Fuzzy Logic Controller based Energy Storage System for Micro Grids Integration

Abstract

This project proposes a fuzzy based for HESS micro grids integration for power quality improvement. The system incorporates clean energy generation along with power quality improvement thus increasing functionality of the system. Rising demand for distributed generation based on Renewable Energy Sources (RES) has led to several issues in the operation of utility grids. The microgrid is a promising solution to solve these problems. A dedicated energy storage system could contribute to a better integration of RES into the microgrid by smoothing the renewable resource’s intermittency, improving the quality of the injected power and enabling additional services like voltage and frequency regulation. However, due to energy/power technological limitations, it is often necessary to use Hybrid Energy Storage Systems (HESS).In this paper the use of a 4-Leg 3L-NPC power converter topology to interface a RES with a HESS (formed by a VRB and a Li-Ion battery) in a microgrid context has been investigated. A new model of the structural limits is presented and implemented to exploit the entire capability of the 4-Leg 3L-NPC converter to insure a maximum power division between the two ESS. A non-linear 2-SMC scheme has been designed and tuned to control the zero sequence injection in the modulating signals in order to control the power flow of the HESS. Simulation and experimental results proved the capacity of the proposed control strategy to manage a HESS in order to improve the power quality and stability as well as to control the renewable energy injected into a microgrid. The investigation of the limits of the topology showed a power exchange capability among this fuzzy enables its application to control in conditions of distorted voltages. The proposed method is verified by simulating the system in Matlab 2013a Simulink with combination of linear and nonlinear loads.