CN101510692A - Reactive power compensating controller and method for switching capacitance - Google Patents
Reactive power compensating controller and method for switching capacitance Download PDFInfo
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- CN101510692A CN101510692A CNA2009100810883A CN200910081088A CN101510692A CN 101510692 A CN101510692 A CN 101510692A CN A2009100810883 A CNA2009100810883 A CN A2009100810883A CN 200910081088 A CN200910081088 A CN 200910081088A CN 101510692 A CN101510692 A CN 101510692A
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Abstract
The invention discloses a reactive power compensation controller and a method for switching capacitors, pertaining to the electric system field. The method comprises: a self-connected S route capacitor is checked and recorded; according to checking results, separate compensation routes N, common compensation routes M and each route of capacitor respectively in N routes for separate compensation and in M routes for common compensation are determined; according to the separate compensation routes, common compensation routes and each route of capacitor respectively in N routes for separate compensation and in M routes for common compensation, the capacitance sum of various capacitors available for switching and the corresponding various capacitor assembled modes are counted and the results thereof are saved; and reactive power vacancy is checked, and when needing to be switched, the capacitors are switched in accordance with the saved results and the capacitance needed to be switched, wherein, S is equal to N plus M, N is more than or equal to 1, M is more than or equal to 0 or M is more than or equal to 1, N is more than or equal to 0. The reactive power compensation controller comprises a checking and recording module, a determining module, a statistics saving module and a switching module. The controller and the method have the advantages of simple operation and high reliability and promote the response speed when switching the capacitors.
Description
Technical field
The present invention relates to field of power, particularly the method for reactive power compensating controller and switching capacitance.
Background technology
Alternating current is in by pure resistance, and electric energy has all changed into heat energy, and does not do work in by pure capacitive or pure inductive load, and that is to say does not have consumed power, is reactive power.
The effect that reactive power compensation device is born in power supply system is the power factor that improves electrical network, reduces the loss of supply transformer and conveying circuit, improves power supplying efficiency, improves the power supply environment.So reactive power compensation device is in an indispensable very important position in power supply system.The input that reactive power compensating controller comes control capacitor according to the size and the character of reactive power in the electrical network and withdraw from electrical network remains in the set point power factor in the electrical network.
At present, the controller ' s intellectualization degree in the reactive power compensator is not high, requires the user in use, imports more parameter, and if parameter be provided with improperly, can make that compensation effect is undesirable, influenced the further popularization of product.
Summary of the invention
The embodiment of the invention provides the method for reactive power compensating controller and switching capacitance.Described technical scheme is as follows:
A kind of method of switching capacitance may further comprise the steps:
Detect and write down the S road electric capacity that links to each other with self;
According to described testing result, determine to divide mend a way N, mend each the road electric capacity that is used for the M road of common benefit in each road electric capacity on the N road that is used for the branch benefit in way M and the described S road electric capacity that links to each other with self, the described S road electric capacity that links to each other with self altogether;
Mend way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether according to described branch, add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and statistics is stored;
Detect no-power vacancy, when the needs switching capacitance,, carry out switching capacitance according to the described statistics of storage and the capacitance of needs switching;
Wherein, S=N+M, N 〉=1, M 〉=0, perhaps N 〉=0, M 〉=1.
Further, described according to described branch benefit way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether, add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and the statistics storage comprised:
Mend way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether according to described branch, add up every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching;
The described every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching that count are stored in the mapping table.
Described detection no-power vacancy, when the needs switching capacitance, carry out switching capacitance according to the described statistics of storage and the capacitance of needs switching and be:
Detect the no-power vacancy and the building-out capacitor of switching;
When described no-power vacancy during, calculate the capacitance of needs switching according to the described no-power vacancy and the building-out capacitor sum of switching greater than the minimum capacity A in the described S road electric capacity that links to each other with self;
The capacitance of switching is searched in described statistics and the described close corresponding various electric capacity compound modes of the capacitance sum that can be used for switching of capacitance that need switching as required;
In described statistics in the various electric capacity compound modes corresponding, select one each road electric capacity of switching changed minimum compound mode with the described capacitance capacitance sum close, that can be used for switching that needs switching;
Compound mode switching building-out capacitor according to above-mentioned change minimum.
Described when described no-power vacancy during greater than the minimum capacity A in the described S road electric capacity that links to each other with self, the capacitance that calculates the needs switching according to the described no-power vacancy and the building-out capacitor sum of switching comprises:
When described no-power vacancy during, calculate the described no-power vacancy and the building-out capacitor sum B of switching greater than described minimum capacity A;
As the capacitance that needs switching, wherein K is the constant between 0 to 1 with B-KA.
