CN105226620A - A kind of implementation method of bipolar commutation failure protection - Google Patents
A kind of implementation method of bipolar commutation failure protection Download PDFInfo
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- CN105226620A CN105226620A CN201510712856.6A CN201510712856A CN105226620A CN 105226620 A CN105226620 A CN 105226620A CN 201510712856 A CN201510712856 A CN 201510712856A CN 105226620 A CN105226620 A CN 105226620A
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Abstract
The present invention relates to a kind of implementation method of bipolar commutation failure protection, belong to extra-high voltage direct-current transmission resist technology field.First the present invention gathers the three-phase current of converter transformer valve star side and side, angle, with corresponding IVY and IVD obtained, and gathers the high and low side outlet electric current I DCP of valve group, IDCN, with the maximum among both for ID; Then protection decision logic is carried out according to adopted current signal, whether interpretation there is commutation failure, and after arbitrary bridge commutation failure being detected, start arbitrary bridge commutation failure logical circuit of counter, namely in window, whether corresponding commutation failure number of times occurs in effective time; As satisfied condition, then output action signal is to control system; If control system detects this pole actuating signal and meets pole actuating signal, then this pole of locking simultaneously.Said method proposed by the invention can failure judgement quickly and accurately, realizes bipolar quick lock, reduces the power fluctuation to ac grid system, improve the safe and reliable operation of ac grid system.
Description
Technical field
The present invention relates to a kind of implementation method of bipolar commutation failure protection, belong to extra-high voltage direct-current transmission resist technology field.
Background technology
Extra-high voltage direct-current commutation failure protection is defencive function important in extra-high voltage DC transmission system, detects the commutation failure that the situation such as fault in ac transmission system or valve control exception causes.Continuous commutation failure occurs single bridge generally causes because trigger impulse goes wrong, and fault in ac transmission system can cause all commutation failures in fortune valve group.Original commutation failure protection is configured with single bridge commutation failure section for the commutation failure that trigger impulse causes; Be configured with arbitrary bridge commutation failure quick fraction and section at a slow speed for fault in ac transmission system, relay protective scheme and time delay mainly consider that the maximum duration removed with fault in ac transmission system coordinates.
Along with the power of DC transmission system transmission is increasing; Simulation results shows: when there is the commutation failure of continuation; cause the power fluctuation of electrical network excessive; may cause the serious consequence of Out of step, therefore the ability to bear of ac grid system to commutation failure becomes the important external constraint of commutation failure protection definite value operate time.
Summary of the invention
The object of this invention is to provide a kind of implementation method of bipolar commutation failure protection, to reduce the power fluctuation of AC system electrical network when there is bipolar commutation failure.
The present invention solves the problems of the technologies described above the implementation method providing a kind of bipolar commutation failure protection, and the method comprises the following steps:
1) gather the three-phase current of converter transformer valve star side and side, angle, with corresponding IVY and IVD obtained, and gather the high and low side outlet electric current I DCP of valve group, IDCN, the maximum among both is as ID;
2) carry out protection decision logic according to the current signal collected, detect whether commutation failure occurs;
3) if after arbitrary bridge commutation failure being detected, then start arbitrary bridge commutation failure logical circuit of counter, namely in window, whether corresponding commutation failure number of times occurs in effective time, and export commutation failure protection actuating signal when satisfying condition to control system;
4) if control system detects that this pole all sends commutation failure protection actuating signal, this pole of locking in fortune valve group.
Described step 2) in protection decision logic as follows:
Star side criterion is: ID-IVY > Δ+K*ID, and ID*K > IVY;
Side, angle criterion is: ID-IVD > Δ+K*ID, and ID*K > IVD;
Δ is constant definite value, and K is ratio brake coefficient; Star, side, angle is arbitrary then thinks when meeting criterion and arbitrary bridge generation commutation failure detected.
Described step 1) in IVY be the half of converter transformer valve star side three-phase current absolute value sum, IVD is the half of side, converter transformer valve angle three-phase current absolute value sum.
