a method for balancing a single-phase loaded three-phase induction generator一种平衡的方法一个单相三相感应发电机加载.pdfVIP

Energies 2012, 5, 3534-3549; doi:10.3390/en5093534 OPEN ACCESS energies ISSN 1996-1073 /journal/energies Article A Method for Balancing a Single-Phase Loaded Three-Phase Induction Generator Yaw-Juen Wang and Ming-Hsueh Lee * Graduate School of Engineering Science and Technology, National Yunlin University of Science Technology, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan; E-Mail: wangyj@.tw * Author to whom correspondence should be addressed; E-Mail: g9310807@.tw; Tel.: +886-5534-2601; Fax: +886-5531-2065. Received: 18 May 2012; in revised form: 23 August 2012 / Accepted: 10 September 2012 / Published: 13 September 2012 Abstract: When a three-phase induction generator (IG) supplies unbalanced loads, its terminal voltages and line currents are also unbalanced, which may cause the IG to overheat and need to be derated. A single-phase loaded self-excited induction generator (SEIG) works under most unfavorable load unbalance conditions. This paper proposes a three-capacitor circuit scheme and a method to find the values of the self-excitation capacitors that allow the SEIG to be balanced. The SEIG is modeled by a two-port network equivalent circuit that resolves the SEIG into its positive- and negative-sequence circuits associated with the self-excitation capacitors and the load. The