Introduction to converters for renewable energy systems.

DC-DC converters: Buck, boost, buck-boost

Ćuk converters: operation and wave-forms in CCM and DCM. Forward, fly-back and push-pull converter circuits, half bridge, full bridge converters.

Resonant DC-DC converters: operating principle, waveform.

Converter control: PWM, closed loop control, feed forward and current mode control.

Driver circuits: uni-polar, bipolar and isolated drives. Simulation of DC-DC converters with close loop control.

Inverters: Overview, three phase converters, rectifier and inverter modes of operation for RL load.

Inverter Control: PWM inverter modulation strategies, uni-polar and bipolar switching scheme, sine wave PWM, space vector modulation, multi-level inverter – basic topology and waveform, improvement in harmonics. Converters in standalone power systems, Grid connected inverters. Simulation of inverter with different modulation strategies.

Dynamic characteristics of power semiconductor switches: MOSFET, IGBT – switching trajectory and losses.

Snubbers: turn-off and turn-on snubbers.

Magnetic design: inductor and transformer design.

Simulation: Snubber implementation in converter circuits. Laboratory Experiments in above modules