description 14
- 238000004458 analytical method Methods 0.000 title claims abstract description 13
- 238000005457 optimization Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000000205 computational method Methods 0.000 claims description 4
- 238000007363 ring formation reaction Methods 0.000 description 4
- 208000033999 Device damage Diseases 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a kind of shunt capacitors on a distribution feeder collocation method being applied to online closed loop power flow Optimization analyses, first on calculating feeder line, each may install the non-work economic equivalent of the point of compensation condenser; Secondly, optimal compensation point is searched; Finally on the optimal compensation point of non-work economic equivalent, compensate optimal compensation capacity.The present invention adopts two point of three Curve Approximation Method to calculate optimum compensation condenser value, realizes the allocation optimum of shunt capacitors on a distribution feeder, thus ensures the accuracy of online closed loop power flow Optimization analyses result.
Description
Technical field
The present invention relates to a kind of shunt capacitors on a distribution feeder collocation method being applied to online closed loop power flow Optimization analyses.
Background technology
For simplifying power system operating mode, suppressing short circuit current level, improving the power supply reliability of electrical network, maintain the safety and economic operation of electrical network, China 110kV and following supply and distribution net generally adopt the pattern of looped network design, open loop operation.When needs transfer load or overhaul complete plan restore electricity time, general adopt first cyclization after the operator scheme of unlinking have a power failure to avoid user, improve the power supply reliability of user.
Due to larger closed loop power flow may be produced during Loop Closing Operation, cause apparatus overload or relaying protection action, cause Loop Closing Operation failure or have a power failure.If relay fail, device damage or upper level protection act may be caused, expand power failure range.Due to electrical network after cyclization operation conditions to scheduling operations staff be opaque; management and running personnel are difficult to the reliability prejudging Loop Closing Operation by rule of thumb; apparatus overload or trip protection after cyclization is probably caused because closed loop power flow is excessive; finally cause Loop Closing Operation failure, cause user to have a power failure or electric equipment damage etc.Because closed loop power flow size is difficult to direct prediction, in order to prevent device damage, be adopt break-before-make principle to operate sometimes, cause user to have a power failure in short-term, this sacrifices mains supply reliability, is unacceptable in the important load power supply areas such as urban district.Therefore, before carrying out Loop Closing Operation, should carry out closed loop power flow budget, the situation after involutive ring accomplishes to know what's what, and ensures Loop Closing Operation success, improves power supply reliability.In situation with good conditionsi, by the in-service monitoring of involutive ring trend, the time dependent situation of closed loop power flow size should be followed the tracks of, select to carry out the operation of cyclization solution in the moment that closed loop power flow is less, improve the success rate of Loop Closing Operation.
Carrying out in online closed loop power flow Optimization analyses process, shunt capacitors on a distribution feeder configuration has a great impact the accuracy tool of online closed loop power flow Optimization analyses result.
Summary of the invention
Technical problem to be solved by this invention is just to provide a kind of shunt capacitors on a distribution feeder collocation method being applied to online closed loop power flow Optimization analyses, ensures the accuracy of online closed loop power flow Optimization analyses result.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of shunt capacitors on a distribution feeder collocation method being applied to online closed loop power flow Optimization analyses, and first on calculating feeder line, each may install the non-work economic equivalent of the point of compensation condenser; Secondly, optimal compensation point is searched; Finally on the optimal compensation point of non-work economic equivalent, compensate optimal compensation capacity.
Preferably, the computational methods of described non-work economic equivalent comprise the steps:
1) virtual capacitor is added;
2) calculate add network loss after capacitor slippage, the lifting of minimum voltage point voltage, the lifting of power factor;
3) virtual capacitor is deleted;
4) step 1)-3 is repeated).
Preferably, the method for searching optimal compensation point relies on three-phase power flow.
Preferably, after finding current optimal compensation point, utilize the curved line relation of compensation capacity and loss, adopt two point of three Curve Approximation Method to calculate optimal compensation capacity.
Preferably, the computational methods of described two point of three Curve Approximation Method are: test by current test value, current experiment value is in that region of curve, then the feeder loss under test value is calculated, reduce the span of compensation experiment value by the new value obtained, carry out new round calculating with the mid point of new interval as new test value.
The present invention adopts two point of three Curve Approximation Method to calculate optimum compensation condenser value, realizes the allocation optimum of shunt capacitors on a distribution feeder, thus ensures the accuracy of online closed loop power flow Optimization analyses result.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 is " conic section " between compensation capacity and feeder loss;
Fig. 2 is two point of three Curve Approximation Method flow chart.
