Development of modified carrier based PWM scheme for single phase H-bridge inverter fed isolated wind-PV systems

The ever increasing demand for conventional energy sources drives society toward the research and development of alternative energy sources such as wind and solar energy. The integration of these energy sources form a hybrid system, is an excellent option for distributed energy applications. The successful implementation of such a hybrid energy system is greatly depend on the design of suitable power electronics and their control, which will help to improve the performance and reliability of the system. This research presents an important aspect of designing a voltage source inverter, using modified carrier pulse width modulation techniques. In this paper, a modified Carrier Pulse Width Modulation technique has been suggested, which uses the conventional sinusoidal reference signal and a semi-sinusoidal carrier for minimizing the Total Harmonic Distortion and to enhance the fundamental output voltage in hybrid system. The simulation has been carried out in MATLAB Simulink to analyze the performance of the proposed technique by means of comparing the fundamental component of Root Mean Square output voltage and Total Harmonic Distortion for different values of modulation index. This simulation results shows that the performance of the voltage source inverter, based on semi-sinusoidal carrier pulse width modulation technique is considerably efficient than the existing pulse width modulation techniques.