CN104578094B - A kind of capacitor switching method and device - Google Patents

A kind of capacitor switching method and device Download PDF

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Publication number
CN104578094B
CN104578094B CN201410805809.1A CN201410805809A CN104578094B CN 104578094 B CN104578094 B CN 104578094B CN 201410805809 A CN201410805809 A CN 201410805809A CN 104578094 B CN104578094 B CN 104578094B
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capacity
electric capacity
capacitor
substrategy
switching
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CN104578094A (en
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黎柬
冼成瑜
郑吉祥
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Shenzhen Sinexcel Electric Co Ltd
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Shenzhen Sinexcel Electric Co Ltd
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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 capacitor switching method and device, it is related to electric network reactive compensation technology, solves the switching defect not in time that the capacitor switching technology of prior art is present.Method includes：The capacity for the electric capacity being had been put into detection current electric grid undercompensation capacity and capacitor box；Undercompensation capacity and the capacity having been put into are summed to obtain total capacity；Fallen into a trap from the multichannel electric capacity of capacitor box calculate total capacity can be provided put into capacitor combination；Optimal input capacitor combination is selected from can put into capacitor combination according to the first preset strategy；Switching is carried out to the corresponding capacitance in the capacitor box according to optimal input capacitor combination.It can be combined according to the optimal capacitor switching of the undercompensation capacity or overcompensation calculation of capacity of current electric grid, and switching operation is carried out to the corresponding capacitance of capacitor box according to optimal capacitor switching combination, can be according to the timely switching capacitance of actual conditions of power network, and the power network concussion that switching is brought can be reduced.

Description

A kind of capacitor switching method and device
Technical field
The present invention relates to electric network reactive compensation technology, more specifically to a kind of capacitor switching method and device.
Background technology
High speed development and the raising of living standards of the people with national economy, people are growing to the demand of electric power, The reliability and power supply quality to power supply propose higher requirement simultaneously.Due to being continuously increased for load, and power supply is big Width increase, not only changes the network structure of power system, also changes the power distribution of system, cause the reactive power distribution of system It is unreasonable, in some instances it may even be possible to cause the universal relatively low situation of the idle wretched insufficiency in some areas, voltage level.With system architecture It is increasingly sophisticated, when system is by larger interference, it is possible to cause collapse of voltage in voltage stabilization weak link.
The selection of rational reactive-load compensation point and the determination of compensation capacity, can effectively maintain the voltage water of system It is flat, improve the voltage stability of system, it is to avoid a large amount of idle long-distance transmissions, so as to reduce active power loss, reduce generating expense With.Generally, switching control is carried out to the multichannel electric capacity in capacitor box by throw-cut device for capacitor, providing appropriate compensation for power network holds Amount, so as to be compensated to electric network reactive-load.And traditional capacitor switching technology is present for example due to every time can only one electricity of switching The defect of the switching for holding and causing not in time etc., has had a strong impact on the effect and the uniformity in electric capacity life-span of reactive-load compensation.
The content of the invention
The defect of the switching that capacitor switching technology of the present invention just to prior art is present not in time is thrown there is provided a kind of electric capacity Blanking method and device, can be according to the optimal capacitor switching group of the undercompensation capacity or overcompensation calculation of capacity of current electric grid Close, and switching operation is carried out to the corresponding capacitance of capacitor box according to optimal capacitor switching combination, switching is timely, compensation effect It is good.
The present invention solve its technical problem use technical scheme be：A kind of capacitor switching method, including following step are provided Suddenly：
The capacity for the electric capacity being had been put into S11, detection current electric grid undercompensation capacity and capacitor box；
S12, by undercompensation capacity and the capacity having been put into summation to obtain total capacity；
S13, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided put into capacitor combination；
S14, according to the first preset strategy from it is described put into capacitor combination in select optimal input capacitor combination；
S15, according to it is described it is optimal input capacitor combination in the capacitor box corresponding capacitance carry out switching.
Preferably, the capacitor box includes multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, from first tool The electric capacity for having maximum compensation capacity starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards.
Preferably, the described first default plan includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
With the substrategy for the minimum foundation of electric capacity quantity that work is participated in after switching；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the most short substrategy for foundation of working time；
With the substrategy of response speed most soon for foundation.
A kind of capacitor switching method is provided, comprised the following steps：
The capacity of the electric capacity cut off in S21, detection current electric grid overcompensation capacity and capacitor box；
S22, by overcompensation capacity and the capacity cut off summation to obtain total capacity；
S23, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided cut off capacitor combination；
S24, according to the second preset strategy from it is described cut off capacitor combination in select optimal excision capacitor combination；
S25, according to it is described it is optimal excision capacitor combination in the capacitor box corresponding capacitance carry out switching.
Preferably, the capacitor box includes multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, from first tool The electric capacity for having maximum compensation capacity starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards.
Preferably, second preset strategy includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
With the substrategy for the minimum foundation of electric capacity quantity that work is participated in after switching；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the substrategy of the up to foundation of working time；
With the substrategy of response speed most soon for foundation.
A kind of capacitor switching method is provided, comprised the following steps：
S300, the state of current electric grid is judged for undercompensation state or overcompensation state, if undercompensation state is then held Row step S301-S305, if overcompensation state then performs step S306-S310；
The capacity for the electric capacity being had been put into S301, detection current electric grid undercompensation capacity and capacitor box；
S302, by undercompensation capacity and the capacity having been put into summation to obtain total capacity；
S303, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided put into capacitor combination；
S304, according to the first preset strategy from it is described put into capacitor combination in select optimal input capacitor combination；
S305, according to it is described it is optimal input capacitor combination in the capacitor box corresponding capacitance carry out switching；
The capacity of the electric capacity cut off in S306, detection current electric grid overcompensation capacity and capacitor box；
S307, by overcompensation capacity and the capacity cut off summation to obtain total capacity；
S308, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided cut off capacitor combination；
S309, according to the second preset strategy from it is described cut off capacitor combination in select optimal excision capacitor combination；
S310, according to it is described it is optimal excision capacitor combination in the capacitor box corresponding capacitance carry out switching.
A kind of capacitor switching device is provided, including：
First detection unit, the appearance for detecting the electric capacity being had been put into current electric grid undercompensation capacity and capacitor box Amount；
First sum unit, for undercompensation capacity and the capacity having been put into be summed to obtain total capacity；
Capacitor combination computing unit can be put into, total appearance can be provided by being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box That measures puts into capacitor combination；
Optimal input capacitor combination selecting unit, for according to the first preset strategy from it is described put into capacitor combination in select Select out optimal input capacitor combination；
First control unit, for being carried out according to the optimal input capacitor combination to the corresponding capacitance in the capacitor box Switching.
A kind of capacitor switching device is provided, including：
Second detection unit, the appearance for detecting the electric capacity cut off in current electric grid overcompensation capacity and capacitor box Amount；
Second sum unit, for overcompensation capacity and the capacity cut off to be summed to obtain total capacity；
Capacitor combination computing unit can be cut off, total appearance can be provided by being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box That measures cuts off capacitor combination；
Optimal excision capacitor combination selecting unit, for according to the second preset strategy from it is described cut off capacitor combination in select Select out optimal excision capacitor combination；
Second control unit, for being carried out according to the optimal excision capacitor combination to the corresponding capacitance in the capacitor box Switching.
A kind of capacitor switching device is provided, including：
Judging unit, for judging the state of current electric grid for undercompensation state or overcompensation state；
First detection unit, for current electric grid be undercompensation state when, detection current electric grid undercompensation capacity and The capacity for the electric capacity being had been put into capacitor box；
First sum unit, for undercompensation capacity and the capacity having been put into be summed to obtain total capacity；
Capacitor combination computing unit can be put into, total appearance can be provided by being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box That measures puts into capacitor combination；
Optimal input capacitor combination selecting unit, for according to the first preset strategy from it is described put into capacitor combination in select Select out optimal input capacitor combination；
First control unit, for being carried out according to the optimal input capacitor combination to the corresponding capacitance in the capacitor box Switching；
Second detection unit, for when current electric grid state is overcompensation state, detecting current electric grid overcompensation capacity And the capacity of the electric capacity cut off in capacitor box；
Second sum unit, for overcompensation capacity and the capacity cut off to be summed to obtain total capacity；
Capacitor combination computing unit can be cut off, total appearance can be provided by being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box That measures cuts off capacitor combination；
Optimal excision capacitor combination selecting unit, for according to the second preset strategy from it is described cut off capacitor combination in select Select out optimal excision capacitor combination；
Second control unit, for being carried out according to the optimal excision capacitor combination to the corresponding capacitance in the capacitor box Switching.
