CN106329541A - Parallel operation SVC coordinated control system based on voltage adjusting rate - Google Patents
Parallel operation SVC coordinated control system based on voltage adjusting rate Download PDFInfo
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- CN106329541A CN106329541A CN201510389238.2A CN201510389238A CN106329541A CN 106329541 A CN106329541 A CN 106329541A CN 201510389238 A CN201510389238 A CN 201510389238A CN 106329541 A CN106329541 A CN 106329541A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a parallel operation SVC coordinated control system based on voltage adjusting rate. The system comprises a plurality of parallelly operated SVC reactive power compensation devices (SVC1, SVC2 ... SVCn), each of which is mounted on a main generator bus of a wind power plant and each comprises an SVC primary device (W1) and a control system (W2). The SVC primary devices (W1) are mounted to the 35kV side, and the control systems (W2) are mounted to the 220kV bus side. The method utilized and applied by the system comprises the steps: (1) detecting whether a coordination control system is running normally according to the data acquisition and analysis of the current grid condition and the status data of each parallel running branch SVC reactive power compensation device, and when the coordination control system is determined to run normally, a coordination control scheme is made, and reactive power compensation tasks are assigned to each SVC reactive power compensation device. According to the tasks, each SVC reactive power compensation device completes its own task to cooperated and complete the power grid requirements. The system can prevent the parallel running devices from falling into a chaotic situation after the coordination control drops out.
Description
Technical field
The application relates to a kind of a kind of based on voltage permanent speed regulation paired running SVC coordinated control system being applicable to the cooperation control between the same multiple SVC device of section bus of the wind energy turbine set paired running.
Background technology
Along with the fast development of clean energy resource, the extensive concentration of wind-powered electricity generation is accessed the electrical network higher requirement of proposition.In the case of adverse circumstances or operation constraints increase, the problems such as line voltage, three-phase imbalance, current distortion and power factor are on the low side can loom large, and the level of security of wind energy turbine set can reduce step by step.In flexible AC control device, SVC is most widely used general, the most ripe idle and voltage control apparatus in electrical network, can quick compensating reactive power and maintenance line voltage.
SVC controls technology huge number at present, uses BK method to solve Time Delay present in compensation device response process；Use modified tone rate to achieve compensation device reduce the effect of Control of Voltage deviation and device compensation range is provided；Using wide area Coordinated Control, it is achieved that each node voltage amplitude arranged side by side and the real-time measurement of phase place, the supervision for online busbar voltage situation and change thereof provides technology guarantee.Voltage coordinated control system between intensive wind energy turbine set paired running Reactive Power Device just has at application functions such as phase of line, voltage analysis and on-line coordination control aid decisions.
After wind energy turbine set voltage tuning controller puts into operation, temporarily solving on-Line Voltage Harmonic Control, once tuning controller parallel operation device out of service will sink into trouble waters.Voltage Stability Analysis function based on coordinated control system, owing to being strongly depend on tuning controller and communication network, might not can guarantee that and be widely used in voltage stabilization and control as expection.Therefore, study and a kind of be applicable to the control system that paired running SVC exits at tuning controller and be particularly important.
Summary of the invention
The purpose of the application is to provide one and overcomes wind energy turbine set voltage tuning controller fault and deficiency, proposes a kind of paired running SVC coordinated control system based on voltage permanent speed regulation, it is to avoid coordinate to control out of service after, parallel operation device falls into chaos situation.
The purpose of the application is achieved in that paired running SVC coordinated control system based on voltage permanent speed regulation, it includes the SVC reactive power compensator (SVC 1, SVC2 ... SVCn) of multiple paired running, each SVC reactive power compensator is articulated on wind energy turbine set main transformer bus, each SVC reactive power compensator is all made up of SVC primary equipment (W1) and control system (W2), wherein W1 hangs over 35kV side, and W2 is connected in 220kV bus bar side.
