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Control of grid connected solar power systems with interleaved flyback converters

This paper proposes a control system connecting for the grid-connected PV (Photovoltaic) system. The control structure includes two alternating flyback converters, a control unit for connecting PV system to the grid, filter circuits at input and output of the converters. The output voltages of two flyback converters having half sinusoidal wave are is converted to completely sinusoidal wave by unfolding converter with the grid synchronization. This control system monitors the load demand and generated power capacity of PV in order to regulate power getting from the grid. The simulation is carried out bay MATLAB/Simulink. | Phong Tien Le et al Journal of SCIENCE and TECHNOLOGY 127(13): 37 - 42 CONTROL OF GRID-CONNECTED SOLAR POWER SYSTEMS WITH INTERLEAVED FLYBACK CONVERTERS Phong Tien Le*, Huong Thi Mai Nguyen, Hung Tien Nguyen University of Technology – TNU ABSTRACT This paper proposes a control system connecting for the grid-connected PV (Photovoltaic) system. The control structure includes two alternating flyback converters, a control unit for connecting PV system to the grid, filter circuits at input and output of the converters. The output voltages of two flyback converters having half sinusoidal wave are is converted to completely sinusoidal wave by unfolding converter with the grid synchronization. This control system monitors the load demand and generated power capacity of PV in order to regulate power getting from the grid. The simulation is carried out bay MATLAB/Simulink. Keywords: Photovoltaic panel, flyback converter, connecting grid, inverter, regulate power. INTRODUCTION * Electric power from PV is only generated in daylight time having irradiance and stored in batteries to adapt to the load or generated directly to grid by electronic power converters [1-3]. Converters are widely used in many fields that convert DC to AC using electronic power components such as IGBT or MOSFET. With the development of digital microprocessors, more and more converters have high quality, simple structure and low cost [1-4]. There are two different kinds of inverters. The first kind is voltage source inverter and the second kind is current source inverter in which the output current is AC with fixed power factor. For the control of a gridconnected PV power system, we consider a PV panel with a maximum power point tracker (MPPT) to have voltage operating at fixed value. A design of a PV power system is presented in detail in [5]. However, this report was not completed since it still has some missing parts. Hence, this paper is a complementary for [5], in which we will present the .