CN104917189B - A kind of circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power - Google Patents

A kind of circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power Download PDF

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CN104917189B
CN104917189B CN201510273802.4A CN201510273802A CN104917189B CN 104917189 B CN104917189 B CN 104917189B CN 201510273802 A CN201510273802 A CN 201510273802A CN 104917189 B CN104917189 B CN 104917189B
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CN104917189A (en
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李钦豪
张勇军
陈泽兴
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South China University of Technology SCUT
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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
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    • 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 present invention provides a kind of circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power, the specific steps are：（1）Obtain the reactive-load compensation parameter of line parameter circuit value, circuit power transmission terminal voltage and circuit receiving end；（2）OPTIMAL REACTIVE POWER power transmission power and its upper limit, lower limit are asked for by more than parameter；（3）Obtain the reactive power of circuit sending end, the load of circuit receiving end, circuit receiving end reactive-load compensation equipment input group number；（4）According to the OPTIMAL REACTIVE POWER power transmission upper limit of the power, the reactive-load compensation equipment of lower limit control circuit receiving end.The present invention proposes the circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power, the method for replacing adjusting power grid critical point reactive power by rule of thumb at present with this method can be such that line security economically runs in the case where infrequently changing reactive power definite value.

Description

A kind of circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power
Technical field
The present invention relates to the idle operation method of electric system, more particularly to a kind of power-less optimized controlling method of circuit.
Background technology
AC electric power systems is unavoidably there is reactive power, and transmission of the reactive power in power grid can aggravate power grid Voltage landing and active power loss.Reasonably control the reactive power in electric system, it is possible to reduce network voltage lands And active power loss, improve safety and the economy of operation of power networks.
At present in the traffic control of electric system, commonplace way is by the Reactive Power Control of circuit receiving end Near 0.Long-term operating experience shows that this way can relatively efficiently ensure network voltage safety.But because this Way is empirically adjusted, adjust strategy there is no by optimization, in terms of active power loss is reduced also into The room for promotion of one step.
In recent years, people propose idle work optimization many methods, attempt theoretically to solve reactive power optimization control Problem.But most optimization method, which needs to iterate to calculate, solves trend, exists in real-time idle work optimization and calculates overlong time Limitation；Or it needs, by calculating, constantly to change setting valve.
The present invention is based on OPTIMAL REACTIVE POWER power transmission power, and interval of acceptance is fallen into as control using the reactive power of circuit sending end Target, to circuit carry out idle work optimization, it can be ensured that circuit economical operation under the premise of receiving end voltage qualification is ensured；Together When, optimization process is not related to iterating to calculate, and setting valve one is computed, you can is used for a long time, does not need to change, available for power grid In real-time reactive power optimization.
Invention content
It is an object of the invention to solve the problems, such as the Reactive power control of circuit, provide a kind of based on OPTIMAL REACTIVE POWER power transmission work( The circuit power-less optimized controlling method of rate, the operation for making circuit are more economical.