The capacitor switching method and device of the present invention has the advantages that：Can be according to the undercompensation of current electric grid Capacity or the optimal capacitor switching combination of overcompensation calculation of capacity, and according to phase of the optimal capacitor switching combination to capacitor box Electric capacity is answered to carry out switching operation, can be according to the timely switching capacitance of actual conditions of power network, and the electricity that switching is brought can be reduced Net concussion.
Brief description of the drawings
Fig. 1 is the flow chart of the capacitor switching method first embodiment of the present invention；
Fig. 2 is the flow chart of the capacitor switching method second embodiment of the present invention；
Fig. 3 is the flow chart of the capacitor switching method 3rd embodiment of the present invention；
Fig. 4 is the logic diagram of the capacitor switching device first embodiment of the present invention；
Fig. 5 is the logic diagram of the capacitor switching device second embodiment of the present invention；
Fig. 6 is the logic diagram of the capacitor switching device 3rd embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of capacitor switching method and device, solve in existing capacitor switching technology by In every time can only one electric capacity of switching and the defect of the switching that causes not in time, by the undercompensation capacity according to current electric grid or The optimal capacitor switching combination of person's overcompensation calculation of capacity, and according to corresponding capacitance of the optimal capacitor switching combination to capacitor box Switching operation is carried out, so that capacitor switching is timely and reactive-load compensation effect is good.
Below in conjunction with drawings and examples the present invention will be further explained explanation.
Fig. 1 is the flow chart of the capacitor switching method first embodiment of the present invention, as shown in figure 1, in the present embodiment, electricity Hold operation/cutting method to comprise the following steps:
The capacity for the electric capacity being had been put into S11, detection current electric grid undercompensation capacity and capacitor box；
S12, by undercompensation capacity and the capacity having been put into summation to obtain total capacity；
S13, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided put into capacitor combination；
S14, according to the first preset strategy from it is described put into capacitor combination in select optimal input capacitor combination；
S15, according to it is described it is optimal input capacitor combination in the capacitor box corresponding capacitance carry out switching.
The capacitor switching method of the present invention can apply to static var compensator (SVGC), and SVGC is based on the actual need of power network What is compensated is idle, switching operation is carried out to the electric capacity in capacitor box, so as to provide corresponding compensation capacity for power network.
Specifically, in step s 11, the under-compensated capacity of static var compensator detection current electric grid (also need to for Power network provide compensation capacity), and the electric capacity being had been put into capacitance present cabinet capacity (capacity having been compensated for). In the present embodiment, capacitor box includes multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, has maximum benefit from first The electric capacity for repaying capacity starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards.That is, a capacitor box pair Should a kind of coding, in capacitor box the way of the way of electric capacity and coding can it is same can also be different.Different situations are for example, be encoded to 1:2:3:6 capacitor box only has the first via electric capacity that three road electric capacity, i.e. compensation capacity are 1Kvar, and compensation capacity is the of 2Kvar Two road electric capacity, compensation capacity is 3Kvar the 3rd road electric capacity, and the 4th road electric capacity can not be used.Identical situation is for example, be encoded to 1: 2:3:6 capacitor box has the first via electric capacity that four road electric capacity, i.e. compensation capacity are 1Kvar, and compensation capacity is 2Kvar the second tunnel Electric capacity, the 3rd road electric capacity that compensation capacity is 3Kvar and the 4th road electric capacity that compensating electric capacity is 6Kvar.In addition, it is assumed that electric capacity Cabinet using N roads coding (N belongs to natural number), first there is maximum be encoded to X roads (X be less than or equal to N), then the The coding on X road to N roads is maximum.The corresponding electric capacity of 1 coding to X-1 roads is referred to as to adjust electric capacity, X is arrived on road The corresponding electric capacity of coding on N roads is referred to as maximum capacitor, and the order of adjustment electric capacity can be random, but must be with coding pair Should, such as 1.3.2.6 coding, the compensation capacity of the capacity on first to fourth road be successively 1Kvar, 3Kvar, 2Kvar and 6Kvar。
Because since first electric capacity with maximum compensation capacity, the compensation capacity of each road electric capacity is maximum afterwards Compensation capacity, capacitive encoder such as 1:1:1:1、1:2:4:4：、1:1：2：4、1:2:3:6 and 1:2:3:6:6, such electric capacity is compiled Code have a feature, when electric capacity in capacitor box way be more than or equal to adjustment electric capacity way when, maximum compensation capacity with Interior any compensation capacity can be realized by the combination of electric capacity.When the way of electric capacity is less than the way for adjusting electric capacity, Any compensation capacity within maximum compensation capacity in capacitor combination closest to the capacitor combination of the compensation capacity by realizing. Now so that the way of electric capacity is more than the way of adjustment electric capacity and is equal to the way of coding as an example, such as 1:2:3:6 coding, it first The capacity of road electric capacity is 1Kvar, and the capacity of the second road electric capacity is 2Kvar, and the capacity of the 3rd road electric capacity is 3Kvar and the 4th tunnel The capacity of electric capacity is 6Kvar, maximum capacity be arbitrary integer capacity in 6Kvar, 1-6Kvar can by 1,2,3 and 6 group Close to realize.
In step s 12, static var compensator is by the under-compensated capacity of current electric grid and the appearance of electric capacity having been put into Amount is summed, and obtains total capacity.With 1:2:3:Exemplified by 6, the under-compensated capacity of current electric grid is 4Kvar, in four road electric capacity Second road electric capacity, which has been put into, to be used, and the total capacity (not putting into total undercompensation capacity during electric capacity) that both summations are drawn is 4+ 2=6Kvar.
In step s 13, what is calculated in capacitive encoder and step S12 of the static var compensator according to capacitor box is total The combination of the electric capacity of total capacity can be provided in capacity, the multichannel electric capacity for calculating capacitor box, you can input capacitor combination.As before The total capacity calculated in example, step S12 is 6Kvar, and the capacitive encoder of capacitor box is 1:2:3:6, therefore, it is possible to provide 6Kvar capacitor combination is 1:2:3 and 6 both, i.e., put into the first via simultaneously and to the 3rd tunnel or only put into the 6th tunnel.It is right It is less than the situation of the way of adjustment electric capacity in the way of electric capacity, selects the compensation capacity that can be provided closest to the total appearance calculated The capacitor combination of amount.
Static var compensator stores the first preset strategy, will be according to the first preset strategy from step in step S14 What S13 was calculated, which put into capacitor combination, selects optimal input capacitor combination.First preset strategy include with next or The multiple substrategys of person：Minimum (i.e. the capacitance of synchronization switching is minimum) is shaken for the substrategy of foundation, with throwing with power network The substrategy of the minimum foundation of electric capacity quantity of work, the son with electric capacity by the number of times of switching at least for foundation are participated in after cutting Strategy, for identical capacity electric capacity with the most short substrategy for foundation of working time and with most fast (the i.e. institute of response speed State that can to put into the action of capacitor switching in capacitor combination minimum) be foundation substrategy.User can select according to the actual needs Arbitrary substrategy is combined.
When using the substrategy with the minimum foundation of the capacitance of synchronization switching, power network concussion is enabled to most Smallization.Such as precedent, the capacitor combination that puts into selected in step s 13 is 1:2:3 and 6, and the second road electric capacity thrown Enter.If selection 1：2：3 combinations, then need successively the input first via and the 3rd road electric capacity, and power network synchronization needs to bear 3 lists The concussion that bit capacity is caused.If selection 6 is combined, need to cut off the second road electric capacity, put into the 4th road electric capacity, power network synchronization It is subjected to the concussion that 6 specific capacitances are caused.Therefore, according to the sub- plan of the minimum foundation of the capacitance of synchronization switching Slightly, 1 will be selected:2:3 are combined as most preferably putting into capacitor combination.
