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

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 explai...

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Published inEnergies (Basel) Vol. 9; no. 7; p. 525
Main Authors Ju, Ping, Liu, Yongfei, Wu, Feng, Dai, Fei, Yu, Yiping
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2016
Subjects
Alternative energy sources
Electric power
Electricity distribution
Fluctuation
Frequency bands
frequency-domain analysis
Monitoring
Oscillations
power spectral density
power system forced oscillation
Random excitation
Simulation
Software packages
Spectra
Wind power
China
China, People's Rep
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Abstract 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.
AbstractList 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.
Author Liu, Yongfei
Wu, Feng
Dai, Fei
Yu, Yiping
Ju, Ping
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StartPage 525
SubjectTerms Alternative energy sources
Electric power
Electricity distribution
Fluctuation
Frequency bands
frequency-domain analysis
Monitoring
Oscillations
power spectral density
power system forced oscillation
Random excitation
Simulation
Software packages
Spectra
Wind power
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