Integrated controller for T-source inverter based photovoltaic power conversion system

Abstract

This paper deals with the design and simulation of integrated controller for T-source inverter (TSI) based photovoltaic (PV) power conversion system. Photovoltaic (PV) module can generate direct current electricity without environmental impact and contamination when is exposed to solar radiation. Due to non linear characteristics of PV modules, which results in unique maximum power-voltage curve, it depends on the irradiation and temperature. So it needs to track the maximum power with help of maximum power point tracking (MPPT) controller. Here the Incremental conductance (INC) algorithm is used to reduce the oscillations in steady state, improve the tracking accuracy, fast response speed. The DC link controller is used to sense the dc link voltage value and compares it with the reference value of capacitor voltage and changes the reference current correspondingly. Here DC link controller and MPPT controller are unified and produce a shoot through ratio and improve the response time of MPPT controller. Due to integrated controller the settling time is reduced. The pulses are generated for the switches of the T-source inverter. T-source inverter has advantages over Z-source inverter fewer reactive components, high voltage gain and reduces the voltage stress across the switches. The modified space vector pulse width modulation is used to reduce the harmonic distortion and to prevent unnecessary switching in the device. Integrated controller for T-source inverter based photovoltaic power conversion system is simulated using MATLAB/Simulink.