CN102545241A - Multi-string SVC (Static Var Compensator) coordination control method - Google Patents
Multi-string SVC (Static Var Compensator) coordination control method Download PDFInfo
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- CN102545241A CN102545241A CN2012100252164A CN201210025216A CN102545241A CN 102545241 A CN102545241 A CN 102545241A CN 2012100252164 A CN2012100252164 A CN 2012100252164A CN 201210025216 A CN201210025216 A CN 201210025216A CN 102545241 A CN102545241 A CN 102545241A
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- control unit
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- branch road
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention relates to a multi-string SVC (Static Var Compensator) coordination control method, which comprises the following steps of: judging by an equal network loss ratio standard, selecting one of single subcircuit compensation, equidistant coordination compensation or random compensation as a compensation control scheme, and defining a var control numerical value; selecting one SVC control subcircuit as a main control unit from SVC control subcircuits in a power supply system, collecting system voltage and current signals through the main control unit; comparing the system voltage and current signals with a var control target so as to obtain a var power numerical value needed by the system; generating a compensation scheme according to compensator volume of each SVC subcircuit; and issuing a control command to a controlled unit of each subcircuit through the main control unit, and jointly executing the compensation coordination control command through the main control unit and the controlled unit of each subcircuit. According to the method, multiple var harmonic oscillation is avoided, the stability of the system is improved, the harmonic loss is reduced, and the multi-string SVC coordination control method is particularly applied to electric power supply systems constructed by stages.
Description
Technical field
The present invention relates to a kind of method, belong to the control technology field coordinating to control with the multichannel SVC reactive power compensator of paired running on the section bus.
Background technology
In recent years, along with the continuous increase of high-power nonlinear-load, reactive power impact is on the rise to the harmonic pollution that electrical network brings, the line voltage, the current distortion that cause thus, and three-phase imbalance and power factor are on the low side etc., and problem more and more receives people's attention.The SVC static passive compensation device because of have the quick adjustment system idle, keep the stable function of node voltage, in electrical network, obtained widely using.
For the power engineering project of built by separate periods, the situation of multiple branch circuit SVC device paired running on same section bus usually appears.The SVC device of different adjustment model is paired running under the situation of not coordinating control, exists closed-loop adjustment and intercouples and cause and the hidden danger of vibration cause potential security threat to system.
At present, the common method that addresses the above problem is to use the jumbo compensation equipment of separate unit to compensate, but not only can improve the cost of compensation equipment like this, also can reduce the compensation equipment reliability of operation, thereby be not a kind of selection of the best.Therefore, study a kind of control method for coordinating that is applicable to multiple branch circuit SVC paired running,, improved the stability of system, promote SVC applying in electric power system to have crucial meaning for the idle vibration of eliminating in the electrical network.
Summary of the invention
The objective of the invention is to overcome prior art deficiency, a kind of multiple branch circuit SVC control method for coordinating is provided, to avoid system harmonics vibration, improve the stability of electric power system.
Problem according to the invention is realized by following technical scheme:
A kind of multiple branch circuit SVC control method for coordinating; Whether said method is at first normally moved idle demand, electric power system SVC control branch road quantity, compensator capacity, each SVC control branch road distribution distance and each branch road according to electrical network; With etc. net decrease that little gaining rate criterion is judged and in single branch road compensation, coordinate to select in compensation or the random back-off a kind of controlling schemes by way of compensation, clear and definite idle control numerical value in proportion; Then, a selected SVC controls branch road as main control unit, by main control unit acquisition system voltage, current signal in electric power system SVC control branch road; Compare with idle controlled target; The required reactive power numerical value of the system that draws, and, generate compensation scheme according to the compensator capacity of each SVC branch road; Last main control unit with control command be issued to each branch road from control unit, and carry out compensation with each branch road jointly from control unit and coordinate control command.
Above-mentioned multiple branch circuit SVC control method for coordinating, said compensation scheme are following three kinds:
A. the compensation of single branch road: when the required compensator capacity of system is less than or equal to the compensator capacity of a certain branch road wherein, directly issues compensation to this branch road by main control unit and coordinate control command, compensate, other control unit does not participate in compensation;
B. coordinate compensation: each branch road compensating proportion K=
* 100% in proportion; Wherein,
is the required reactive power capacity of system,
be respectively with the compensator capacity of N bar branch road on the section bus;
C. random back-off: compensated jointly by the part branch road of total compensator capacity more than or equal to the required reactive power capacity of system, other branch road withdraws from.
