CN1881724A - Back-to-back differential protection method in high-voltage DC power transmission system - Google Patents
Back-to-back differential protection method in high-voltage DC power transmission system Download PDFInfo
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Abstract
The invention relates to a method for realizing direct-current protection function in the high-voltage direct-current transmission project, especially a back-to-back differential protection method in the back-to-back direct-current project, wherein the back-to-back differential protection is the unique function in the back-to-back high-voltage direct-current transmission project, which measures the currents of converter transformer, to protect the field between two current inducers of it. The invention also comprises the measurement of three-phase alternative-current and relative calculation, the projection judge, projection segment and value set of back-to-back differential protection.
Description
Technical field
The present invention relates to the implementation method of a kind of direct current protecting function in the high voltage direct current transmission project, especially the implementation method of back-to-back differential protection in the back-to-back DC power transmission engineering.
Background technology
The basic characteristics of back-to-back DC power transmission engineering are that rectification and inversion system coexist in the current conversion station, and converter is generally one pole 12 systolic structures, and the dc low-voltage side joint is gone into current conversion station ground network.
Back-to-back differential protection is the peculiar direct current protecting function of high voltage direct current transmission project back-to-back, and its measures the electric current of both sides converter transformer secondary side, the zone between the converter transformer secondary side current instrument transformer of protection both sides.The direct current protecting system should dispose perfect direct current protecting function, makes it can detect all possible fault in the protection zone, optionally moves and alarms.
Summary of the invention
The implementation method that the purpose of this invention is to provide back-to-back differential protection in a kind of back-to-back DC power transmission engineering under fault or overstress situation, prevents to damage high voltage direct current equipment.
Technical scheme of the present invention is, a kind of back-to-back differential protection method in high-voltage DC power transmission system, and the step of this method is as follows:
(1) measurements and calculations of current conversion station both sides converter transformer secondary side three-phase alternating current:
After three-phase current IaD1, IbD1, IcD1, IaD2, IbD2, the IcD2 of three-phase current IaY1, IbY1, IcY1, IaY2, IbY2, IcY2 and the D winding of the converter transformer secondary side Y winding of both sides passes through current transformation respectively; convert the correspondent voltage signal to and deliver to operation processing unit; calculate rectified value IacY1, IacY2, IacD1, the IacD2 of both sides alternating current then respectively, these values are used for later protection and judge:
IacY1＝(|IaY1|+|IbY1|+|IcY1|)/2
IacY2＝(|IaY2|+|IbY2|+|IcY2|)/2
IacD1＝(|IaD1|+|IbD1|+|IcD1|)/2
IacD2＝(|IaD2|+|IbD2|+|IcD2|)/2
(2) determine the protection criterion of back-to-back differential protection, the protection criterion is:
|IacY1-IacY2|＞Δ
Or | IacD1-IacD2|＞Δ
Wherein IacY1, the IacY2 change of current that is respectively both sides becomes the rectified value of the three-phase current of valve side Y winding, and the change of current that IacD1, IacD2 are respectively both sides becomes the rectified value of the three-phase current of valve side D winding;
(3) Bao Hu segmentation and definite value setting:
Back-to-back differential protection is established two sections definite values and corresponding time-delay, the result of the on-the-spot dynamic performance testing of definite foundation of protection definite value, and when AC system low-voltage or converter valve commutation failure, back-to-back differential protection can not misoperation,
The protection definite value comprises:
A) | IacY1-IacY2|＞K1*Idn+k1 ' * rectification side Y winding three-phase current commutates value
Or | IacD1-IacD2|＞K1*Idn+k1 ' * rectification side Y winding three-phase current commutates value
The phase shift locking, time delay t1, protection at a slow speed
b)|IacY1-IacY2|＞K2*Idn
Or | IacD1-IacD2|＞K2*Idn
The phase shift locking, time delay t2 protects fast
Idn is a dc rated current
(4) Bao Hu sequence of movement:
After the back-to-back differential protection action, send out phase shift locking order to utmost point control system, thereby make the direct current system emergency outage, jump both sides AC circuit breaker, starting both sides breaker fail protection simultaneously.
