Analysis of Step-up Operation of Forced Commutated PWM Cycloconverter

This paper proposes the step-up forced commutaled cycloconverter. With input reactors ac power acts as current source, and with output capacitors the ballanced three phase output voltages are built up. The converter is modeled with forth-order state equation using dq transformation and the steady state characteristics are evaluated by the particular solution of the state equation The magnitude of output voltage increases with magnitude of modulation function q and no more increases but decreases above a certain point of q The waveforms of output voltage and input current are sinusoidal and smooth and the magnitude of output voltage can be controlled which is 2-5 times greater than that of input voltage. Simulations and experiments are performed to verify the characteristics of proposed converter and the results match well theoretical analysis.