Improving load frequency control through PV contribution in a hybrid generation grid

Photovoltaic systems cause problems for the power network because of uncertainty of their output power. One solution to eliminate these problems is to increase reserve power of conventional power plants in the network, which increases system cost and imposes more stress on power plants. Nowadays, the focus in photovoltaic systems is to extract the maximum power from photovoltaic modules. This action prevents these systems from participating in frequency control. This paper introduces a scheme to involve photovoltaic system in frequency control by considering a fraction of Photovoltaic generated power as reservation. For simulation, a system comprising of thermal, hydro and photovoltaic units is considered to investigate the performance of proposed method. This simulation is done in MATLAB Simulink. Moreover, a modified objective function is designed in order to satisfy desired specifications such as lower overshoot, fast settling time and smaller steady-state error. Out coming Results from simulation revealed that photovoltaic contribution in frequency control can improve network frequency noticeably.