Document Abstract
Control of terminal voltage and frequency of a stand-alone wind-driven selfexcited induction generator with variable loads is proposed using an improved direct voltage control (DVC) strategy.
The DVC strategy, including a proportional-integral (PI) regulator, lead–lag corrector, and a feed-forward compensator, is designed based on the system transfer function matrix. The PI regulator can eliminate the steadystate tracking errors of the terminal voltage. The lead–lag corrector is employed to enlarge the phase stability margin of the dominant loops while the feedforward compensator is adopted to mitigate the voltage harmonics resulting from the cross-coupling dynamics. The simulation and experimental results verify that the proposed strategy has a fast dynamic response and can effectively control the generated voltage with low harmonic distortions under different linear or nonlinear loads.