Title:
PILOT PROTECTION METHOD FOR TRANSMISSION LINE OF NEW ENERGY STATION BASED ON CURRENT WAVEFORM SIMILARITY
Document Type and Number:
WIPO Patent Application WO/2018/129842
Kind Code:
A1
Abstract:
A pilot protection method for a transmission line of a new energy station based on current waveform similarity, comprising: mounting identical relay protection devices (M, N) respectively on sides M and N of a transmission line of the new energy station, each protection device (M, N) independently measuring the three-phase (A-phase, B-phase, C-phase) current of its own side, and acquiring the three-phase (A-phase, B-phase, C-phase) current of the opposite side by means of a communication channel; each relay protection device (M, N) calculating correlation coefficients (rA, rB, rC) according to the same-phase current sampled values within the same time window of its own side and the opposite side, the same time window referring to the time window both of the sides correspond to at the same time; and each relay protection device (M, N) determining, according to whether the calculated correlation coefficients (rA, rB, rC) of currents of each phase are greater or smaller than or equal to a set value (rset), whether a fault occurs in the transmission line of the new energy station, and then enabling a corresponding protective measure according to the fault category. The method can provide transmission lines of a various types of new energy stations having different capacity sizes with pilot protection of a new principle which has high reliability and sensitivity, and a good speed.
Inventors:
BI TIANSHU (CN)
LI YANBIN (CN)
JIA KE (CN)
YANG QIXUN (CN)
LI YANBIN (CN)
JIA KE (CN)
YANG QIXUN (CN)
Application Number:
PCT/CN2017/083926
Publication Date:
July 19, 2018
Filing Date:
May 11, 2017
Export Citation:
Assignee:
UNIV NORTH CHINA ELECTRIC POWER (CN)
International Classes:
H02H7/26
Foreign References:
| CN102255291A | 2011-11-23 | |||
| US20030060991A1 | 2003-03-27 | |||
| CN105891676A | 2016-08-24 | |||
| CN105356428A | 2016-02-24 |
Other References:
DUAN, JIANDONG ET AL.: "Line Protection Based on Current Frequency Difference for Active Distribution Network", PROCEEDINGS OF THE CSEE, vol. 36, no. 11, 5 June 2016 (2016-06-05), pages 2927 - 2934, XP009515470, ISSN: 0258-8013
KONG, FEI ET AL.: "A Novel Pilot Protection Scheme for HVDC Transmission Lines Based on Waveform Correlation Analysis of Traveling Wave", DIAN LI XI TONG ZI DONG HUA = AUTOMATION OF ELECTRIC POWER SYSTEMS, vol. 38, no. 20, 25 October 2014 (2014-10-25), pages 108 - 109, XP009515456, ISSN: 1000-1026, DOI: 10.7500/AEPS20130922015
KONG, FEI ET AL.: "A Novel Pilot Protection Scheme for HVDC Transmission Lines Based on Waveform Correlation Analysis of Traveling Wave", DIAN LI XI TONG ZI DONG HUA = AUTOMATION OF ELECTRIC POWER SYSTEMS, vol. 38, no. 20, 25 October 2014 (2014-10-25), pages 108 - 109, XP009515456, ISSN: 1000-1026, DOI: 10.7500/AEPS20130922015
Attorney, Agent or Firm:
BEIJING CATALY IP ATTORNEY AT LAW (CN)
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