Internal Short Circuit Protection for Rotor Winding of Variable Speed Pumped-Storage Generator-Motor

doi:10.11930/j.issn.1004-9649.202011097

Abstract

Abstract: To provide a solution to the imperfect protection problem of variable speed pumped-storage units when the rotor winding has internal short circuit faults, a stator-side branch circulation current based protection method is proposed for internal short circuit of AC excitation motor rotor winding. Based on the multi-loop theory, the key technologies for internal short circuit protection are studied in terms of digital filter design, protection criteria, error prevention measures. A protection prototype is developed and a dynamic simulation experiment platform is established for its verification. The experimental results show that the proposed method can reliably reflect the inter-turn and phase-phase short-circuit faults of the rotor winding. The protection devices developed based on the method will be applied in a variable speed pumped storage unit in China.

Key words: variable speed pumped storage unit, AC excitation, rotor winding, inter-turn short-circuit, phase-phase short-circuit

CHEN Jun, YE Hong, LI Huazhong, LI Jianchun, CHEN Xiaogang, WANG Kai. Internal Short Circuit Protection for Rotor Winding of Variable Speed Pumped-Storage Generator-Motor[J]. Electric Power, 2021, 54(12): 121-127,136.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202011097

https://www.electricpower.com.cn/EN/Y2021/V54/I12/121

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