Abstract

Microgrids are becoming a way of integrating renewable energies, lowering costs and providing better grid quality all around the world. Energy Management Strategies (EMSs) are becoming essential for the power sharing purpose and regulating the microgrids voltage. The classical EMSs track the Maximum Power Points (MPPs) of wind and PV branches independently and rely on batteries, as slack terminals, to absorb any possible excess energy. However, in order to protect batteries from being overcharged by realizing the constant current-constant voltage (IU) charging regime as well as to consider the wind turbine operational constraints, more flexible multivariable and non-linear strategies, equipped with a power curtailment feature, are necessary to control microgrids .The proposed strategies are novel constrained and multivariable Maximum Power Point Trackers (MPPTS) that employ renewable energy systems as flexible generators which means that their generated powers are optimally curtailed, if required, in proportion to their ratings.