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摘要
This paper presents the design of control circuit based on digital logic functions for a solar Photovoltaic (PV) fed Cascaded Multilevel Inverter in order to reduce the number of semiconductor switches and also to improve power quality. The proposed control circuit is used to achieve the maximum number of output voltage levels without the requirement of transformers, boost choppers, and complicated look up tables. The multilevel inverter is implemented with asymmetrical DC sources from solar PV to get 2(ns+1)-1 levels, where ns is the number of inverter stages. In conventional multilevel inverter, it requires n DC sources or n number of transformers for 2ns + 1 level. Hence to obtain a 15 level inverter, the proposed method requires 12 switches whereas in conventional method it requires 28 switches. The advantage of this method is the reduction of Total Harmonic Distortion in a renewable energy system. Simulations are carried out in MATLAB/Simulink for various levels of multilevel inverter. The mathematical modeling of the solar panel is also introduced which has the same rating as that of hardware setup. The proposed method is implemented in a 3 kWp solar plant and the performance parameters are measured and compared with the conventional inverters.
- 出版日期2014-1
