CN101277017A - Method for regulating static reactive compensator of power transmission system - Google Patents
Method for regulating static reactive compensator of power transmission system Download PDFInfo
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- CN101277017A CN101277017A CNA2008100574867A CN200810057486A CN101277017A CN 101277017 A CN101277017 A CN 101277017A CN A2008100574867 A CNA2008100574867 A CN A2008100574867A CN 200810057486 A CN200810057486 A CN 200810057486A CN 101277017 A CN101277017 A CN 101277017A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 59
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 19
- 230000003068 static effect Effects 0.000 title claims abstract description 15
- 230000010355 oscillation Effects 0.000 claims abstract description 20
- 238000011217 control strategy Methods 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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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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- 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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Abstract
The present invention relates to an application of the static reactive compensator, concretely presents a method for regulating the static reactive compensator used by the power transmission system. The method comprises the following procedures: regulating the reactive power output Q0 of the TCR branch line according the current operation voltage of the power transmission system, regulating the reactive power output delta Q of the TCR branch line according to the signal reflecting the oscillating mode of the power transmission system, inputting the total reactive power outputting signal which is obtained after the overlapping of the reactive power output Q0 and the reactive power output delta Q into a trigger pulse circuit, and realizing the regulation to the SVC through the regulation to the trigger pulse circuit. The method according to the invention realizes the combination control and regulation to the stable reactive voltage and static stability of the power transmission system, and reduces the interrelationship caused by the combination SVC control and regulation by the traditional voltage regulation strategy and auxiliary control strategy. Not only that the stable voltage of the power transmission system and the reactive power output are in the qualified operation range is realized, but also the power oscillation of the power transmission system is effectively inhibited.
Description
Technical field
The present invention relates to reactive power compensation technology in parallel, be specifically related to control method static reactive compensator of power transmission system.
Background technology
In transmission system, adopt reactive power compensation technology in parallel not only to improve voltage and support, the voltage of control transmission system operates in the suitable scope, regulates by realizing dynamic reactive power, thereby the power oscillation that suppresses transmission system, and the dynamic stability of raising transmission system.
SVC (Static Var Compensator) is a kind of parallel connection type static reacance power generator or absorber, realize adjustable reactive power output by regulating and controlling to SVC, thereby the power oscillation that suppresses transmission system, the voltage that improves transmission system is stable, guarantees that transmission system safely and steadily runs.
As shown in Figure 1, SVC comprises TCR branch road and LC filter branch, wherein the TCR branch road comprises, thyristor valve and reactor, the two is connected in parallel, SVC can also comprise the low press fit Shunt Capacitor Unit and the reactor group of mechanical switch switching, and the triggering phase angle of the thyristor valve by control TCR branch road is regulated reactive power output.
General at present employing voltage regulator is finished the regulating and controlling to SVC, and described voltage regulator adopts decides voltage control mode, and its key link is a first order inertial loop, and its inertia time constant is usually between 20ms-150ms.
Described voltage regulator specifically is work like this: the voltage signal that measures is compared with voltage reference signal, quick adjustment by voltage regulator, make error reduce, finally reach the indifference of voltage reference signal is regulated, the reactive power signals Q of voltage regulator output subsequently is sent to triggering pulse generator, regulates reactive power output by the triggering phase angle of control thyristor valve.
At present in the general regulating and controlling method to SVC, can increase by a pilot controller and carry out voltage-regulation and improve power system dynamic stability with this before voltage regulator, described assist control implement body is to work like this:
Input can reflect the signal of system oscillation pattern, after the links such as input signal process ratio, phase shift, obtains an output signal relevant with the system oscillation pattern, and variation of output signals should be able to play the positive damping effect to the oscillation mode of system.
The output signal of pilot controller is superimposed upon on the input signal of voltage regulator, thereby realization obtains reactive power output to the regulating and controlling of SVC.
But, in the at present general SVC regulating and controlling method, the control time-delay of voltage regulator can influence the response speed of pilot controller, and general employing of voltage regulator decided voltage control mode, in the dynamic process of system's electromechanical oscillations, this control mode can weaken the effect that pilot controller suppresses power system dynamic stability, because influencing each other between two adjusters is bigger, makes the control performance big heavy discount of SVC to transmission system.
Summary of the invention
The objective of the invention is to propose a kind of control method of static reactive compensator of power transmission system, being used for overcoming voltage regulator that prior art exists and pilot controller unites when SVC carried out regulating and controlling, influence is bigger each other, is unfavorable for realizing simultaneously controlling the stable state reactive voltage of transmission system and the problem that dynamic stability improves.
