Improvement of power quality and system performance using energy storage systems

• Main Author: Ho, Peng Leong.
• Other Authors: So Ping Lam
• Format: Final Year Project
• Language: English
• Published: 2009
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Electric power::Production, transmission and distribution
• Online Access: http://hdl.handle.net/10356/16718
• Institution: Nanyang Technological University

Technology evolution, environmental concerns associated with central electric power plants and deregulation of the electric utility industry are providing the opportunity for small distributed generators to become very important in order to satisfy the on – site customer expanding power demand. Microgrid comprises low voltage distribution systems with distributed energy resources, such as solar photovoltaic and wind turbines, together with storage devices. These systems are interconnected to the medium voltage distribution network, but they can be also operated isolated from the main grid. From the customer point of view, microgrids provide both thermal and electricity needs and in addition enhance local reliability, reduce emissions, improve power quality by supporting voltage and reducing voltage dips and potentially lower costs of energy supply. From the utility point of view, application of distributed energy sources can potentially reduce the demand for distribution and transmission facilities. Applications of advanced energy storage systems in distribution systems can benefit both the utilities and customers. Customer-sited systems can minimize the effects of outages and offer other power quality improvements, while storage at substations can provide peaking power as needed. An energy storage system, with its associated voltage source inverters, is capable of rapidly adjusting the amount of energy which is supplied to or absorbed from an ac system. This project aims to study and develop a set of control schemes for the use of energy storage systems in distribution systems. The energy storage systems will not only be used for harmonic filtering and power factor correction, but will also be used for control of active and reactive powers, peak leveling and emergency supplies. The design concept of the battery energy storage system (BESS) is verified through simulation studies and the results obtained are discussed.