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As the wind power penetration is increasing rapidly into the power grid, modern gird codes require the wind turbines (WTs) to possess the low voltage ride-through (LVRT) capability. In order to evaluate the performance of a WT under grid fault conditions, a voltage sag generator (VSG) is needed to simulate all kinds of grid faults. This paper investigates a three-phase programmable VSG based on a...
In order to improve the performance of complementary half controlled three phase PWM boost rectifier, an improved control scheme including the current coordinate control and grid voltage oriented control is proposed. The current coordinate control is applied to obtain sinusoidal grid-side input currents and steady DC bus voltages. Grid voltage oriented control is applied to eliminate the impact of...
This paper proposes an improved predictive current control scheme for grid-connected DC-AC voltage source converters (GC-VSCs) when the grid voltage is unbalanced. The control scheme is based on space vector modulation (SVM) technique and implemented in the stationary reference frame without involving any current-sequential decomposition process. Due to the requirement for controlling the ac terms...
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