Frequency Control of Islanded Multi-Microgrids Under Different Disturbances

Abstract

The intermittent nature of renewable energy sources, solar and wind, may affect the system dynamic performance and stability. Operation of an isolated hybrid micro-grid (HMG) system requires frequency regulating as well as the voltage. The frequency and power generation control in a power system is usually referred to as a load frequency control. In this paper, the biomass power plant is the main balancing mechanism of the proposed hybrid micro-grid. Speed governor of biomass power plant is implemented using both conventional proportional-integral- derivative (PID) and Proportional-Integral-Derivative-Acceleration (PIDA) based controllers to track system uncertainties and enhancing the performance of HMG. Atom search optimization (ASO) is applied to fine tune the proposed PID and PIDA controllers by minimizing the integral of time multiplied absolute error (ITAE). The proposed HMG and its controllers are applied and tested in the MATLAB/Simulink based simulation environment. In this paper, PID and the PIDA controller have been compared between them to notice the fluctuation behavior of frequency under various system uncertainties scenarios, it is concluded that the PIDA controller scheme provides more reliable system frequency than conventional PID controller.