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http://dx.doi.org/10.5370/JEET.2016.11.3.560

Power System Harmonic Estimation Based on Park Transform  

Chen, Ya (School of Electric Power, South China University of Technology)
Ji, Tianyao (School of Electric Power, South China University of Technology)
Li, Mengshi (School of Electric Power, South China University of Technology)
Wu, Qinghua (School of Electric Power, South China University of Technology)
Wang, Xuejian (School of Electric Power, South China University of Technology)
Publication Information
Journal of Electrical Engineering and Technology / v.11, no.3, 2016 , pp. 560-574 More about this Journal
Abstract
This paper presents a novel method for power system harmonic estimation based on the Park transform. The proposed method firstly extends the signal to a group of three-phase signals in a-b-c coordinate. Then, a linear fitting based method is adopted to estimate the fundamental frequency. Afterwards, the Park transform is utilized to convert the three-phase signals from a-b-c coordinate to d-q-0 coordinate. Finally, the amplitude and phase of a harmonic component of interest can be calculated using the d-axis and q-axis components obtained. Simulation studies have been conducted using matrix laboratory (MATLAB) and power system computer aided design/electromagnetic transients including direct current (PSCAD/EMTDC). Simulation studies in MATLAB have considered three scenarios, i.e., no-frequency-deviation scenario, frequency-deviation scenario and the scenario in the presence of inter-harminics. The results have demonstrated that the proposed method achieves very high accuracy in frequency, phase and amplitude estimation under noisy conditions, and suffers little influence of the inter-harmonics. Moreover, comparison studies have proved that the proposed method is superior to FFT and Interpolated FFT with the Hanning Window (IpFFTHW). Finally, a popular case in PSCAD/EMTDC has been employed to further verify the effectiveness of the proposed method.
Keywords
Harmonic estimation; Park transform; FFT; Frequency deviation;
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