Partial Discharge Measurements under DC Voltages Containing Harmonics Produced by Power Electronic Devices

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI:10.1109/CEIDP.2018.8544850

P. Romano, A. Parastar, A. Imburgia, J. Blennow, M. Bongiorno, A. D. Di Tommaso, T. Hammarström, Y. Serdyuk

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引用次数: 13

Abstract

Partial Discharge (PD) monitoring is one of the main diagnostic instrument to evaluate the reliability of modern electrical transmission and distribution systems. The widespread use of High voltage dc (HVDC) connections increase the demand of voltage source converters (VSCs) which, as a consequence, has brought about new challenges in the field of partial discharge measurements. In fact, the output voltage waveforms generated by AC/DC modular multilevel converters (MMCs) are affected by a significant harmonic content which influences the Partial Discharges (PDs) activity. For this reason, previous research mainly investigated the PD phenomenon on the AC side of the converter. The aim of the present work was to evaluate the PDs behavior applying a voltage waveform containing ripple at the DC side of the converter. At first, a pure DC voltage has been used to stress the tested specimen and then harmonic content has been added by chancing the number of modules of the simulated AC/DC converter. For the different generated waveforms, measurements of PDs have been carried out and a comparison of the different PDs pattern have been made. The effect on the PDs behavior has been also evaluated for different switching frequencies.

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电力电子设备产生的含谐波直流电压下的局部放电测量

局部放电监测是评价现代输配电系统可靠性的主要诊断手段之一。高压直流(HVDC)连接的广泛使用增加了对电压源变换器(VSCs)的需求，从而给局部放电测量领域带来了新的挑战。事实上，交/直流模块化多电平变换器(MMCs)产生的输出电压波形受到谐波含量的显著影响，谐波含量会影响局部放电(PDs)的活性。因此，以往的研究主要是对变换器交流侧的局部放电现象进行研究。本工作的目的是在变换器的直流侧应用包含纹波的电压波形来评估PDs的行为。首先用纯直流电压对试样施加应力，然后通过改变模拟交/直流变换器的模块数来增加谐波含量。对于不同的生成波形，进行了PDs的测量，并对不同的PDs模式进行了比较。在不同的开关频率下，对PDs行为的影响也进行了评估。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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