CN103280813A - TCSC (thyristor controlled series capacitor) controller for voltage control and control method thereof - Google Patents

TCSC (thyristor controlled series capacitor) controller for voltage control and control method thereof Download PDF

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CN103280813A
CN103280813A CN2013101845551A CN201310184555A CN103280813A CN 103280813 A CN103280813 A CN 103280813A CN 2013101845551 A CN2013101845551 A CN 2013101845551A CN 201310184555 A CN201310184555 A CN 201310184555A CN 103280813 A CN103280813 A CN 103280813A
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CN103280813B (en
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郭春林
杨琳
张非
蒋凌云
张剑
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North China Electric Power University
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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]
    • 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

Abstract

The invention discloses a TCSC (thyristor controlled series capacitor) controller for voltage stable control and a control method thereof. The technical scheme is as follows: the TCSC controller comprises a signal input module, a low-pass filter module, a judging module, a synthesis control module, a coordination module and a signal output module; the signal input module, the low-pass filter module, the judging module, the synthesis control module and the signal output module are sequentially connected with one another; and the signal output module is respectively connected with the synthesis control module and the coordination module. The TCSC controller has the beneficial effects that when the voltage stability problem of an electric power system happens, different control strategies can be adopted for controlling different voltage stability problems, and the voltage stability can be more reasonably improved through the reactive power and the voltage of the coordination compensation system.

