Sliding Mode Control for Hybrid Power Sources Micro-grid

Abstract

This paper represents sliding mode control adjustment for a hybrid AC/DC micro-grid. The micro-grid includes photovoltaic (PV), wind energy, diesel generator and dynamic loads. The hybrid micro-grid is capable to be synchronized with the main utility. The load variations may lead to the instability of the micro-grid and it may be out of control. Also, the load variations affect the voltage and the frequency behaviour of the system, to go out of limitations. The Sliding Mode Control (SMC) is proposed and implemented to track the reference voltage considering the system load variations. SMC is targeted to improve power sharing and performance among renewable energy resources. In addition, the sliding mode control can regulate active and reactive power via terminal voltage control, it has an optimal behaviour. Furthermore, it still suitable and robust for micro-grid it ensures power sharing with considering the load variations. The SMC is applied to AC/DC hybrid micro-grid, which consists of PV, wind and diesel power generation sources. It is tested at different location connection. It is connected to PV and wind generator’s inverters separately. It is also connected to the diesel connected bus (the main bus). The simulation results of the overall cases show that the proposed system with the sliding mode controller has satisfied performance and good prediction of the electrical parameter waveforms compared to the system behaviour without sliding mode controller.