Load frequency control of a photovoltaic-pumped hydro power energy storagebased micro-grid System

A renewable energy micro-grid (REMG) based on pumped hydropower energy storage (PHES) is designed to provide an increasing load demand. Micro-pump storage units (MPSUs) are constructed to be used as energy storage system to improve power quality and safe reactive power supply. Frequency variation and tie-line power exchange arose due to mismatch between load and generation is constantly measured. To maintain system stability Load frequency control (LFC) is studied. An LFC controller based on Fractional Order (FO) PI for two-areas in the REMG is proposed. An optimization of the controller is done with Firefly Optimization Algorithm (FOA). Study system is performed in MATLAB using Simulink platform and simulation results are examined in details. Results show that proposed technique gives better responses as that of classical PI controller.