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http://dx.doi.org/10.6113/TKPE.2015.20.1.72

Improved Phase and Harmonic Detection Scheme using Fast Fourier Transform with Minimum Sampling Data under Distorted Grid Voltage  

Kim, Hyun-Sou (Dept. of Electrical and Information Engineering, Seoul National University of Science and Technology)
Kim, Kyeong-Hwa (Dept. of Electrical and Information Engineering, Seoul National University of Science and Technology)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.20, no.1, 2015 , pp. 72-80 More about this Journal
Abstract
In distributed generation systems, a grid-connected inverter should operate with synchronization to grid voltage. Considering that synchronization requires the phase angle of grid voltage, a phase locked loop (PLL) scheme is often used. The synchronous reference frame phase locked loop (SRF-PLL) is generally known to provide reasonable performance under ideal grid voltage. However, this scheme indicates performance degradation under the harmonic distorted or unbalanced grid voltage condition. To overcome this limitation, this paper proposes a phase and harmonic detection method of grid voltage using fast Fourier transform (FFT). To reduce the calculation time of FFT algorithm, minimum sampling data is taken from the voltage measurement to determine the phase angle and the magnitude of harmonic components. An experimental test setup for a grid-connected inverter system has been constructed. By comparative simulations and experiments under various abnormal grid voltage conditions, the proposed scheme has been proven to effectively track the phase angle of the grid voltage.
Keywords
Distorted grid; FFT(Fast Fourier Transform); Minimum sampling; PLL(Phase Locked Loop);
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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