Description

Be used for voltage-controlled TCSC controller and control method thereof
Technical field
The invention belongs to the voltage control field, relate in particular to a kind of TCSC controller and control method thereof for Voltage Stability Control.
Background technology
20th century 70, the eighties, a lot of developed countries, the accident of voltage collapse has taken place in succession as France, Sweden, Japan etc., these accidents have brought great inconvenience not only for people's normal life, simultaneously also make electrical network suffer enormous economic loss, therefore the voltage stable problem has also obtained the extensive concern of countries in the world.Along with developing rapidly of China's power industry, the continuous expansion of electrical network scale, electrical network inside exists the factor that causes voltage collapse.The electric power system of China is entering big electrical network, high voltage, big unit and is carrying the epoch at a distance, and the principal character of its electrical network is the national interconnected network that has basically formed based on the remote transferring electricity from the west to the east of big capacity and extensive receiving end electrical network.The interconnected continuous development of electrical network, the load scale enlarges day by day, and the voltage stable problem will be the big important difficult problem that operation of power networks faces.
Voltage stable problem in the electric power system can be divided into transient voltage stable problem and medium-term and long-term voltage stable problem two big classes if divide from the length of time.Wherein, the transient voltage stable problem refers to that system is running into bigger disturbance, during as faults such as short circuit, broken strings, voltage can descend rapidly, this moment (if part) dynamic passive compensation scarce capacity, conventional compensation drops into untimely, will cause cascading failure expansion accident scope; Medium-term and long-term voltage stable problem can be considered together with the static voltage stability problem, when system runs into less disturbance, or load when taking place to change slowly, can not be easy to the system of detecting in the incipient stage whether the voltage destabilization problems can take place, so after disturbance takes place, drop into the possible deterioration that can avoid the voltage stable problem of reactive power compensation at once.
At present, the basic purposes of TCSC is to suppress the angle stability of hyposynchronous resonance of power system (SSR) and raising system, but distribute because the TCSC building-out capacitor can influence system's reactive power, therefore also can be used for improving the voltage stability of electric power system.Though the main effect of TCSC is the angle stability that suppresses hyposynchronous resonance of power system and improve system, in single system, TCSC more can improve the voltage stability of system effectively than SVC.If make TCSC to different voltage stable problems, for example transient voltage is stable stable with medium-term and long-term voltage, take different control strategies, not only can carry out voltage control targetedly, more can effectively utilize the dynamic compensation capacity and avoid causing unnecessary waste.
Summary of the invention
At the problem of mentioning in the background technology that how to effectively utilize the dynamic compensation capacity, a kind of TCSC controller and control method thereof for Voltage Stability Control proposed.
A kind of TCSC controller for Voltage Stability Control is characterized in that, described controller comprises signal input module, low-pass filtering module, judge module, synthetic control module, Coordination module and signal output module;
Wherein, described signal input module, low-pass filtering module, judge module, synthetic control module are connected in turn with signal output module; Described low-pass filtering module is used for the signal of input is carried out low-pass filtering, and with filtered signal input judge module; Described judge module is used for judging the voltage control mode of taking; Described synthetic control module controls according to voltage control mode and synthesized output signal sends to signal output module; Described signal output module is used for that synthetic output signal is carried out outputing to the Coordination module electric power system behind the amplitude limit and carries out voltage compensation;
Described signal output module is connected with Coordination module with synthetic control module respectively; Described Coordination module is used for synthesizing the synthetic output signal of control module and passs static var compensator SVC or flexible AC transmitting system FACTS, is used for the coordination control between flexible AC transmitting system FACTS device.
A kind of control method of the TCSC controller for Voltage Stability Control is characterized in that described method specifically comprises step:
Step 1: from electric power system, obtain input signal; The described input signal that obtains comprises busbar voltage V TWith reference voltage V RefDifference, circuit active power P TWith reference active power P RefDifference or circuit reactive power Q TWith the reference reactive power Q RefDifference;
Step 2: the signal to step 1 input carries out low-pass filtering by low-pass filtering module, eliminates HF noise signal, and sends to judge module;
Step 3: judge module starts corresponding controlling unit according to signal and the first startup value M1 of electric power system setting and the relation between the second startup value M2 that step 2 obtains; The described first startup value M1 is greater than the second startup value M2;
A) during less than M1, synthetic control module starts medium-term and long-term Voltage Stability Control link to the signal value that obtains when step 2 more than or equal to M2;
When b) signal value that obtains when step 2 was more than or equal to M1, synthetic control module started the stable control of transient voltage and medium-term and long-term Voltage Stability Control link simultaneously;
When c) signal value that obtains when step 2 was less than M2, synthetic control module was failure to actuate;
Step 4: synthetic control module takes corresponding control mode to control according to the controlling unit that step 3 starts, and synthesized output signal;
Step 5: signal output module is carried out outputing to behind the amplitude limit according to the synthetic output signal of step 4 and is carried out voltage and reactive power compensation in Coordination module and the electric power system.
In the described step 4, synthetic control module is controlled according to the control mode that step 3 obtains, and the process of synthesized output signal is:
1) when synthetic control module startup transient voltage is stablized controlling unit, adopt the switching control mode to drop into strong benefit capacity, the capacity of mending by force is smaller or equal to the N1% of TCSC installed capacity Xc; Wherein, N1 is first preset proportion;
