Research on the Self-excitation Characteristics and Practical Criterion in Isolated Hydropower Group
Conference: UPEC 2011 - 46th International Universities' Power Engineering Conference
09/05/2011 - 09/08/2011 at Soest, Germany
Proceedings: UPEC 2011
Pages: 5Language: englishTyp: PDF
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Authors:
Huang, Yang; Hu, Wei; Zhang, Yiwei (State Key Lab of Power Systems, Dept. of Electrical Engineering, Tsinghua University, Beijing, China)
Li, Jian; Zhou, Jian (Sichuan Electric Power Corporation, Chengdu, Sichuan, China)
Abstract:
Group hydropower plants may form an isolated grid with the outgoing of their transmission line. In this special situation, the characteristics of high-frequency and over-voltage of the isolated hydropower group have great influence on the self-excitation boundary conditions and transient control of the hydropower generators. This paper studies the self-excitation characteristics of generators in isolated hydropower group. The emphasis is placed on the great influence on self-excitation boundary conditions and transient process by the characteristics of high-frequency and over-voltage of the isolated hydropower group. To avoid self-excitation, two practical criterions are derived respectively in the form of impedance and capacity. Furthermore, simulation of the self-excitation transient process is carried out in an isolated hydropower group in Sichuan Power Grid. The results validate the conclusions of the research.