On the design and applications of power buffer systems

• Main Author: Wang, Xiaoyu
• Other Authors: Choi San Shing
• Format: Theses and Dissertations
• Language: English
• Published: 2010
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Power electronics
• Online Access: https://hdl.handle.net/10356/41755
• Institution: Nanyang Technological University

With advanced development of power electronic technologies, power electronic based devices have been found increasingly penetrating the power system. Such devices are normally highly regulated and draw constant power from the utility regardless of upstream conditions. From the system operation point of view, such constant power loads (CPL) show nonlinear dynamic features to the mains grid and may destabilize the system. In worst situations, voltage collapse could occur. Taking these factors into consideration, the negative influence of the power electronic based devices on the power system stability, especially on the voltage stability cannot be ignored any longer. It has attracted interests from researchers in finding solutions to mitigate such unfavorable characteristics in recent years. Power quality issues on the load side have attracted much more attention from customers and utilities over the last few decades. The main reason for that is computerized and power electronic based equipment are increasingly used and these have been critical to successful manufacturing and business applications, such as those in hospitals, air traffic control, financial institutions and other automated processes. These equipment are sensitive to power disturbances since excessive deviations of the supply frequency and voltage, even for a short duration, will lead to unscheduled shutdown of industrial processes or equipment failure, causing substantial financial losses for the end-users. Therefore, power supply quality has to be improved especially under the deregulated conditions. On the generation side, due to the deregulation of the power supply industry and increasing concern on the environment, distributed generation (DG) technologies have gained considerable interest from utilities in recent years.