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

Ping Ju, Yongfei Liu, Feng Wu, Fei Dai and Yiping Yu
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Ping Ju: College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
Yongfei Liu: College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
Feng Wu: College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
Fei Dai: Electric Power Dispatching & Controlling Center, State Grid Henan Electric Power Company, Zhengzhou 450052, China
Yiping Yu: College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China

Energies, 2016, vol. 9, issue 7, 1-10

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.

Keywords: power system forced oscillation; random excitation; frequency-domain analysis; power spectral density (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
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