Results of power quality monitoring in Romanian transmission and distribution system operators

Two types of Power Quality Monitoring Systems (PQMSs) - one for TSO and other for DSOs, in accordance with Performance standards and Technical Codes of the Romanian Energy Regulation Authority - ANRE were published. The connection to the grid of the renewable sources could determine the increasing of the emissivity of perturbations and the necessity of the propagation study in order to determine the level of the perturbation to the superior level of the voltage of network. The concept “One system for all PQ data” is a new direction used by TSO and DSOs for increasing the efficiency of the PQMS. The results of the monitoring using PQMS for a long period of time, in this paper, validated the expectations from the feasibility study in the design stage of PQMS and allowed the authors to look at some improvement directions of the system. The integration of PQMS with other systems - DMS, SCADA, DFR has been already solved in DSO and a higher efficiency has been achieved. The whole measurement chain in power distribution and transmission activities has been taken into consideration and the results have a good accuracy. Few recommendations are included in the paper. The final part of the paper contains the authors conclusions on issues addressed in it.