A Partial Discharge Testing System Based on A 5-Level Converter with Different Control Signals

N. Yomkaew, N. Marukatat, P. Yutthagowith
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引用次数: 3

Abstract

In this paper, analyses of a partial discharge (PD) testing systems using a voltage source from a 5-level converter with different control signals are presented. The low voltage source with 200 Hz of the test system is generated using the 5-level converter. The converter connected to a high voltage transformer, a partial discharge detection. The LC-filter type is set for the test system. The efficiency of voltage source from the 5-level converter with different control signal topologies, i.e. 5-level square wave, 5-level quasi-square wave, and 5-level sinusoidal pulse width modulation (SPWM) with modulation index (ma) of 1.0. The effect of the topologies to partial discharge test system is presented and compared in cases of the voltage difference, total harmonic distortion (THDv) of the output voltage, and the background noises in the partial discharge testing system with no-load and load test with a potential transformer (PT). It is found that the 5-level sinusoidal pulse width modulation (SPWM) with modulation index 1.0 provides the best performance in cases of the voltage difference and THDv of below 5%, and the background noise of below 2.5 pC.
基于不同控制信号的5电平变换器局部放电测试系统
本文分析了采用不同控制信号的5电平变换器电压源的局部放电(PD)测试系统。测试系统的200hz低压源是用5电平变换器产生的。将变流器接在高压互感器上,进行局部放电检测。为测试系统设置LC-filter类型。不同控制信号拓扑的5电平变换器电压源效率,即5电平方波、5电平准方波和调制指数(ma)为1.0的5电平正弦脉宽调制(SPWM)。介绍了拓扑结构对局部放电测试系统的影响,并比较了空载和带电位互感器的局部放电测试系统的电压差、输出电压的总谐波失真(THDv)和背景噪声。研究发现,在电压差小于5%、THDv小于5%、背景噪声小于2.5 pC的情况下,调制指数为1.0的5级正弦脉宽调制(SPWM)具有最佳的性能。
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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