电压不平衡度的加窗FFT快速测量方法

doi:10.19595/j.cnki.1000-6753.tces.141348

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Abstract The voltage unbalance factor (VUF) is one of the most important parameters of power quality. The measurement of VUF depends on both the precise estimation of voltage phasors and the fast calculation of the magnitude of the zero, positive, and negative sequences. However, the accuracy of voltage phasors estimation is affected by the spectrum leakage and picket fence effect, and the measurement speed of VUF is limited because of the square root operation in the calculation of phase sequences. In this paper, a fast measurement method of voltage unbalance factor based on windowed interpolation fast Fourier transform (FFT) was presented. Firstly, windowed interpolation FFT was applied to calculate the voltage phasors. Then, the square root operation in the calculation of phase sequences was transformed into polynomial operation based on the geometric partitions. The simulation results show that the proposed method could achieve the same level of accuracy with the method recommended by GB/T 15543—2008. The measured results from the experiments of VUF verify the effective and practicability of the proposed method in further.

Key words： Voltage unbalance factor (VUF) voltage phasor phase sequence windowed FFT polynomial

Received: 25 October 2016 Published: 30 August 2017

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TM71

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	Wen He
	Jin Ran
	Meng Juan
	Li Fuhai

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Wen He,Jin Ran,Meng Juan等. Fast Measurement Method of Voltage Unbalance Factor Based on Windowed FFT[J]. Transactions of China Electrotechnical Society, 2017, 32(16): 275-283.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.141348 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I16/275

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