The application of a kind of paired running SVC coordinated control system based on voltage permanent speed regulation, comprises the following steps:
T1: the work state information of system acquisition current electric grid demand status and each SVC arranged side by side is analyzed；
T2: judge that each coordinated control system unit the most normally works, causes with or without communication failure coordinated control system unit to exit；
T21: coordinated control system unit normally works, receives current information；
T22: coordinated control system unit exits, enters voltage difference coefficient and adjusts unit, carry out difference coefficient and adjust, select rational difference coefficient；
T31: coordinated control system unit is formulated and is reasonably coordinated to control idle allocative decision；
T32: each paired running SVC reactive current value I obtained according to rational difference coefficientQ1、 IQ2…IQn, arrange by the distribution ratio of reactive current IQ and determine that the idle of each SVC is exerted oneself, formulate rational idle allocative decision；
T4: flip-flop circuit receives SVC idle control device and instructs without the distribution of work, and the angle of flow triggering the IGCT in TCR makes each branch road arranged side by side send the most idle；
T5: judge whether reactive-load compensation meets the demand of electrical network.
Owing to implementing technique scheme, a kind of paired running SVC coordinated control system based on voltage permanent speed regulation, the method used is first according to current grid condition and the state data acquisition analysis of each paired running branch road SVC reactive power compensator, then detection coordinated control system is the most properly functioning, when confirming that coordinated control system all goes well, formulate Coordinated Control Scheme, distribute to each SVC reactive power compensator reactive-load compensation task, complete each to exert oneself task according to order SVC reactive power compensator, worked in coordination with grid requirements.
When detecting that coordinated control system is abnormal, communication failure occur or be out of service, paired running SVC reactive power compensator will sink into troubled waters, and the Voltage-stabilizing Problems of wind energy turbine set will face a severe test.Add at this and adjust poor link of adjusting, just can change the reactive current of each paired running SVC reactive power compensator by changing difference coefficient.Select rational bar difference coefficient, more just can realize the idle reasonable distribution between SVC reactive power compensator arranged side by side according to the allocation proportion of reactive current.
The application can avoid coordinating controlling out of service after, parallel operation device falls into chaos situation.
Accompanying drawing illustrates: the concrete structure of the application is given by following drawings and Examples:
Fig. 1 is paired running SVC coordinated control system structure chart based on voltage permanent speed regulation；
Fig. 2 is that the additional difference coefficient SVC after link that adjusts determines Control of Voltage transfer function model；
Fig. 3 is control system FB(flow block)；
In figure, label is: T is wind energy turbine set main transformer；W1 and W2 is respectively primary equipment and the control system of SVC1；U1, U2 ... Un is coordinated control system unit；C1, C2 ... Cn is that voltage difference coefficient is adjusted unit；S1, S2 ... Sn is that SVC controls device；J1, J2 ... Jn is flip-flop circuit；FC1, FC2 ... FCn is filter branch (Filter)；TCR1, TCR2 ... TCRn is Thyristor Controlled Reactor branch road (Thyristor Controlled Reactor).
Detailed description of the invention:
The application is not limited by following embodiment, can determine specific embodiment according to the technical scheme of the application and practical situation.
Embodiment: paired running SVC coordinated control system based on voltage permanent speed regulation includes the SVC reactive power compensator (SVC 1, SVC2 ... SVCn) of multiple paired running, each SVC reactive power compensator is articulated on wind energy turbine set main transformer bus, each SVC reactive power compensator is all made up of SVC primary equipment (W1) and control system (W2), wherein W1 hangs over 35kV side, and W2 is connected in 220kV bus bar side.
As a example by branch road SVC 1, SVC primary equipment (W1) is made up of filter branch (FC1) and Thyristor Controlled Reactor branch road (TCR1), and control system (W2) includes that adjust unit (C1), SVC of coordinated control system unit (U1), voltage difference coefficient controls device (S1) and flip-flop circuit (T1) four part.
Other branch road is identical with branch road SVC 1 structure.
U1 Un in the application, S1 Sn, T1 Tn use the control device of invention in Chinese patent " a kind of multiple branch circuit SVC control method " (patent No. 201210025216.4).Control system (W2) uses the floating point number signal processor DSP of American TI Company high-performance low-power-consumption, and its model is TMS320F28335.
