Optimum design of high efficiency power conditioning wind energy system

This paper introduces a study for the small wind energy conversion system (WECS), which aims to select the optimum design parameters to achieve high performance system. The main features of the studied system are high efficiency, operation at maximum power point tracking (MPPT) and long battery lifetime. The Permanent Magnet Synchronous Generator (PMSG) operates at variable wind speed and it is connected to a full controlled active rectifier. The dc-link voltage is controlled to be fixed by using a storage system through Bi-directional power flow link. As the battery is the most costly part in the small WECS, the controller should have the ability to reduce the battery current ripple, which results in longer life for the battery. It is found here that the designed dc voltage level is the main factor that affects the battery current ripple. Therefore, a full study for choosing the optimum dc voltage level that results in better system performance is provided. A maximum power point tracking control is employed using hysteresis control for the fully controlled active rectifier. The complete system is studied, analyzed and simulated using PSIM to validate the system performance.