A Novel Control Approach for Microgrids Islanded Operation - Load Step Pre-announcement and Bang-Bang Control

In terms of high penetration of distributed energy resources, power systems undergo challenges on aspects of their operation, stability and control issues. Microgrids gained a lot of research interest because they have a promising future to integrate the distributed energy resources into the power systems, reduce greenhouse gas emissions and increase the reliability and security of the power systems. Frequency control is an important control method applied in power systems. In this paper, an islanded microgrid implementing frequency control is modeled. Furthermore, a novel control method including load step preannouncement and bang-bang control is used together with frequency control and some dynamic simulation results of the islanded microgrid are presented. It compares the results among systems with different starting time constants, control schemes and shares of photovoltaics. It also analyzes whether the implementation of load step pre-announcement and bang-bang controller is feasible and useful.