CN104600710A - Control method for reactive power compensation system - Google Patents
Control method for reactive power compensation system Download PDFInfo
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- CN104600710A CN104600710A CN201410099825.3A CN201410099825A CN104600710A CN 104600710 A CN104600710 A CN 104600710A CN 201410099825 A CN201410099825 A CN 201410099825A CN 104600710 A CN104600710 A CN 104600710A
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- reactive power
- compensation
- reactive
- power compensator
- control method
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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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- Supply And Distribution Of Alternating Current (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The invention discloses a control method for a reactive power compensation system, a parallel connection type reactive power compensation system comprises an alternating current power supply, a load and a reactive power compensation system, the load is connected with the output end of the alternating current power supply, the reactive power compensation system is connected with the load in a parallel mode and comprises a control unit and a plurality of reactive power compensation devices, the control method of the control unit comprises the following steps: step 1, calculating the reactive power compensation amount Q for the system; step 2, calculating the sum F of the rated compensation capacity of the first to the n<th> reactive power compensation devices, n is the natural number less than N; step 3, judging the relationship between the sum F of the rated compensation capacity of the first to the n<th> reactive power compensation devices and the required reactive power compensation amount Q, if F is greater than or equal to Q, offering the rated compensation capacity by the first to n-1<th> reactive power compensation devices, offering the remaining reactive power compensation capacity by the n<th> reactive power compensation device, otherwise, adding another reactive power compensation device and turning to the step 2.
Description
Technical field
The present invention relates to reactive power compensation technology field, particularly relate to a kind of Large Copacity parallel connection type reactive compensation system and control method thereof.
Background technology
In electric power system, cause power loss for avoiding power device to provide a large amount of reactive current to power distribution network, all need in each isoelectric point (as low-tension transformer and large-scale electric equipment installation place) reactive power compensator configuring relevant voltage grade.Be limited to the high cost of high-capacity power switching device, usually that multiple reactive power compensator is in parallel in known technology, carry out mixed compensation.When using multiple reactive power compensator to carry out mixed compensation, there is the problem of the how each reactive power compensator of coordinated operation, such as, how to make reactive power compensator can not overcompensation, if always use wherein some or several reactive power compensator simultaneously, and other reactive power compensators idle, the useful life of system will certainly be reduced like this.
Therefore prior art need a kind of can the technology of effective coordination parallel connection type reactive power compensator, to solve above technical problem.
Summary of the invention
The object of the present invention is to provide the control method of reactive compensation system, the reactive power compensator in system is made to work in full load condition or close to fully loaded state, thus the switch operating frequency in reduction reactive power compensator, reduce the switching loss of device, and reduce electromagnetic interference.
To achieve these goals, technical scheme of the present invention is: a kind of control method for reactive compensation system, described parallel connection type reactive compensation system comprises, AC power, load, reactive compensation system, described load is connected to the output of AC power, described reactive compensation system and described load parallel connection, described reactive compensation system comprises control unit, the first reactive power compensator to N reactive power compensator, N be more than or equal to 1 natural number, the control method of described control unit comprises following steps:
The reactive power compensation amount Q of step one computing system demand;
Step 2 calculate the first to the n-th reactive power compensator specified compensation capacity and F;
That step 3 judges the specified compensation capacity of the first to the n-th reactive power compensator and relation between the reactive power compensation amount Q of F and system requirements, if F is greater than or equal to Q, so provide specified compensation capacity by the first to the (n-1)th reactive power compensator, n-th reactive power compensator provides remaining reactive compensation capacity, otherwise increase a reactive power compensator again, and jump to step 2.
In a specific embodiment of the present invention, after described reactive compensation system runs certain time length, described control unit uses the reactive power compensator of non-operating state to replace the reactive power compensator run.
In a specific embodiment of the present invention, when first to N reactive power compensator specified compensation capacity and when being still less than the reactive compensation capacity Q of demand, make first to be operated in full load condition to N reactive power compensator.
