基于H2/H∞状态反馈的风能转换系统的双频环优化控制

When the wind speed is below the rated value, the generator is controlled to maximize the efficiency of captured wind energy, as well as to reduce its mechanical oscillation to keep the wind energy conversion system (WECS) running steadily. According to multi-time scale of wind speed, two-frequency model is established for WECS based on the nonlinear mechanical model, and then two-frequency-loop optimal controller is designed. PI static optimal control is used in the low-frequency-loop, while multi-objective H2/H∞ state feedback optimal control is introduced in the high-frequency-loop. Simulation results demonstrate the feasibility of two-frequency-loop optimal control based on multi-objective H2/H∞ state feedback, and a trade-off is achieved between multi-objective optimizations.