Embodiment
In fact capacitor arrangements is exactly first calculate on feeder line that each may be installed " non-work economic equivalent " of the point of compensation condenser, namely fall with identical compensation capacity and damage maximum points, after finding optimum " non-work economic equivalent " point, compensate most suitable capacity at that point, fall and damage maximum and under grid equipment overload or over-voltage condition can not be caused optimal compensation capacity.
Non-work economic equivalent---its physical significance often installs the compensation condenser of 1kVar, and network active loss reduces how many kilowatts.
After the optimal compensation capacity finding first compensation point, restart the calculating of searching next compensation point, until reach the required precision of setting or all calculate complete.
Calculate in the method for all calculative interpolation virtual capacitors in our employing program of the calculating of non-work economic equivalent, step and the order of calculating are as follows:
1) virtual capacitor is added;
2) calculate add network loss after capacitor slippage, the lifting of minimum voltage point voltage, the lifting of power factor;
3) virtual capacitor is deleted;
4) step 1-3 is repeated.
Searching optimal compensation point is rely on three-phase power flow, and the result that Load flow calculation obtains is to the accurate analogy method of distribution network.
Find current have compensation point most after, utilize the curved line relation of compensation capacity as shown in Figure 1 and loss, adopt " two point of three Curve Approximation Method " to calculate optimal compensation capacity.
As shown in Figure 2, " two point of three Curve Approximation Method " rudimentary algorithm is:
Test by current test value, current experiment value is in that region of curve, then the feeder loss under test value is calculated, with the new value obtained reduce compensation experiment value span (span of beginning be 0 to feeder line total reactive capability between), carry out new round calculating with the mid point of new interval as new test value.
" two point of three curve " calculates new test value with dichotomy, and determine next computation interval according to result of calculation.By between theory analysis proof compensation capacity and feeder loss being the relation of " conic section ", so we adopt the method for 3 line segmentation curves to approach optimal solution fast, test proves just can find the compensation condenser value of enough accuracy (0.001kVA) for the calculating that the load feeder line of tens nodes is general at 3-5 time.
Claims (1)
1. be applied to a shunt capacitors on a distribution feeder collocation method for online closed loop power flow Optimization analyses, it is characterized in that: first on calculating feeder line, each may install the non-work economic equivalent of the point of compensation condenser; Secondly, optimal compensation point is searched; Finally on the optimal compensation point of non-work economic equivalent, compensate optimal compensation capacity; The computational methods of described non-work economic equivalent comprise the steps:
1) virtual capacitor is added;
2) calculate add network loss after capacitor slippage, the lifting of minimum voltage point voltage, the lifting of power factor;
3) virtual capacitor is deleted;
4) step 1 is repeated)-3);
The method of searching optimal compensation point relies on three-phase power flow; After finding current optimal compensation point, utilize the curved line relation of compensation capacity and loss, adopt two point of three Curve Approximation Method to calculate optimal compensation capacity; The computational methods of described two point of three Curve Approximation Method are: test by current test value, current experiment value is in that region of curve, then the feeder loss under test value is calculated, reduce the span of compensation experiment value by the new value obtained, carry out new round calculating with the mid point of new interval as new test value.
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| CN201310537867.6A CN103683279B (en) | 2013-11-04 | 2013-11-04 | A kind of shunt capacitors on a distribution feeder collocation method being applied to online closed loop power flow Optimization analyses |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723721A (en) * | 2012-05-31 | 2012-10-10 | 西南交通大学 | Power system reactive power optimization method based on individual optimal position self-adaptive variation disturbance particle swarm algorithm |
| CN102055196B (en) * | 2010-12-20 | 2012-11-28 | 南京软核科技有限公司 | 10 kv-distribution network reactive power compensation optimization method in power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055196B (en) * | 2010-12-20 | 2012-11-28 | 南京软核科技有限公司 | 10 kv-distribution network reactive power compensation optimization method in power system |
| CN102723721A (en) * | 2012-05-31 | 2012-10-10 | 西南交通大学 | Power system reactive power optimization method based on individual optimal position self-adaptive variation disturbance particle swarm algorithm |
Non-Patent Citations (1)
| Title |
|---|
| 城区配电网合环电流分析与仿真;李晓柯等;《经济策论（下）》;20111231;第79-81页 * |
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