The method of the embodiment of the invention is used simply, reliability is high, the response speed when having improved switching capacitance.
A kind of reactive power compensating controller comprises:
The detection record module is used to detect and write down the S road electric capacity that links to each other with self;
Determination module, be used for according to described testing result, determine to divide mend a way N, mend each the road electric capacity that is used for the M road of common benefit in each road electric capacity on the N road that is used for the branch benefit in way M and described each road electric capacity that links to each other with self, described each road electric capacity that links to each other with self altogether;
The statistics memory module, be used for mending way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether according to described branch, add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and statistics is stored;
The switching module is used to detect no-power vacancy, when the needs switching capacitance, according to the described statistics of storage and the capacitance of needs switching, carries out switching capacitance;
Wherein, S=N+M, N 〉=1, M 〉=0, perhaps N 〉=0, M 〉=1.
Further, described statistics memory module comprises:
Statistic unit, be used for mending way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether, add up every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching according to described branch;
Memory cell, the described every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching that are used for counting are stored in mapping table.
Described switching module comprises:
Detecting unit is used to detect the no-power vacancy and the building-out capacitor of switching;
Computing unit is used for when described no-power vacancy during greater than the minimum capacity A of the described S road electric capacity that links to each other with self, calculates the capacitance of needs switching according to the described no-power vacancy and the building-out capacitor sum of switching;
Search the unit, be used for the capacitance of switching as required, in described statistics, search and the described close corresponding various electric capacity compound modes of the capacitance sum that can be used for switching of capacitance that need switching;
Selected cell is used in the described statistics various electric capacity compound modes corresponding with the described capacitance capacitance sum close, that can be used for switching that needs switching, selects one each road electric capacity of switching changed minimum compound mode;
The switching unit is used for the compound mode switching building-out capacitor according to above-mentioned change minimum.
Described computing unit comprises:
First subelement is used for when described no-power vacancy during greater than described minimum capacity A, calculates the described no-power vacancy and the building-out capacitor sum B of switching;
Second subelement is used for B-KA as the capacitance that needs switching, and wherein K is the constant between 0 to 1.
The reactive power compensating controller of the embodiment of the invention uses simply, reliability is high, the response speed when having improved switching capacitance.
Description of drawings
Fig. 1 is the method flow diagram of the switching capacitance that provides of the embodiment of the invention one;
Fig. 2 is each road electric capacity and capability value thereof that a kind of and reactive power compensating controller that the embodiment of the invention one provides links to each other;
Fig. 3 is the structural representation of the reactive power compensating controller that provides of the embodiment of the invention two.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment one
The embodiment of the invention provides a kind of method of switching capacitance, as shown in Figure 1, may further comprise the steps:
110: detect and write down the S road electric capacity that links to each other with self.
In electric power system, reactive power compensating controller and at least one road (such as the S road, S 〉=1) capacitor group is connected.Reactive power compensating controller can detect the S road electric capacity that links to each other with self, and writes down the capability value of each road electric capacity.In the embodiment of the invention with the three-phase voltage U of system
T1, U
T2, U
T3Certain electric power system that is respectively 220V, frequency and is 50 hertz is the example explanation.Be located in this electric power system, the capacitor that links to each other with reactive power compensating controller has 6 groups.
120:, determine to divide mend a way N, mend each the road electric capacity that is used for the M road of common benefit in each road electric capacity on the N road that is used for the branch benefit in way M and the described S road electric capacity that links to each other with self, the S road electric capacity that links to each other with self altogether according to above-mentioned testing result.
According to above-mentioned testing result, reactive power compensating controller can determine in the S road electric capacity that links to each other with self have the N road to divide and mend electric capacity, and electric capacity is mended on the M road altogether, and the capability value of benefit electric capacity and the capability value that electric capacity is mended on each road are altogether divided in each road.Wherein, S=N+M, N 〉=1, M 〉=0, perhaps N 〉=0, M 〉=1.
With above-mentioned electric power system is example, if in 6 group capacitors that link to each other with reactive power compensating controller, first group, second group, the 3rd group and the 4th group is used for common benefit (promptly mending electric capacity altogether), and its rated voltage is 400V, capability value be respectively 3KVAR (kilovar), 4KVAR, 5KVAR, 6KVAR; The 4th group, the 5th group and the 6th group is used for branch benefit (promptly divide and mend electric capacity), and their rated voltage is 250V, and capability value is respectively 1KVAR, 2KVAR.Equate with every electric capacity of mending the capacitor group altogether in the present embodiment that every electric capacity that same branch is mended the capacitor group equates.
