Comparative Analysis of Harmonic Distortion of a Solar PV Fed Cascaded H-bridge Multilevel Inverter Controlled by FPGA and Diode Clamped Inverter

Abstract

Background/Objectives: Multilevel Inverters are growing technology, even there are many topologies available in real world, here new multilevel topologies such as diode clamped multilevel inverter and cascaded-H-bridge inverter are discussed and comparative results for lower total harmonic distortion are analysed. Methods/Statistical Analysis: Neutral point diode clamped inverter is analysed and its total harmonic distortion value is calculated. Cascaded H-Bridge (CHB) 7 level inverter is analysed and then simulated, finally it is verified using FPGA controller. Three H-bridges are seriously connected to produce 7 level output voltage, FPGA controller uses Sinusoidal Pulse Width Modulation (SPWM) to produce pulse pattern for H-bridges. Results: This topology is tested in Matlab/Simulink environment. Total Harmonic Distortion (T.H.D) value of 7 level voltages is seen as a 30.33%. Which is very low as compared with 3 phase diode clamped five level inverter (81.7%). Conclusion/Application: Solar Photo Voltaic system is employed to compete the disadvantages of conventional energy sources and resulted in energy conservation system that reduces power consumption.