Energy management system of hybrid power generation with battery energy storage and application to MHS smart grid project

This paper proposes an improved dispatch strategy to Mae Hong Son (MHS) power system. MHS is located in a far north west of Thailand which had encountered the worst electrical power problem for many years. MHS hybrid power generation contains photovoltaic power plant, mini-hydro power plants, diesel power plants and also 115kV and 22kV transmission line which are connected to Chiang Mai power grid. In addition, there is an initiative to increase the capacity of renewable energy sources. In this study, we consider the existing power system of MHS and add more electrical power supplies such as PV generation and battery energy storage. Our dispatch strategy is a multi-objective optimization which aims to minimize the total operating cost and the total CO₂ emission corresponding to MHS hybrid power generation. We formulate the dispatch strategy as a linear program subjected to constraints on hybrid power generation models, battery state of charge, and power balance principle. The numerical results show an improvement on economic and environmental operation of power system in normal mode for dry season and rainy season.