The mode of connection of reactive power compensating controller and above-mentioned 6 group capacitors is: the first via lead-in wire (hereinafter to be referred as 1 tunnel) of reactive power compensating controller connects first group of electric capacity; The second pass line (hereinafter to be referred as 2 tunnel) connects second group of electric capacity; Third Road lead-in wire (hereinafter to be referred as 3 tunnel) connects the 3rd group of electric capacity; The 4th pass line (hereinafter to be referred as 4 tunnel) connects the 4th group of electric capacity; The 5th pass line (hereinafter to be referred as 5 tunnel), the 6th pass line (hereinafter to be referred as 6 tunnel), the 7th pass line (hereinafter to be referred as 7 tunnel) connect first phase, second phase, the third phase of the 5th group of electric capacity respectively; The 8th pass line (hereinafter to be referred as 8 tunnel), the 9th pass line (hereinafter to be referred as 9 tunnel), the tenth pass line (hereinafter to be referred as 10 tunnel) connect first phase, second phase, the third phase of the 6th group of electric capacity respectively.That is: the 1 tunnel, the 2 tunnel, the 3 tunnel, the 4 tunnel are used for common benefit, and 5 the tunnel, the 6 tunnel, the 7 tunnel, the 8 tunnel, the 9 tunnel, the 10 tunnel are used for branch mends.This shows the electric capacity that links to each other with reactive power compensating controller in the present embodiment totally 10 tunnel, i.e. S=10.As shown in Figure 2, the top of Fig. 2 is each road wiring of reactive power compensating controller, and the capability value of the electric capacity that the bottom is connect for each road wiring, unit are kilovar.As seen from Figure 2, mending way M altogether is 4, and dividing benefit way N is 6.
130: according to minute mending a way N, mending way M and above-mentioned each road electric capacity, above-mentioned each road electric capacity that is used for the M road of common benefit that is used for the N road that branch mends altogether, add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and statistics is stored.
Reactive power compensating controller is mended way N, above-mentioned each road electric capacity of mending way M altogether and being used for the N road that branch mends, is used for each road electric capacity on the M road of common benefit according to above-mentioned branch, adds up every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching.
With above-mentioned electric power system is example, and reactive power compensating controller determines that according to top testing result dividing the minimum capacity of added time is 1KVAR, and the minimum capacity of added time is 3KVAR altogether.
Through statistics, 6 road electric capacity that are used for the branch benefit are total
Plant combination.At this
Plant in the combination, 9 kinds of capacity can be provided, be respectively: 1KVAR, 2KVAR, 3KVAR, 4KVAR, 5KVAR, 6KVAR, 7KVAR, 8KVAR, 9KVAR.The possible compound mode of each the capacity correspondence in above-mentioned 9 kinds of capacity is:
The 1KVAR:5 road;
Optional two-way among the 2KVAR:5,6,7 tunnel is perhaps in 8,9, the 10 tunnel optional one the tunnel
3KVAR: the 5th group of electric capacity selects entirely, perhaps adds in the 6th group of electric capacity optional a road in the 5th group of electric capacity after optional one the tunnel;
4KVAR: the optional two-way of the 6th group of electric capacity perhaps adds in the 6th group of electric capacity optional a road behind the 5th group of optional two-way of electric capacity;
5KVAR: the full choosing of the 5th group of electric capacity adds in the 6th group of electric capacity optional a road, perhaps adds two-way optional in the 6th group of electric capacity after optional one the tunnel in the 5th group of electric capacity;
6KVAR: the 6th group of electric capacity selects entirely, perhaps adds two-way optional in the 6th group of electric capacity behind the optional two-way in the 5th group of electric capacity;
7KVAR: the full choosing of the 5th group of electric capacity adds two-way optional in the 6th group of electric capacity, perhaps adds in the 5th group of electric capacity optional a road after the 6th group of full choosing of electric capacity;
8KVAR: add that the 6th group of electric capacity selects entirely behind the 5th group of optional two-way of electric capacity;
9KVAR: the 5th group of full choosing of electric capacity adds that the 6th group of electric capacity selects entirely.
