Simulation and Analysis of Three Phase 7-level Hybrid Switched Capacitor Unit Based Multi-level Inverter

Haldia Institute of Technology,Haldia, W.B., India Numerous industrial applications have begun to require higher power apparatus in recent years. Some medium voltage motor drives and utility applications require medium voltage and megawatt power level. For a medium voltage grid, it is troublesome to connect only one power semiconductor switch directly. As a result, a multilevel power converter structure has been introduced as an alternative in high power and medium voltage situations. A multilevel converter not only achieves high power ratings, but also enables the use of renewable energy sources. Renewable energy sources such as photovoltaic, wind, and fuel cells can be easily interfaced to a multilevel converter system for a high power application. In this transaction a three phase 7 level hybrid switched capacitor unit based multilevel inverter topology is proposed. The inverter consists of three switched capacitor unit and a three phase two level voltage source inverter. In this proposed topology higher level of line voltage using less number of switches can be achieved. Thus switching loss will be lesser and efficiency will be higher. The said topology is simulated in MATLAB/SIMULINK using multi carrier based pulse width modulation and obtained the desired result