Fuzzy-Logic Based Frequency Controller for Wind Farms Augmented With Energy Storage and PV Systems

Abstract

To improve the primary frequency response in future low-inertia hybrid power system a fuzzy<br />logic based frequency controller (FFC) for wind farms augmented with energy storage systems<br />(wind-storage system) and intelligent PV farms for the frequency stabilization is proposed in<br />this paper. Using system frequency deviations the proposed controller provides bidirectional<br />real power injection and rate of change of frequency (RoCoF). Displacement of conventional<br />synchronous generators by non-inertial units such as wind or solar generators will result in<br />reduced-system inertia affecting under-frequency response. Frequency control is important to<br />avoid equipment damage, load shedding, and possible blackouts. To improve the frequency<br />response of low-inertia power system Wind generators along with energy storage systems can<br />be used. Moreover, FFC ensures optimal use of energy from wind farms and storage units by<br />eliminating the inflexible de-loading of wind energy and minimizing the required storage<br />capacity. The efficacy of the proposed FFC is verified by using the simulation results on the<br />low-inertia hybrid power system.