Power Management of a Grid Forming Enabled Hybrid Energy System

Abstract

Hybrid power generation systems that combine different renewable energy sources and energy storage systems offer an environmentally friendly alternative to conventional power generators for stand-alone applications. However, the displacement of synchronous generators with inverter-based resources reduces the overall inertia and, hence, the power system's resilience. Also, the intermittency of these renewable resources necessitates the need for additional storage devices to balance the power generated and power demand. This thesis investigates the effectiveness of an active power management strategy in maintaining the stability of a stand-alone power system comprising of a Wind Turbine Generator (WTG), Fuel Cell (FC), Electrolyzer (EZ) and Battery Energy Storage System (BESS). In an islanding mode, the inverter-interfaced resource operates in Grid Forming mode (GFM) while ensuring a power balance between the generation and demand. The proposed scheme was modeled and simulated under different case studies to verify the management strategy using PSCAD/EMTDC.