SINGLE PHASE PWM INVERTER WITH CURRENT MINOR CONTROL LOOP

This paper proposes a single phase sinusoidal voltage inverter with current minor loop using high speed switching devices such as Bi-MOS or IGBT. Following new methods are successfully combined and adopted to get high performance: (a) A high speed current minor control loop is given for the Inverter to constrain inverter current within SOA of switching devices, and as the reference of this current loop, following signals are given to get sinusoidal output voltage. (1) Current for the parallel element of the output filter (ii) Feedforward of the load current (iii) Voltage adjusting and stabilizing signal which is the output of voltage controller (b) Micro processor control using the dead beat algorithm is developed for sinusoidal output voltage Inverter. This system consists of two dead beat controllers for current and voltage. By using the dead beat control, the inverter current and the output voltage settle with one sampling period.