Described step 3) in commutation failure logical circuit of counter be:
Be 0 moment with arbitrary bridge commutation failure, counter counts 1 self-sustaining first setting-up time section T1; If detect arbitrary bridge commutation failure during T1 to 2T1 after counter counts 1, then counter counts 2 also self-sustaining T1; Arbitrary bridge commutation failure is again detected during T1 to the second setting-up time section T2, then this valve unit protection action outlet after counter counts 2.
In the 2T1 moment that counter is after 1 in described commutation failure logical circuit of counter, counter clear 0.
Described outlet signal pulsewidth is the second setting-up time section T2.
Described step 4) in control system receive commutation failure protection actuating signal after, mutually transmit protection act signal between the two poles of the earth.
Described first setting-up time section T1 is 200ms, and the first setting-up time section T2 is 500ms.
The invention has the beneficial effects as follows: first the present invention gathers the three-phase current of converter transformer valve star side and side, angle, with corresponding IVY and IVD obtained, and gather the high and low side outlet electric current I DCP of valve group, IDCN, with the maximum among both for ID; Then protection decision logic is carried out according to adopted current signal, whether interpretation there is commutation failure, and after arbitrary bridge commutation failure being detected, start arbitrary bridge commutation failure logical circuit of counter, namely in window, whether corresponding commutation failure number of times occurs in effective time; As satisfied condition, then output action signal is to control system; If control system detects this pole actuating signal and meets pole actuating signal, then this pole of locking simultaneously.Said method proposed by the invention can failure judgement quickly and accurately, realizes bipolar quick lock, reduces the power fluctuation to ac grid system, improve the safe and reliable operation of ac grid system.
Accompanying drawing explanation
Fig. 1 is ultra high voltage major loop and measuring point schematic diagram;
Fig. 2 is the logical sequence schematic diagram of the bipolar commutation failure protection implementation method of the present invention;
Fig. 3 is the logic diagram of the bipolar commutation failure protection implementation method of the present invention;
Fig. 4 is the installation drawing that the bipolar commutation failure protection of the present invention realizes.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
The embodiment of the implementation method of a kind of bipolar commutation failure protection of the present invention
First the implementation method of the bipolar commutation failure protection in the present embodiment gathers the three-phase current of converter transformer valve star side and side, angle, with corresponding IVY and IVD obtained, and gathers the high and low side outlet electric current I DCP of valve group, IDCN, with the maximum among both for ID; Then protection decision logic is carried out according to adopted current signal, whether interpretation there is commutation failure, and after arbitrary bridge commutation failure being detected, start arbitrary bridge commutation failure logical circuit of counter, namely in window, whether corresponding commutation failure number of times occurs in effective time; As satisfied condition, then output action signal is to control system; If control system detects this pole actuating signal and meets pole actuating signal, then this pole of locking simultaneously.The specific implementation process of the method is as follows:
1. valve unit protection gathers converter transformer valve star side three-phase current, gets its absolute value sum and obtains IVY divided by 2; Gather side, converter transformer valve angle three-phase current, get its absolute value sum and obtain IVD divided by 2; Gather the high and low side outlet electric current of valve group, ask both maximums to be ID.In the present embodiment, ultra high voltage major loop and measuring point schematic diagram are as shown in Figure 1.
2. valve group carries out protection decision logic according to the above-mentioned current signal collected, and has judged whether arbitrary bridge generation commutation failure.The protection decision logic that it adopts is:
Star side criterion is: ID-IVY > Δ+K*ID, and ID*K > IVY;
Side, angle criterion is: ID-IVD > Δ+K*ID, and ID*K > IVD;
Δ is constant definite value, and K is ratio brake coefficient; Star, side, angle is arbitrary then thinks when meeting criterion and arbitrary bridge generation commutation failure detected.
If after arbitrary bridge commutation failure 3. being detected, be greater than certain value as total power value meets, then start arbitrary bridge commutation failure logical circuit of counter, namely in window, whether corresponding commutation failure number of times occurs in effective time, as satisfied condition, then output action signal is to control system.
