Integration of renewable source with non -ideal grid conditions using new converter control

Abstract

This paper presents the distributed sparce based voltage source converter (VSC) control for three-phase grid tied inverters interfacing distributed renewable resources (DERs) into the power grid. An uncertainty and disturbance modelling based control law is developed for achieving the robustness against nonideal grid conditions including the grid impedance variations, grid voltage harmonics and fluctuations in grid voltage magnitude (symmetrical/ asymmetrical), frequency and phase. The distributed sparce control performs multitasks. It feeds the generated solar PV power to the local three phase grid. It reduces the harmonics of loads and furnished a balanced current of local three-phase grid. The distributed sparce control uses a solar PV array, a voltage source converter, a nonlinear load, a three-phase grid, DC-link capacitance.  By Using this distributed sparce control, extract maximum power condition from PV system with single stage converter, so number of power electronic components reduced.  For extracting maximum power from the PV source, the traditional P&O (Perturb and Observe) scheme is utilized here. The tracking performance and efficiency of P&O technique, are also examined here at rapid changing climatic conditions to show behavior of P&O scheme. The distributed sparce control approach is capable to estimate required fundamental component to find out reference grid currents.