When the substrategy for the minimum foundation of electric capacity quantity for participating in work after using with switching, electricity can be protected well Hold the multiplex circuit in cabinet.Such as precedent, the capacitor combination that puts into selected in step s 13 is 1:2:3 and 6, and second Road electric capacity has been put into.If selection 1：2：3 combinations, then need 3 electric capacity in work, it is meant that the first to the 3rd tunnel totally 3 electricity Appearance is subject loss.If selection 6 is combined, need to cut off the second road electric capacity, put into the 4th road electric capacity, only the 4th road electric capacity In loss.Therefore, according to the substrategy for the minimum foundation of electric capacity quantity that work is participated in after switching, selection 6 is combined as most Good input capacitor combination.
Because the switching frequency of electric capacity is limited, therefore use with electric capacity by the number of times of switching at least for foundation Substrategy, the multiplex circuit in capacitor box can be protected well.Each electric capacity per switching once, in static var compensator Number of times of being breathed freely will increase once.Such as precedent, the capacitor combination that puts into selected in step s 13 is 1:2:3 and 6, and the second road electric capacity has been put into.First via capacitor switching 1 time, the 3rd road capacitor switching 4 times, the 4th road capacitor switching 2 times.Therefore, according to the substrategy with electric capacity by the number of times of switching at least for foundation, selection 6 is combined as optimal input Capacitor combination.For another example capacitance group is encoded to 1:2:3:4:4:4, now need to compensate 4Kvar capacity, the 4th road electric capacity again Switching 5 times, the 5th road capacitor switching 4 times, the 6th road capacitor switching 3 times, their capacity is 4, according to switching Number is criterion, then the 6th tunnel of selection input.
When substrategy for foundation most short with the working time using the electric capacity for identical capacity, work will be preferentially cut off Make the electric capacity of time length, time of preferentially devoting oneself to work short electric capacity can protect electric capacity well.Capacitance group is encoded to 1:2: 3:4:4:4, now need to compensate 4Kvar capacity again, the time that the four, the 5th and the 6th road electric capacity has worked is respectively 10th, 20 and 30 hours, the capacity of 4 units need to such as be put into, then the 4th road electric capacity of preferential input.
After each switching, it is required for being delayed by switching, therefore works as use to put into electric capacity in capacitor combination When switching action is at least the substrategy of foundation, most fast response speed can be obtained, target is most reached soon.Such as 1：2：3：6 Coding, each road electric capacity is not put into, now needs to put into the capacity of 6 units, if selection 1：2：3 combinations then need action 3 times, choosing Select 6 combinations and only need to action once.Therefore, selection 6 is combined, i.e. the 4th road electric capacity is optimal input capacitor combination.
Sometimes, using single substrategy, the optimal input capacitor combination selected is not unique.For example, 1:2:3: 6:6:The capacitance group of 6 codings, has 6 road electric capacity, it is necessary to put into the capacity of 6 units, that is selected in step S13 puts into electricity Appearance is combined as 6 combinations, and 6 combinations include the 4th road electric capacity, the 5th road electric capacity and the 6th road electric capacity.In step S14, if uniquely Use that the minimum substrategy for foundation of capacitor switching action in capacitor combination, and input the four, the 5th or the 6th can be put into Road electric capacity only needs to action once, causes no rule one to select most preferably to put into capacitor combination.At this point it is possible to select from a variety of symbols It is any in the combination of zygote strategy to select all the way as optimal input capacitor combination.The group of multiple substrategys can also be used Close.At this time, it may be necessary to be the multiple substrategys distribution priority used, the high substrategy of first the use priority is from can put into capacitance group Optimal input capacitor combination is selected to obtain the first result in conjunction, if combining not unique in the first result, the use priority time is high Substrategy select most preferably to put into capacitor combination ... by that analogy from the first result, until selecting unique optimal input Capacitor combination.For example, for can put into the action of capacitor switching in capacitor combination it is minimum be foundation substrategy distribution highest it is preferential Level, is to distribute secondary high priority by the substrategy that the number of times of switching is at least foundation with electric capacity, is for identical capacity Electric capacity minimum priority is distributed with the most short substrategy for foundation of working time, according to priority from high to low suitable Sequence, can put into capacitor combination using above-mentioned three kinds of substrategys pair and screen, and drawn when using some substrategy unique Result, then screening terminate.In this embodiment, due to having used the electric capacity of identical capacity with the most short son for foundation of working time Strategy, and the switching time of electric capacity can not possibly be equal, described is not in that All Policies have all screened the also not unique feelings of result Condition.But for other substrategys combination when when, it is as a result not unique it is possible that after having screened all word strategies Situation, now gives tacit consent to and chooses one as most preferably putting into capacitor combination.
Finally in step S15, static var compensator is according to the optimal input capacitor combination pair selected in step S14 Corresponding capacitance in capacitor box carries out switching.
In the first embodiment of the capacitor switching method of the present invention, the electric capacity from first with maximum compensation capacity is opened Begin, the compensation capacity of each road electric capacity is maximum compensation capacity afterwards, from one to the arbitrary target value between maximum compensation capacity It is idle can realize seamless compensation, while also efficiently avoid mend or owe mend cause switching concussion, protect well Electric capacity.Furthermore, optimal input capacitor combination is filtered out from all capacitor combinations put into using the first preset strategy, is led to The configuration of the first preset strategy is crossed, can further reduce the concussion of power network, and/or preferably protect electric capacity, and/or obtain more Fast response speed.
Fig. 2 is the flow chart of the capacitor switching method second embodiment of the present invention, as shown in Fig. 2 in the present embodiment, electricity Hold operation/cutting method to comprise the following steps：
The capacity of the electric capacity cut off in S21, detection current electric grid overcompensation capacity and capacitor box；
S22, by overcompensation capacity and the capacity cut off summation to obtain total capacity；
S23, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided cut off capacitor combination；
S24, according to the second preset strategy from it is described cut off capacitor combination in select optimal excision capacitor combination；
S25, according to optimal excision capacitor combination switching is carried out to the corresponding capacitance in the capacitor box.
Different from the capacitor switching method first embodiment of the present invention, in the present embodiment, concern is primarily with power network mistake The situation of compensation.
In the step s 21, static var compensator detects capacity (the unnecessary electricity put into of current electric grid overcompensation Hold), and the electric capacity cut off in capacitance present cabinet capacity (i.e. in excision state electric capacity capacity).In this implementation In example, capacitor box includes multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, has maximum compensation capacity from first Electric capacity start, the compensation capacity of each road electric capacity is maximum compensation capacity afterwards.That is, a capacitor box correspondence is a kind of Coding, the way of electric capacity same can be differed also with the way encoded.Capacitive encoder such as 1:1:1:1、1:2:4:4：、1:1：2：4、 1:2:3:6 and 1:2:3:6:6.Such capacitive encoder has any compensation capacity within a feature, maximum compensation capacity It can be realized by the combination of electric capacity.It is equal to the way of coding, 1 with the way of electric capacity:2:3:Exemplified by 6 coding, it first The capacity of road electric capacity is 1Kvar, and the capacity of the second road electric capacity is 2Kvar, and the capacity of the 3rd road electric capacity is 3Kvar and the 4th tunnel The capacity of electric capacity is 6Kvar, maximum capacity be arbitrary integer capacity in 6Kvar, 1-6Kvar can by 1,2,3 and 6 group Close to realize.
In step S22, static var compensator is by the capacity of current electric grid overcompensation and the appearance of electric capacity cut off Amount is summed, and obtains total capacity.With 1:2:3:Exemplified by 6, during the capacity of current electric grid overcompensation is 4Kvar, four road electric capacity Second road electric capacity is already cut off (i.e. in excision state), and the total capacity that both summations are drawn is 4+2=6Kvar.
In step S23, it is total that static var compensator is calculated in the capacitive encoder and step S22 according to capacitor box The combination of the electric capacity of total capacity can be provided in capacity, the multichannel electric capacity for calculating capacitor box, you can excision capacitor combination.As before The total capacity calculated in example, step S22 is 6Kvar, and the capacitive encoder of capacitor box is 1:2:3:6, therefore, it is possible to provide 6Kvar capacitor combination is 1:2:3 and 6 both (can cut off capacitor combination), i.e., cause the first via as the 3rd tunnel simultaneously It is in excision state or only causes the 6th tunnel to be in excision state.