When the work of SVC reactive power compensator is mended idle, it should first determine that the reactive capability Q that system needs mends, i.e. gather the situation of current electric grid.
1, the grid side information gathered according to control system, coordinated control system unit (failure free operation) output order mends idle to system to SVC reactive power compensator, the angle of flow controlling the IGCT in Thyristor Controlled Reactor branch road TCR to flip-flop circuit instruction by SVC reactive power compensator.
2, it is switched to voltage difference coefficient adjust unit C1, C2 when coordinated control system unit breaks down and exits ... Cn,
According to the principle of reactive difference adjustment device, the additional permanent speed regulation of SVC reactive power compensator public calculating formula of adjusting is as follows:
UG = UR — IQ·Kc
URSVC reactive power compensator voltage on the basis of SVC reactive power compensator rated voltage gives per unit value, UGSVC reactive power compensator voltage per unit value on the basis of SVC reactive power compensator rated voltage, IQ SVC reactive power compensator reactive current per unit value on the basis of SVC reactive power compensator rated current, the Kc additional permanent speed regulation on the basis of SVC reactive power compensator rated capacity.
If Fig. 2 is the additional tune difference SVC voltage controller being adjusted according to voltage deviation amount, UrefFor electrical network reference voltage；UfFeedback voltage i.e. electrical network actual measurement voltage；PID(Proportion
Integration differentiation) it is that PID link is according to UrefAnd UfVoltage deviation amount Δ U is adjusted controlling.What difference coefficient Kc value reflected is the slope of SVC reactive power compensator external characteristic curve, i.e. superposition reflection reactive current I on actual measurement magnitude of voltageQThe additional amount of size.The so deviation of actuator such as formula:
Δ U=Δ U ＇-Kc*IQ
The i.e. droop control of above formula controls, and just adjusts poor and negative tune poor according to positive and negative can being divided into of Kc coefficient, is referred to as just adjusting difference when external characteristic curve is downward-sloping, and the referred to as negative tune that is inclined upwardly is poor.Just can be according to SVC reactive power compensator compensating reactive power electric current I by changing Kc valueQAllocation proportion determine the idle reasonable distribution between each parallel operation device, it is to avoid disturbance causes wild effect.
Each paired running SVC reactive power compensator reactive current value I obtained according to rational difference coefficientQ1、 IQ2…IQn, then accounted for, by each branch road reactive current, reactive current I that system is totalQRatio row determine that distributing each the idle of SVC reactive power compensator exerts oneself, formulate rational idle allocative decision:
, wherein Q mends the total reactive capability needed for electrical network, and Qn is the reactive compensation capacity of the n-th SVC distribution.
Seeing accompanying drawing 3, it is as follows that the application of a kind of paired running SVC coordinated control system based on voltage permanent speed regulation realizes step:
The work state information of T1: system acquisition current electric grid demand status and each SVC reactive power compensator arranged side by side is analyzed.
T2: judge that each coordinated control system unit the most normally works, causes with or without communication failure coordinated control system unit to exit；
T21: coordinated control system unit normally works, receives current information；
T22: coordinated control system unit exits, enters voltage difference coefficient and adjusts unit, adjust as accompanying drawing 3 carries out difference coefficient, select rational difference coefficient；
T31: coordinated control system unit is formulated and is reasonably coordinated to control idle allocative decision；
T32: each paired running SVC reactive power compensator reactive current value I obtained according to rational difference coefficientQ1、 IQ2…IQn, arrange by the distribution ratio of reactive current IQ and determine that each the idle of SVC reactive power compensator is exerted oneself, formulate rational idle allocative decision；
T4: flip-flop circuit receives SVC reactive power compensator and instructs without the distribution of work, and the angle of flow triggering the IGCT in TCR makes each branch road arranged side by side send the most idle；
T5: judge whether reactive-load compensation meets the demand of electrical network.
Above technical characteristic constitutes the most preferred embodiment of the application, and it has stronger adaptability and optimal implementation result, can increase and decrease inessential technical characteristic according to actual needs, meet the needs of different situations.
