Modelling, Simulation and Control of Utility Grid Integrated Solar Photovoltaic System Using Matlab

ABSTRACT In this paper we are modelling a solar based non-conventional energy generation system using MATLAB software. A 500-KW grid connected PV system in a radial 2-bus test system is modeled and simulated using Matlab/Simulink software to study the effects of this technology on the system under different levels of solar irradiation. PV module with a central three level inverter is developed in the thesis, which is more suitable for medium power applications. However, the output of solar arrays varies due to change of solar irradiation and weather conditions. Therefore, the maximum power point tracking algorithm is implemented in DC/DC converter (Boost converter) to enable PV arrays to operate at maximum power point. The widely used MPPT technique, incremental conductance algorithm is employed to control the boost converter. Then the central three level inverter is controlled by decoupled current (Id, Iq) control algorithm and interfaced with the utility grid via the distribution network. Besides, the current control of the inverter is independent of maximum power point control of the DC/DC converter. Finally, system performance and transient responses are analyzed. And system stability is evaluated when solar irradiation change or system fault happens. The system is simulated in MATLAB.