PROJECT TITLE :
Enhanced Dynamic Voltage Control of Type 4 Wind Turbines During Unbalanced Grid Faults
The fully rated converter of sort 4 wind turbines is capable of providing dynamic voltage management throughout grid faults by injecting controlled reactive currents. This paper describes 3 totally different dynamic voltage management options during unbalanced grid faults: one) the positive sequence voltage control with solely a positive sequence reactive current injection and suppression of the negative sequence current; two) the positive sequence voltage management with limitation of the positive sequence reactive current injection and suppression of the negative sequence current; and 3) the positive and negative sequence voltage control with each a positive and a negative sequence reactive current injection. These totally different control options are compared in simulations of a wind power plant connected to a meshed power system, including synchronous generators. It's shown that both the positive sequence voltage control with limitation and also the positive and negative sequence voltage management can overcome the voltage rise and voltage distortion which will occur with pure positive sequence voltage control while not limitation. Each of these choices have a definite fault response, where the positive and negative sequence voltage control leads to a fault response that resembles the fault response of a synchronous generator with higher fault current contributions in the faulted phases.
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