The Power Quality Monitoring Systems in Romanian power grid

Transelectrica is the Romanian Transmission System Operator (TSO) and the Metering Operator of the Wholesale Electricity Market (WEM). It is deploying a nationwide Power Quality Monitoring System (PQMS). The PQMS has been operational since October 2005. The paper presents preliminary measurements results obtained from PQMS. The first part of the paper provides a description of the Power Quality (PQ). According with these regulations, TSO has to monitor the PQ parameters. The second part presents the most important permanently analysis of PQ parameters, in the Points of Common Coupling (PCCs), between TSO and the Distribution Systems Operators, at 110 kV and between TSO and the Eligible Customers (EC), at 220 kV. The third part presents the results from the PQ temporary monitoring system, the propagation of distortions around PCCs, at high voltage levels, measured with the portable PQ instruments. The final part contains conclusions and recommendations for future development.