Partial Discharge Behavior of Typical Defects in Power Equipment under Multilevel Staircase Voltage

Journal article (2022)

Authors

Y. Zang Shanghai Jiao Tong University

M. Ghaffarian Niasar DC systems, Energy conversion & Storage -

D.A. Ganeshpure DC systems, Energy conversion & Storage -

Yong Qian Shanghai Jiao Tong University

Gehao Sheng Shanghai Jiao Tong University

Xiuchen Jiang Shanghai Jiao Tong University

P.T.M. Vaessen DC systems, Energy conversion & Storage -

Research Group

DC systems, Energy conversion & Storage () (TU Delft)

DOI: https://doi.org/10.1109/TDEI.2022.3185567

Stress Electric fields Discharges (electric) Partial discharges Voltage Behavioral sciences Modular multilevel converter (MMC) Multilevel staircase voltage Needles Partial discharge (PD) mechanism Phase-resolved partial discharge (PRPD) Typical defects

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Published Date

2022

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

With the widespread application of power electronic switching technology, power equipment is facing new electrical stresses brought about by multilevel staircase voltages during testing and operation. Therefore, the partial discharge (PD) behavior of five typical defects in power equipment under the staircase waveform needs to be investigated. This article mainly analyses the phase-resolved PD (PRPD) pattern and pulse repetition rate (PRR) of five typical defects under sinusoidal voltage and multilevel staircase voltage with different number of levels. Also, the PD behavior under staircase voltage with different step responses are investigated. By analyzing the reasons behind the PD behavior between different cases, the PD characteristics and the transformation of PRPD patterns under different staircase voltages are obtained. Moreover, this research finds that the sensitivity of different defects to the staircase voltage is different. These results provide experimental and theoretical support for the testing and diagnosis of PD under new electrical stress present in the future flexible electric grid.

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