CN103779867A - Control method for TCSC circuit - Google Patents
Control method for TCSC circuit Download PDFInfo
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- CN103779867A CN103779867A CN201410057448.7A CN201410057448A CN103779867A CN 103779867 A CN103779867 A CN 103779867A CN 201410057448 A CN201410057448 A CN 201410057448A CN 103779867 A CN103779867 A CN 103779867A
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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
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a control method for a TCSC circuit. The control method comprises the steps that a fault is cleared in first set time; whether the fault is cleared successfully or not is judged; if a circuit breaker does not act, the fault is not successfully cleared, the fault is cleared by backup protection in second set time, and the ascending coefficient of the TCSC circuit is adjusted to be lowered to a rated value in the time bucket when the circuit breaker does not act. According to the control method, the ascending coefficient is adjusted in the time bucket when the circuit breaker does not act, and therefore the energy consumption of the MOV of the TCSC circuit in the time bucket when the circuit breaker does not act is lowered; meanwhile, overheating damage, caused by high energy consumption, to the TCSC circuit in the time bucket when the circuit breaker does not act can be prevented, and the service life of the TCSC circuit is guaranteed. In addition, due to the fact that the energy consumption of the MOV is lowered through the control method, the MOV with small capacity can be adopted. In this way, the manufacturing cost of the TCSC circuit is lowered.
Description
Technical field
The control technology field that the present invention relates to transmit electricity, more particularly, relates to a kind of control method of controlled series compensation circuit.
Background technology
The execution mode that the application for stating in claims is intended in this part provides background or context.Description herein can comprise the concept that can probe into, but the concept of having expected or having probed into not necessarily.Therefore, unless point out at this, the content of describing in this part is not prior art for the application's specification and claims, and not because be included in just admit it is prior art in this part.
It is the reactive-load compensation equipment in circuit by capacitor's series that string is mended.Controlled series compensation (thyristor controlled series compensation, TCSC) is that the adjustable string of a kind of capacitive reactance is mended.In order to limit the pressure drop of controlled series compensation, be conventionally parallel with the metal oxide valve block (metal oxide valve, MOV) with nonlinear characteristic.
With reference to figure 1, Fig. 1 is a kind of controlled series compensation circuit diagram, comprising: be connected on the capacitor C in transmission line, the MOV in parallel with capacitor C, the by-pass switch branch road in parallel with MOV, the reactor L that by thyristor T controlled in parallel with capacitor C.Wherein, by-pass switch branch road comprises: damping circuit R and by-pass switch K.
MOV is a kind of nonlinear resistance, is rendered as large resistance in the situation that pressure drop is lower, and the electric current flowing through is very little; Exceed certain threshold value and work as its pressure drop, the electric current that it flows through can increase rapidly, is equivalent to its resistance value and reduces rapidly.Due to the nonlinear characteristic of MOV, the MOV of controlled series compensation circuit can play the protective effect that fault current falls, shunts in the ftercompction of restriction string.As shown in Figure 2, electric current increases along with the increase of voltage MOV volt-ampere characteristic.When MOV electric current increases, MOV also will absorb certain energy consumption.There is the upper limit in the energy consumption that MOV can absorb, can not exceed the design capacity of MOV, otherwise can damage because heat effect causes MOV.
In actual applications, exceed the upper limit for fear of the energy consumption of the MOV of controlled series compensation circuit, conventionally its energy consumption is monitored, if exceed predefined threshold value, need string to mend circuit bypass, it is excised from circuit.Putting into operation of controlled series compensation circuit has important function to the safe and stable operation of system, therefore, needs to formulate rational string and mends circuit control method, guarantees safe, the effectively use of string benefit circuit.
Existing controlled series compensation circuit control method is: in the time of the internal fault of generating region (string is mended circuit place line failure), in order to prevent that MOV from damaging, string can be mended to circuit bypass, it is not worked; Occurring when external area error (string mend beyond the circuit of circuit place position break down), string is mended circuit and is connected with transmission line, normally works, and keeps Lifting Coefficients constant, is only limited and is gone here and there ftercompction and fall and shunt fault current by MOV.
