Double loop controller of modular inverter in emergency communication power

In this paper a modular inverter with voltage and current loop controller in emergency communication power application is proposed. For obtaining perfect performance, the inverter adopts two closed-loop controllers. The voltage loop is as the outer loop. The current loop is the inner loop. To effectively eliminate the small value oscillation of the generator, Fuzzy logic based adaptive Proportional Integral Derivative (PID) control strategy is developed according to the voltage error and its change ratio in the voltage loop. The advanced hysteresis current controller and modified Pulse Width Modulate (PWM) method are adopted to decrease the Total Harmonic Distortion (THD) of output voltage. At last, the experimental results show that the proposed inverter has good voltage waveform.