In order to realize the foregoing invention purpose, the present invention specifically is achieved in that
A kind of control method of static reactive compensator of power transmission system comprises the steps:
Connect in the above-mentioned scheme, in the described control method, described step 1 specifically is achieved in that
Described step 1 specifically is achieved in that
Step 11 is calculated the average working voltage of transmission system in some cycles;
Step 12 judges whether average working voltage exceeds the acceptability limit of the voltage of needs control, if surpass, then calculates the difference of average working voltage and the acceptability limit of the voltage that needs control;
Step 13 is determined stable state reactive power output valve according to the relation between the reactive power output valve of voltage difference that obtains and transmission system;
Step 14, the reactive power output of regulating the reactive power compensation branch road reaches described stable state reactive power output valve, obtains the reactive power output Q of TCR branch road simultaneously
0
Connect above-mentioned scheme, in the described control method, described reactive power compensation branch road comprises, the fixing idle branch road of TCR branch road and transmission system;
Described fixing idle branch road comprises LC filter branch, low pressure reactance arm in parallel or low-voltage capacitance branch road in parallel at least.
Connect above-mentioned scheme, in the described control method, the signal of the reflection transmission system oscillation mode in the described step 2 is to obtain by the instantaneous power of calculating transmission system and the difference of power controlled target;
Described instantaneous power is a Millisecond.
Connect above-mentioned scheme, in the described control method, the signal of described reflection transmission system oscillation mode is obtained successively the reactive power output Δ Q of TCR branch road every the processing of straight link, control phase link and proportional component by control.
Adopt the present invention with stable state reactive power and dynamic stability control difference independent design, with the reactive power output signal stack of adopting two control strategies to obtain, realized the adjusting that jointly controls to the stable state reactive voltage of transmission system and dynamic stability, reduce jointly controlling of traditional voltage-regulation strategy and assist control strategy and regulate influencing each other that SVC causes, both realized that the output of transmission system steady state voltage and reactive power in qualified range of operation, effectively suppressed the transmission system power oscillation again.
Description of drawings
Fig. 1 is the structural representation of SVC;
Fig. 2 is SVC Principles of Regulation figure in the prior art;
The schematic diagram of Fig. 3 for adopting the inventive method that SVC is regulated;
Fig. 4 is the theory diagram that calculates the reactive power output valve of TCR branch road in the specific embodiment of the invention;
Fig. 5 is for realizing the process chart of the embodiment of the invention.
Embodiment
Be described in detail below in conjunction with accompanying drawing and specific embodiments of the invention.
Embodiment of the present invention specifically comprises the steps:
Described step 1 specifically comprises:
Step 11 is calculated transmission system than the average working voltage that (for example is provided with 20 minutes) in the long periods of time in order;
Step 12 judges whether average working voltage exceeds the acceptability limit of the voltage of needs control, if surpass, then calculate the voltage difference of average working voltage and the acceptability limit of the voltage that needs control, otherwise flow process finishes;
Step 13 is determined stable state reactive power output valve according to the relation between the reactive power output valve of voltage difference that obtains and transmission system;
Step 14, the reactive power output of regulating the reactive power compensation branch road reaches described stable state reactive power output valve, obtains the reactive power output Q of TCR branch road simultaneously
0
In the described step 13, when voltage difference greater than 0 the time, increase the lagging reactive power output valve of parallel branch, perhaps reduce the capacitive reactive power output valve of parallel branch, to realize adjusting to transmission system stable state reactive power;
When voltage partially value increase the capacitive reactive power output valve of parallel branch less than 0 the time, perhaps increase the capacitive reactive power output valve of parallel branch, to realize adjusting to transmission system stable state reactive power.
Described reactive power compensation branch road comprises, the fixing idle branch road of TCR branch road and transmission system;
Described fixing idle branch road comprises LC filter branch, low pressure reactance arm in parallel or low-voltage capacitance branch road in parallel at least.
At a stable state reactive voltage conditioning period, the reactive power of TCR branch road output Q
0Remain unchanged.
Can provide a positive damping effect to the fluctuation of reflection transmission system oscillation mode signal by transmission system being stablized control, realize suppressing the system power vibration, improve the dynamic stability of system.
In the described step 2, the signal of described reflection transmission system oscillation mode after handling, links such as straight, ratio, phase shift is obtained successively the reactive power output Δ Q of TCR branch road through control.
As shown in Figure 4, adopt the instantaneous power P of transmission system
L(Millisecond) and power controlled target P
L0Between difference as the signal of reflection transmission system oscillation mode, then successively through control every straight link 2, control phase link 3 and 4 and proportional component 5 handle, obtain the reactive power output Δ Q of TCR branch road.
