Development of power quality monitoring system with central processing scheme

Power quality monitoring system is the cornerstone of power quality analysis, diagnosis and improvement. Power quality (PQ) measurement concepts are evolving from instantaneous metering to continuous monitoring and developments in measurement technology make PQ monitoring system more powerful. That is, now it is possible to construct a more flexible, reliable, fast and economical PQ monitoring system. This paper presents an improved PQ monitoring system with central processing scheme. The proposed system basically consists of one PQ analyzer and multiple PQ meters. PQ meter only acts as raw data acquisition system and PQ analyzer performs all calculations and analysis algorithm. The proposed system is very economical especially for large-scale system because the price of PQ meter can be dramatically lowered in this scheme. PQ monitoring algorithms to catch steady-state trends and to detect PQ events are also proposed. The prototype of this system is constructed and real-time tests are performed using this system.