Design of Three Phase Inverter System with LC filter

Abstract

Three phase inverter is extremely important electronic module utilized in modern industry. most the induction motor drives use inverter for desired controlled output. Inverters are also utilized in various sectors like high voltage (HV), heating, uninterrupted power supply (UPS), induction motor drives, textile mills, electric vehicles, home appliances and energy system. Amongst the numerous Pulse Width Modulation (PWM) techniques employed in variable speed frequency drives multiple step pulse width modulation is simple to device and popular PWM technique employed in industries today. it has been established that with constant parameters of this control loop and also the employment of a nonlinear reactor, the inductance of which depends on the amplitude of the inverter current, the energy losses within the inverter switches increase several times or the harmonics composition of the load current deteriorates significantly. In accordance with this, it's proposed to change the coefficient of proportional link of this control loop per the amplitude of the inverter current reference. At low values of the load current, the modulation frequency increasing is desirable. The structure of the system with a corresponding change within the parameters of this control loop within the case of employing a non-linear reactor is proposed. The MATLAB Simulink of the “three-phase inverter” was performed with a linear and non-linear reactor with an estimate of the power losses within the inverter switches.