Inventor finds, adopts control method to control controlled series compensation circuit, and in the time external area error and circuit breaker occur occurring tripping, MOV energy consumption may be higher, thereby MOV capacity is proposed to high requirement.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of control method of controlled series compensation circuit, reduced between transmission line generating region outside the energy consumption of controlled series compensation circuit when fault.
For achieving the above object, the invention provides following technical scheme:
A control method for controlled series compensation circuit, in the time there is external area error, described control method comprises:
Carry out failure removal at the first setting-up time;
Judge that whether described failure removal is successful;
If the described fault of the unsuccessful excision of circuit breaker generation tripping, excises described fault at the second setting-up time by backup protection, and within the circuit breaker tripping time period, regulate the Lifting Coefficients of controlled series compensation circuit to rated value.
Preferably, in above-mentioned control method, described the first setting-up time is in the 0.05s-0.15s time period after described external area error occurs, and comprises endpoint value.
Preferably, in above-mentioned control method, described the second setting-up time is in the time period of 0.2s-0.5s after described the first setting-up time, comprises endpoint value.
Preferably, in above-mentioned control method, by regulating the thyristor of described controlled series compensation circuit to regulate the Lifting Coefficients of described controlled series compensation circuit.
Preferably, in above-mentioned control method, described control method is for the control of the controlled series compensation circuit of super, ultrahigh voltage alternating current transmission lines.
Preferably, in above-mentioned control method, the Lifting Coefficients of described controlled series compensation circuit in the time of normal operation is 1.0-3.0, comprises endpoint value.
Can find out from technique scheme, control method provided by the present invention comprises: carry out failure removal at the first setting-up time; Judge that whether described failure removal is successful; If the described fault of the unsuccessful excision of circuit breaker generation tripping, excises described fault at the second setting-up time by backup protection, and within the circuit breaker tripping time period, regulate the Lifting Coefficients of controlled series compensation circuit to rated value.Described control method, within the circuit breaker tripping time, regulate Lifting Coefficients, thereby reduce the energy consumption of the MOV of controlled series compensation circuit in the circuit breaker tripping time, can prevent that in the tripping time, controlled series compensation circuit, due to the mistake cause thermal damage that high energy consumption causes, has guaranteed the useful life of controlled series compensation circuit simultaneously.
And because described control method has reduced the energy consumption of MOV, can adopt the MOV that capacity is less, reduce the cost of manufacture of controlled series compensation circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of circuit diagram of controlled series compensation circuit;
The schematic flow sheet of the control method of a kind of controlled series compensation circuit that Fig. 2 provides for the embodiment of the present invention;
The energy consumption oscillogram of the MOV of a kind of controlled series compensation circuit that Fig. 3 provides for the embodiment of the present invention.
Embodiment
As described in background, existing controlled series compensation circuit control method is: in the time of the internal fault of generating region (string is mended circuit place line failure), in order to prevent that MOV from damaging, string can be mended to circuit bypass, it is not worked; Occurring when external area error (string mend beyond the circuit of circuit place position break down), string is mended circuit and is connected with transmission line, normally works, and maintains Lifting Coefficients constant, is only limited and is gone here and there ftercompction and fall and shunt fault current by MOV.
The discovery of invention human hair, although in the time of external area error, fault current is less,, if the circuit breaker generation misaction of transmission line can cause fault clearing time to extend, and then cause the operating time of controlled series compensation circuit to extend, cause energy consumption to raise.And the prolongation of MOV operating time can cause thermal losses, even damage.For addressing the above problem, the embodiment of the present application provides a kind of control method of controlled series compensation circuit, and the method comprises:
Carry out failure removal at the first setting-up time;
Judge that whether described failure removal is successful;
If the described fault of the unsuccessful excision of circuit breaker generation tripping, excises described fault at the second setting-up time by backup protection, and within the circuit breaker tripping time period, regulate the Lifting Coefficients of controlled series compensation circuit to rated value.
Described control method, within the circuit breaker tripping time, regulate Lifting Coefficients, thereby reduce the energy consumption of the MOV of controlled series compensation circuit in the circuit breaker tripping time, can prevent that in the tripping time, controlled series compensation circuit, due to the mistake cause thermal damage that high energy consumption causes, has guaranteed the useful life of controlled series compensation circuit simultaneously.
Because described control method has reduced the energy consumption of MOV, can adopt the MOV that capacity is less, reduce the cost of manufacture of controlled series compensation circuit.
