Economic dispatch for multi heat-electric energy source based microgrid

Abstract

Microgrids (MGs) provide solutions to various problems in power systems by integrating non-renewable and renewable energy sources like combined heat and power (CHP) plants and distributed energy resources (DER). This paper has developed an optimization framework for economic dispatch of microgrids, including heat storage tanks and to increase the flexibility of CHP plants and boiler units. In addition, conventional power generators, intermittent energy resources such as photovoltaic (PV) units, wind turbines and battery energy storage system (BESS) are modelled in a modified IEEE 33 bus test system MG operating in islanded mode. Local generation and DER penetration can help system operators to satisfy energy demands with no need to purchase power from the grid. The main goal of the proposed paper is to optimally and economically dispatch heat and electricity considering impacts of heat buffer tank and battery energy storage, taking into account the technical constraints like AC/DC power flow limitations and the effects of dual dependency of produced heat and power by CHP units. The MG is studied within a time horizon of 24 hours and obtained results are analyzed for comparison.