Impacts of subsynchronous and supersynchronous frequency components on synchrophasor measurements

Phasor measurement units (PMU) are playing an increasingly important role in power system dynamic security monitoring and control. However, the wide-area deployments of the renewable energy sources and the high voltage direct current (HVDC) transmission bring a large number of inter-harmonics to the...

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Bibliographic Details
Published in:Journal of modern power systems and clean energy 2016-07, Vol.4 (3), p.362-369
Main Authors: LIU, Hao, BI, Tianshu, CHANG, Xiqiang, GUO, Xiaolong, WANG, Lu, CAO, Chuang, YAN, Qing, LI, Jinsong
Format: Article
Language:English
Subjects:
Direct current
Electric power transmission
Electrical Machines and Networks
Energy
Energy Systems
Energy transmission
Frequency
Harmonics
High voltages
Inter-harmonics
Measuring instruments
Monitoring
Phasor measurement units (PMU)
Power Electronics
Protection and Control in Smart Grid
Renewable and Green Energy
Renewable energy source
Renewable energy sources
Security
Special Issue on Wide Area Monitoring
Subsynchronous oscillations
Transmission lines
Transmutation
Wind power
Wiring
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Summary:Phasor measurement units (PMU) are playing an increasingly important role in power system dynamic security monitoring and control. However, the wide-area deployments of the renewable energy sources and the high voltage direct current (HVDC) transmission bring a large number of inter-harmonics to the power grid, which may result in further power system security problems. The impacts of inter-harmonics on synchrophasor measurements are revealed. This paper derives the phasor expressions of the signal, which contains the fundamental component and the inter-harmonics. It is found that the inter-harmonics will lead to the subsynchronous oscillation of the phasor measurements. The frequency transmutation principle between the harmonic and the phasor oscillation is revealed. Then, the field PMU data recorded during a subsynchronous oscillation, which occurred in an area of China with a high concentration of wind farms and HVDC transmission lines, are studied. A geographical wiring diagram with the subsynchronous oscillation distribution depicts the severe consequences of the inter-harmonics. In addition, the correctness of the theoretical derivation and the possibility of the inter-harmonics monitoring are verified.
ISSN:2196-5625
2196-5420
DOI:10.1007/s40565-016-0225-4