AUTHORS: Tuan Ngoc Anh Nguyen, Duy Cong Pham, Cong-Thanh Pham, Nguyen Huu Chan Thanh
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ABSTRACT: A comparative study of three d-axis stator current control methods for machine side converter in permanent magnet synchronous generator based on wind energy systems is proposed in this paper. Firstly, the zero d-axis stator current (ZDC) control method is performed by setting set the d-axis component of the stator current to zero. Secondly, the unity power factor (UPF) control method is designed to set the angle between stator current vector and stator voltage vector to zero. Thirdly, the constant stator flux-linkage (CSFL) control method is designed to regulate the stator flux-linkage, making it equal to the permanent magnet flux linkage. Finally, the performance of the three control methods are evaluated and compared based on some key parameters, which are the d-axis current, q-axis current, stator flux, active power, reactive power and apparent power, power factor under the same operating conditions. The feasibility and effectiveness of the three d-axis stator current control methods are demonstrated through Matlab simulations.
KEYWORDS: Permanent magnet synchronous generator (PMSG), wind energy systems (WES), wind energy conversion system (WECS), zero d-axis stator current (ZDC) control, unity power factor (UPF) control, constant stator flux-linkage (CSFL) control.
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