Output voltage control for PWM inverter with electric double layer capacitor as DC power supply

In general, chopper circuits are necessary for the inverter system whose input voltage fluctuates such as solar power energy, wind power energy, capacitor energy and so on. Therefore, the inverter system becomes larger, the energy losses of power converter increase, and control circuit is complicated. In this paper, to overcome these problems, a control scheme of PWM inverter to get the constant R.M.S. AC voltage on inverter output without chopper circuit is proposed. At first, R.M.S. value calculation method and feedback control procedure are investigated to realize proposed system. Next, the simulation results of the system are shown and characteristics of power converter using proposed control scheme are discussed. At last, experimental results of proposed control system using fluctuating voltage source are shown. Finally, availability of the newly developed system is confirmed.