When in its protection zone ground connection and short trouble taking place, the electric current of both sides has very big difference, after this protection detects fault current, through certain time-delay output protection actuating signal, back-to-back DC power transmission system is stopped transport.Because the protection range of back-to-back differential protection is wide, it always uses as backup protection.After the back-to-back differential protection action, send out phase shift locking order to utmost point control system, thereby make the direct current system emergency outage, jump both sides AC circuit breaker, starting both sides breaker fail protection simultaneously.
Description of drawings
Fig. 1 is the schematic diagram of the measuring-signal of back-to-back differential protection of the present invention;
Fig. 2 is the logic diagram of the implementation method of back-to-back differential protection of the present invention.
Embodiment
Measuring-signal IaY1, IbY1, IcY1, IaY2, IbY2, IcY2, IaD1, IbD1, IcD1, the IaD2 of back-to-back differential protection, the position of IbD2, IcD2 have been provided among Fig. 1.Present embodiment is an example with the back-to-back DC engineering that adopts one pole 12 pulse conversion devices, introduces the implementation method of back-to-back differential protection.
The present invention can realize that the microcomputer direct current protective device has been a present technique field device commonly used with the microcomputer direct current protective device.Microcomputer type direct current protecting device is at first gathered both sides converter transformer current on valve side, calculates rectified value IacY1, IacY2, IacD1, the IacD2 of both sides alternating current, then logic determines and the processing of protecting according to the logic diagram (Fig. 2) of protection.
Step is as follows:
(1) measurements and calculations of current conversion station both sides converter transformer secondary side three-phase alternating current:
After three-phase current IaD1, IbD1, IcD1, IaD2, IbD2, the IcD2 of three-phase current IaY1, IbY1, IcY1, IaY2, IbY2, IcY2 and the D winding of the converter transformer secondary side Y winding of both sides passes through current transformation respectively; convert the correspondent voltage signal to and deliver to operation processing unit; calculate rectified value IacY1, IacY2, IacD1, the IacD2 of both sides alternating current then respectively, these values are used for later protection and judge:
IacY1＝(|IaY1|+|IbY1|+|IcY1|)/2
IacY2＝(|IaY2|+|IbY2|+|IcY2|)/2
IacD1＝(|IaD1|+|IbD1|+|IcD1|)/2
IacD2＝(|IaD2|+|IbD2|+|IcD2|)/2
(2) determine the protection criterion of back-to-back differential protection, the protection criterion is:
|IacY1-IacY2|＞Δ
Or | IacD1-IacD2|＞Δ
Wherein IacY1, the IacY2 change of current that is respectively both sides becomes the rectified value of the three-phase current of valve side Y winding, and the change of current that IacD1, IacD2 are respectively both sides becomes the rectified value of the three-phase current of valve side D winding;
(3) Bao Hu segmentation and definite value setting:
Back-to-back differential protection is established two sections definite values and corresponding time-delay, the result of the on-the-spot dynamic performance testing of definite foundation of protection definite value, and when AC system low-voltage or converter valve commutation failure, back-to-back differential protection can not misoperation,
The protection definite value comprises:
A) | IacY1-IacY2|＞K1*Idn+k1 ' * rectification side Y winding three-phase current commutates value
Or | IacD1-IacD2|＞K1*Idn+k1 ' * rectification side Y winding three-phase current commutates value
The phase shift locking, time delay t1, protection at a slow speed
b)|IacY1-IacY2|＞K2*Idn
Or | IacD1-IacD2|＞K2*Idn
The phase shift locking, time delay t2 protects fast
Idn is a dc rated current
(4) Bao Hu sequence of movement:
