Model Predictive Control of a Three Phase Four Leg LC Filtered Inverter: Reduction of Manufacturing Cost and Simplification of Working Processes

Abstract

A four-leg inverter is generally used to give power to three-phase loads at various conditions like balanced, unbalanced, light loads, heavy loads, etc., and also under the condition of source. Again a four-leg inverter gives three independent voltages with an extra neutral leg. An LC filter is used to make the output more precise and accurate for making the inverter compatible to connect with the grid system. Normally a traditional LC filtered inverter using finite set model predictive control needs both inductor current and capacitor voltage measurement. That makes the inverter bulkier and rises the manufacturing cost. So, in this paper, we have formulated a sensor-less technique for the four-leg LC filtered inverter with a resistive load only which eliminates the current sensors of the system and thus reduces the manufacturing cost of the inverter and simplifies its working process.