Designing a power control strategy in a microgrid using PID / fuzzy controller based on battery energy storage

Abstract

Power stability based on energy storage systems to share the load between distributed generations (DG) in island mode is the main issue in the microgrids (MGs). Stability is an important component in energy management and planning of MG. At the first part of this article, definitions and stability issues classification are presented. In this article, power control based on active power method is analyzed. MG system control due to stability improvement in islanding mode (autonomous mode) after fault occurrence at the upstream network are been studying. In this article, MG included two DG units. These DG units and loads are connected in parallel at the point of common coupling (PCC). In islanding mode, according to violence dependence of system's dynamic to local load changes and stability improvement after fault occurrence, the design of controller algorithm is necessary. In this article, demonstrated that to frequency-load control, one of DG units is master and the other one is slave. Proposed controller based on energy storage system is designed according to load uncertain. In the final section, due to demonstrating the improvement and superior robustness of proposed controller to load dynamic, fault occurrence in system and controller capability in over demand supply and decrease short term produced power, frequency and voltage control by energy storage system. Consider a comparison between classic and proposed controller. Proposed control strategy under two scenarios (load change and fault occurrence) has a good performance. Finally, propose controller superior robustness performance evaluated by MATLAB/Simulink.