After the back-to-back differential protection action, send out phase shift locking order to utmost point control system, thereby make the direct current system emergency outage, jump both sides AC circuit breaker, starting both sides breaker fail protection simultaneously.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (1)
1, a kind of back-to-back differential protection method in high-voltage DC power transmission system is characterized in that, the step of this method is as follows:
(1) measurements and calculations of current conversion station both sides converter transformer secondary side three-phase alternating current:
After three-phase current IaD1, IbD1, IcD1, IaD2, IbD2, the IcD2 of three-phase current IaY1, IbY1, IcY1, IaY2, IbY2, IcY2 and the D winding of the converter transformer secondary side Y winding of both sides passes through current transformation respectively; convert the correspondent voltage signal to and deliver to operation processing unit; calculate rectified value IacY1, IacY2, IacD1, the IacD2 of both sides alternating current then respectively, these values are used for later protection and judge:
IacY1＝(|IaY1|+|IbY1|+|IcY1|)/2
IacY2＝(|IaY2|+|IbY2|+|IcY2|)/2
IacD1＝(|IaD1|+|IbD1|+|IcD1|)/2
IacD2＝(|IaD2|+|IbD2|+|IcD2|)/2
(2) determine the protection criterion of back-to-back differential protection, the protection criterion is:
|IacY1-IacY2|＞Δ
Or | IacD1-IacD2|＞Δ
Wherein IacY1, the IacY2 change of current that is respectively both sides becomes the rectified value of the three-phase current of valve side Y winding, and the change of current that IacD1, IacD2 are respectively both sides becomes the rectified value of the three-phase current of valve side D winding;
(3) Bao Hu segmentation and definite value setting:
Back-to-back differential protection is established two sections definite values and corresponding time-delay, the result of the on-the-spot dynamic performance testing of definite foundation of protection definite value, and when AC system low-voltage or converter valve commutation failure, back-to-back differential protection can not misoperation,
The protection definite value comprises:
A) | IacY1-IacY2|＞K1*Idn+k1 ' * rectification side Y winding three-phase current commutates value
Or | IacD1-IacD2|＞K1*Idn+k1 ' * rectification side Y winding three-phase current commutates value
The phase shift locking, time delay t1, protection at a slow speed
b)|IacY1-IacY2|＞K2*Idn
Or | IacD1-IacD2|＞K2*Idn
The phase shift locking, time delay t2 protects fast
Idn is a dc rated current
(4) Bao Hu sequence of movement:
After the back-to-back differential protection action, send out phase shift locking order to utmost point control system, thereby make the direct current system emergency outage, jump both sides AC circuit breaker, starting both sides breaker fail protection simultaneously.
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| CNB2005100176917A CN100574032C (en) | 2005-06-15 | 2005-06-15 | Back-to-back differential protection method in high-voltage DC power transmission system |
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| CNB2005100176917A CN100574032C (en) | 2005-06-15 | 2005-06-15 | Back-to-back differential protection method in high-voltage DC power transmission system |
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| CN1881724A true CN1881724A (en) | 2006-12-20 |
| CN100574032C CN100574032C (en) | 2009-12-23 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149421B (en) * | 2007-11-09 | 2010-06-02 | 中国电力科学研究院 | Direct current converter valve low voltage parameter operation test method |
| CN101882774A (en) * | 2010-03-30 | 2010-11-10 | 南方电网技术研究中心 | DC de-icing device without special rectifier transformer and protection method thereof |
| CN101944721A (en) * | 2009-07-10 | 2011-01-12 | 国网运行有限公司上海超高压管理处 | Valve fault detection treatment method of high-voltage direct-current transmission system |
| CN101557106B (en) * | 2009-01-15 | 2011-01-19 | 南方电网技术研究中心 | Method for computing the reliability of UHVDC transmission system |
| CN101534009B (en) * | 2009-04-24 | 2011-12-07 | 华南理工大学 | Analysis method for operating characteristics of power-frequency variable directional protection of AC-DC interconnected power grid |