A kind of circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power of the present invention, includes the following steps：
(1) parameter of circuit, the voltage U of circuit sending end are obtainedS, circuit receiving end reactive-load compensation parameter；The line The parameter on road includes line resistance RL, line reactance XLWith Xian Lu electricity Satisfied BL；The reactive-load compensation parameter of the circuit receiving end includes The single group capacity and quantity of capacitor and reactor；
(2) OPTIMAL REACTIVE POWER power transmission power Q is calculatedS.opt；
(3) circuit sending end reactive power lower limit Q is calculatedS.minWith upper limit QS.max；Circuit receiving end voltage lower limit is set ULoad.minWith upper limit ULoad.max；
(4) reactive power Q of circuit sending end is obtained in real time from power grid SCADA systemS, circuit receiving end load SLoad, circuit receiving end capacitor and reactor the group number of throwing；
(5) judge QSAnd QS.min、QS.maxRelationship, if QS.min≤QS≤QS.max, enter step (10)；If QS< QS.min, enter step (6)；If QS>QS.max, enter step (8)；
(6) judge whether circuit receiving end has capacitor not cut off, if not having, enter step (7)；If so, then pass through Load flow calculation judges to cut off whether a group capacitor can cause circuit receiving end voltage to be less than ULoad.minIf will not, cut off line One group capacitor of road receiving end, enters step (10)；If meeting, enter step (10)；
(7) judge whether circuit receiving end has reactor not put into, if not having, enter step (10)；If so, then pass through Load flow calculation judges to put into whether one group of reactor can cause circuit receiving end voltage to be less than ULoad.minIf will not, put into line One group of reactor of road receiving end, enters step (1000)；If meeting, enter step (10)；
(8) judge whether circuit receiving end has reactor not cut off, if not having, enter step (9)；If so, then pass through Load flow calculation judges to cut off whether one group of reactor can cause circuit receiving end voltage to be more than ULoad.maxIf will not, cut off line One group of reactor of road receiving end, enters step (10)；If meeting, enter step (10)；
(9) judge whether circuit receiving end has capacitor not put into, if not having, enter step (10)；If so, then pass through Load flow calculation judges to put into whether a group capacitor can cause circuit receiving end voltage to be more than ULoad.maxIf will not, put into line One group capacitor of road receiving end, enters step (10)；If meeting, enter step (10)；
(10) terminate this period Reactive power control；Wait for setting time (such as 15 minutes), return to step (4).
In the above-mentioned circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power, the OPTIMAL REACTIVE POWER power transmission work( Rate refers to make the active loss of circuit minimum, the reactive power that circuit sending end should convey, OPTIMAL REACTIVE POWER power transmission power QS.opt It is obtained by formula (1)：
Formula (1) comprising variable：Circuit power transmission terminal voltage US；Xian Lu electricity Satisfied BL。
The derivation of formula (1) is as follows：
In the π type equivalent circuits of circuit, PSFor the active power of circuit sending end, QSIdle work(for circuit sending end Rate, RLFor line resistance, PLoadFor the burden with power of circuit receiving end, formula (2) can be obtained according to active power balance：
Formula (2) is considered as about PSQuadratic equation with one unknown, solve and choose the solution that electric system is made to be in steady stability, P can be obtainedSExpression formula such as formula (3)：
By US、PLoad、RL、BLIt is considered as constant, then by formula (3) it is found that working as PSDuring the active loss minimum of minimum, i.e. circuit,
According to OPTIMAL REACTIVE POWER power transmission power QS.optMeaning, QS.optThe value of modus ponens (4).
In the above-mentioned circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power, the circuit sending end is idle Lower limit of the power QS.minWith upper limit QS.max, refer to for judging the whether qualified condition of circuit sending end reactive power, QS.minWith QS.maxIt is obtained by formula (5), formula (6)：
QS.min=QS.opt-QC.max (5)
QS.max=QS.opt+QC.max (6)
Formula (5), formula (6) comprising variable：OPTIMAL REACTIVE POWER power transmission power QS.opt；The reactive-load compensation of circuit receiving end maximum single group is held Measure QC.max。
Formula (5), the derivation of formula (6) are as follows：
In the π type equivalent circuits of circuit, PSFor the active power of circuit sending end, QSIdle work(for circuit sending end Rate, XLFor line reactance, ULoadFor the voltage of circuit receiving end, QLoadFor the burden with power of circuit receiving end, QCOMFor circuit by The reactive compensation capacity of electric end input, formula (7) can be obtained according to reactive power equilibrium：
In QS=QS.optPoint is on formula (7) both sides to QCOMDerivation, and ignore ULoadVariation, can obtain
According to QS.optMeaning, have
It can be obtained by formula (8), formula (9)
According to formula (10) local linearization, with QS.optFor the idle allowed band center of circuit sending end, it is superimposed in circuit The variable quantity of circuit sending end reactive power, can obtain Q caused by one group of maximum single group reactive compensation capacity of receiving end switchingS.minWith QS.maxFor
QS.min=QS.opt-QC.max (11)
QS.max=QS.opt+QC.max (12)
The circuit sending end reactive power lower and upper limit obtained by formula (11), formula (12), can carry out circuit The reactive power of circuit sending end is near OPTIMAL REACTIVE POWER power transmission power after Reactive power control, and will not cause idle benefit Repay equipment repeatedly switching the problem of.