4 road electric capacity that are used for common benefit are total
Plant combination.At this
Plant in the combination, 14 kinds of capacity can be provided, be respectively: 3KVAR, 4KVAR, 5KVAR, 6KVAR, 7KVAR, 8KVAR, 9KVAR, 10KVAR, 11KVAR, 12KVAR, 13KVAR, 14KVAR, 15KVAR, 18KVAR.
The possible compound mode of each the capacity correspondence in above-mentioned 14 kinds of capacity is added up according to top mode and is drawn, and no longer describes in detail herein.
The various electric capacity compound modes that every kind of counting can be can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching in the embodiment of the invention are stored in the mapping table, wherein, capacity and the corresponding various electric capacity compound modes mapping relations that are one-to-manies.
140: detect no-power vacancy, when the needs switching capacitance,, carry out switching capacitance according to the described statistics of storage and the capacitance of needs switching.
Reactive power compensating controller detects the no-power vacancy of above-mentioned electric power system and the building-out capacitor of switching, when in detecting above-mentioned electric power system no-power vacancy being arranged, judges that whether this no-power vacancy is greater than the minimum capacity in the S road electric capacity that links to each other with self.If this no-power vacancy is greater than the minimum capacity in the S road electric capacity that links to each other with self, calculate the capacitance of needs switching according to this no-power vacancy and the building-out capacitor sum of switching; The capacitance of switching is searched the corresponding various electric capacity compound modes of the capacitance sum that can be used for switching close with the capacitance that needs switching in above-mentioned statistics as required; The capacitance sum that can be used for switching corresponding various electric capacity compound modes close with the capacitance that needs switching in above-mentioned statistics select one each road electric capacity of switching changed minimum compound mode; Compound mode switching building-out capacitor according to above-mentioned change minimum.If this no-power vacancy is not more than the minimum capacity in the S road electric capacity that links to each other with self, then do not carry out the operation of switching capacitance.
The embodiment of the invention is the example narration to drop into electric capacity, and principle is identical therewith for the situation of excision electric capacity.Suppose that it is 0.5KVAR that reactive power compensating controller detects the T2 phase of above-mentioned electric power system (three-phase of establishing above-mentioned electric power system is respectively T1 phase, T2 phase, T3 phase) no-power vacancy, because the minimum capacity capacity in ten road electric capacity that link to each other with reactive power compensating controller is 1KVAR, so the operation that does not drop into electric capacity this moment.
If it is 3KVAR that reactive power compensating controller detects each building-out capacitor that has dropped into mutually of above-mentioned electric power system, T1 phase, T2 phase, T3 phase no-power vacancy are respectively 0.8KVAR, 1.5KVAR, 3KVAR.Because T2 phase, T3 phase no-power vacancy are greater than the minimum capacity capacity 1KVAR in ten road electric capacity that link to each other with reactive power compensating controller, the operation that this moment T2 phase, T3 is dropped into electric capacity mutually is specific as follows described:
When no-power vacancy during, calculate this no-power vacancy and the building-out capacitor sum B that has dropped into greater than the minimum capacity A (1KVAR) in ten road electric capacity that link to each other with reactive power compensating controller.That is: to the T2 phase, 1.5KVAR adds 3KVAR, and obtaining B is 4.5KVAR; To the T3 phase, 3KVAR adds 3KVAR, and obtaining B is 6KVAR.
With the capacitance that B-KA drops into as needs, wherein K is the constant between 0 to 1.It is 0.2 that the embodiment of the invention can be got K, and then to the T2 phase, B-KA is 4.3KVAR; To the T3 phase, B-KA is 5.8KVAR.
Capacitance according to the needs that calculate in above-mentioned statistics of storing in the step 130 and the step 140 drop into drops into electric capacity.Promptly according to the T2 that the calculates capacitance 4.3KVAR that drops into of needs mutually, T3 needs the capacitance 5.8KVAR that drops into mutually, in step 130, find respectively in the above-mentioned statistics of storage and be not more than 4.3KVAR and 5.8KVAR, and with they immediate capacity, just 4KVAR and 5KVAR drop into respectively.When dropping into, select a compound mode of current each road electric capacity that has dropped into being changed minimum.If current each 3KVAR building-out capacitor that has dropped into is mutually mended electric capacity altogether and is obtained by dropping into 1 the tunnel.For when dropping into, current each road electric capacity that has dropped into is changed minimum so, then keep 1 the tunnel to mend electric capacity altogether, mean that so T2 has dropped into 3KVAR mutually with T3 mutually, T2 also lacks 1KVAR and 2KVAR respectively mutually with T3 mutually.Generally speaking, can divide benefit earlier, mend altogether again.So (just 5,6,7 tunnel in the optional one tunnel) input of according to the statistics of storage in the step 130, can choose a tunnel mutually in the 5th group of electric capacity to T2 is such as 5 the tunnel.Can drop into 6 the tunnel, the 7 tunnel mutually to T3, (just 8,9, the 10 tunnel in optional one the tunnel) drops into also can to choose one the tunnel in the 6th group of electric capacity wantonly.Divide after the benefit, no-power vacancy is less than the minimum capacity in ten road electric capacity that link to each other with reactive power compensating controller, so no longer carry out common benefit in the present embodiment.