As shown in Figures 2 and 3, in the present embodiment, commutation failure logical circuit of counter refers to: once arbitrary bridge commutation failure (0 moment) be detected, counter counts 1 is self-sustaining 200ms also, arbitrary bridge commutation failure detected during 200ms to 400ms after counter counts 1, counter counts 2 is self-shield 200ms also; Arbitrary bridge commutation failure again detected during 200ms to 500ms after counter counts 2, valve unit protection action exports, and outlet signal pulsewidth is 500ms.Its Counter is the 400ms moment after 1, counter O reset.
4. pole control detects the corresponding levels and all sends commutation failure protection actuating signal in fortune valve group; after control system receives protection act signal; mutually transmit protection act signal between the two poles of the earth, control system detects this pole actuating signal and meets pole actuating signal simultaneously, this pole of locking.Signal transmissions and logic finally realize relevant apparatus as shown in Figure 4.
Consider based on electric power netting safe running angle, the implementation method of bipolar commutation failure protection proposed by the invention comprises the protection act strategy of the collection of analog signal, Protection criteria and correspondence.Method proposed by the invention can failure judgement quickly and accurately, realizes bipolar quick lock, reduces the power fluctuation to ac grid system, improve the safe and reliable operation of ac grid system.
Claims (8)
1. an implementation method for bipolar commutation failure protection, is characterized in that, this implementation method comprises the following steps:
1) gather the three-phase current of converter transformer valve star side and side, angle, with corresponding IVY and IVD obtained, and gather the high and low side outlet electric current I DCP of valve group, IDCN, the maximum among both is as ID;
2) carry out protection decision logic according to the current signal collected, detect whether commutation failure occurs;
3) if after arbitrary bridge commutation failure being detected, then start arbitrary bridge commutation failure logical circuit of counter, namely in window, whether corresponding commutation failure number of times occurs in effective time, and export commutation failure protection actuating signal when satisfying condition to control system;
4) if control system detects that this pole all sends commutation failure protection actuating signal, this pole of locking in fortune valve group.
2. the implementation method of bipolar commutation failure protection according to claim 1, is characterized in that, described step 2) in protection decision logic as follows:
Star side criterion is: ID-IVY > Δ+K*ID, and ID*K > IVY;
Side, angle criterion is: ID-IVD > Δ+K*ID, and ID*K > IVD;
Δ is constant definite value, and K is ratio brake coefficient; Star, side, angle is arbitrary then thinks when meeting criterion and arbitrary bridge generation commutation failure detected.
3. the implementation method of bipolar commutation failure protection according to claim 2; it is characterized in that; described step 1) in IVY be the half of converter transformer valve star side three-phase current absolute value sum, IVD is the half of side, converter transformer valve angle three-phase current absolute value sum.
4. the implementation method of bipolar commutation failure protection according to claim 3, is characterized in that, described step 3) in commutation failure logical circuit of counter be:
Be 0 moment with arbitrary bridge commutation failure, counter counts 1 self-sustaining first setting-up time section T1; If detect arbitrary bridge commutation failure during T1 to 2T1 after counter counts 1, then counter counts 2 also self-sustaining T1; Arbitrary bridge commutation failure is again detected during T1 to the second setting-up time section T2, then this valve unit protection action outlet after counter counts 2.
5. the implementation method of bipolar commutation failure protection according to claim 4, is characterized in that, in the 2T1 moment that counter is after 1 in described commutation failure logical circuit of counter, and counter clear 0.
6. the implementation method of bipolar commutation failure protection according to claim 4, is characterized in that, described outlet signal pulsewidth is the second setting-up time section T2.
7. the implementation method of bipolar commutation failure protection according to claim 4, is characterized in that, described step 4) in control system receive commutation failure protection actuating signal after, mutually transmit protection act signal between the two poles of the earth.