In the above-mentioned circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power, the circuit sending end and line Road receiving end is with the walking direction of circuit active power, and active power flows to circuit receiving end from circuit sending end.
Compared with prior art, the beneficial effects of the present invention are：
(1) efficiently solve the Reactive Power Optimazation Problem of circuit, make circuit accomplish under the premise of voltage qualification is kept through Ji operation；
(2) the power-less optimized controlling method simple, intuitive proposed, optimization process are not related to iterating to calculate, setting valve once It calculates, you can be used for a long time, do not need to change, available in the real-time reactive power optimization of power grid.
Description of the drawings
Fig. 1 is the flow diagram of the circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power.
Specific embodiment
The specific implementation of the present invention is described further below in conjunction with attached drawing and example.
Fig. 1 reflects the idiographic flow of the circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power.Based on most The circuit power-less optimized controlling method of excellent idle power transmission power includes：
(1) parameter of circuit, the voltage U of circuit sending end are obtainedS, circuit receiving end reactive-load compensation parameter；The line The parameter on road includes line resistance RL, line reactance XLJie Di electricity Satisfied BL；The reactive-load compensation parameter of the circuit receiving end includes electricity The capacity and quantity of container and reactor；
(2) OPTIMAL REACTIVE POWER power transmission power Q is calculatedS.opt；
QS.optIt is obtained by following formula：
In formula, USFor circuit power transmission terminal voltage, BLFor line-to-ground electricity Satisfied；
(3) circuit sending end reactive power lower limit Q is calculatedS.minWith upper limit QS.max；Circuit receiving end voltage lower limit is set ULoad.minWith upper limit ULoad.max；
QS.minAnd QS.maxIt is obtained by following two formula：
QS.min=QS.opt-QC.max
QS.max=QS.opt+QC.max
In formula, QS.optFor OPTIMAL REACTIVE POWER power transmission power, QC.maxFor circuit receiving end maximum single group reactive compensation capacity；
(4) reactive power Q of circuit sending end is obtained in real time from power grid SCADA systemS, circuit receiving end load SLoad, circuit receiving end capacitor and reactor the group number of throwing；
(5) judge QSAnd QS.min、QS.maxRelationship, if QS.min≤QS≤QS.max, enter step (10)；If QS< QS.min, enter step (6)；If QS>QS.max, enter step (8)；
(6) judge whether circuit receiving end has capacitor not cut off, if not having, enter step (7)；If so, then pass through Load flow calculation judges to cut off whether a group capacitor can cause circuit receiving end voltage to be less than ULoad.minIf will not, cut off line One group capacitor of road receiving end, enters step (10)；If meeting, enter step (10)；
(7) judge whether circuit receiving end has reactor not put into, if not having, enter step (10)；If so, then pass through Load flow calculation judges to put into whether one group of reactor can cause circuit receiving end voltage to be less than ULoad.minIf will not, put into line One group of reactor of road receiving end, enters step (10)；If meeting, enter step (10)；
(8) judge whether circuit receiving end has reactor not cut off, if not having, enter step (9)；If so, then pass through Load flow calculation judges to cut off whether one group of reactor can cause circuit receiving end voltage to be more than ULoad.maxIf will not, cut off line One group of reactor of road receiving end, enters step (10)；If meeting, enter step (10)；
(9) judge whether circuit receiving end has capacitor not put into, if not having, enter step (10)；If so, then pass through Load flow calculation judges to put into whether a group capacitor can cause circuit receiving end voltage to be more than ULoad.maxIf will not, put into line One group capacitor of road receiving end, enters step (10)；If meeting, enter step (10)；
(10) terminate this period Reactive power control；Wait for next controlling cycle, return to step (4).
It is an example of the method for the present invention below, is emulated by taking certain a certain controlling cycle of 220kV circuits as an example.