If behind the double input electric capacity of reactive power compensating controller, no-power vacancy is differential more than 1.5 times minimum capacity, then enters self check, regenerates the compound mode of electric capacity.When dropping into, the electric capacity of required input and the capacity ratio that has dropped into, if capacity is arranged etc., then this road electric capacity is kept intact.Newly drop into electric capacity if desired, then see if there is the electric capacity of same capability,, then see the electric capacity number of times whether the input number of times of this electric capacity drops into greater than needs, decide with this and throw any road electric capacity if having.If power factor (such as 0.9～0.99) then reactive power compensating controller does not carry out switching in setting range.
The S road electric capacity that reactive power compensating controller regularly detects and record links to each other with self in the present embodiment, if change (fault having taken place such as certain road electric capacity) has taken place in electric capacity way that links to each other with self or capability value, then withdraw from the electric capacity of all switchings, enter self check, and the electric capacity that has damaged and switch not as the switching index, again add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and former statistics is upgraded the back storage.No-power vacancy appears in system, when needing switching capacitance, reactive power compensating controller will be according to the above-mentioned statistics of storage and the capacitance of needs switching, directly in above-mentioned statistics, select an electric capacity combination to carry out switching capacitance, the response speed when having improved switching capacitance.
The method of the embodiment of the invention is used simply, reliability is high, the response speed when having improved switching capacitance.
Embodiment two
The embodiment of the invention provides a kind of reactive power compensating controller, as shown in Figure 3, comprising:
Detection record module 301 is used to detect and write down the S road electric capacity that links to each other with self.
In electric power system, reactive power compensating controller and at least one road (such as the S road, S 〉=1) capacitor group is connected.Reactive power compensating controller can detect the S road electric capacity that links to each other with self, and writes down the capability value of each road electric capacity.In the embodiment of the invention with the three-phase voltage U of system
T1, U
T2, U
T3Certain electric power system that is respectively 220V, frequency and is 50 hertz is the example explanation.Be located in this electric power system, the capacitor that links to each other with reactive power compensating controller has 6 groups.
Determination module 302, be used for according to described testing result, determine to divide mend a way N, mend each the road electric capacity that is used for the M road of common benefit in each road electric capacity on the N road that is used for the branch benefit in way M and described each road electric capacity that links to each other with self, described each road electric capacity that links to each other with self altogether.Wherein, S=N+M, N 〉=1, M 〉=0, perhaps N 〉=0, M 〉=1.
With above-mentioned electric power system is example, if in 6 group capacitors that link to each other with reactive power compensating controller, first group, second group, the 3rd group and the 4th group is used for common benefit (promptly mending electric capacity altogether), and its rated voltage is 400V, capability value be respectively 3KVAR (kilovar), 4KVAR, 5KVAR, 6KVAR; The 4th group, the 5th group and the 6th group is used for branch benefit (promptly divide and mend electric capacity), and their rated voltage is 250V, and capability value is respectively 1KVAR, 2KVAR.Equate with every electric capacity of mending the capacitor group altogether in the present embodiment that every electric capacity that same branch is mended the capacitor group equates.
Referring to Fig. 2, the mode of connection of reactive power compensating controller and above-mentioned 6 group capacitors is: the 1 tunnel, the 2 tunnel, the 3 tunnel, the 4 tunnel are used for common benefit, and 5 the tunnel, the 6 tunnel, the 7 tunnel, the 8 tunnel, the 9 tunnel, the 10 tunnel are used for branch mends.This shows the electric capacity that links to each other with reactive power compensating controller in the present embodiment totally 10 tunnel, i.e. S=10.The top of Fig. 2 is each road wiring of reactive power compensating controller, and the capability value of the electric capacity that the bottom is connect for each road wiring, unit are kilovar.As seen from Figure 2, mending way M altogether is 4, and dividing benefit way N is 6.
