Abstract:
This paper proposes a new circuit configuration and a control scheme for a single-phase current source inverter with load variation. Different operational modes of this inverter are depicted. A sine-triangular wave pulse width modulation SPWM technique is applied. The inverter is implemented using a single boost switch, an H-bridge inverter, and a CLC output filter. The switching angle of the inverter is optimized through PWM shifting angle. The triggering signals of the each of the power switch are generated from comparing sinusoidal wave as the reference of 50Hz frequency with triangular wave as carrier signal of 40 MHz frequency. Waveform analysis has been detailed to obtain the harmonic amplitude of the output current. This paper reveals that proposed single phase current source inverter operates with different loads generates variable percentages of THD with constant modulation index of 0.9 and very high frequency modulation ratio according to carrier signal frequency. The simulations have been done in LabVIEW software to showcase the harmonic spectrum, output voltages and currents waveforms. Discrete simulated values of proposed CSI parameters are processed and converted into continuous functions using Matlab Platform. From the simulated results, the output current THD is around 1.72%. In addition, the output power factor over of 99% and a maximum efficiency over 95% are obtained.
