CN103683279A - Feed line capacitor configuration method applied to on-line loop closing trend optimization analysis - Google Patents
Feed line capacitor configuration method applied to on-line loop closing trend optimization analysis Download PDFInfo
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- CN103683279A CN103683279A CN201310537867.6A CN201310537867A CN103683279A CN 103683279 A CN103683279 A CN 103683279A CN 201310537867 A CN201310537867 A CN 201310537867A CN 103683279 A CN103683279 A CN 103683279A
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Abstract
The invention discloses a feed line capacitor configuration method applied to on-line loop closing trend optimization analysis. The method comprises: first of all, calculating the reactive economic equivalents of points, which may be provided with compensation capacitors, on a feed line; secondly, searching for an optimal compensation point; and finally, compensating an optimum compensation capacity on the optimal compensation point of the reactive economic equivalents. According to the invention, the optimal compensation capacitor value is calculated by use of a bisection three curve approximation method for realizing optimal configuration of a feed line capacitor so that the accuracy of an on-line loop closing trend optimization analysis result is ensured.
Description
Technical field
The present invention relates to a kind of shunt capacitors on a distribution feeder collocation method that online cyclization tide optimization is analyzed that is applied to.
Background technology
For simplifying power system operating mode, suppress short circuit current level, improve 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 while restoring electricity, generally adopt the operator scheme of unlinking after first cyclization to avoid user to have a power failure, improve user's power supply reliability.
During due to Loop Closing Operation, may produce larger cyclization trend, cause apparatus overload or relaying protection action, cause Loop Closing Operation failure or have a power failure.If protection tripping, may cause device damage or upper level protection action, expand power failure range.Because the operation conditions of electrical network after cyclization is opaque to scheduling operations staff; management and running personnel are difficult to prejudge by rule of thumb the reliability of Loop Closing Operation; probably because cyclization trend is excessive, cause apparatus overload or trip protection after cyclization; finally cause Loop Closing Operation failure, cause user to have a power failure or electric equipment damage etc.Because cyclization trend size is difficult to direct prediction, in order to prevent device damage, be to adopt break-before-make principle to operate sometimes, cause user to have a power failure in short-term, this has sacrificed mains supply reliability, in the important load power supply areas such as urban district, is unacceptable.Therefore, before carrying out Loop Closing Operation, should carry out the budget of cyclization trend, the situation after involutive ring accomplishes to know what's what, and guarantees Loop Closing Operation success, improves power supply reliability.In situation with good conditionsi, should pass through the in-service monitoring of involutive ring trend, follow the tracks of the time dependent situation of cyclization trend size, being chosen in the moment that cyclization trend is less carries out the operation of cyclization solution, improves the success rate of Loop Closing Operation.
In carrying out online cyclization tide optimization analytic process, shunt capacitors on a distribution feeder configuration has a great impact online cyclization tide optimization precision of analysis tool.
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 that online cyclization tide optimization is analyzed that is applied to, and guarantees online cyclization tide optimization precision of analysis.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: be a kind ofly applied to the shunt capacitors on a distribution feeder collocation method that online cyclization tide optimization is analyzed, first calculate that on feeder line, each may install the idle Economic Equivalent of the point of compensation condenser; Secondly, search optimal compensation point; Finally on the optimal compensation point of idle Economic Equivalent, compensate optimal compensation capacity.
Preferably, the computational methods of described idle Economic Equivalent comprise the steps:
1) add virtual capacitor;
2) slippage, the lifting of minimum voltage point voltage, the lifting of power factor of network loss after calculating interpolation capacitor;
3) delete virtual capacitor;
4) repeating step 1)-3).
The method of preferably, searching optimal compensation point is to rely on Three-phase Power Flow to calculate.
Preferably, after finding current optimal compensation point, utilize the curved line relation of compensation capacity and loss, three Curve Approximation Methods calculate optimal compensation capacity to adopt two minutes.
Preferably, the computational methods of described two minutes three Curve Approximation Methods are: with current test value test, current experiment value that region in curve, then calculate the feeder loss under test value, by the new value obtaining, dwindle the span of compensation experiment value, with the mid point of new interval, as new test value, carry out new round calculating.