In a specific embodiment of the present invention, if described remaining reactive power compensation demand is significantly less than the specified compensation capacity of a reactive power compensator, another reactive power compensator is then made to operate in undercapacity operating state, increase described remaining reactive power compensation demand, and provided by a described reactive power compensator.
In a specific embodiment of the present invention, if N number of reactive power compensator has identical specified compensation capacity q, so d=Q/q, if n≤d < is n+1, so, have n reactive power compensator full-load run, the (n+1)th device provides remaining reactive power compensation amount.
Compared with prior art, technical scheme of the present invention can make the reactive power compensator run in reactive compensation system be operated in full load condition to greatest extent, reduces the operating frequency of device breaker in middle, reduces switching loss, thus improves the efficiency of device.
By following description also by reference to the accompanying drawings, the present invention will become more clear, and these accompanying drawings are for explaining embodiments of the invention.
Accompanying drawing explanation
Fig. 1 is the embodiment block diagram of Large Copacity parallel connection type reactive compensation system of the present invention.
Fig. 2 is a specific embodiment block diagram of control method of the present invention.
Fig. 3 is another specific embodiment block diagram of control method of the present invention.
Embodiment
Be illustrated in figure 1 the embodiment block diagram of the present invention one Large Copacity parallel connection type reactive compensation system, AC power AC exchanges input for system provides, the output of AC power AC is connected with load 110, load 110 can produce reactive power, in order to improve the power factor of system, adopt reactive compensation system 120 in parallel with load 110, carry out reactive power compensation, described reactive compensation system 120 comprises, N number of reactive power compensator, above-mentioned reactive power compensator is parallel with one another, for system 10 provides reactive power compensation, wherein the specified compensation capacity of reactive power compensator 121 is Q1, the specified compensation capacity of reactive power compensator 122 is Q2, the specified compensation capacity of reactive power compensator 123 is Q3.The present invention controls the compensation rate of each compensation arrangement by control unit 130, its control objectives to make reactive power compensator operate in full load condition, the number of times that so just can reduce the switching of equipment breaker in middle device reduces switching loss with this, reduces electromagnetic interference.
Incorporated by reference to the control method that Fig. 1 and Fig. 2, Fig. 2 are control unit realization in Fig. 1.The reactive power compensation amount Q of step 210 computing system demand, that step 220 calculates the specified compensation capacity of the first to the n-th reactive power compensator and F, step 230 judges the magnitude relationship of F and Q, if F is greater than or equal to Q, so perform step 240, first provides specified compensation capacity to (n-1) reactive power compensator, n-th reactive power compensator provides remaining reactive compensation capacity, otherwise perform step 250, then increase a reactive power compensator, re-execute step 220,230.When reactive power compensators all in reactive compensation system specified compensation capacity and when being still less than the reactive compensation capacity of system requirements, make all reactive power compensator work of reactive compensation system provide specified compensation capacity, work in full load condition.
By control method of the present invention, reactive power compensator provides specified compensation capacity, and reactive power compensator also namely can be made to be in full-load run to greatest extent, like this to reduce the number of times that reactive power compensator breaker in middle unit switches, reduce switching loss, reduce electromagnetic interference.
In addition, in reactive compensation system running, if one of them or certain several reactive power compensator is in running status, still have the reactive power compensator being in non-operating state, so after timing operation certain time length, control unit will use the reactive power compensator of non-operating state to replace the reactive power compensator run.
Referring again to Fig. 3, in the present embodiment and Fig. 2, the difference of embodiment is, the present embodiment increases such one in step 340 and judges link, judge remaining reactive compensation capacity (Q-F) whether much smaller than the nominal reactive compensation capacity of the n-th reactive power compensator, i.e. step 340: μ Qn >=Q-F, wherein μ is a proportionality coefficient, as 0.1 or less numerical value, if judged result is yes, perform step 341 first and provide specified compensation capacity to (n-2) reactive power compensator, (n-1)th reactive power compensator is operated in undercapacity state, n-th reactive power compensator provides remaining reactive compensation capacity, the state of the n-th reactive power compensator work extremely underloading can be avoided like this.The operating efficiency of system can be improved thus.If judged result is no, perform step 342 first and provide specified compensation capacity to (n-1) reactive power compensator, the n-th reactive power compensator provides remaining reactive compensation capacity.
