Optimal Control of Variable Speed Wind Turbines with Battery Energy Storage

摘要

This paper proposes the output power maximization control of wind energy systems with battery energy storage. A permanent magnet synchronous generator (PMSG) is used as a variable speed generator in the proposed wind energy system. In most of the peak power extraction methods for wind turbine generation systems described in the current literature, the wind energy systems are designed to be efficient in high wind speeds and have a cut-off wind speed which is the minimum threshold to obtain energy. In order to achieve the maximum power control of the wind turbine across a wide range of wind speeds, a dynamic behaviour of the wind system with battery energy storage including wind disturbances is theoretically analyzed in this paper. A buck-boost converter is designed to allow the wind generator output voltage to be controlled, while allowing a constant DC voltage to the load. Then, the proposed maximum power point tracking (MPPT) control method, where the information on wind velocity is not required, is used to analyze the maximum power point of the wind turbine.