Statistics memory module 303, be used for mending way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether according to described branch, add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and statistics is stored.
Reactive power compensating controller is mended way N, above-mentioned each road electric capacity of mending way M altogether and being used for the N road that branch mends, is used for each road electric capacity on the M road of common benefit according to above-mentioned branch, adds up every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching.
Switching module 304 is used to detect no-power vacancy, when the needs switching capacitance, according to the described statistics of storage and the capacitance of needs switching, carries out switching capacitance.
Reactive power compensating controller detects the no-power vacancy of above-mentioned electric power system and the building-out capacitor of switching, when in detecting above-mentioned electric power system no-power vacancy being arranged, judges that whether this no-power vacancy is greater than the minimum capacity in the S road electric capacity that links to each other with self.If this no-power vacancy is greater than the minimum capacity in the S road electric capacity that links to each other with self, calculate the capacitance of needs switching according to this no-power vacancy and the building-out capacitor sum of switching; The capacitance of switching is searched the corresponding various electric capacity compound modes of the capacitance sum that can be used for switching close with the capacitance that needs switching in above-mentioned statistics as required; The capacitance sum that can be used for switching corresponding various electric capacity compound modes close with the capacitance that needs switching in above-mentioned statistics select one each road electric capacity of switching changed minimum compound mode; Compound mode switching building-out capacitor according to above-mentioned change minimum.If this no-power vacancy is not more than the minimum capacity in the S road electric capacity that links to each other with self, then do not carry out the operation of switching capacitance.
Further, statistics memory module 303 comprises:
Statistic unit, be used for mending way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether, add up every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching according to described branch;
Memory cell, the described every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching that are used for counting are stored in a mapping table.
With above-mentioned electric power system is example, and reactive power compensating controller determines that according to top testing result dividing the minimum capacity of added time is 1KVAR, and the minimum capacity of added time is 3KVAR altogether.
Through statistics, 6 road electric capacity that are used for the branch benefit are total
Plant combination.At this
Plant in the combination, 9 kinds of capacity can be provided, be respectively: 1KVAR, 2KVAR, 3KVAR, 4KVAR, 5KVAR, 6KVAR, 7KVAR, 8KVAR, 9KVAR.The possible compound mode of each the capacity correspondence in above-mentioned 9 kinds of capacity sees embodiment one for details, repeats no more herein.
4 road electric capacity that are used for common benefit are total
Plant combination.At this
Plant in the combination, 14 kinds of capacity can be provided, be respectively: 3KVAR, 4KVAR, 5KVAR, 6KVAR, 7KVAR, 8KVAR, 9KVAR, 10KVAR, 11KVAR, 12KVAR, 13KVAR, 14KVAR, 15KVAR, 18KVAR.The possible compound mode of each the capacity correspondence in above-mentioned 14 kinds of capacity draws according to adding up with top identical mode.
Switching module 304 comprises:
Detecting unit is used to detect the no-power vacancy and the building-out capacitor of switching;
Computing unit is used for when described no-power vacancy during greater than the minimum capacity of the described S road electric capacity that links to each other with self, calculates the capacitance of needs switching according to the described no-power vacancy and the building-out capacitor sum of switching;
Search the unit, be used for the capacitance of switching as required, in described statistics, search and the described close corresponding various electric capacity compound modes of the capacitance sum that can be used for switching of capacitance that need switching;
Selected cell is used in described statistics and the described close corresponding various electric capacity compound modes of the capacitance sum that can be used for switching of capacitance that need switching, selects each the road electric capacity to switching to change minimum compound mode;
The switching unit is used for the compound mode switching building-out capacitor according to above-mentioned change minimum.
Wherein, computing unit comprises:
First subelement is used for when described no-power vacancy during greater than described minimum capacity A, calculates the described no-power vacancy and the building-out capacitor sum B of switching;
Second subelement is used for B-KA as the capacitance that needs switching, and wherein K is the constant between 0 to 1.
The embodiment of the invention is the example narration to drop into electric capacity, and principle is identical therewith for the situation of excision electric capacity.Suppose that it is 0.5KVAR that reactive power compensating controller detects the T2 phase of above-mentioned electric power system (three-phase of establishing above-mentioned electric power system is respectively T1 phase, T2 phase, T3 phase) no-power vacancy, because the minimum capacity capacity in ten road electric capacity that link to each other with reactive power compensating controller is 1KVAR, so the operation that does not drop into electric capacity this moment.
