Frequency control of an island microgrid using reset control method in the presence of renewable sources and parametric uncertainty

In recent years, several powerful control methods have been proposed. One of these methods is the reset control, simple nonlinear control technique very effective for plants subjected to fundamental design limitations, and this paper suggests its implementation for secondary control of the frequency of an island microgrid. The studied microgrid includes various elements such as renewable energy sources and various factors such as the load changes, power fluctuations from renewable energy sources, dynamic disturbances as well as parametric uncertainties affecting the frequency of the grid and the complexity of its control. To overcome the above effects and stabilize the network frequency, this paper uses the reset control method to regulate the network operating frequency. Using the proposed controller, the behaviour of the network under parametric changes and different disturbances has been investigated and compared with conventional and optimized PID control methods. High speed frequency regulatory and low undershot/overshot are some of the advantages of the proposed method. The simulation results show the desired performance of the proposed control method in stabilizing the network frequency under different scenarios.