Centralized Secondary Control Assessment of Microgrids with Battery and Diesel Generator

The microgrids are considered a solution for the integration of distributed and renewable energy resources in the distribution network. A microgrid can operate either connected to a main grid or islanded. When the microgrid operates in islanded mode the voltage and frequency control is performed through the primary and secondary control. Primary control is responsible for ensuring the stable operation of distributed generations. Secondary control is responsible for frequency and voltage adjustment, usually this control is accomplished through PI control. In this context, this paper aims to evaluate the centralized secondary control for a microgrid that can operate with two generation sources in this control, a diesel generator and a battery storage. Simulations are performed on the Matlab/Simulink platform in order to evaluate the adjustment of the controllers. Three cases are evaluated, which differ in relation to the source or sources that participate in the primary and secondary controls. The results show that for each case the controller settings must be different.