Power Control of the Variable-Speed Horizontal Axis Wind Turbine in Nonlinear Wind Speed Conditions

摘要

Due to the nonlinear wind speed profile caused by instabilities in wind flow conditions, there is a problem of maintaining maximum output power of wind turbine (WT). Variable-speed WT based on PMSG (permanent magnet synchronous generator) is potentially more efficient than fixed-speed ones. In such WT maintaining the optimal output voltage of generator (rotor angular velocity) and input voltage of load can be achieved by using a cascaded buck-boost converter. An algorithm for simulating the PMSG-based variable-speed WT control system with cascaded buck-boost converter is developed. The nonlinear conditions of wind flow, which impact wind speed profile (including wind speed variation, yaw error, tower shadow), are considerate. The results of performed simulation show that the algorithm can be effectively used in WT control system for nonlinear wind speed conditions.