Optimum Design of an Electrolytic Capacitor-less Grid-tied Solar Microinverter

Document Type : Original Article


Department of Electrical Engineering, Faculty of Electrical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran


This paper studies two types of functions for single state Solar Micro Inverter connected to a network without Electrolyte Capacitor: Continuous and Discontinues. In order to recognize the advantages of both functions and to develop the Inverter for Photovoltaic applications connected to a decentralized network; those two functions are analysed and compared.The purpose of the optimum design of these structures is a micro-inverter with the smallest possible volume to deliver maximum power to the electricity network and extensive utilization of photovoltaic energy. Using electrolyte capacitor in usual structures of Micro-Inverter circuits will lead to decrease in life span of circuits. In order to remove electrolytic capacitor, circuit analysis methods can be used for energy storage. Using the Inverter function in boundary state led to decrease in tensions imposed on Inverter’s components compared to Discontinues state. Results of simulation in PSIM confirm the accuracy of analysis and designs done for 100 (W) Inverter with input DC voltage of 27 (V) and rms voltage 100 (V).