Monitoring System for Japan Western 60-Hz Power System Based on Multiple Synchronized Phasor Measurements

摘要

The Japan Western 60-Hz System consists of six major electric power companies. Due to its longitudinal structure, there are some significant oscillation modes represented by Jong-term oscillation in the whole system. Independent load frequency control based on Tie-Line Bias control (TBC) has been adopted by each company. Also, some independent power producers are participating in the power generation business. Under these circumstances, the system may show some interesting dynamics. So far, some oscillatory characteristics have been measured in an individual company's own area or in the interconnecting tie lines. However, there was little observation in the power system as a whole. In this paper the authors present a global system for monitoring of power system dynamics using the synchronized phasor measurement technique at some universities located in the 60-Hz power system. Phasor measurements are synchronized based on the global positioning system (GPS) and measured data are transmitted via the Internet. Some oscillatory features and variations of pha-sors in 1 day, 1 week, or 1 year are analyzed using the acquired data.