8. the implementation method of bipolar commutation failure protection according to claim 6, is characterized in that, described first setting-up time section T1 is 200ms, and the first setting-up time section T2 is 500ms.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932705A (en) * | 2016-05-19 | 2016-09-07 | 国电南瑞科技股份有限公司 | Emergency control method for high-voltage direct-current continuous commutation failure |
| CN106253321A (en) * | 2016-08-31 | 2016-12-21 | 国网河南省电力公司电力科学研究院 | A kind of optimization method of DC control and protection system commutation failure PREDICTIVE CONTROL |
| CN108398616A (en) * | 2017-12-27 | 2018-08-14 | 广东电网有限责任公司电力调度控制中心 | A kind of alternating current circuit fault direction method of discrimination based on direct-current commutation failure detection |
| CN109659964A (en) * | 2017-10-12 | 2019-04-19 | 中国电力科学研究院 | A kind of method and device for preventing direct current locking |
| CN111239471A (en) * | 2020-01-19 | 2020-06-05 | 华南理工大学 | Commutation failure protection method and device, computer equipment and storage medium |
| CN111562462A (en) * | 2020-04-15 | 2020-08-21 | 国电南瑞科技股份有限公司 | Direct-current commutation failure identification method and device based on current characteristics of converter valve |
| CN111697546A (en) * | 2020-06-10 | 2020-09-22 | 南京南瑞继保电气有限公司 | Commutation failure acceleration protection method and system |
| CN113612190A (en) * | 2021-07-29 | 2021-11-05 | 中国电力科学研究院有限公司 | Method and system for executing alternating current line reclosing based on safety margin index |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932705B (en) * | 2016-05-19 | 2018-11-30 | 国电南瑞科技股份有限公司 | A kind of emergency control method for coping with the continuous commutation failure of high voltage direct current |
| CN105932705A (en) * | 2016-05-19 | 2016-09-07 | 国电南瑞科技股份有限公司 | Emergency control method for high-voltage direct-current continuous commutation failure |
| CN106253321A (en) * | 2016-08-31 | 2016-12-21 | 国网河南省电力公司电力科学研究院 | A kind of optimization method of DC control and protection system commutation failure PREDICTIVE CONTROL |
| CN106253321B (en) * | 2016-08-31 | 2018-08-24 | 国网河南省电力公司电力科学研究院 | A kind of optimization method of DC control and protection system commutation failure PREDICTIVE CONTROL |
| CN109659964B (en) * | 2017-10-12 | 2023-09-22 | 中国电力科学研究院 | Method and device for preventing direct current locking |
| CN109659964A (en) * | 2017-10-12 | 2019-04-19 | 中国电力科学研究院 | A kind of method and device for preventing direct current locking |
| CN108398616A (en) * | 2017-12-27 | 2018-08-14 | 广东电网有限责任公司电力调度控制中心 | A kind of alternating current circuit fault direction method of discrimination based on direct-current commutation failure detection |
| CN111239471A (en) * | 2020-01-19 | 2020-06-05 | 华南理工大学 | Commutation failure protection method and device, computer equipment and storage medium |
| CN111239471B (en) * | 2020-01-19 | 2021-02-19 | 华南理工大学 | Commutation failure protection method and device, computer equipment and storage medium |
| WO2021143793A1 (en) * | 2020-01-19 | 2021-07-22 | 华南理工大学 | Commutation failure protection method and apparatus, computer device, and storage medium |
| CN111562462A (en) * | 2020-04-15 | 2020-08-21 | 国电南瑞科技股份有限公司 | Direct-current commutation failure identification method and device based on current characteristics of converter valve |
| CN111697546A (en) * | 2020-06-10 | 2020-09-22 | 南京南瑞继保电气有限公司 | Commutation failure acceleration protection method and system |
| CN113612190A (en) * | 2021-07-29 | 2021-11-05 | 中国电力科学研究院有限公司 | Method and system for executing alternating current line reclosing based on safety margin index |
| CN113612190B (en) * | 2021-07-29 | 2023-10-13 | 中国电力科学研究院有限公司 | Method and system for executing reclosing of alternating current line based on safety margin index |
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