Power Control of Three-phase PWM Rectifier for Microturbine

Microturbine generator system is one of the most promising distributed generation systems because it is small, efficient and mobile. When it is running, the high-frequency alternating current of permanent magnet synchronous generator generating must be rectified and inverted into 50Hz AC to meet the user requirements. Normally, the diode rectifier is used. When we need to regulate voltage, the DC/DC converter is applied and the generator current is distorted and the power factor is low. Therefore, PWM rectifier is utilized to regulate voltage and power factor based on power control scheme. In microturbine system, the maximum frequency is 1200Hz and active power is severely impacted by the term of reactive power, so as to make DC link voltage unstable. We use feedforward scheme to automatically compensate for active power changing, so a stable DC link voltage and high power factor can be achieved. The results of simulation and experiment show that the proposed scheme is effective and practicable.