Static var compensator stores the second preset strategy, in step s 24 will be according to the second preset strategy from step What S23 was calculated, which cut off, selects optimal excision capacitor combination in capacitor combination.Second default plan include with next or Multiple substrategys：Minimum (i.e. the capacitance of synchronization switching is minimum) is shaken for the substrategy of foundation, with switching with power network Substrategy, the sub- plan with electric capacity by the number of times of switching at least for foundation of the minimum foundation of electric capacity quantity of work are participated in afterwards Slightly, most soon (can it be cut with the substrategy of the up to foundation of working time and with response speed for the electric capacity of identical capacity Except capacitor switching action is minimum in capacitor combination) be foundation substrategy.User can select arbitrary according to the actual needs Substrategy is combined.
When using the substrategy with the minimum foundation of the capacitance of synchronization switching, power network concussion is enabled to most Smallization.Such as precedent, the capacitor combination that puts into selected in step S23 is 1:2:3 and 6, and the second road electric capacity located In excision state.If selection 1：2：3 combinations, then need successively the excision first via and the 3rd road electric capacity, and power network synchronization needs Bear the concussion that 3 unit capacitys are caused.If selection 6 is combined, need to put into the second road electric capacity, then cut off the 4th road electric capacity, Power network synchronization is subjected to the concussion that 6 specific capacitances are caused.Therefore, it is minimum according to the capacitance with synchronization switching For the substrategy of foundation, 1 will be selected:2:3 are combined as most preferably cutting off capacitor combination.
When the substrategy for the minimum foundation of electric capacity quantity for participating in work after using with switching, electricity can be protected well Hold the multiplex circuit in cabinet.Such as precedent, the capacitor combination that cuts off selected in step S23 is 1:2:3 and 6, and second Road electric capacity is in excision state.If selection 1：2：3 combinations, then need the 4th road electric capacity work, i.e., only 1 electric capacity is being held By loss.If selection 6 is combined, need to put into the second road electric capacity, cut off the 4th road electric capacity, the first via, the second tunnel and the Three road electric capacity are in work, bear loss.Therefore, according to the son for the minimum foundation of electric capacity quantity that work is participated in after switching Strategy, will select 1:2:3 are combined as most preferably cutting off capacitor combination.
Because the switching frequency of electric capacity is limited, therefore use with electric capacity by the number of times of switching at least for foundation Substrategy, the multiplex circuit in capacitor box can be protected well.Each electric capacity per switching once, in static var compensator Number of times of being breathed freely will increase once.Such as precedent, the capacitor combination that cuts off selected in step S23 is 1:2:3 and 6, and the second road electric capacity cut off.First via capacitor switching 1 time, the second road capacitor switching 1 time, the 3rd road capacitor switching 4 times, the 4th road capacitor switching 2 times.Therefore, according to the substrategy with electric capacity by the number of times of switching at least for foundation, Selection 6 is combined as most preferably putting into capacitor combination.For another example capacitance group is encoded to 1:2:3:4:4:4, existing overcompensation 4Kvar Capacity, the 4th road capacitor switching 5 times, the 5th road capacitor switching 4 times, the 6th road capacitor switching 3 times, their capacity It is 4, is criterion according to switching frequency, then the 6th road electric capacity of selection input.
When using the electric capacity for identical capacity with the substrategy of working time up to foundation, work will be preferentially cut off The electric capacity of time length, time of preferentially devoting oneself to work short electric capacity, electric capacity can be protected well.Capacitance group is encoded to 1:2:3: 4:4:4, existing overcompensation 4Kvar capacity, the time that the four, the 5th and the 6th road electric capacity has worked be respectively 10,20 with And 30 hours, it need to such as cut off the capacity of 4 units, then the 6th road electric capacity of preferential excision.
After each switching, it is required for being delayed by switching, therefore works as use to cut off electric capacity in capacitor combination When switching action is at least the substrategy of foundation, most fast response speed can be obtained, target is most reached soon.Such as 1：2：3：6 Coding, each road electric capacity has been put into, and now needs to cut off the capacity of 6 units, if selection 1：2：3 combinations then need action 3 times, choosing Select 6 combinations and only need to action once.Therefore, selection 6 is combined, i.e. the 4th road electric capacity is optimal excision capacitor combination.
Sometimes, using single substrategy, the optimal excision capacitor combination selected is not unique.For example, 1:2:3: 6:6:The capacitance group of 6 codings, has 6 road electric capacity, it is necessary to cut off the capacity of 6 units, that is selected in step S23 cuts off electricity Appearance is combined as 6 combinations, and 6 combinations include the 4th road electric capacity, the 5th road electric capacity and the 6th road electric capacity.In step s 24, if uniquely Use so that the minimum substrategy for foundation of capacitor switching action in capacitor combination can be put into, due to the four, the 5th or the 6th tunnel Electric capacity only needs to action once, causes no rule one to select most preferably to cut off capacitor combination.At this point it is possible to select to meet from a variety of It is any in the combination of substrategy to select all the way as optimal excision capacitor combination.The combination of multiple substrategys can also be used. At this time, it may be necessary to be the multiple substrategys distribution priority used, the high substrategy of first the use priority is from can cut off capacitor combination The middle optimal excision capacitor combination of selection is to obtain the first result, if combining not unique in the first result, the use priority time is high Substrategy select most preferably to cut off capacitor combination ... by that analogy from the first result, until selecting unique optimal excision Capacitor combination.For example, for can cut off the action of capacitor switching in capacitor combination it is minimum be foundation substrategy distribution highest it is preferential Level, is to distribute secondary high priority by the substrategy that the number of times of switching is at least foundation with electric capacity, is for identical capacity Electric capacity minimum priority is distributed with the substrategy of working time up to foundation, according to the order of priority from high to low, Capacitor combination can be cut off using above-mentioned three kinds of substrategys pair to screen, and unique knot has been drawn when using some substrategy Really, then screening terminates.
In the second embodiment of the capacitor switching method of the present invention, due to having the electricity of maximum compensation capacity from first Appearance starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards, according to coding the characteristics of so that from one to maximum benefit The overcompensation capacity repaid between capacity can realize seamless excision, efficiently avoid switching concussion, electric capacity is protected well. Furthermore, optimal excision capacitor combination is filtered out from all resectable capacitor combinations using the second preset strategy, passes through second The configuration of preset strategy, can further reduce the concussion of power network, and/or preferably protect electric capacity, and/or rung faster Answer speed.
Fig. 3 is the flow chart of the capacitor switching method 3rd embodiment of the present invention, as shown in figure 3, in the present embodiment, electricity Hold operation/cutting method to comprise the following steps：
S300, the state of current electric grid is judged for undercompensation state or overcompensation state, if undercompensation state is then held Row step S301-S305, if overcompensation state then performs step S306-S310；
The capacity for the electric capacity being had been put into S301, detection current electric grid undercompensation capacity and capacitor box；
S302, by undercompensation capacity and the capacity having been put into summation to obtain total capacity；
S303, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided put into capacitor combination；
S304, according to the first preset strategy from it is described put into capacitor combination in select optimal input capacitor combination；
S305, according to it is described it is optimal input capacitor combination in the capacitor box corresponding capacitance carry out switching；
The capacity of the electric capacity cut off in S306, detection current electric grid overcompensation capacity and capacitor box；
S307, by overcompensation capacity and the capacity cut off summation to obtain total capacity；
S308, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided cut off capacitor combination；
S309, according to the second preset strategy from it is described cut off capacitor combination in select optimal excision capacitor combination；
S310, according to optimal excision capacitor combination switching is carried out to the corresponding capacitance in the capacitor box.
The present embodiment and the difference of the embodiment of capacitor switching method first and second are, are provided simultaneously with capacity compensation function And capacity cuts off function during overcompensation.Detection power network first is in overcompensation state or undercompensation state, then according to inspection Survey result and carry out capacity compensation or capacity excision operation accordingly.