Above-mentioned multiple branch circuit SVC control method for coordinating; In order to improve the reliability of bucking-out system; In selected main control unit; Also to select time priority control unit, when main control unit takes place when unusual, replace main control unit that each branch road SVC of operate as normal is coordinated control by inferior priority control unit.
Above-mentioned multiple branch circuit SVC control method for coordinating, main control unit should in compensation process, judge carry out to coordinate compensating instruction respectively from control unit operation whether normally, when taking place from control unit when unusual, main control unit regenerates compensation scheme.
Above-mentioned multiple branch circuit SVC control method for coordinating carries out communication through optical fiber ring network between each control unit.
Above-mentioned multiple branch circuit SVC control method for coordinating, main control unit is selected according to the size order of each control unit address code with time priority control unit, and the minimum unit of address code is a main control unit, and the address code second little unit is a time priority control unit.
The present invention can be according to distribution situation and the operating state of electrical network to idle demand and each SVC branch road; Formulate the controlling schemes of adaptive system operation; Have very strong coordination controllability and practicality, said method has not only fundamentally been avoided the idle harmonic oscillation of multichannel SVC reactive power compensator paired running existence, has improved the stability of system; But also effectively reduce reactive-load compensation equipment harmonic loss, be specially adapted to the power supply system of built by separate periods.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described further.
Fig. 1 is the electrical schematic diagram of control system;
Fig. 2 coordinates the control flow block diagram;
Fig. 3 is principal and subordinate's control unit change FB(flow block).
Each label is among the figure: T, step-up transformer; U1～Un, control unit; FC1～FCn, filter branch; TCR1～TCRn, Thyristor Controlled Reactor branch road; CF1～CFn, circuits for triggering; CJ11～CJn1, CJ12～CJn2, contactor, HW, optical fiber ring network.
Embodiment
Main control unit acquisition system voltage of the present invention, current signal; The required reactive power of the system that draws that compares with controlled target; Compensator capacity according to the SVC branch road; Generate behind the compensation scheme with instruction be issued to each branch road from control unit, main control unit and each branch road are carried out the coordination compensating instruction jointly from control unit.
Compensation can following three kinds of modes be carried out:
1, single branch road compensation: when the required compensator capacity of system is less than or equal to wherein a certain branch road compensator capacity, directly issue compensation task, compensate to this branch road by main control unit.
2, coordinate compensation in proportion: each branch road is coordinated compensation in the ratio of required reactive power capacity of system and the idle total capacity of branch road.
3, random back-off: compensated jointly by the part branch road of total compensator capacity more than or equal to the required reactive power capacity of system, other branch road withdraws from.For example: system required idle be 10Mvar, and SVC branch road 1 has the capacity of 5Mvar, branch road 2 has the capacity of 8Mvar, earlier by branch road 1 compensation 5Mvar, by branch road 2 compensation 5Mvar, subsequent leg is not carried out compensation task again.
In this process; In case main control unit takes place unusual, the systems technology characteristics change, and inferior priority control unit is converted into main control unit immediately; Anomaly unit is out of service automatically; Carry out the change of control method, reformulate coordinated control mode, and issue control command according to initial conditions.
Take place unusually from control unit, main control unit regenerates compensation scheme, issues control command, keeps the stability of system's reactive power compensation.
Carry out communication through optical fiber between each branch road, coefficient of safety is high, and coincidence circuit round robin speed can reach nanosecond.When adopting this method to coordinate to control, the loss of reactive-load compensation equipment can reduce about 2%, has well solved the key issue of reactive-load compensation equipment in electric power system is used, and is significant.
The realization of coordination control strategy is divided into following steps:
S1: according to initial conditions such as electrical network condition, SVC branch road distribution situation and each branch road operating state, the distinctive coordinated control mode of formulation system;
S2: (every table apparatus is provided with fixing address code, is greatest priority with the lowest address sign indicating number, by that analogy) selected main control unit, inferior priority control unit according to the priority principle;
S3: main control unit acquisition system voltage, current signal, the required reactive power of the system that draws that compares with controlled target is formulated concrete coordination controlling schemes;
S4: according to the compensator capacity of SVC branch road, generate behind the compensation scheme with instruction be issued to each branch road from control unit;
S5: judge whether each control unit operation of operation is normal;
S6: main control unit is unusual, then carries out S2 again, and inferior priority control unit is controlled as main control unit, carries out the execution of S3-S4 step;
S7: unusual from control unit, then carry out S3 again, formulate by main control unit and coordinate controlling schemes, instruction is issued to each branch road from control unit.