If it is 3KVAR that reactive power compensating controller detects each building-out capacitor that has dropped into mutually of above-mentioned electric power system, T1 phase, T2 phase, T3 phase no-power vacancy are respectively 0.8KVAR, 1.5KVAR, 3KVAR.Because T2 phase, T3 phase no-power vacancy are greater than the minimum capacity capacity 1KVAR in ten road electric capacity that link to each other with reactive power compensating controller, the operation that this moment T2 phase, T3 is dropped into electric capacity mutually is specific as follows described:
When no-power vacancy during, calculate this no-power vacancy and the building-out capacitor sum B that has dropped into greater than the minimum capacity A (1KVAR) in ten road electric capacity that link to each other with reactive power compensating controller.That is: to the T2 phase, 1.5KVAR adds 3KVAR, and obtaining B is 4.5KVAR; To the T3 phase, 3KVAR adds 3KVAR, and obtaining B is 6KVAR.
With the capacitance that B-KA drops into as needs, wherein K is the constant between 0 to 1.It is 0.2 that the embodiment of the invention can be got K, and then to the T2 phase, B-KA is 4.3KVAR; To the T3 phase, B-KA is 5.8KVAR.
According to the T2 that the calculates capacitance 4.3KVAR that drops into of needs mutually, T3 needs the capacitance 5.8KVAR that drops into mutually, in statistics memory module 303, find respectively in the above-mentioned statistics of storage and be not more than 4.3KVAR and 5.8KVAR, and with they immediate capacity, just 4KVAR and 5KVAR drop into respectively.If current each 3KVAR building-out capacitor that has dropped into is mutually mended electric capacity altogether and is obtained by dropping into 1 the tunnel.For when dropping into, current each road electric capacity that has dropped into is changed minimum so, then keep 1 the tunnel to mend electric capacity altogether, mean that so T2 has dropped into 3KVAR mutually with T3 mutually, T2 also lacks 1KVAR and 2KVAR respectively mutually with T3 mutually.Generally speaking, can divide benefit earlier, mend altogether again.So (just 5,6,7 tunnel in the optional one tunnel) input of according to the statistics of storage in the statistics memory module 303, can choose a tunnel mutually in the 5th group of electric capacity to T2 is such as 5 the tunnel.Can drop into 6 the tunnel, the 7 tunnel mutually to T3, (just 8,9, the 10 tunnel in optional one the tunnel) drops into also can to choose one the tunnel in the 6th group of electric capacity wantonly.Divide after the benefit, no-power vacancy is less than the minimum capacity in ten road electric capacity that link to each other with reactive power compensating controller, so no longer carry out common benefit in the present embodiment.
If behind the double input electric capacity of reactive power compensating controller, no-power vacancy is differential more than 1.5 times minimum capacity, then enters self check, regenerates the compound mode of electric capacity.When dropping into, the electric capacity of required input and the capacity ratio that has dropped into, if capacity is arranged etc., then this road electric capacity is kept intact.Newly drop into electric capacity if desired, then see if there is the electric capacity of same capability,, then see the electric capacity number of times whether the input number of times of this electric capacity drops into greater than needs, decide with this and throw any road electric capacity if having.If power factor (such as 0.9～0.99) then reactive power compensating controller does not carry out switching in setting range.
The S road electric capacity that detection record module 301 regularly detects and record links to each other with self in the present embodiment, if change (fault having taken place such as certain road electric capacity) has taken place in electric capacity way that links to each other with self or capability value, reactive power compensating controller will withdraw from the electric capacity of all switchings, enter self check, and the electric capacity that has damaged and switch not as the switching index, statistics memory module 303 can be added up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching again, and former statistics is upgraded the back storage.No-power vacancy appears in system, when needing switching capacitance, switching module 304 will directly select an electric capacity combination to carry out switching capacitance, the response speed when having improved switching capacitance in above-mentioned statistics according to the above-mentioned statistics of storage and the capacitance of needs switching.
The reactive power compensating controller of the embodiment of the invention uses simply, reliability is high, the response speed when having improved switching capacitance.
The embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, for example, and in hard disk, buffer memory or the CD.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the method for a switching capacitance is characterized in that, may further comprise the steps:
Detect and write down the S road electric capacity that links to each other with self;
According to described testing result, determine to divide mend a way N, mend each the road electric capacity that is used for the M road of common benefit in each road electric capacity on the N road that is used for the branch benefit in way M and the described S road electric capacity that links to each other with self, the described S road electric capacity that links to each other with self altogether;
Mend way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether according to described branch, add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and statistics is stored;
Detect no-power vacancy, when the needs switching capacitance,, carry out switching capacitance according to the described statistics of storage and the capacitance of needs switching;
Wherein, S=N+M, N 〉=1, M 〉=0, perhaps N 〉=0, M 〉=1.