2) when synthetic control module starts the stable control of transient voltage and medium-term and long-term Voltage Stability Control link simultaneously, adopt switching control mode and ratio control mode to carry out voltage control simultaneously, that is: when dropping into strong benefit capacity, ratio control mode is the input compensation capacity also; Wherein, the strong benefit capacity of switching control mode input is smaller or equal to the N1% of TCSC installed capacity Xc; The compensation capacity that ratio control mode drops into is smaller or equal to the N2% of TCSC installed capacity Xc; N1 is first preset proportion; N2 is second preset proportion;
3) when synthetic control module starts transient voltage and stablize controlling unit, with the strong benefit capacity of input as output signal; When synthetic control module starts the stable control of transient voltage and medium-term and long-term Voltage Stability Control link simultaneously, get maximum MAX, minimum value MIN or the mean value AVE of strong benefit capacity and compensation capacity as output signal.
Described compensation capacity is busbar voltage V TWith reference voltage V RefDifference multiply by medium-term and long-term Voltage Stability Control link gain coefficient.
Described compensation capacity is circuit active power P TWith reference active power P RefDifference multiply by medium-term and long-term Voltage Stability Control link gain coefficient.
Described compensation capacity is the circuit reactive power Q TWith the reference reactive power Q RefDifference multiply by medium-term and long-term Voltage Stability Control link gain coefficient.
The invention has the beneficial effects as follows, when electric power system generation voltage stable problem, can adopt different control strategies to control respectively according to different voltage stable problems, by both idle and voltage of coordination bucking-out system, thereby more reasonably improve voltage stability.
Description of drawings
Fig. 1 is the structural representation of a kind of TCSC controller for Voltage Stability Control provided by the invention;
Fig. 2 is the TCSC controller logic block diagram that is used for different voltage stable problem controls that the present invention proposes;
Fig. 3 is TCSC controller output variable curve chart in the transient voltage stable problem provided by the invention;
Fig. 4 is TCSC controller output variable curve chart in the medium-term and long-term voltage stable problem provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
Fig. 1 is the structural representation of a kind of TCSC controller for Voltage Stability Control provided by the invention.Described controller comprises signal input module, low-pass filtering module, judge module, synthetic control module, Coordination module and signal output module;
Wherein, described signal input module, low-pass filtering module, judge module, synthetic control module are connected in turn with signal output module; Described low-pass filtering module is used for the signal of input is carried out low-pass filtering, and with filtered signal input judge module; Described judge module is used for judging the voltage control mode of taking; Described synthetic control module controls according to voltage control mode and synthesized output signal sends to signal output module; Described signal output module is used for that synthetic output signal is carried out outputing to Coordination module behind the amplitude limit and voltage and reactive power compensation is carried out in electric power system;
Described signal output module is connected with Coordination module with synthetic control module respectively; Described Coordination module is used for synthesizing the synthetic output signal of control module and passs static var compensator SVC or other flexible AC transmitting system FACTS, is used for the coordination control between flexible AC transmitting system FACTS device.
Fig. 2 is the TCSC controller logic block diagram that is used for different voltage stable problem controls that the present invention proposes.Among Fig. 2, shown TCSC controller logic block diagram, the signal M of input is through entering into the judgement link after the low-pass filtering.Above one the tunnel be that transient voltage is stablized controlling unit, be to adopt switching control to drop into strong benefit capacity X1=const, mend by force, be busbar voltage V with the input signal TWith reference voltage V RefDifference be example, the condition of startup can adopt V Ref-V T〉=A(A for example is 0.1p.u.), this process is at strong a period of time T that mends fThe back is withdrawed from slope control form, and K1 is the gain coefficient that transient voltage is stablized controlling unit.Below one the tunnel be medium-term and long-term Voltage Stability Control link, can adopt for example voltage difference proportional control X2=K2* (V Ref-V T), this link entry condition for example is V Ref-V T0, K2 is the gain coefficient of medium-term and long-term Voltage Stability Control link.
After the stable control of transient voltage and/or the action of medium-term and long-term Voltage Stability Control, after resulting reactance value X got maximum, process amplitude limit link finally is input to carried out voltage and reactive power compensation in Coordination module and the electric power system.The TCSC controller design logic of associative list 1 can have better the present invention to be understood.
Table 1TCSC controller design logic
Figure BDA00003206381700071
Fig. 3 is TCSC controller output variable curve chart in the transient voltage stable problem provided by the invention.Fig. 3 shows TCSC controller output variable curve chart in the transient voltage stable problem.When system's generation transient voltage stable problem, voltage descends rapidly, reaches entry condition V Ref-V T 〉=0.1 the time this link control, but simultaneously medium-term and long-term Voltage Stability Control link has also reached entry condition V Ref-V T0, so two kinds of controls this moment all can start.If the maximum compensation capacity Xc of TCSC is 0.018p.u., the strong benefit capacity that transient voltage is stablized controlling unit is X1=30%Xc, is 0.0054p.u., and amplitude limit is 50%Xc; The compensation capacity of medium-term and long-term Voltage Stability Control link output is X2=K2* (V Ref-V T), K2 is 0.1, and amplitude limit is 20%Xc.
Fig. 4 is TCSC controller output variable curve chart in the medium-term and long-term voltage stable problem provided by the invention.Fig. 4 shows TCSC controller output variable curve chart in the medium-term and long-term voltage stable problem.When medium-term and long-term voltage stable problem took place in system, change in voltage originally was unconspicuous, but can cause the voltage collapse accident from now on for avoiding, and still need drop into reactive compensation capacity and carry out voltage and support.This link entry condition is V Ref-V T0, transient voltage was stablized controlling unit and was not reached entry condition this moment.Fig. 4 shows TCSC controller output variable curve chart in the medium-term and long-term voltage stable problem.This moment, controller only carried out voltage difference proportional control, X=K2* (V Ref-V T), K2 is 0.1.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (6)