(1) line resistance R is obtained to obtainL, line reactance XL, Xian Lu electricity Satisfied BLFor：
RL=6.5 Ω, XL=37.6 Ω, BL=5.1 × 10-4S
The voltage U of circuit sending endSFor：
US=231kV
The reactive-load compensation parameter of circuit receiving end is：
The reactive-load compensation parameter of 1 circuit receiving end of table
(2) OPTIMAL REACTIVE POWER power transmission power Q is calculated to obtainS.optFor：
(3) circuit sending end reactive power lower limit Q is calculated to obtainS.minWith upper limit QS.maxFor：
QS.min=QS.opt-QC.max=-13.61-10=-23.61 (Mvar)
QS.max=QS.opt+QC.max=-13.61+10=-3.61 (Mvar)
Circuit receiving end voltage lower limit U is setLoad.minWith upper limit ULoad.maxFor：
ULoad.min=213.4kV, ULoad.max=235.4kV
(4) obtain circuit sending end reactive power QSFor：
QS=0.04Mvar
The load S of circuit receiving endLoadFor：
SLoad=350+j72MVA
The group of the throwing number of circuit receiving end capacitor is 14 groups, and the group of the throwing number of reactor is 0 group；
(5) judge to obtain QS>QS.max；
(6) judge circuit receiving end does not have reactor not cut off；
(7) judge circuit receiving end has capacitor not put into, by Load flow calculation judge input one group capacitor after, line Road receiving end voltage is 228.05kV, less than ULoad.max(235.4kV) therefore, puts into a group capacitor of circuit receiving end
(8) terminate this period Reactive power control；Wait for next controlling cycle, return to step (4).
Further to embody beneficial effects of the present invention, table 2 gives the knot that circuit is adjusted reactive power by two schemes Fruit compares, and scheme 1 is to adjust reactive power by the method based on OPTIMAL REACTIVE POWER power transmission power of the present invention, and scheme 2 is by circuit Method near receiving end Reactive Power Control to 0 adjusts reactive power, and the control interval of setting is [- 10,10] Mvar.
2 Comparative result of table
Circuit active loss (MW)
Scheme 1 16.35
Scheme 2 17.47
As shown in Table 2, illustrate to use than declining 6.85% (1.12MW) using 2 circuit active loss of scheme using scheme 1 The method based on OPTIMAL REACTIVE POWER power transmission power of the present invention can be such that circuit more economic runs really.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment It limits, modification, modification, replacement, combination, the simplification made under other any Spirit Essences and principle without departing from the present invention, Equivalent substitute mode is should be, should be all included within protection scope of the present invention.

Claims (1)

1. a kind of circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power, includes the following steps：
(1) parameter of circuit, the voltage U of circuit sending end are obtainedS, circuit receiving end reactive-load compensation parameter；The ginseng of the circuit Number includes line resistance RL, line reactance XLWith line admittance BL；The reactive-load compensation parameter of the circuit receiving end includes capacitor With the single group capacity and quantity of reactor；
(2) OPTIMAL REACTIVE POWER power transmission power Q is calculatedS.opt；The OPTIMAL REACTIVE POWER power transmission power refers to active loss to make circuit most Reactive power small, that circuit sending end should convey, OPTIMAL REACTIVE POWER power transmission power QS.optIt is obtained by formula (1)：
Formula (1) comprising variable：Circuit power transmission terminal voltage US；Line admittance BL；
The derivation of formula (1) is as follows：
In the π type equivalent circuits of circuit, PSFor the active power of circuit sending end, QSFor the reactive power of circuit sending end, RL For line resistance, PLoadFor the burden with power of circuit receiving end, formula (2) can be obtained according to active power balance：
Formula (2) is considered as about PSQuadratic equation with one unknown, solve and choose the solution that electric system is made to be in steady stability, can obtain PSExpression formula such as formula (3)：
By US、PLoad、RL、BLIt is considered as constant, then by formula (3) it is found that working as PSDuring the active loss minimum of minimum, i.e. circuit,
