Abstract

This paper proposes a control scheme of the low voltage ride through (LVRT) in wind turbines (WTs). The LVRT requirement which is included in the grid-code regulates WTs to maintain their operation and supply reactive power during grid fault. If the systems do not have solutions for the LVRT control, the WTs cannot maintain operation under LVRT condition or the faults can be generated in the system. This paper proposes a detection method of grid faults and control strategy for flexible power control under LVRT condition. In addition, the control scheme using a direct power control based on a sliding mode control (DPC-SMC) improves a performance of the LVRT control. The simulation results verify the validity of a proposed control scheme.

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