Research On Power Management And Operation Control Of Small Wind Turbine

This paper is to propose operation control strategy of small wind turbine system. Generally, small wind turbine has smaller power output and run stand-alone. Small wind turbine is not like grid connected wind turbine, it's not need to obtain the max power of wind. The operation control of off grid wind turbine is according to the need of load.The configuration is proposed according to characteristics of small wind turbine system. Including wind turbine, Permanent-Magnet Synchronization Generator (PMSG), three-phase rectifier, buck-boost converter, battery, inverter and AC load. A buck-boost converter is adopted in this system to improve operation performance compared to the general small wind turbine system. This system apply parallel load configuration. The generator supply to battery and AC load at the same time. Therefore battery and generator can supply to AC load together. The two operation mode is switched by buck-boost converter.The main work is to design the regulating scheme for charge, discharge, buck-boost under different conditions. The output of wind turbine will change in frequency and voltage, which depend upon the rotor speed and load capacity. When battery is full charged and AC load is working, the system controller should regulate the power obtain from the wind turbine to suit the need of load, at the same time the voltage supply to the inverter should maintain at a constant value, in order to maintain the output voltage of the inverter.The difference of output voltage of inverter and 220V is set as control signal, controller change the PWM signal to regulate buck-boost converter and three-phase rectifier. PI regulation is adopted in system control.For the sake of meeting rising need of load, system should perform Maximum Power Point Tracking control. For given cells the charge current...