International Conference Yi-Kyu Kang, Hea-Gwang Jeong, and Kyo-Beum Lee, "Control Method in a Wind Turbine driven by 3-Parallel Back-to-Back Converters using PQR Power Transformation," in Proc. IPEC (ECCE-Asia) Conf., Jun. 2010, pp. 2562–2568.
2010
본문
A power conversion system in a wind turbine using a Permanent Magnet Synchronous Generator (PMSG) is directly connected
between a generator and a grid. The capacity of power semiconductor switches and filters should be selected regarding the overall
system rating and the output power quality. The use of an LCL-filter and n-parallel power conversion devices can be the best
solution for these problems in a high power system. However, the resonant pole introduced in the LC part produces resonance in
the system leading to the stability problem. The voltage difference between the parallel back-to-back converters generates a zero-
sequence circulating current. In this paper, a novel control method using a PQR transformation for simultaneously compensating of
both the LCL-filter resonance and the zero-sequence circulating current in a wind power system driven by 3-parallel back-to-back
converters is proposed. The effectiveness of the proposed control method is verified by simulations.
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