2. the method for switching capacitance as claimed in claim 1, it is characterized in that, described according to described branch benefit way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether, add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and the statistics storage comprised:
Mend way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether according to described branch, add up every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching;
The described every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching that count are stored in the mapping table.
3. the method for switching capacitance as claimed in claim 1 is characterized in that, described detection no-power vacancy when the needs switching capacitance, carries out switching capacitance according to the described statistics of storage and the capacitance of needs switching and is:
Detect the no-power vacancy and the building-out capacitor of switching;
When described no-power vacancy during, calculate the capacitance of needs switching according to the described no-power vacancy and the building-out capacitor sum of switching greater than the minimum capacity A in the described S road electric capacity that links to each other with self;
The capacitance of switching is searched in described statistics and the described close corresponding various electric capacity compound modes of the capacitance sum that can be used for switching of capacitance that need switching as required;
In described statistics in the various electric capacity compound modes corresponding, select one each road electric capacity of switching changed minimum compound mode with the described capacitance capacitance sum close, that can be used for switching that needs switching;
Compound mode switching building-out capacitor according to above-mentioned change minimum.
4. the method for switching capacitance as claimed in claim 3, it is characterized in that, described when described no-power vacancy during greater than the minimum capacity A in the described S road electric capacity that links to each other with self, the capacitance that calculates the needs switching according to the described no-power vacancy and the building-out capacitor sum of switching comprises:
When described no-power vacancy during, calculate the described no-power vacancy and the building-out capacitor sum B of switching greater than described minimum capacity A;
As the capacitance that needs switching, wherein K is the constant between 0 to 1 with B-KA.
5. a reactive power compensating controller is characterized in that, comprising:
The detection record module is used to detect and write down the S road electric capacity that links to each other with self;
Determination module, be used for according to described testing result, determine to divide mend a way N, mend each the road electric capacity that is used for the M road of common benefit in each road electric capacity on the N road that is used for the branch benefit in way M and described each road electric capacity that links to each other with self, described each road electric capacity that links to each other with self altogether;
The statistics memory module, be used for mending way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether according to described branch, add up the multiple various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching, and statistics is stored;
The switching module is used to detect no-power vacancy, when the needs switching capacitance, according to the described statistics of storage and the capacitance of needs switching, carries out switching capacitance;
Wherein, S=N+M, N 〉=1, M 〉=0, perhaps N 〉=0, M 〉=1.
6. reactive power compensating controller as claimed in claim 5 is characterized in that, described statistics memory module comprises:
Statistic unit, be used for mending way, described way and described each road electric capacity, described each road electric capacity that is used for the M road of common benefit that is used for the N road of branch benefit mended altogether, add up every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching according to described branch;
Memory cell, the described every kind of various electric capacity compound modes that can be used for the capacitance sum of switching and the capacitance sum correspondence that every kind can be used for switching that are used for counting are stored in mapping table.
7. reactive power compensating controller as claimed in claim 5 is characterized in that, described switching module comprises:
Detecting unit is used to detect the no-power vacancy and the building-out capacitor of switching;
Computing unit is used for when described no-power vacancy during greater than the minimum capacity A of the described S road electric capacity that links to each other with self, calculates the capacitance of needs switching according to the described no-power vacancy and the building-out capacitor sum of switching;
Search the unit, be used for the capacitance of switching as required, in described statistics, search and the described close corresponding various electric capacity compound modes of the capacitance sum that can be used for switching of capacitance that need switching;
Selected cell is used in described statistics and the described close corresponding various electric capacity compound modes of the capacitance sum that can be used for switching of capacitance that need switching, selects each the road electric capacity to switching to change minimum compound mode;
The switching unit is used for the compound mode switching building-out capacitor according to above-mentioned change minimum.
8. reactive power compensating controller as claimed in claim 7 is characterized in that, described computing unit comprises:
First subelement is used for when described no-power vacancy during greater than described minimum capacity A, calculates the described no-power vacancy and the building-out capacitor sum B of switching;
Second subelement is used for B-KA as the capacitance that needs switching, and wherein K is the constant between 0 to 1.
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