The thesis presents an implementation of DC-AC power conversion including the modelling and simulation of single phase inverter. A fixed DC input voltage is supplied to the inverter and a controllable AC output voltage is obtained by adjusting the duty cycle of inverter. The duty cycle variation can be achieved by using PWM control method. Two PWM control strategies are used, i.e. SPWM and square wave signal. The PWM signal is generated by using a microcontroller. The DC input voltage supplied to the inverter can be obtained from renewable energy such as solar energy, where it can be harvested using PV module. The output DC voltages of the PV modules need to be converted into AC form to power up standard AC electrical appliances. However, the output voltage of single PV module is usually low. Conventionally, DC is converted into AC by using a H-Bridge inverter, then filtered and before it is stepped to AC mains level voltage by using a transformer. However, transformer is rather bulky and usually
costly to be built. Instead of using a transformer, the high step up or high gain DC-DC conversion stage are used before it is inverted to AC mains level voltage by H-Bridge. In this thesis, cascaded boost converter is employed to achieve the high voltage conversion gain at lower duty cycle. The prototype was developed and constructed to evaluate the performance of DC-AC conversion stage. The design and simulation of inverter is carried out in PSIM and Proteus software. Based on the simulation analysis, the output voltage, current, harmonic, efficiency are measured and compared to calculation analysis and experimental results.
