Modulated Hysteresis Current Control of a Grid Connected Photovoltaic System
power electronics in power grids (from mobile phones to smart power grids)
In this paper a control of a photovoltaic system connected to the grid is presented. The main components of the studied system are solar arrays connected through a DC bus to a grid side inverter. Due to the instantaneous changing of solar irradiance and temperature, maximum power point tracking (MPPT) is integrated in the inverter control. The energy generated by the grid photovoltaic system is sent to the power grid. This is accomplished through an efficient DC/AC conversion where the MPPT is integrated in the inverter control which ensures the control of the active and reactive power level injected to the grid. To overcome undesirable drawbacks of hysteresis current control, and to obtain a constant switching frequency, in this paper we applied a modulated hysteresis control. The simulation results under Matlab/Simulink show the control performance of grid connected photovoltaic system.
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