Research on the Self-excitation Characteristics and Practical Criterion in Isolated Hydropower Group
Konferenz: UPEC 2011 - 46th International Universities' Power Engineering Conference
05.09.2011 - 08.09.2011 in Soest, Germany
Tagungsband: UPEC 2011
Seiten: 5Sprache: EnglischTyp: PDF
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Autoren:
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)
Inhalt:
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.