Referring to Fig. 1, n bar SVC control branch road paired running is arranged among the present invention, the compensating circuit of branch road 1 comprises filter branch FC1 and Thyristor Controlled Reactor branch road TCR1; Control unit is U1; The compensating circuit of branch road 2 comprises filter branch FC2 and Thyristor Controlled Reactor branch road TCR2, and control unit is U2 ... The compensating circuit of branch road n comprises filter branch FCn and Thyristor Controlled Reactor branch road TCRn, and control unit is Un.The control signal output ends of control unit U1 is through the switching of contactor CJ11 control Thyristor Controlled Reactor branch road TCR1; A control signal output ends is passed through the switching of contactor CJ12 control filter branch FC1, and another control signal output ends of control unit U1 is through the angle of flow of the thyristor among the circuits for triggering CF1 control Thyristor Controlled Reactor branch road TCR1.The structure of other branch road is identical with branch road 1.What U1-Un used among the present invention is the high-performance fixed point type digital signal processor DSP of American TI Company, and model is TMS320F2812.Thick dashed line among Fig. 1 is represented optical fiber; A plurality of control units are in turn connected into looped network by optical fiber: the optical fiber interface A12 of control unit U1 links to each other through optical fiber with the optical fiber interface A11 of control unit U2; The optical fiber interface A12 of control unit U2 links to each other through optical fiber with the optical fiber interface A11 of control unit U3, and the optical fiber interface A12 of control unit Un links to each other through optical fiber with the optical fiber interface A11 of control unit U1.Main control unit issues control command and gives from control unit, after being finished from control unit, state information is fed back to main control unit, through the information transmission of optical fiber ring network fast and stable, accomplishes the coordination control between the principal and subordinate.During compensation, at first confirm the required idle Q of system
MendNumerical value decreases little gaining rate criterion to wait net
(Net such as what is called decreases little gaining rate criterion; Be meant when the net of each compensation point of power network and decrease little increasing when equating; The reactive compensation capacity of the whole network has the effect that distributes preferably) judge and in the compensation of single branch road, coordinate to select a kind of controlling schemes by way of compensation in compensation or the random back-off in proportion, then carry out next step operation.Three kinds of controls coordinating compensation policy calculate principle or formula following:
1, single branch road compensation: branch road 1 compensator capacity Q
1>=Q
Mend, then branch road 1 drops into, and other branch roads withdraw from.
2, random back-off: Q
1+ Q
2>=Q
Mend, then Q1 and Q2 compensate jointly, and other branch roads withdraw from.
3, coordinate compensation: each branch road compensating proportion K=
* 100% in proportion, then all branch roads are participated in compensation.
What U1-Un used among the present invention is the high-performance fixed point type digital signal processor DSP of American TI Company, and model is TMS320F2812.
Claims (6)
1. multiple branch circuit SVC control method for coordinating; It is characterized in that; Whether it at first normally moves idle demand, electric power system SVC control branch road quantity, compensator capacity, each SVC control branch road distribution distance and each branch road according to electrical network; With etc. net decrease that little gaining rate criterion is judged and in single branch road compensation, coordinate to select in compensation or the random back-off a kind of controlling schemes by way of compensation, clear and definite idle control numerical value in proportion; Then, a selected SVC controls branch road as main control unit, by main control unit acquisition system voltage, current signal in electric power system SVC control branch road; Compare with idle controlled target; The required reactive power numerical value of the system that draws, and, generate compensation scheme according to the compensator capacity of each SVC branch road; Last main control unit with control command be issued to each branch road from control unit, and with the carrying out compensation jointly from control unit and coordinate control command of each branch road.
2. according to the said multiple branch circuit SVC of claim 1 control method for coordinating, it is characterized in that said compensation scheme is following three kinds:
A. the compensation of single branch road: when the required compensator capacity of system is less than or equal to the compensator capacity of a certain branch road wherein, directly issues compensation to this branch road by main control unit and coordinate control command, compensate, other control unit does not participate in compensation;
B. coordinate compensation: each branch road compensating proportion K=
* 100% in proportion; Wherein,
is the required reactive power capacity of system,
be respectively with the compensator capacity of N bar branch road on the section bus;
C. random back-off: compensated jointly by the part branch road of total compensator capacity more than or equal to the required reactive power capacity of system, other branch road withdraws from.
