Improved power quality monitoring through phasor measurement unit data interpretation

The observability needs in future power systems will change radically due to the continuing implementation of renewable energy sources at all voltage levels. Especially in distribution grids new observables will be needed in order to monitor the state of the power system sufficiently and to perform the correct actions for operating the system. In future power systems more measuring sensors including phasor measurement units will be available distributed all over the power system. They can and should be utilized to increase the observability of the power system. In this paper the impact of photovoltaic and wind power production on the voltage unbalance was analyzed. PMU data and NTP-synchronized data from two different MV networks were used. It has been found that PV production has only a minor negative impact on the voltage unbalance whereas the wind power production has a great positive impact. The voltage unbalance factor (VUF) could be a `new' observable for a particular power system condition. Information about the actual injected wind power for a certain grid area could be derived without knowing/measuring the real wind power injection.

[1]  Mattia Marinelli,et al.  Future control architecture and emerging observability needs , 2015, 2015 IEEE 5th International Conference on Power Engineering, Energy and Electrical Drives (POWERENG).

[2]  J. Østergaard,et al.  THE BORNHOLM POWER SYSTEM An overview , 2010 .

[3]  Mario Paolone,et al.  Real-time state estimation of the EPFL-campus medium-voltage grid by using PMUs , 2015, 2015 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT).

[4]  B. Kroposki,et al.  DG Power Quality, Protection, and Reliability Case Studies Report , 2001 .

[5]  Mattia Marinelli,et al.  Identification of observables for future grids - The framework developed in the ELECTRA project , 2015, 2015 IEEE Eindhoven PowerTech.

[6]  Kenneth E. Martin.  Synchrophasor Standards Development - IEEE C37.118 & IEC 61850 , 2011, 2011 44th Hawaii International Conference on System Sciences.

[7]  C. F. Kossack,et al.  Rank Correlation Methods , 1949 .

[8]  James S. Thorp,et al.  IEEE Standard for Synchrophasors for Power Systems , 1998 .

[9]  E. Caamaño-Martín,et al.  Interaction Between Photovoltaic Distributed Generation and Electricity Networks , 2008 .

[10]  Ramesh C. Bansal,et al.  A Novel Approach Toward Interpretation and Application of Voltage Unbalance Factor , 2007, IEEE Transactions on Industrial Electronics.

[11]  P. Latha,et al.  Analysis of power quality problems in grid connected wind power plant , 2011, 2011 INTERNATIONAL CONFERENCE ON RECENT ADVANCEMENTS IN ELECTRICAL, ELECTRONICS AND CONTROL ENGINEERING.