Transient travelling wave amplitude integral type superspeed bus protection system and method thereof

Abstract

The invention relates to a transient travelling wave amplitude integral type superspeed bus protection system which has the advantages of simple structure, rapid detection speed, high sensitivity and the like and is convenient in use and a method thereof. The method is implemented as follows: installing N numbered protection units at the outlet of each outgoing line if a bus is connected with N numbered outgoing lines; realizing mutual communication between every two protection units via a signal bus; collecting the current and voltage signals of the line by each protection unit at a high speed, and independently judging the failure direction; if a certain protection unit judges that the line has a forward direction failure, sending out a lockout action message, transmitting the judgment result to other protection units by signal buses, receiving judgment results about respective line failure direction from other protection units, and comprehensively analyzing the judgment results of all protection units by each protection unit so as to determine the bus state; if all the protection units judge that the failure comes from the reverse direction, determining that the bus has a failure so as to promptly give out an instruction to trip off respective side switch to isolate the failed bus; and otherwise, determining that the bus has no failure and requires no isolation.

Description

technical field [0001] The invention relates to a transient traveling wave amplitude integral type ultra-high-speed busbar protection system and a method thereof. Background technique [0002] The substation bus that connects various power components such as power sources, transmission lines and loads is one of the most important components of a power system. If a fault occurs on a busbar, the busbar protection must quickly cut off all elements connected to it. Once the misjudgment of the busbar protection occurs, it will cause a large amount of power loss or affect the safety of the equipment, or cause a large-scale power outage, and even cause system stability problems. The consequences may be catastrophic. Therefore, designing a reasonable busbar protection scheme and selecting an excellent protection algorithm are crucial to the reliability, selectivity, sensitivity and action speed of busbar protection. [0003] According to the protection principle, there are two typ...

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Problems solved by technology

Literature [Ge Yaozhong, Dong Xingli, Dong Xinzhou, etc. Research on Current Traveling Wave Bus Based on Wavelet Analysis (1) Principle and Criterion [J]. Journal of Electrotechnical Society, 2003, 18(2): 95-99., Li Wei, Wang Qian, Du Yanhui. Distributed busbar protection based on mathematical morphology transient feature extraction [J]. Power System Protection and Control, 2009, 37(2): 11-15.] Proposed a busbar protection algorithm based on transient current , and use wavelet transform technology or mathematical morphology technology to identify fault features, but this type of algorithm only uses transient current signals, and if a small initial angle fault occurs, it will have a significant impact on its identification method

Literature [Duan Jiandong, Zhang Baohui, Zhang Shengxiang. Distributed busbar protection using line transient traveling wave power direction [J]. Chinese Journal of Electrical Engineering, 2004, 24(6): 7-12.] proposed using line transient traveling wave For distributed busbar protection in the power direction, the wavelet transform is used to extract the maximum value of the modulus of the initial voltage traveling wave and current traveling wave, the combination of the two determines the fault direction, and the identification results of each component are combined to finally identify the fault inside and outside the busbar area. This method still does not address the impact of small initial angle faults

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