According to OPTIMAL REACTIVE POWER power transmission power QS.optMeaning, QS.optThe value of modus ponens (4)；
(3) circuit sending end reactive power lower limit Q is calculatedS.minWith upper limit QS.max；Circuit receiving end voltage lower limit U is setLoad.min With upper limit ULoad.max；The circuit sending end reactive power lower limit QS.minWith upper limit QS.max, refer to for judging circuit sending end The whether qualified condition of reactive power, QS.minAnd QS.maxIt is obtained by formula (5), formula (6)：
QS.min=QS.opt-QC.max (5)
QS.max=QS.opt+QC.max (6)
Formula (5), formula (6) comprising variable：OPTIMAL REACTIVE POWER power transmission power QS.opt；Circuit receiving end maximum single group reactive compensation capacity QC.max；
Formula (5), the derivation of formula (6) are as follows：
In the π type equivalent circuits of circuit, PSFor the active power of circuit sending end, QSFor the reactive power of circuit sending end, XL For line reactance, ULoadFor the voltage of circuit receiving end, QLoadFor the burden with power of circuit receiving end, QCOMIt is thrown for circuit receiving end The reactive compensation capacity entered can obtain formula (7) according to reactive power equilibrium：
In QS=QS.optPoint is on formula (7) both sides to QCOMDerivation, and ignore ULoadVariation, can obtain
According to QS.optMeaning, have
It can be obtained by formula (8), formula (9)
According to formula (10) local linearization, with QS.optFor the idle allowed band center of circuit sending end, it is superimposed in circuit by electricity The variable quantity of circuit sending end reactive power, can obtain Q caused by holding one group of maximum single group reactive compensation capacity of switchingS.minWith QS.maxFor
QS.min=QS.opt-QC.max (11)
QS.max=QS.opt+QC.max (12)
The circuit sending end reactive power lower and upper limit obtained by formula (11), formula (12) can make circuit idle in progress The reactive power of circuit sending end is near OPTIMAL REACTIVE POWER power transmission power after optimal control, and reactive-load compensation will not be caused to set The problem of standby switching repeatedly；
(4) reactive power Q of circuit sending end is obtained in real time from power grid SCADA systemS, circuit receiving end load SLoad, line The group number of throwing of road receiving end capacitor and reactor；
(5) judge QSAnd QS.min、QS.maxRelationship, if QS.min≤QS≤QS.max, enter step (10)；If QS<QS.min, into Enter step (6)；If QS>QS.max, enter step (8)；
(6) judge whether circuit receiving end has capacitor not cut off, if not having, enter step (7)；If so, then pass through trend Calculating judges to cut off whether a group capacitor can cause circuit receiving end voltage to be less than ULoad.minIf will not, cut off circuit by One group capacitor at electric end, enters step (10)；If meeting, enter step (10)；
(7) judge whether circuit receiving end has reactor not put into, if not having, enter step (10)；If so, then pass through trend Calculating judges to put into whether one group of reactor can cause circuit receiving end voltage to be less than ULoad.minIf will not, put into circuit by One group of reactor at electric end, enters step (10)；If meeting, enter step (10)；
(8) judge whether circuit receiving end has reactor not cut off, if not having, enter step (9)；If so, then pass through trend Calculating judges to cut off whether one group of reactor can cause circuit receiving end voltage to be more than ULoad.maxIf will not, cut off circuit by One group of reactor at electric end, enters step (10)；If meeting, enter step (10)；
(9) judge whether circuit receiving end has capacitor not put into, if not having, enter step (10)；If so, then pass through trend Calculating judges to put into whether a group capacitor can cause circuit receiving end voltage to be more than ULoad.maxIf will not, put into circuit by One group capacitor at electric end, enters step (10)；If meeting, enter step (10)；
(10) terminate this period Reactive power control；Wait for setting time, return to step (4).
CN201510273802.4A 2015-05-26 2015-05-26 A kind of circuit power-less optimized controlling method based on OPTIMAL REACTIVE POWER power transmission power Active CN104917189B (en)

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