Above-mentioned control method is the core concept of the embodiment of the present application, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Based on above-mentioned thought, the embodiment of the present application provides a kind of control method of controlled series compensation circuit, and with reference to figure 2, the method comprises: step S11: failure judgement type.
According to the judged result of transmission line malfunction, troubles inside the sample space or external area error while determining the fault occurring, if troubles inside the sample space carries out step S12, if external area error carries out step S13.
Step S12: by the bypass of controlled series compensation circuit.
If generating region internal fault, now fault current may be larger, in order to reduce energy consumption, and prevents the damage of the MOV of controlled series compensation circuit, now, control string can be mended to circuit bypass, and it is not worked.
Step S13: carry out failure removal at the first setting-up time.
If generation external area error, meets string and mend the condition of work of circuit, in the time range of setting, string is mended circuit and can be connected with transmission line, and it is constant to maintain Lifting Coefficients, is only fallen by the ftercompction of MOV restriction string and shunts fault current.
In the present embodiment, described the first setting-up time refers to, in the time period of 0.05s-0.15s after the described external area error of generation, comprise endpoint value.Preferably, can carry out failure removal for the 0.1s moment after breaking down.
Step S14: judge whether described fault excises successfully.
After transmission line breaks down, fault need to be excised so that carry out fault eliminating and maintenance.Transmission line is provided with circuit breaker, for faulty line is excised.But misaction can occur faulty line,, after breaking down, circuit breaker cannot respond control command excision faulty line.
If circuit breaker generation tripping, cannot excise fault, the operating time of the circuit of controlled series compensation can be extended so, and then the energy consumption of MOV can be increased, working long hours of MOV can produce larger heat under fault current simultaneously, affects useful life.Therefore, need to judge, determine whether described fault excises successfully.If success, carries out step S15, if unsuccessful, carry out step S16.
Step S15: do not change the Lifting Coefficients of controlled series compensation circuit, work to described fault is got rid of.
Now, the circuit breaker of faulty line can normally excise described fault,, external area error occurring in the time range of the described very first time, limits string ftercompction fall and shunt fault current by MOV, and implementing circuit is protected.
Owing to normally having excised external area error, so without adjustment, directly adopt existing control method to make controlled series compensation circuit carry out work.
Step S16: excise described fault at the second setting-up time by backup protection, and within the circuit breaker tripping time, regulate the Lifting Coefficients of controlled series compensation circuit to rated value.
In the present embodiment, described the second setting-up time is in the time period of 0.2s-0.5s after described the first setting-up time, comprises endpoint value.Preferably, can carry out failure removal for the 0.35s moment after breaking down.Described controlled series compensation circuit is 1.0-3.0 at the Lifting Coefficients occurring before external area error, comprises endpoint value.
Due to circuit breaker tripping occurring, the described fault of unsuccessful excision, so time, need to adopt the backup protection of all transmission lines place transmission system to excise described fault, described backup protection can be the switching protective device of bus, as the circuit breaker of bus.
Due to (the first setting-up time is within the time period of the second setting-up time) in the circuit breaker tripping time, it is the trouble duration of the described fault of unsuccessful excision, the extra increase of this time can make MOV energy consumption increase, in order to reduce MOV energy consumption, the present embodiment reduces the Lifting Coefficients of controlled series compensation circuit within this time period, and then reduce the capacitive reactance of controlled series compensation circuit, and then reduce the energy consumption of MOV.
Can be by regulating the thyristor of described controlled series compensation circuit to regulate the Lifting Coefficients of described controlled series compensation circuit.Thyristor has QA ability, and be μ s magnitude its operate time, therefore, and the quick adjustment that can mend circuit Lifting Coefficients by regulating described thyristor to realize whole string.After failure removal, can, by regulating described thyristor with the initial Lifting Coefficients of fast quick-recovery, can not have a negative impact to power system safety and stability operation equally.
Because described control method has reduced the energy consumption of MOV, described controlled series compensation circuit can adopt the MOV that capacity is less, has reduced the cost of manufacture of controlled series compensation circuit.
