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Energies 2016, 9(7), 525; doi:10.3390/en9070525

General Forced Oscillations in a Real Power Grid Integrated with Large Scale Wind Power

1,* , 1,2
College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
Research Center for Renewable Energy Generation Engineering of Ministry of Education, Hohai University, Nanjing 210098, China
Electric Power Dispatching & Controlling Center, State Grid Henan Electric Power Company, Zhengzhou 450052, China
Author to whom correspondence should be addressed.
Academic Editor: Gianfranco Chicco
Received: 3 May 2016 / Revised: 24 June 2016 / Accepted: 1 July 2016 / Published: 8 July 2016
(This article belongs to the Special Issue Advances in Power System Operations and Planning)
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According to the monitoring of the wide area measurement system, inter-area oscillations happen more and more frequently in a real power grid of China, which are close to the forced oscillation. Applying the conventional forced oscillation theory, the mechanism of these oscillations cannot be explained well, because the oscillations vary with random amplitude and a narrow frequency band. To explain the mechanism of such oscillations, the general forced oscillation (GFO) mechanism is taken into consideration. The GFO is the power system oscillation excited by the random excitations, such as power fluctuations from renewable power generation. Firstly, properties of the oscillations observed in the real power grid are analyzed. Using the GFO mechanism, the observed oscillations seem to be the GFO caused by some random excitation. Then the variation of the wind power measured in this power gird is found to be the random excitation which may cause the GFO phenomenon. Finally, simulations are carried out and the power spectral density of the simulated oscillation is compared to that of the observed oscillation, and they are similar with each other. The observed oscillation is thus explained well using the GFO mechanism and the GFO phenomenon has now been observed for the first time in real power grids. View Full-Text
Keywords: power system forced oscillation; random excitation; frequency-domain analysis; power spectral density power system forced oscillation; random excitation; frequency-domain analysis; power spectral density

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ju, P.; Liu, Y.; Wu, F.; Dai, F.; Yu, Y. General Forced Oscillations in a Real Power Grid Integrated with Large Scale Wind Power. Energies 2016, 9, 525.

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