3. according to claim 1 or 2 said multiple branch circuit SVC control method for coordinating; It is characterized in that; In selected main control unit; Also to select time priority control unit, when main control unit takes place when unusual, replace main control unit that each branch road SVC of operate as normal is coordinated control by inferior priority control unit.
4. according to the said multiple branch circuit SVC of claim 3 control method for coordinating; It is characterized in that; Main control unit should in compensation process, judge carry out to coordinate compensating instruction respectively from control unit operation whether normally, when taking place from control unit when unusual, main control unit regenerates compensation scheme.
5. according to the said multiple branch circuit SVC of claim 4 control method for coordinating, it is characterized in that, carry out communication through optical fiber ring network (HW) between each control unit.
6. according to the said multiple branch circuit SVC of claim 5 control method for coordinating; It is characterized in that; Main control unit is selected according to the size order of each control unit address code with time priority control unit; The minimum unit of address code is a main control unit, and the address code second little unit is a time priority control unit.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022515A (en) * | 2013-08-01 | 2014-09-03 | 上海致维电气有限公司 | A reactive compensation cabinet and a control method for reactive compensation units of the reactive compensation cabinet |
| CN104578110A (en) * | 2015-01-15 | 2015-04-29 | 浙江大学 | Reactive compensation control method for distributed reactive compensation system |
| EP2936643A4 (en) * | 2012-12-20 | 2016-09-14 | Abb Technology Ltd | Coordinated control method of generator and svc for improving power plant active power throughput and controller thereof |
| CN106451478A (en) * | 2016-11-18 | 2017-02-22 | 中国电力科学研究院 | Coordinated control method and system used among dynamic reactive power compensating devices |
| CN107659191A (en) * | 2017-10-24 | 2018-02-02 | 保定市尤耐特电气有限公司 | The method for rectifying and device of a kind of power rectifier circuit |
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| JPH02144616A (en) * | 1988-11-25 | 1990-06-04 | Nissin Electric Co Ltd | Cooperative operation control system for reactive power compensating device |
| CN101068082A (en) * | 2007-03-28 | 2007-11-07 | 中国南车集团株洲电力机车研究所 | Comprehensive compensating device and method |
| CN101924370A (en) * | 2010-09-08 | 2010-12-22 | 株洲变流技术国家工程研究中心有限公司 | A kind of mixed type power quality controlling device |
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2012
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Patent Citations (3)
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| JPH02144616A (en) * | 1988-11-25 | 1990-06-04 | Nissin Electric Co Ltd | Cooperative operation control system for reactive power compensating device |
| CN101068082A (en) * | 2007-03-28 | 2007-11-07 | 中国南车集团株洲电力机车研究所 | Comprehensive compensating device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2936643A4 (en) * | 2012-12-20 | 2016-09-14 | Abb Technology Ltd | Coordinated control method of generator and svc for improving power plant active power throughput and controller thereof |
| US9893524B2 (en) | 2012-12-20 | 2018-02-13 | Abb Schweiz Ag | Coordinated control method of generator and SVC for improving power throughput and controller thereof |
| CN104022515A (en) * | 2013-08-01 | 2014-09-03 | 上海致维电气有限公司 | A reactive compensation cabinet and a control method for reactive compensation units of the reactive compensation cabinet |
| CN104022515B (en) * | 2013-08-01 | 2016-03-23 | 上海致维电气有限公司 | Reactive compensation cabinet and the control method of reactive compensation unit |
| CN104578110A (en) * | 2015-01-15 | 2015-04-29 | 浙江大学 | Reactive compensation control method for distributed reactive compensation system |
| CN106451478A (en) * | 2016-11-18 | 2017-02-22 | 中国电力科学研究院 | Coordinated control method and system used among dynamic reactive power compensating devices |
| CN107659191A (en) * | 2017-10-24 | 2018-02-02 | 保定市尤耐特电气有限公司 | The method for rectifying and device of a kind of power rectifier circuit |
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| CN102545241B (en) | 2014-03-26 |
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