Direct-drive low-speed wind energy conversion system incorporating axial-type permanent magnet generator and Z-source inverter with sensorless maximum power point tracking controller

作者：Ramasamy Bharani Kumar^*; Palaniappan Aravindan; Yakoh Sanavullah Mohamed

来源：IET Renewable Power Generation, 2013, 7(3): 284-295.

DOI：10.1049/iet-rpg.2012.0248

With the ever increasing concern on environmental pollution and energy crisis, generation of power from wind is developing very fast. In the proposed wind energy conversion system (WECS), a variable-speed wind turbine, axial-type permanent magnet generator (PMG), Z-source inverter (ZSI) and sensorless maximum power point tracking (MPPT) controller are included. Although the conventional-type induction generator has the advantage of robust construction and maintenance-free operation, it has drawbacks like low-power factor and need for an ac excitation source which is overcome by the PMG. To obtain fixed voltage and frequency, PMG-generated voltage is fed to power converters. Conventionally the three stages of power conversion consist of rectifier, boost chopper and pulse-width-modulated inverter which reduce the efficiency, power quality and reliability of the overall WECS. To overcome these barriers of conventional system a two-stage-based direct-drive WECS is proposed. The maximum power point for each speed is traced using sensorless MPPT controller, which estimates the rotor speed, by using a simple sensorless speed estimator which is given as the input to the MPPT controller. The proposed sensorless MPPT controller for direct-drive WECS along with the ZSI is simulated in MATLAB/SIMULINK and the results are compared with experimental setup.

• 出版日期2013-5