Fig. 4 is the logic diagram of the first embodiment of capacitor switching device 100 of the present invention, as shown in figure 4, capacitor switching is filled Putting 100 includes：
First detection unit 10, for detecting the electric capacity being had been put into current electric grid undercompensation capacity and capacitor box Capacity；
First sum unit 11, for undercompensation capacity and the capacity having been put into be summed to obtain total capacity；
Capacitor combination computing unit 12 can be put into, being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box can provide described total Capacity puts into capacitor combination；
Optimal input capacitor combination selecting unit 13, for putting into capacitor combination from described according to the first preset strategy Select optimal input capacitor combination；
First control unit 14, for entering according to the optimal input capacitor combination to the corresponding capacitance in the capacitor box Row switching.
Specifically, the first detection unit 10 detection under-compensated capacity of current electric grid (also needs to the benefit provided for power network Repay capacity), and the electric capacity being had been put into capacitance present cabinet capacity (capacity having been compensated for).In the present embodiment, Capacitor box multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, and the electric capacity from first with maximum compensation capacity is opened Begin, the compensation capacity of each road electric capacity is maximum compensation capacity afterwards.That is, an a kind of coding of capacitor box correspondence, electricity The way of appearance same can also can be differed with the way encoded.Since first electric capacity with maximum compensation capacity, afterwards The compensation capacity of each road electric capacity is maximum compensation capacity, capacitive encoder such as 1:1:1:1、1:2:4:4：、1:1：2：4、1:2:3:6 And 1:2:3:6:6.Such capacitive encoder has the task combination within a feature, maximum capacity to realize.Now with The way of electric capacity is identical with the way encoded, and 1:2:3:Exemplified by 6 coding, the capacity of its first via electric capacity is 1Kvar, the second tunnel The capacity of electric capacity is 2Kvar, and the capacity of the 3rd road electric capacity is 3Kvar and the capacity of the 4th road electric capacity is 6Kvar, maximum capacity For 6Kvar, the arbitrary integer capacity in 1-6Kvar can be realized by 1,2,3 and 6 combination.
The capacity of electric capacity of first sum unit 11 by the under-compensated capacity of current electric grid with having been put into is summed, and is obtained To total capacity.With 1:2:3:Exemplified by 6, the under-compensated capacity of current electric grid is 4Kvar, and the second road electric capacity in four road electric capacity is Come into operation, the total capacity (not putting into total undercompensation capacity during electric capacity) that both summations are drawn is 4+2=6Kvar.
Capacitor combination computing unit 12 can be put into according to the capacitive encoder of capacitor box and the total capacity calculated, electricity is calculated The combination of the electric capacity of total capacity can be provided in the multichannel electric capacity for holding cabinet, you can input capacitor combination.Such as precedent, what is calculated is total Capacity is 6Kvar, and the capacitive encoder of capacitor box is 1:2:3:6, it is 1 therefore, it is possible to provide 6Kvar capacitor combination:2:3 and 6 both, i.e., put into the first via simultaneously and as the 3rd tunnel or only put into the 6th tunnel.
The first preset strategy is stored in capacitor switching device 100, the optimal capacitor combination selecting unit 13 that puts into is by basis First preset strategy from calculate put into capacitor combination in select optimal input capacitor combination.First preset strategy includes One or more substrategy below：With the substrategy of the minimum foundation of the capacitance of synchronization switching, with ginseng after switching Substrategy with the minimum foundation of electric capacity quantity of work, with electric capacity be at least the substrategy of foundation by the number of times of switching, Electric capacity in capacitor combination most short put into for the substrategy of foundation and with described with the working time for the electric capacity of identical capacity The minimum substrategy for foundation of switching action.User can select arbitrary substrategy to be combined according to the actual needs.
When using the substrategy with the minimum foundation of the capacitance of synchronization switching, power network concussion is enabled to most Smallization.Such as precedent, the capacitor combination that puts into selected is 1:2:3 and 6, and the second road electric capacity has been put into.If selection 1： 2：3 combinations, then need the successively input first via and the 3rd road electric capacity, and power network synchronization needs to bear 3 unit capacitys to cause Concussion.If selection 6 is combined, need to cut off the second road electric capacity, put into the 4th road electric capacity, power network synchronization is subjected to 6 The concussion that specific capacitance is caused.Therefore, according to the substrategy of the minimum foundation of the capacitance of synchronization switching, it will select 1:2:3 are combined as most preferably putting into capacitor combination.
When the substrategy for the minimum foundation of electric capacity quantity for participating in work after using with switching, electricity can be protected well Hold the multiplex circuit in cabinet.Such as precedent, the capacitor combination that puts into selected is 1:2:3 and 6, and the second road electric capacity thrown Enter.If selection 1：2：3 combinations, then need 3 electric capacity in work, it is meant that totally 3 electric capacity are subject damage on the first to the 3rd tunnel Consumption.If selection 6 is combined, need to cut off the second road electric capacity, put into the 4th road electric capacity, only the 4th road electric capacity is in loss.Therefore, According to the substrategy for the minimum foundation of electric capacity quantity for participating in work after switching, selection 6 is combined as most preferably putting into capacitance group Close.
Because the switching frequency of electric capacity is limited, therefore use with electric capacity by the number of times of switching at least for foundation Substrategy, the multiplex circuit in capacitor box can be protected well.Each electric capacity per switching once, in static var compensator Number of times of being breathed freely will increase once.Such as precedent, the capacitor combination that puts into selected is 1:2:3 and 6, and the second road electricity Appearance has been put into.First via capacitor switching 1 time, the 3rd road capacitor switching 4 times, the 4th road capacitor switching 2 times.Therefore, According to the substrategy with electric capacity by the number of times of switching at least for foundation, selection 6 is combined as most preferably putting into capacitor combination.Again For example, capacitance group is encoded to 1:2:3:4:4:4, now need to compensate 4Kvar capacity again, the 4th road capacitor switching 5 times, Five road capacitor switchings 4 times, the 6th road capacitor switching 3 times, their capacity is 4, be criterion according to switching frequency, then select Select the 6th tunnel of input.
When substrategy for foundation most short with the working time using the electric capacity for identical capacity, work will be preferentially cut off The electric capacity of time length, time of preferentially devoting oneself to work short electric capacity, electric capacity can be protected well.Capacitance group is encoded to 1:2:3: 4:4:4, now need to compensate 4Kvar capacity again, the time that the four, the 5th and the 6th road electric capacity has worked is respectively 10, 20 and 30 hours, it need to such as put into the capacity of 4 units, then the 4th road electric capacity of preferential input.
After each switching, it is required for being delayed by switching, therefore works as use to put into electric capacity in capacitor combination When switching action is at least the substrategy of foundation, most fast response speed can be obtained, target is most reached soon.Such as 1：2：3：6 Coding, each road electric capacity is not put into, now needs to put into the capacity of 6 units, if selection 1：2：3 combinations then need action 3 times, choosing Select 6 combinations and only need to action once.Therefore, selection 6 is combined, i.e. the 4th road electric capacity is optimal input capacitor combination.
Sometimes, using single substrategy, the optimal input capacitor combination selected is not unique.For example, 1:2:3: 6:6:The capacitance group of 6 codings, has 6 road electric capacity, it is necessary to put into the capacity of 6 units, that is selected in step S13 puts into electricity Appearance is combined as 6 combinations, and 6 combinations include the 4th road electric capacity, the 5th road electric capacity and the 6th road electric capacity.If unique use to put into Capacitor switching acts the minimum substrategy for foundation in capacitor combination, and the four, the 5th or the 6th road electric capacity of input is only needed Act once, cause no rule one to select most preferably to put into capacitor combination.At this point it is possible to select from a variety of groups for meeting substrategy It is any in conjunction to select all the way as optimal input capacitor combination.The combination of multiple substrategys can also be used.At this time, it may be necessary to be The multiple substrategys distribution priority used, the high substrategy of first the use priority selects optimal throwing from can put into capacitor combination Enter capacitor combination and obtain the first result, if combining not unique in the first result, the high substrategy of the use priority time is from first As a result middle selection is optimal puts into capacitor combination ... by that analogy, until selecting unique optimal input capacitor combination.For example, For with can put into the action of capacitor switching in capacitor combination it is minimum be foundation substrategy assigned highest priority, be with electric capacity It is at least time high priority of the substrategy distribution of foundation by the number of times of switching, is the electric capacity for identical capacity with the working time The most short substrategy for foundation distributes minimum priority, according to the order of priority from high to low, uses above-mentioned three seeds plan It slightly pair can put into capacitor combination to screen, unique result has been drawn when using some substrategy, then screening terminates.
