Inter-harmonics monitoring method based on PMUs

More and more inter-harmonics are brought to the power grid due to the integration of renewables and the wide-area deployments of the electronic devices. This may lead to the exacerbation power system stability problems such as the subsynchronous oscillation in western China. The synchronisation and...

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Bibliographic Details
Published in:IET generation, transmission & distribution transmission & distribution, 2017-12, Vol.11 (18), p.4414-4421
Main Authors: Liu, Hao, Bi, Tianshu, Li, Jue, Xu, Sudi, Yang, Qixun
Format: Article
Language:English
Subjects:
electronic devices
harmonic analysis
instantaneous powers
inter‐harmonic analysis
inter‐harmonics monitoring method
phasor angle
phasor magnitude
phasor measurement
phasor measurement units
PMUs
power grid
power grids
power system harmonics
power system stability
renewable integration
Special Issue: New Trends in Wide-Area Monitoring and Control of Power Systems with Large Scale Renewables
subsynchronous oscillation
synchronisation
western China
wide‐area measurement system
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Summary:More and more inter-harmonics are brought to the power grid due to the integration of renewables and the wide-area deployments of the electronic devices. This may lead to the exacerbation power system stability problems such as the subsynchronous oscillation in western China. The synchronisation and high-reporting rates of phasor measurement units (PMUs) make them an effective tool to monitor the appearance, propagation and distribution of inter-harmonics for protection and control strategies. In this study, the instantaneous powers of the single phase and the three phase that contain inter-harmonics are analysed. The phasor value of the signal containing the inter-harmonics is computed. It is found that the analysis based on the instantaneous power, phasor magnitude or phasor angle cannot distinguish whether the harmonic is subsynchronous or supersynchronous. Then, an inter-harmonics monitoring method that is based on complex numbers of phasor measured by PMUs is proposed in this study. This proposed method has been implemented in the main station of the wide-area measurement system in western China. A number of field data events are used to verify the correctness of the theoretical derivations.
ISSN:1751-8687
1751-8695
1751-8695
DOI:10.1049/iet-gtd.2017.0375