A METHOD FOR DETECTING POWER SYSTEM DISTURBANCES BASED ON MULTIPLE SYNCHRONIZED PHASOR MEASUREMENTS

摘要

The longitudinal structure of western Japan's 60Hz system is commonly known to produce various system oscillations, such as long term, local generator, and frequency control oscilliations. However, little is known about the widearea phenomenon among systems. This study is part of a larger project to establish a method to analyze power measurements and to clarify the oscillations in power systems. PMUs (PhasorMeasurement Unit) connected to 100V outlets were placed in universities in the 60Hz power system. The PMUs are synchronized based on global positioning system (GPS) and measured data is transmitted via the Internet. In this paper, the technique for clarifying the oscillation in power systems is investigated. This paper describes a method to extract power system disturbances from a huge amount of PMU data. First, the phase difference characteristics between observation points when a power system fault occurs are examined. Then, the proposed method is elaborated and the paper concludes with the application of the proposed method to a huge volume of PMU data.