The present invention adopts two minutes three Curve Approximation Methods to calculate optimum compensation condenser value, realizes the allocation optimum of shunt capacitors on a distribution feeder, thereby guarantees online cyclization tide optimization precision of analysis.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 is between compensation capacity and feeder loss, to be " conic section ";
Fig. 2 is two minutes three Curve Approximation Method flow charts.
Embodiment
In fact capacitor arrangements is exactly first to calculate that on feeder line, each may install " the idle Economic Equivalent " of the point of compensation condenser, namely with identical compensation capacity, fall and damage maximum points, after finding optimum " idle Economic Equivalent " point, compensate at that point most suitable capacity, fall and damage maximum and can not cause the optimal compensation capacity under grid equipment overload or over-voltage condition.
Idle Economic Equivalent---its physical significance is the compensation condenser of every installation 1kVar, and network active loss reduces how many kilowatts.
After finding the optimal compensation capacity of first compensation point, restart to search the calculating of next compensation point, until reached the required precision of setting or all calculated complete.
The method of adding virtual capacitor at all calculative points in our employing program of the calculating of idle Economic Equivalent is calculated, and the step of calculating and order are as follows:
1) add virtual capacitor;
2) slippage, the lifting of minimum voltage point voltage, the lifting of power factor of network loss after calculating interpolation capacitor;
3) delete virtual capacitor;
4) repeating step 1-3.
Searching optimal compensation point is to rely on Three-phase Power Flow to calculate, and the result that trend calculates is to the accurate analogy method of distribution network.
Finding current having most after compensation point, utilizing compensation capacity as shown in Figure 1 and the curved line relation of loss, adopting " two minutes three Curve Approximation Methods " to calculate optimal compensation capacity.
As shown in Figure 2, " two minutes three Curve Approximation Methods " rudimentary algorithm is:
With current test value test, current experiment value that region in curve, then calculate the feeder loss under test value, by the new value obtaining, dwindle the span (span of beginning be 0 between total reactive capability of feeder line) of compensation experiment value, with the mid point of new interval, as new test value, carry out new round calculating.
" two minutes three curves " are to calculate new test value with dichotomy, and determine next computation interval according to result of calculation.By theory analysis, prove between compensation capacity and feeder loss it is the relation of " conic section ", so we adopt the method that 3 lines are cut apart curve to approach fast optimal solution, evidence for the load feeder line of tens nodes general calculating at 3-5 time, just can find the compensation condenser value of enough accuracy (0.001kVA).
Claims (5)
1. be applied to the shunt capacitors on a distribution feeder collocation method that online cyclization tide optimization is analyzed, it is characterized in that: first calculate that on feeder line, each may install the idle Economic Equivalent of the point of compensation condenser; Secondly, search optimal compensation point; Finally on the optimal compensation point of idle Economic Equivalent, compensate optimal compensation capacity.
2. the shunt capacitors on a distribution feeder collocation method that is applied to online cyclization tide optimization analysis according to claim 1, is characterized in that: the computational methods of described idle Economic Equivalent comprise the steps:
1) add virtual capacitor;
2) slippage, the lifting of minimum voltage point voltage, the lifting of power factor of network loss after calculating interpolation capacitor;
3) delete virtual capacitor;
4) repeating step 1)-3).
3. the shunt capacitors on a distribution feeder collocation method that is applied to online cyclization tide optimization analysis according to claim 2, is characterized in that: the method for searching optimal compensation point is to rely on Three-phase Power Flow to calculate.
4. be according to claim 3ly applied to the shunt capacitors on a distribution feeder collocation method that online cyclization tide optimization is analyzed, it is characterized in that: after finding current optimal compensation point, utilize the curved line relation of compensation capacity and loss, three Curve Approximation Methods calculate optimal compensation capacity to adopt two minutes.
5. be according to claim 4ly applied to the shunt capacitors on a distribution feeder collocation method that online cyclization tide optimization is analyzed, it is characterized in that: the computational methods of described two minutes three Curve Approximation Methods are: with current test value test, current experiment value that region in curve, then calculate the feeder loss under test value, by the new value obtaining, dwindle the span of compensation experiment value, with the mid point of new interval, as new test value, carry out new round calculating.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634003A (en) * | 2015-01-30 | 2016-06-01 | 华北电力大学 | Virtual capacitance-based weak AC network MMC system control strategy |
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| 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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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105634003A (en) * | 2015-01-30 | 2016-06-01 | 华北电力大学 | Virtual capacitance-based weak AC network MMC system control strategy |
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