Applicating example:
Described control method can be used for the control of the controlled series compensation circuit of 500kV and above super, ultrahigh voltage alternating current transmission lines.The fixed series compensation of transmission line sending end installing 20%, the controlled series compensation of fixed series compensation+10% of receiving end installing 10%.Before fault, the Lifting Coefficients of controlled series compensation is 2.0.
When there is single-phase tripping in three-phase ground fault and circuit breaker outside generating region, during tripping, maintain current Lifting Coefficients 2.0 constant, or Lifting Coefficients is reduced to rated value 1.2, and its controllable part MOV energy consumption maximum is respectively 99MJ and 21MJ, and MOV energy consumption waveform is as shown in Figure 4.In this example; if controlled series compensation Lifting Coefficients is down to rated value during allowing external area error and circuit breaker tripping; MOV maximum energy consumption has significantly reduced by 79% when external area error; string is mended MOV overvoltage protection action definite value and the also corresponding reduction of MOV design capacity; thereby greatly reduce the cost (cost of MOV is higher, and every MJ cost is up to tens thousand of units) of MOV.
Known by foregoing description, control method described in the embodiment of the present application, in the time of external area error, and while there is circuit breaker tripping, the Lifting Coefficients that controlled series compensation circuit is set during tripping is reduced to rated value, maximum MOV energy consumption can reduce external area error time, contributes to reduce the design capacity of MOV, reduces the design cost of controlled series compensation circuit.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a control method for controlled series compensation circuit, is characterized in that, in the time there is external area error, described control method comprises:
Carry out failure removal at the first setting-up time;
Judge that whether described failure removal is successful;
If the described fault of the unsuccessful excision of circuit breaker generation tripping, excises described fault at the second setting-up time by backup protection, and within the circuit breaker tripping time period, regulate the Lifting Coefficients of controlled series compensation circuit to be reduced to rated value.
2. control method according to claim 1, is characterized in that, described the first setting-up time is in the time period of 0.05s-0.15s after described external area error occurs, comprises endpoint value.
3. control method according to claim 2, is characterized in that, described the second setting-up time is in the time period of 0.2s-0.5s after described the first setting-up time, comprises endpoint value.
4. control method according to claim 1, is characterized in that, by regulating the thyristor of described controlled series compensation circuit to regulate the Lifting Coefficients of described controlled series compensation circuit.
5. control method according to claim 1, is characterized in that, described control method is for the control of the controlled series compensation circuit of super, ultrahigh voltage alternating current transmission lines.
6. control method according to claim 1, is characterized in that, the Lifting Coefficients of described controlled series compensation circuit in the time of normal operation is 1.0-3.0, comprises endpoint value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057448.7A CN103779867A (en) | 2014-02-20 | 2014-02-20 | Control method for TCSC circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057448.7A CN103779867A (en) | 2014-02-20 | 2014-02-20 | Control method for TCSC circuit |
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| CN103779867A true CN103779867A (en) | 2014-05-07 |
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| CN201410057448.7A Pending CN103779867A (en) | 2014-02-20 | 2014-02-20 | Control method for TCSC circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375493A (en) * | 2015-11-24 | 2016-03-02 | 中国电力科学研究院 | Rated parameter adjustable series compensation design method |
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| US20120025760A1 (en) * | 2010-07-29 | 2012-02-02 | Sony Corporation | Feed system, feed apparatus, and electronic device |
| CN102790387A (en) * | 2012-07-31 | 2012-11-21 | 许继集团有限公司 | Protection device and series compensation system for metal oxide varistor in series compensation |
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2014
- 2014-02-20 CN CN201410057448.7A patent/CN103779867A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120025760A1 (en) * | 2010-07-29 | 2012-02-02 | Sony Corporation | Feed system, feed apparatus, and electronic device |
| CN102790387A (en) * | 2012-07-31 | 2012-11-21 | 许继集团有限公司 | Protection device and series compensation system for metal oxide varistor in series compensation |
Non-Patent Citations (1)
| Title |
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| 林集明等: "南方电网天平可控串联补偿装置", 《国际电力》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375493A (en) * | 2015-11-24 | 2016-03-02 | 中国电力科学研究院 | Rated parameter adjustable series compensation design method |
| CN105375493B (en) * | 2015-11-24 | 2019-02-22 | 中国电力科学研究院 | A kind of adjustable string benefit design method of nominal parameter |
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Application publication date: 20140507 |