Fuzzy-Based Voltage Sag Enhancement of Grid Connected Hybrid Pv-Wind Power System Using Battery and SMEs Based Dynamic Voltage Restorer

The micro grid (MG), if properly designed and with an efficient control system, is a platform for the development of distributed and renewable energy-based products. Because MG inertia is low due to its small structure and low resistance to change, it is very difficult to maintain frequency and voltage stability, especially in the island state. Unlike the power grid, inverter-based distributed generation is the main source of MGs. Due to the low response rate of primary energy sources in distributed generation, these productions, even if they have an efficient control system, alone cannot maintain MG stability, so by using electrical energy storage sources and D-STATCOM along with distributed generation, in This research proposes an interactive and multilevel structure for voltage and MG frequency stability. This structure greatly speeds up the MG response to perturbations through an interactive control system. The proposed structure has been implemented and evaluated by MATLAB software on MGs that can be used in both connection and island modes in the presence of a renewable wind source.