Dual Mode Control Of Grid Connected Solar Converters

Abstract

In this thesis,dual mode control is proposed for input DC voltage regulation and an interior point convex optimization ,quadratic programming algorithm is used to predict optimal switching func- tions for all sectors of three phase inverter.It is done by minimizing a cost function de ned for suppressing harmonics in output at every interval of sampling frequency.Optimized inputs are further used to generate a reference voltage signal,which is used for generating gate pulses of two level three phase inverter by Space vector modulation method.Discrete time model is used with grid connected load sys- tem for model predictive control.q-Pll and conventional Pll schemes are brie y discussed in this thesis.Quadrature q-PLL is used for synchronization with utility grid.Simulation are carried out in Mat- lab to evaluate viability of controllers implemented.Results from simulations tell how much MPC-SVPWM technique is superior in performance than other linear conventional voltage source inverter techniques like sinusoidal PWM and SVPWM technique.