Design and analysis of three phase inverter based Solar PV powered single switch Buck-Boost converter with reduced THD for industrial applications

Abstract

In recent times development of economical & feasible eco-friendly renewable source powered power electronic converters have become more attractive in multiple areas such as automotive, house appliances and industrial applications etc., Bucking and boosting of voltage according to the requirement is also much needed. So, this work proposes a solar photovoltaic (SPV) powered single switch buck-boost converter for industrial applications which reduces implementation cost, minimal voltage and current stress across the capacitors and diodes and less switching power losses. The work structure comprises of solar PV source with modified perturbation and observation (P&O) algorithm based maximum power point tracker (MPPT), single switch buck-boost dc-dc converter, battery backup to store excess energy, three phase inverter with sinusoidal pulse width modulation (PWM) to find optimal switching angles for harmonic control and 3 phase (Φ) induction motor load. Along with the proposed single switch buck-boost converter, an EMI input filter is included to investigate the harmonic reduction. It also uses the Fast Fourier Transform (FFT) analysis with the reduction of supply voltage harmonics generated by the 3Φ induction motor drive.The DC link is connected with the VSI (voltage source inverter) and then it is converted to AC to feed the AC load. The VSI is controlled with a new PWM based total harmonic distortion (THD) reduction method. MATLAB/SIMULINK platform is used for performance analysis. This work also presents a steady state analysis of a rectifier-inverter topology. Using the method caled linearization, the dynamic equations of the proposed system is obtained.; The proposed single switch buck-boost topology provides an output voltage and current of 363V, 45.5A DC from 520V, 35A PV array. The proposed converter is employed to run a 3Φ induction motor with the rating of 440V, 15A AC. From the simulation results, it is found that the solar powered single switch buck-boost with MPPT is stable, efficient with minimal losses and less THD with better quality output.