Claims (6)
1. a paired running SVC coordinated control system based on voltage permanent speed regulation, it is characterized in that: it includes the SVC reactive power compensator (SVC 1, SVC2 ... SVCn) of multiple paired running, each SVC reactive power compensator is articulated on wind energy turbine set main transformer bus, each SVC reactive power compensator is all made up of SVC primary equipment (W1) and control system (W2), wherein W1 hangs over 35kV side, and W2 is connected in 220kV bus bar side.
2. paired running SVC coordinated control system based on voltage permanent speed regulation as claimed in claim 1, it is characterized in that: SVC primary equipment (W1) is made up of filter branch (FC1) and Thyristor Controlled Reactor branch road (TCR1), control system (W2) includes that adjust unit (C1), SVC of coordinated control system unit (U1), voltage difference coefficient controls device (S1) and flip-flop circuit (T1) four part.
3. the application of a paired running SVC coordinated control system based on voltage permanent speed regulation, it is characterised in that: it comprises the following steps: T1: the work state information of system acquisition current electric grid demand status and each SVC arranged side by side is analyzed；
T2: judge that each coordinated control system unit the most normally works, causes with or without communication failure coordinated control system unit to exit；
T21: coordinated control system unit normally works, receives current information；
T22: coordinated control system unit exits, enters voltage difference coefficient and adjusts unit, carry out difference coefficient and adjust, select rational difference coefficient；
T31: coordinated control system unit is formulated and is reasonably coordinated to control idle allocative decision；
T32: each paired running SVC reactive current value I obtained according to rational difference coefficientQ1、 IQ2…IQn, arrange by the distribution ratio of reactive current IQ and determine that the idle of each SVC is exerted oneself, formulate rational idle allocative decision；
T4: flip-flop circuit receives SVC idle control device and instructs without the distribution of work, and the angle of flow triggering the IGCT in TCR makes each branch road arranged side by side send the most idle；
T5: judge whether reactive-load compensation meets the demand of electrical network.
4. the application of paired running SVC coordinated control system based on voltage permanent speed regulation as claimed in claim 3, it is characterized in that: the grid side information gathered according to control system in step T1-T21, coordinated control system unit output order mends idle to system to SVC reactive power compensator, the angle of flow controlling the IGCT in Thyristor Controlled Reactor branch road TCR to flip-flop circuit instruction by SVC reactive power compensator.
5. the application of paired running SVC coordinated control system based on voltage permanent speed regulation as claimed in claim 3, it is characterised in that: step T22 is switched to when coordinated control system unit breaks down and exits voltage difference coefficient and adjusts unit C1, C2 ... Cn.
6. the application of paired running SVC coordinated control system based on voltage permanent speed regulation as claimed in claim 3, it is characterised in that: each paired running SVC reactive power compensator reactive current value I being worth to according to difference coefficient Kc in step T32Q1、 IQ2…IQn, then accounted for, by each branch road reactive current, reactive current I that system is totalQRatio row determine that distributing each the idle of SVC reactive power compensator exerts oneself.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069769A (en) * | 2017-06-01 | 2017-08-18 | 华北电力科学研究院有限责任公司 | Test the method and system of the access stability of dynamic reactive compensation device |
| CN111082433A (en) * | 2019-12-04 | 2020-04-28 | 中国电力科学研究院有限公司 | Inverter reactive current priority distribution method and system under voltage disturbance |
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- 2015-07-06 CN CN201510389238.2A patent/CN106329541A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069769A (en) * | 2017-06-01 | 2017-08-18 | 华北电力科学研究院有限责任公司 | Test the method and system of the access stability of dynamic reactive compensation device |
| CN107069769B (en) * | 2017-06-01 | 2020-02-18 | 华北电力科学研究院有限责任公司 | Method and system for testing access stability of dynamic reactive power compensation device |
| CN111082433A (en) * | 2019-12-04 | 2020-04-28 | 中国电力科学研究院有限公司 | Inverter reactive current priority distribution method and system under voltage disturbance |
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