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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...
The original direct power control (DPC) is known to give a fast response under transient conditions. However, active power, reactive power, and current pulsations occur in steady-state operation. The variable structure control (VSC) method for a doubly-fed-induction-generator-based wind turbine system is presented, using the principles of an active and reactive power controller known as modified DPC...
This paper proposes second-order SDSDM (Space Dithered Sigma-Delta Modulation) to suppress the harmonic spikes in power conversion. PWM (Pulse Width Modulation) normally operates with a fixed switching frequency, which causes power spectrum to be concentrated at multiples of the switching frequency. The proposed scheme is confirmed in the DC/DC converter. The experimental results show that the proposed...
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