Voltage Regulation in Distribution Network using Fuzzy Logic Controller

Widespread penetration of Renewable Energy (RE) sources in distribution networks may introduce new technical challenges for the distribution network. These issues include voltage rise, voltage unbalancing, voltage regulation problem, thermal overloading, frequency fluctuation, flicker and harmonics. Consequently, the traditional operation of distribution networks limits the penetration level of RE sources and need to be revised to incorporate new control and protection strategies. In this project, a robust voltage control strategy that is fuzzy logic controller, which takes good use of the distributed energy storage (DES) units, is proposed to enhance the voltage stability and robustness of DC distribution network. The characteristics of AC/DC interface in network are analyzed, and the virtual inertia and capacitance are given to demonstrate the interactive influence of the AC and the DC systems. The control strategy for DES which is located at the AC micro grid or at the network terminal bus is designed based on the interactive characteristics, enabling the DES to respond to both voltage variation of DC network and frequency change of utility AC grid. The proposed comprehensive robust control strategy for DESs at different interfaces features independence of communication as well as enhancement of system robustness, and reduces the impact of DC distribution network on utility AC grid