1. a TCSC controller that is used for Voltage Stability Control is characterized in that, described controller comprises signal input module, low-pass filtering module, judge module, synthetic control module, Coordination module and signal output module;
Wherein, described signal input module, low-pass filtering module, judge module, synthetic control module are connected in turn with signal output module; Described low-pass filtering module is used for the signal of input is carried out low-pass filtering, and with filtered signal input judge module; Described judge module is used for judging the voltage control mode of taking; Described synthetic control module controls according to voltage control mode and synthesized output signal sends to signal output module; Described signal output module is used for synthetic output signal is carried out outputing to behind the amplitude limit Coordination module and electric power system with bucking voltage;
Described signal output module is connected with Coordination module with synthetic control module respectively; Described Coordination module is used for synthesizing the synthetic output signal of control module and passs static var compensator SVC or flexible AC transmitting system FACTS, is used for the coordination control between flexible AC transmitting system FACTS device.
2. control method that is used for the TCSC controller of Voltage Stability Control is characterized in that described method specifically comprises step:
Step 1: from electric power system, obtain input signal; The described input signal that obtains comprises busbar voltage V TWith reference voltage V RefDifference, circuit active power P TWith reference active power P RefDifference or circuit reactive power Q TWith the reference reactive power Q RefDifference;
Step 2: the signal to step 1 input carries out low-pass filtering by low-pass filtering module, eliminates HF noise signal, and sends to judge module;
Step 3: judge module starts corresponding controlling unit according to signal and the first startup value M1 of electric power system setting and the relation between the second startup value M2 that step 2 obtains; The described first startup value M1 is greater than the second startup value M2;
A) during less than M1, synthetic control module starts medium-term and long-term Voltage Stability Control link to the signal value that obtains when step 2 more than or equal to M2;
When b) signal value that obtains when step 2 was more than or equal to M1, synthetic control module started the stable control of transient voltage and medium-term and long-term Voltage Stability Control link simultaneously;
When c) signal value that obtains when step 2 was less than M2, synthetic control module was failure to actuate;
Step 4: synthetic control module takes corresponding control mode to control according to the controlling unit that step 3 starts, and synthesized output signal;
Step 5: signal output module carry out amplitude limit according to the synthetic output signal of step 4 and output to Coordination module and electric power system in carry out voltage and reactive power compensation.
3. method according to claim 2 is characterized in that, in the described step 4, synthetic control module is controlled according to the control mode that step 3 obtains, and the process of synthesized output signal is:
1) when synthetic control module startup transient voltage is stablized controlling unit, adopt the switching control mode to drop into strong benefit capacity, the capacity of mending by force is smaller or equal to the N1% of TCSC installed capacity Xc; Wherein, N1 is first preset proportion;
2) when synthetic control module starts the stable control of transient voltage and medium-term and long-term Voltage Stability Control link simultaneously, adopt switching control mode and ratio control mode to carry out voltage control simultaneously, that is: when adopting the switching control mode to drop into strong benefit capacity, ratio control mode is the input compensation capacity also; Wherein, the strong benefit capacity of switching control mode input is smaller or equal to the N1% of TCSC installed capacity Xc; The compensation capacity that ratio control mode drops into is smaller or equal to the N2% of TCSC installed capacity Xc; N1 is first preset proportion; N2 is second preset proportion;
3) when synthetic control module starts transient voltage and stablize controlling unit, with the strong benefit capacity of input as output signal; When synthetic control module starts the stable control of transient voltage and medium-term and long-term Voltage Stability Control link simultaneously, get maximum MAX, minimum value MIN or the mean value AVE of strong benefit capacity and compensation capacity as output signal.
4. method according to claim 3 is characterized in that, described compensation capacity is busbar voltage V TWith reference voltage V RefDifference multiply by medium-term and long-term Voltage Stability Control link gain coefficient.
5. method according to claim 3 is characterized in that, described compensation capacity is circuit active power P TWith reference active power P RefDifference multiply by medium-term and long-term Voltage Stability Control link gain coefficient.
6. method according to claim 3 is characterized in that, described compensation capacity is the circuit reactive power Q TWith the reference reactive power Q RefDifference multiply by medium-term and long-term Voltage Stability Control link gain coefficient.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004055989A2 (en) * 2002-12-13 2004-07-01 Koninklijke Philips Electronics N.V. Low lock time delay locked loops using time cycle supppressor
CN102025163A (en) * 2010-12-25 2011-04-20 广东明阳龙源电力电子有限公司 Adjusting method for dynamic reactive compensation controller
CN102832629A (en) * 2012-08-31 2012-12-19 天津理工大学 TCSC (thyristor controlled series compensator) and SVC (static var compensator) joint debugging control system and working method based on saddle node bifurcation theory

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004055989A2 (en) * 2002-12-13 2004-07-01 Koninklijke Philips Electronics N.V. Low lock time delay locked loops using time cycle supppressor
CN102025163A (en) * 2010-12-25 2011-04-20 广东明阳龙源电力电子有限公司 Adjusting method for dynamic reactive compensation controller
CN102832629A (en) * 2012-08-31 2012-12-19 天津理工大学 TCSC (thyristor controlled series compensator) and SVC (static var compensator) joint debugging control system and working method based on saddle node bifurcation theory

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