Embodiments of the invention extend in larger reactive compensation system, such as, have N number of reactive power compensator in system, also can realize effective reactive power compensation by the control mode of Fig. 2 or Fig. 3.In addition, if this N number of reactive power compensator has identical specified compensation capacity q, so d=Q/q can be passed through, if n≤d < is n+1, so, have n reactive power compensator full-load run, the (n+1)th device provides remaining reactive power compensation amount, when if remaining reactive power compensation amount is less, also can use n-th and n+1 reactive power compensator share.
Claims (5)
1. the control method for reactive compensation system, described parallel connection type reactive compensation system comprises, AC power, load, reactive compensation system, described load is connected to the output of AC power, described reactive compensation system and described load are in parallel, and described reactive compensation system comprises control unit, the first reactive power compensator to N reactive power compensator, N be more than or equal to 1 natural number, it is characterized in that, the control method of described control unit comprises following steps:
The reactive power compensation amount Q of step one computing system demand;
Step 2 calculate the first to the n-th reactive power compensator specified compensation capacity and F, n be the natural number being less than N;
That step 3 judges the specified compensation capacity of the first to the n-th reactive power compensator and relation between the reactive power compensation amount Q of F and system requirements, if F is greater than or equal to Q, so provide specified compensation capacity by the first to the (n-1)th reactive power compensator, n-th reactive power compensator provides remaining reactive compensation capacity, otherwise increase a reactive power compensator again, and jump to step 2.
2. as claimed in claim 1 for the control method of reactive compensation system, it is characterized in that: when first to N reactive power compensator specified compensation capacity and be still less than the reactive power compensation amount Q of demand time, make first to provide specified compensation to N reactive power compensator.
3. as claimed in claim 1 for the control method of reactive compensation system, it is characterized in that: after described reactive compensation system runs certain time length, described control unit uses the reactive power compensator of non-operating state to replace the reactive power compensator run.
4. as claimed in claim 1 for the control method of reactive compensation system, it is characterized in that: if described remaining reactive power compensation demand is significantly less than the specified compensation capacity of a reactive power compensator, another reactive power compensator is then made to operate in undercapacity operating state, increase described remaining reactive power compensation demand, and provided by a described reactive power compensator.
5. as claimed in claim 1 for the control method of reactive compensation system, it is characterized in that: if N number of reactive power compensator has identical specified compensation capacity q, so d=Q/q, if n≤d < is n+1, so, have n reactive power compensator full-load run, the (n+1)th device provides remaining reactive power compensation amount.
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| CN201410099825.3A CN104600710B (en) | 2013-10-31 | 2014-03-18 | A kind of control method for reactive compensation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199386A (en) * | 2018-01-23 | 2018-06-22 | 国网江苏省电力有限公司苏州供电分公司 | A kind of transmission system power regulating method |
| CN108736488A (en) * | 2018-04-20 | 2018-11-02 | 苏州中康电力开发有限公司 | Control method for reactive compensation system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203243047U (en) * | 2013-01-08 | 2013-10-16 | 湖北华云电气有限公司 | Mixed type continuous reactive power compensator in low-voltage complete equipment |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203243047U (en) * | 2013-01-08 | 2013-10-16 | 湖北华云电气有限公司 | Mixed type continuous reactive power compensator in low-voltage complete equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199386A (en) * | 2018-01-23 | 2018-06-22 | 国网江苏省电力有限公司苏州供电分公司 | A kind of transmission system power regulating method |
| CN108736488A (en) * | 2018-04-20 | 2018-11-02 | 苏州中康电力开发有限公司 | Control method for reactive compensation system |
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