Abstract：Abstract Asymmetrical grid faults will introduce negative sequence components into grid- connected currents, and results in overvoltage or large voltage fluctuations across the capacitors in a Z-source inverter (ZSI). When the ZSI is used to a wind power generation system, the voltage fluctuations may even lead to generator torque ripples. Thus, this paper proposes a ride-through scheme to mitigate the adverse effects caused by asymmetrical grid faults, for the ZSI-based wind power system using permanent magnet synchronous generator (PMSG). In this scheme, the solution based on super-capacitor, controlled by a proportional-resonant controller, is used to limit the voltage rise and reduce the voltage fluctuations in the ZSI. Meanwhile, the negative sequence components of the grid currents are eliminated effectively, by using separate positive and negative sequence control loops. Simulation and experimental results are presented to verify the effectiveness of the proposed control scheme.
黄守道, 张阳, 荣飞. 基于Z源逆变器的永磁直驱风电系统不对称故障穿越策略[J]. 电工技术学报, 2016, 31(增刊): 92-101.
Huang Shoudao,Zhang Yang,Rong Fei. A Ride-Through Strategy of D-Permanent Magnet Synchronous Generator System Based on Z-Source Inverter During the Asymmetrical Faults. Transactions of China Electrotechnical Society, 2016, 31(增刊): 92-101.
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2016, Vol. 31 
