Optimal Power Dispatch of Renewable Energy-Based Microgrid with AC/DC Constraints

Abstract

Microgrids (MGs) give solutions for energy management in power systems. It is an important part of the energy system to have a local generation of power from renewable energy sources to meet power demands with high efficiency and minimum operating cost. Optimization architecture of MG for optimal dispatch is established in this paper considering thermal diesel generating units (DGs), wind power generation, and solar photovoltaic units (PVs) as renewable sources of energy and energy storage system (ESS). Considering the islanded operating mode of MG, the system modeling is done in IEEE modified 33-bus system. Injection of renewable energy and localized power generation allows grid operators to meet their energy needs without having to purchase power from the grid. The purpose of this paper is to optimize power allocation of the given system to reduce the cost of operation and have an efficient dispatch of power in MG taking into account renewable power generation and energy storage technology. AC/DC power flow network constraints with renewable and non-renewable energy systems are discussed for each case. A 24-hour time duration analysis is performed on the system, and the results are compared for both AC and DC optimal power flows.