Finally, the first control unit 14 is entered according to the optimal input capacitor combination selected to the corresponding capacitance in capacitor box Row switching.
In the first embodiment of the capacitor switching device of the present invention, due to having the electricity of maximum compensation capacity from first Appearance starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards, according to coding the characteristics of so that from one to maximum benefit Seamless compensation can be realized by repaying the idle of the arbitrary target value between capacity, while also efficiently avoid the switching mended and caused Concussion, protects electric capacity well.Furthermore, filtered out using the first preset strategy from all capacitor combinations put into most preferably Capacitor combination is put into, by the configuration of the first preset strategy, can further reduce the concussion of power network, and/or preferably protect Electric capacity, and/or obtain faster response speed.
Fig. 5 is the logic diagram of the second embodiment of capacitor switching device 100 of the present invention, as shown in figure 5, in the present embodiment In, capacitor switching device 100 includes：
Second detection unit 20, for detecting the electric capacity cut off in current electric grid overcompensation capacity and capacitor box Capacity；
Second sum unit 21, for overcompensation capacity and the capacity cut off to be summed to obtain total capacity；
Capacitor combination computing unit 22 can be cut off, being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box can provide described total Capacity cuts off capacitor combination；
Optimal excision capacitor combination selecting unit 23, for cutting off capacitor combination from described according to the second preset strategy Select optimal excision capacitor combination；
Second control unit 24, for entering according to the optimal excision capacitor combination to the corresponding capacitance in the capacitor box Row switching.
Different from the first embodiment of capacitor switching device 100 of the present invention, in the present embodiment, concern is primarily with power network The situation of overcompensation.
Second detection unit 20 detects the capacity (the unnecessary electric capacity put into) of current electric grid overcompensation, and current electricity Hold the capacity (capacity of the electric capacity i.e. in excision state) of the electric capacity cut off in cabinet.In the present embodiment, capacitor box bag Multichannel electric capacity is included, is encoded per road electric capacity according to its compensation capacity, since first electric capacity with maximum compensation capacity, it The compensation capacity of Hou Ge roads electric capacity is maximum compensation capacity.That is, an a kind of coding of capacitor box correspondence, the road of electric capacity Number same can be differed also with the way encoded.Since first electric capacity with maximum compensation capacity, each road electric capacity afterwards Compensation capacity be maximum compensation capacity, capacitive encoder such as 1:1:1:1、1:2:4:4：、1:1：2：4、1:2:3:6 and 1:2: 3:6:6, such capacitive encoder has the task compensation capacity within a feature, maximum capacity can be by capacitor combination come real It is existing.It is now identical with the way encoded with the way of electric capacity, 1:2:3:Exemplified by 6 coding, the capacity of its first via electric capacity is 1Kvar, the capacity of the second road electric capacity is 2Kvar, and the capacity of the 3rd road electric capacity is 3Kvar and the capacity of the 4th road electric capacity is 6Kvar, maximum capacity is that the arbitrary integer capacity in 6Kvar, 1-6Kvar can be realized by 1,2,3 and 6 combination.
The capacity of electric capacity of second sum unit 21 by the capacity of current electric grid overcompensation with having cut off is summed, and is obtained To total capacity.With 1:2:3:Exemplified by 6, the capacity of current electric grid overcompensation be the second road electric capacity in 4Kvar, four road electric capacity (i.e. in excision state) is removed, the total capacity that both summations are drawn is 4+2=6Kvar.
Capacitor combination computing unit 22 can be cut off according to the capacitive encoder of capacitor box and the total capacity calculated, electricity is calculated The combination of the electric capacity of total capacity can be provided in the multichannel electric capacity for holding cabinet, you can excision capacitor combination.In such as precedent, step S22 The total capacity calculated is 6Kvar, and the capacitive encoder of capacitor box is 1:2:3:6, therefore, it is possible to provide 6Kvar capacitor combination For 1:2:3 and 6 both (capacitor combination can be cut off), i.e., simultaneously cause the first via as the 3rd tunnel be in excision state or Person only causes the 6th tunnel to be in excision state.
Capacitor switching device 100 stores the second preset strategy, and optimal excision capacitor combination selecting unit 23 will be according to the Two preset strategies from calculate cut off capacitor combination in select optimal excision capacitor combination.Second default plan includes following One or more substrategy：With the substrategy of the minimum foundation of the capacitance of synchronization switching, to participate in work after switching The substrategy of the minimum foundation of electric capacity quantity of work, with electric capacity by the number of times of switching at least for the substrategy of foundation, for The electric capacity of identical capacity is acted with the substrategy of working time up to foundation and can cut off capacitor switching in capacitor combination Minimum is the substrategy of foundation.User can select arbitrary substrategy to be combined according to the actual needs.
When using the substrategy with the minimum foundation of the capacitance of synchronization switching, power network concussion is enabled to most Smallization.Such as precedent, the capacitor combination that puts into selected is 1:2:3 and 6, and the second road electric capacity is in excision state. If selection 1：2：3 combinations, then need successively the excision first via and the 3rd road electric capacity, and power network synchronization needs to bear 3 units The concussion that capacity is caused.If selection 6 is combined, need to put into the second road electric capacity, then cut off the 4th road electric capacity, power network synchronization It is subjected to the concussion that 6 specific capacitances are caused.Therefore, according to the sub- plan of the minimum foundation of the capacitance of synchronization switching Slightly, 1 will be selected:2:3 are combined as most preferably cutting off capacitor combination.
When the substrategy for the minimum foundation of electric capacity quantity for participating in work after using with switching, electricity can be protected well Hold the multiplex circuit in cabinet.Such as precedent, the capacitor combination that cuts off selected is 1:2:3 and 6, and the second road electric capacity located In excision state.If selection 1：2：3 combinations, then need the 4th road electric capacity work, i.e., only 1 electric capacity is subject loss.If Selection 6 is combined, then needs to put into the second road electric capacity, cut off the 4th road electric capacity, the first via, the second tunnel and the 3rd road electric capacity are located In work, loss is born.Therefore, according to the substrategy for the minimum foundation of electric capacity quantity that work is participated in after switching, it will select 1:2:3 are combined as most preferably cutting off capacitor combination.
Because the switching frequency of electric capacity is limited, therefore use with electric capacity by the number of times of switching at least for foundation Substrategy, the multiplex circuit in capacitor box can be protected well.Each electric capacity per switching once, in static var compensator Number of times of being breathed freely will increase once.Such as precedent, the capacitor combination that cuts off selected is 1:2:3 and 6, and the second road electricity Appearance has been cut off.First via capacitor switching 1 time, the second road capacitor switching 1 time, the 3rd road capacitor switching 4 times, the 4th tunnel Capacitor switching 2 times.Therefore, according to the substrategy with electric capacity by the number of times of switching at least for foundation, selection 6 is combined as Optimal input capacitor combination.For another example capacitance group is encoded to 1:2:3:4:4:4, existing overcompensation 4Kvar capacity, the 4th tunnel Capacitor switching 5 times, the 5th road capacitor switching 4 times, the 6th road capacitor switching 3 times, their capacity is 4, according to throwing Number of times is cut for criterion, then the 6th road electric capacity of selection input.
When using the electric capacity for identical capacity with the substrategy of working time up to foundation, work will be preferentially cut off The electric capacity of time length, time of preferentially devoting oneself to work short electric capacity, electric capacity can be protected well.Capacitance group is encoded to 1:2:3: 4:4:4, existing overcompensation 4Kvar capacity, the time that the four, the 5th and the 6th road electric capacity has worked be respectively 10,20 with And 30 hours, it need to such as cut off the capacity of 4 units, then the 6th road electric capacity of preferential excision.