Adopt the oscillation mode of reactive power signals reflection transmission system, the variation of Δ Q should be able to play the positive damping effect to the oscillation mode of system, and the response change of Δ Q is a Millisecond.
Claims (5)
1, a kind of control method of static reactive compensator of power transmission system is characterized in that, comprises the steps:
Step 1 according to the current working voltage of transmission system, obtains the reactive power output Q of TCR branch road
0
Step 2 starts the signal according to reflection transmission system oscillation mode, obtains the reactive power output Δ Q of TCR branch road;
Step 3 is with described reactive power output Q
0With obtain total reactive power output signal after the reactive power output Δ Q addition and be sent to triggering pulse generator, the triggering phase angle of the thyristor valve of trigger impulse circuit is regulated.
2, the control method of static reactive compensator of power transmission system as claimed in claim 1 is characterized in that,
Described step 1 specifically is achieved in that
Step 11 is calculated the average working voltage of transmission system in some cycles;
Step 12 judges whether average working voltage exceeds the acceptability limit of the voltage of needs control, if surpass, then calculates the difference of average working voltage and the acceptability limit of the voltage that needs control;
Step 13 is determined stable state reactive power output valve according to the relation between the reactive power output valve of voltage difference that obtains and transmission system;
Step 14, the reactive power output of regulating the reactive power compensation branch road reaches described stable state reactive power output valve, obtains the reactive power output Q of TCR branch road simultaneously
0
3, the control method of static reactive compensator of power transmission system as claimed in claim 2 is characterized in that:
Described reactive power compensation branch road comprises, the fixing idle branch road of TCR branch road and transmission system;
Described fixing idle branch road comprises LC filter branch, low pressure reactance arm in parallel or low-voltage capacitance branch road in parallel at least.
4, the control method of static reactive compensator of power transmission system as claimed in claim 1 is characterized in that:
The signal of the reflection transmission system oscillation mode in the described step 2 is to obtain by the instantaneous power of calculating transmission system and the difference of power controlled target;
Described instantaneous power is a Millisecond.
5, as the control method of claim 1 or 4 described static reactive compensator of power transmission system, it is characterized in that:
The signal of described reflection transmission system oscillation mode is obtained successively the reactive power output Δ Q of TCR branch road every the processing of straight link, control phase link and proportional component by control.
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| CN2008100574867A CN101277017B (en) | 2008-02-02 | 2008-02-02 | Method for regulating static reactive compensator of power transmission system |
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| CN2008100574867A CN101277017B (en) | 2008-02-02 | 2008-02-02 | Method for regulating static reactive compensator of power transmission system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118031A (en) * | 2010-12-25 | 2011-07-06 | 广东明阳龙源电力电子有限公司 | Method for calculating instantaneous reactive power of power system based on vector recognition and SVC (static var compensator) compensation device |
| CN104333003A (en) * | 2014-10-28 | 2015-02-04 | 国网辽宁省电力有限公司朝阳供电公司 | Harmonic control method for photovoltaic power generation system |
| CN106549388A (en) * | 2015-09-18 | 2017-03-29 | 国家电网公司 | A kind of distributed SVC Control protection systems |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1010822B (en) * | 1987-01-05 | 1990-12-12 | 电子工业部工艺研究所 | Single chip microprocessor wattless power controller |
| US6573691B2 (en) * | 2001-10-17 | 2003-06-03 | Hatch Associates Ltd. | Control system and method for voltage stabilization in electric power system |
| CN1787323A (en) * | 2004-12-10 | 2006-06-14 | 广东工业大学 | Voltage inserting type controlling method for static reactive compensater of electricity distributing system |
| CN2882076Y (en) * | 2006-02-24 | 2007-03-21 | 清华大学 | Static sync compensator based on crystal brake tube |
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2008
- 2008-02-02 CN CN2008100574867A patent/CN101277017B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118031A (en) * | 2010-12-25 | 2011-07-06 | 广东明阳龙源电力电子有限公司 | Method for calculating instantaneous reactive power of power system based on vector recognition and SVC (static var compensator) compensation device |
| CN104333003A (en) * | 2014-10-28 | 2015-02-04 | 国网辽宁省电力有限公司朝阳供电公司 | Harmonic control method for photovoltaic power generation system |
| CN106549388A (en) * | 2015-09-18 | 2017-03-29 | 国家电网公司 | A kind of distributed SVC Control protection systems |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20130220 |
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Effective date of registration: 20130220 Address after: 100085 Beijing city Haidian District Qinghe small Camp Road No. 15 Patentee after: China Electric Power Research Institute Patentee after: State Grid Corporation of China Address before: 100085 Beijing city Haidian District Qinghe small Camp Road No. 15 Patentee before: China Electric Power Research Institute |