| CN103326317A (en) * | 2013-01-14 | 2013-09-25 | 中国能源建设集团广东省电力设计研究院 | Criterion for allocating high-voltage side auxiliary failure protection for transformer used for convertor station |
| CN103346541A (en) * | 2013-06-20 | 2013-10-09 | 国家电网公司 | Convertor station direct current filter differential protection method and device |
| CN103532112A (en) * | 2013-09-23 | 2014-01-22 | 南方电网科学研究院有限责任公司 | Direct-current differential protection method for sectional valve group |
| CN106571620A (en) * | 2016-10-12 | 2017-04-19 | 南方电网科学研究院有限责任公司 | Fault determination method for direct-current line grounding short circuit of double-end flexible direct-current power transmission system |
| CN106877296A (en) * | 2017-03-10 | 2017-06-20 | 国网内蒙古东部电力有限公司通辽供电公司 | Current conversion station integration protection method based on broad sense no-load voltage ratio |
| CN107453386A (en) * | 2017-08-24 | 2017-12-08 | 中国南方电网有限责任公司 | Power transmission control method and flexible DC power transmission device |
| 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 |
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2005
- 2005-06-15 CN CNB2005100176917A patent/CN100574032C/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149421B (en) * | 2007-11-09 | 2010-06-02 | 中国电力科学研究院 | Direct current converter valve low voltage parameter operation test method |
| CN101557106B (en) * | 2009-01-15 | 2011-01-19 | 南方电网技术研究中心 | Method for computing the reliability of UHVDC transmission system |
| CN101534009B (en) * | 2009-04-24 | 2011-12-07 | 华南理工大学 | Analysis method for operating characteristics of power-frequency variable directional protection of AC-DC interconnected power grid |
| CN101944721A (en) * | 2009-07-10 | 2011-01-12 | 国网运行有限公司上海超高压管理处 | Valve fault detection treatment method of high-voltage direct-current transmission system |
| CN101882774A (en) * | 2010-03-30 | 2010-11-10 | 南方电网技术研究中心 | DC de-icing device without special rectifier transformer and protection method thereof |
| CN101882774B (en) * | 2010-03-30 | 2012-09-26 | 南方电网科学研究院有限责任公司 | Direct-current ice melting device without special rectifier transformer and protection method thereof |
| CN103326317B (en) * | 2013-01-14 | 2015-10-28 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of Converter Station high voltage side of transformer assists the collocation method of failure protection |
| CN103326317A (en) * | 2013-01-14 | 2013-09-25 | 中国能源建设集团广东省电力设计研究院 | Criterion for allocating high-voltage side auxiliary failure protection for transformer used for convertor station |
| CN103346541A (en) * | 2013-06-20 | 2013-10-09 | 国家电网公司 | Convertor station direct current filter differential protection method and device |
| CN103346541B (en) * | 2013-06-20 | 2015-09-30 | 国家电网公司 | Convertor station direct current filter differential protection method and device |
| CN103532112A (en) * | 2013-09-23 | 2014-01-22 | 南方电网科学研究院有限责任公司 | Direct-current differential protection method for sectional valve group |
| CN106571620A (en) * | 2016-10-12 | 2017-04-19 | 南方电网科学研究院有限责任公司 | Fault determination method for direct-current line grounding short circuit of double-end flexible direct-current power transmission system |
| CN106571620B (en) * | 2016-10-12 | 2019-01-18 | 南方电网科学研究院有限责任公司 | Fault determination method for direct-current line grounding short circuit of double-end flexible direct-current power transmission system |
| CN106877296A (en) * | 2017-03-10 | 2017-06-20 | 国网内蒙古东部电力有限公司通辽供电公司 | Current conversion station integration protection method based on broad sense no-load voltage ratio |
| CN106877296B (en) * | 2017-03-10 | 2018-10-16 | 国网内蒙古东部电力有限公司通辽供电公司 | Current conversion station integration protection method based on broad sense no-load voltage ratio |
| CN107453386A (en) * | 2017-08-24 | 2017-12-08 | 中国南方电网有限责任公司 | Power transmission control method and flexible DC power transmission device |
| 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 |
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| CN100574032C (en) | 2009-12-23 |
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