After each switching, it is required for being delayed by switching, therefore works as use to cut off electric capacity in capacitor combination When switching action is at least the substrategy of foundation, most fast response speed can be obtained, target is most reached soon.Such as 1：2：3：6 Coding, each road electric capacity has been put into, and now needs to cut off the capacity of 6 units, if selection 1：2：3 combinations then need action 3 times, choosing Select 6 combinations and only need to action once.Therefore, selection 6 is combined, i.e. the 4th road electric capacity is optimal excision capacitor combination.
Sometimes, using single substrategy, the optimal excision capacitor combination selected is not unique.For example, 1:2:3: 6:6:The capacitance group of 6 codings, has 6 road electric capacity, it is necessary to cut off the capacity of 6 units, and the capacitor combination that cuts off selected is 6 Combination, 6 combinations include the 4th road electric capacity, the 5th road electric capacity and the 6th road electric capacity.If unique use that capacitor combination can be put into The minimum substrategy for foundation of middle capacitor switching action, because the four, the 5th or the 6th road electric capacity only needs to action once, No rule one is caused to select most preferably to cut off capacitor combination.At this point it is possible to select arbitrarily to select from a variety of combinations for meeting substrategy Select out all the way as optimal excision capacitor combination.The combination of multiple substrategys can also be used.At this time, it may be necessary to multiple for what is used Substrategy distributes priority, and the high substrategy of first the use priority selects most preferably to cut off capacitor combination from can cut off capacitor combination To obtain the first result, if combining not unique in the first result, the high substrategy of the use priority time is selected from the first result Optimal excision capacitor combination ... is selected by that analogy, until selecting unique optimal excision capacitor combination.For example, for can cut It is by switching with electric capacity except the minimum substrategy assigned highest priority for foundation of capacitor switching action in capacitor combination Number of times is at least time high priority of the substrategy distribution of foundation, be for identical capacity electric capacity with the working time up to according to According to substrategy distribute minimum priority, according to the order of priority from high to low, can be cut using above-mentioned three kinds of substrategys pair Except capacitor combination is screened, unique result is drawn when using some substrategy, then screening terminates.When having used When result is not still unique after some substrategys, then acquiescence chooses one as most preferably putting into capacitor combination.
In the second embodiment of capacitor switching device 100 of the present invention, due to having maximum compensation capacity from first Electric capacity starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards, the characteristics of according to coding so that from one to maximum Overcompensation capacity between compensation capacity can realize seamless excision, efficiently avoid switching concussion, electricity is protected well Hold.Furthermore, optimal excision capacitor combination is filtered out from all resectable capacitor combinations using the second preset strategy, by the The configuration of two preset strategies, can further reduce the concussion of power network, and/or preferably protect electric capacity, and/or obtain faster Response speed.
Fig. 6 is the logic diagram of the 3rd embodiment of capacitor switching device 100 of the present invention, as shown in fig. 6, in the present embodiment In, capacitor switching device 100 includes：
Judging unit 30, for judging the state of current electric grid for undercompensation state or overcompensation state；
First detection unit 10, for current electric grid be undercompensation state when, detection current electric grid undercompensation capacity with And the capacity for the electric capacity being had been put into capacitor box；
First sum unit 11, for undercompensation capacity and the capacity having been put into be summed to obtain total capacity；
Capacitor combination computing unit 12 can be put into, being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box can provide described total Capacity puts into capacitor combination；
Optimal input capacitor combination selecting unit 13, for putting into capacitor combination from described according to the first preset strategy Select optimal input capacitor combination；
First control unit 14, for entering according to the optimal input capacitor combination to the corresponding capacitance in the capacitor box Row switching；
Second detection unit 20, for when current electric grid state is overcompensation state, the overcompensation of detection current electric grid to be held The capacity of the electric capacity cut off in amount and capacitor box；
Second sum unit 21, for overcompensation capacity and the capacity cut off to be summed to obtain total capacity；
Capacitor combination computing unit 22 can be cut off, being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box can provide described total Capacity cuts off capacitor combination；
Optimal excision capacitor combination selecting unit 23, for cutting off capacitor combination from described according to the second preset strategy Select optimal excision capacitor combination；
Second control unit 24, for entering according to the optimal excision capacitor combination to the corresponding capacitance in the capacitor box Row switching.
The present embodiment and the difference of the embodiment of capacitor switching device 100 first and second are, are provided simultaneously with capacity compensation Capacity cuts off function when function and overcompensation.Detection power network first is in overcompensation state or undercompensation state, Ran Hougen Carry out capacity compensation or capacity excision operation accordingly according to testing result.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included within scope of the presently claimed invention.

Claims (6)

1. a kind of capacitor switching method, it is characterised in that comprise the following steps：
The capacity for the electric capacity being had been put into S11, detection current electric grid undercompensation capacity and capacitor box, the capacitor box includes Multichannel electric capacity, since first electric capacity with maximum compensation capacity, the compensation capacity of each road electric capacity is maximum benefit afterwards Repay capacity；Wherein, capacitor box is encoded using N roads, and first is encoded to X roads with maximum, then X roads to N roads Coding is maximum；The corresponding electric capacity of 1 coding to X-1 roads is referred to as to adjust electric capacity, the coding on X roads to N roads Corresponding electric capacity is referred to as maximum capacitor, and N is natural number, X≤N；When the way of electric capacity in capacitor box is more than or equal to adjustment electricity During the way of appearance, any compensation capacity within maximum compensation capacity is all realized by the combination of electric capacity；When the way of electric capacity Less than adjustment electric capacity way when, any compensation capacity within maximum compensation capacity by capacitor combination closest to the compensation The capacitor combination of capacity is realized；
S12, by undercompensation capacity and the capacity having been put into summation to obtain total capacity；
S13, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided put into capacitor combination；
S14, according to the first preset strategy from it is described put into capacitor combination in select optimal input capacitor combination；
S15, according to it is described it is optimal input capacitor combination in the capacitor box corresponding capacitance carry out switching；
Wherein, the described first default plan includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
To participate in the electric capacity minimum number of switching as the substrategy of foundation；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the most short substrategy for foundation of working time；
Response speed is most the substrategy of foundation soon.
2. a kind of capacitor switching method, it is characterised in that comprise the following steps：
The capacity of the electric capacity cut off in S21, detection current electric grid overcompensation capacity and capacitor box, the capacitor box includes Multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, since first electric capacity with maximum compensation capacity, afterwards The compensation capacity of each road electric capacity is maximum compensation capacity, wherein, capacitor box is encoded using N roads, and first has maximum X roads are encoded to, then the coding on X road to N roads is maximum；The corresponding electric capacity of 1 coding to X-1 roads is referred to as Electric capacity is adjusted, the corresponding electric capacity of coding on X road to N roads is referred to as maximum capacitor, and N is natural number, X≤N；When electric in capacitor box When the way of appearance is more than or equal to the way of adjustment electric capacity, any compensation capacity within maximum compensation capacity all passes through electric capacity Combination realize；When the way of electric capacity is less than the way for adjusting electric capacity, any compensation capacity within maximum compensation capacity By being realized in capacitor combination closest to the capacitor combination of the compensation capacity；
S22, by overcompensation capacity and the capacity cut off summation to obtain total capacity；
S23, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided cut off capacitor combination；
S24, according to the second preset strategy from it is described cut off capacitor combination in select optimal excision capacitor combination；
S25, according to it is described it is optimal excision capacitor combination in the capacitor box corresponding capacitance carry out switching；
Wherein, second preset strategy includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
With the substrategy for the minimum foundation of electric capacity quantity that work is participated in after switching；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the substrategy of the up to foundation of working time；
With the substrategy of response speed most soon for foundation.
3. a kind of capacitor switching method, it is characterised in that comprise the following steps：
S300, the state of current electric grid is judged for undercompensation state or overcompensation state, if undercompensation state then performs step Rapid S301-S305, if overcompensation state then performs step S306-S310；
The capacity for the electric capacity being had been put into S301, detection current electric grid undercompensation capacity and capacitor box；
S302, by undercompensation capacity and the capacity having been put into summation to obtain total capacity；
S303, being fallen into a trap from the multichannel electric capacity of capacitor box calculates the capacitor combination that puts into that can provide the total capacity, the electricity Holding cabinet includes multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, the electric capacity from first with maximum compensation capacity Start, the compensation capacity of each road electric capacity is maximum compensation capacity afterwards, wherein, capacitor box is encoded using N roads, and first has Maximum is encoded to X roads, then the coding on X road to N roads is maximum；1 coding to X-1 roads is corresponding Electric capacity is referred to as adjusting electric capacity, and the corresponding electric capacity of coding on X road to N roads is referred to as maximum capacitor, and N is natural number, X≤N；Work as electricity When the way for holding electric capacity in cabinet is more than or equal to the way of adjustment electric capacity, any compensation capacity within maximum compensation capacity is all Realized by the combination of electric capacity；It is any within maximum compensation capacity when the way of electric capacity is less than the way for adjusting electric capacity Compensation capacity in capacitor combination closest to the capacitor combination of the compensation capacity by realizing；
S304, according to the first preset strategy from it is described put into capacitor combination in select optimal input capacitor combination；
S305, according to it is described it is optimal input capacitor combination in the capacitor box corresponding capacitance carry out switching；
The capacity of the electric capacity cut off in S306, detection current electric grid overcompensation capacity and capacitor box；
S307, by overcompensation capacity and the capacity cut off summation to obtain total capacity；
S308, fall into a trap from the multichannel electric capacity of capacitor box calculate the total capacity can be provided cut off capacitor combination；
S309, according to the second preset strategy from it is described cut off capacitor combination in select optimal excision capacitor combination；
S310, according to it is described it is optimal excision capacitor combination in the capacitor box corresponding capacitance carry out switching；
Wherein, the described first default plan includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
To participate in the electric capacity minimum number of switching as the substrategy of foundation；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the most short substrategy for foundation of working time；
With the substrategy of response speed most soon for foundation；
Wherein, second preset strategy includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
With the substrategy for the minimum foundation of electric capacity quantity that work is participated in after switching；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the substrategy of the up to foundation of working time；
With the substrategy of response speed most soon for foundation.
4. a kind of capacitor switching device, it is characterised in that including：
First detection unit (10), the appearance for detecting the electric capacity being had been put into current electric grid undercompensation capacity and capacitor box Amount；
First sum unit (11), for undercompensation capacity and the capacity having been put into be summed to obtain total capacity；
Capacitor combination computing unit (12) can be put into, total appearance can be provided by being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box That measures puts into capacitor combination, and the capacitor box includes multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, from first The individual electric capacity with maximum compensation capacity starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards, wherein, electric capacity Cabinet is encoded using N roads, and first is encoded to X roads with maximum, then the coding on X road to N roads is maximum；Will The corresponding electric capacity of 1 coding to X-1 roads is referred to as adjusting electric capacity, and the corresponding electric capacity of coding on X road to N roads is referred to as maximum Electric capacity, N is natural number, X≤N；When the way of electric capacity in capacitor box is more than or equal to the way of adjustment electric capacity, maximum compensation Any compensation capacity within capacity is all realized by the combination of electric capacity；When way of the way less than adjustment electric capacity of electric capacity When, any compensation capacity within maximum compensation capacity is by the capacitor combination in capacitor combination closest to the compensation capacity come real It is existing；
Optimal input capacitor combination selecting unit (13), for according to the first preset strategy from it is described put into capacitor combination in select Select out optimal input capacitor combination；
First control unit (14), for being carried out according to the optimal input capacitor combination to the corresponding capacitance in the capacitor box Switching；
Wherein, the described first default plan includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
To participate in the electric capacity minimum number of switching as the substrategy of foundation；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the most short substrategy for foundation of working time；
With the substrategy of response speed most soon for foundation.
5. a kind of capacitor switching device, it is characterised in that including：
Second detection unit (20), the appearance for detecting the electric capacity cut off in current electric grid overcompensation capacity and capacitor box Amount；
Second sum unit (21), for overcompensation capacity and the capacity cut off to be summed to obtain total capacity；
Capacitor combination computing unit (22) can be cut off, total appearance can be provided by being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box That measures cuts off capacitor combination, and the capacitor box includes multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, from first The individual electric capacity with maximum compensation capacity starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards, wherein, electric capacity Cabinet is encoded using N roads, and first is encoded to X roads with maximum, then the coding on X road to N roads is maximum；Will The corresponding electric capacity of 1 coding to X-1 roads is referred to as adjusting electric capacity, and the corresponding electric capacity of coding on X road to N roads is referred to as maximum Electric capacity, N is natural number, X≤N；When the way of electric capacity in capacitor box is more than or equal to the way of adjustment electric capacity, maximum compensation Any compensation capacity within capacity is all realized by the combination of electric capacity；When way of the way less than adjustment electric capacity of electric capacity When, any compensation capacity within maximum compensation capacity is by the capacitor combination in capacitor combination closest to the compensation capacity come real It is existing；
Optimal excision capacitor combination selecting unit (23), for according to the second preset strategy from it is described cut off capacitor combination in select Select out optimal excision capacitor combination；
Second control unit (24), for being carried out according to the optimal excision capacitor combination to the corresponding capacitance in the capacitor box Switching；
Wherein, second preset strategy includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
With the substrategy for the minimum foundation of electric capacity quantity that work is participated in after switching；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the substrategy of the up to foundation of working time；
With the substrategy of response speed most soon for foundation.
6. a kind of capacitor switching device, it is characterised in that including：
Judging unit (30), for judging the state of current electric grid for undercompensation state or overcompensation state；
First detection unit (10), for current electric grid be undercompensation state when, detection current electric grid undercompensation capacity and The capacity for the electric capacity being had been put into capacitor box；
First sum unit (11), for undercompensation capacity and the capacity having been put into be summed to obtain total capacity；
Capacitor combination computing unit (12) can be put into, total appearance can be provided by being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box That measures puts into capacitor combination, and the capacitor box includes multichannel electric capacity, is encoded per road electric capacity according to its compensation capacity, from first The individual electric capacity with maximum compensation capacity starts, and the compensation capacity of each road electric capacity is maximum compensation capacity afterwards, wherein, electric capacity Cabinet is encoded using N roads, and first is encoded to X roads with maximum, then the coding on X road to N roads is maximum；Will The corresponding electric capacity of 1 coding to X-1 roads is referred to as adjusting electric capacity, and the corresponding electric capacity of coding on X road to N roads is referred to as maximum Electric capacity, N is natural number, X≤N；When the way of electric capacity in capacitor box is more than or equal to the way of adjustment electric capacity, maximum compensation Any compensation capacity within capacity is all realized by the combination of electric capacity；When way of the way less than adjustment electric capacity of electric capacity When, any compensation capacity within maximum compensation capacity is by the capacitor combination in capacitor combination closest to the compensation capacity come real It is existing；
Optimal input capacitor combination selecting unit (13), for according to the first preset strategy from it is described put into capacitor combination in select Select out optimal input capacitor combination；
First control unit (14), for being carried out according to the optimal input capacitor combination to the corresponding capacitance in the capacitor box Switching；
Second detection unit (20), for when current electric grid state is overcompensation state, detecting current electric grid overcompensation capacity And the capacity of the electric capacity cut off in capacitor box；
Second sum unit (21), for overcompensation capacity and the capacity cut off to be summed to obtain total capacity；
Capacitor combination computing unit (22) can be cut off, total appearance can be provided by being calculated for being fallen into a trap from the multichannel electric capacity of capacitor box That measures cuts off capacitor combination；
Optimal excision capacitor combination selecting unit (23), for according to the second preset strategy from it is described cut off capacitor combination in select Select out optimal excision capacitor combination；
Second control unit (24), for being carried out according to the optimal excision capacitor combination to the corresponding capacitance in the capacitor box Switching；
Wherein, the described first default plan includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
To participate in the electric capacity minimum number of switching as the substrategy of foundation；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the most short substrategy for foundation of working time；
With the substrategy of response speed most soon for foundation；
Wherein, second preset strategy includes one or more following substrategy：
The substrategy of minimum foundation is shaken with power network；
With the substrategy for the minimum foundation of electric capacity quantity that work is participated in after switching；
With the substrategy of electric capacity by the number of times of switching at least for foundation；
For identical capacity electric capacity with the substrategy of the up to foundation of working time；
With the substrategy of response speed most soon for foundation.
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