Partial Discharge Characteristics of Polyimide Under the High-Frequency Multilevel Stepped Waveform

IF 3.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-27 DOI:10.1109/TDEI.2024.3469157

Ruitao Shao;Jun Jiang;Wu Chen;Zhibang Shen

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Abstract

High-power high-voltage high-frequency transformers (H3Ts) have been widely applied in the modular multilevel converter (MMC) due to their high efficiency and flexibility. However, the special electric stress for the insulation is introduced into this type of power converter, that is the high-frequency multilevel stepped waveform stresses generated by the converter’s switching actions. Therefore, it is important to investigate partial discharge (PD) characteristics in H3Ts under the stepped waveform. This article analyses the influence of frequency and voltage level numbers on the PD initial voltage (PDIV) and time-resolved PD (TRPD). Experimental results indicate that PDIV shows a decreasing trend within the frequency range of 10–100 kHz. Moreover, it is observed that the five-level stepped waveform results in a 50% reduction in PD numbers at 10 kHz when compared to the two-level stepped waveform. The space charge movement during platform time induces the production of PD, which is shown as two peaks on the TRPD pattern. These results provide experimental and theoretical support for the diagnosis of PD under MMC stepped waveforms for the application in H3Ts.

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聚酰亚胺在高频多级阶梯波形下的局部放电特性

大功率高压高频变压器（H3T）因其高效率和灵活性而被广泛应用于模块化多电平转换器（MMC）中。然而，这种电源转换器会引入特殊的绝缘电应力，即转换器开关动作产生的高频多电平阶跃波形应力。因此，研究 H3T 在阶跃波形下的局部放电 (PD) 特性非常重要。本文分析了频率和电压水平数对局部放电初始电压（PDIV）和时间分辨局部放电（TRPD）的影响。实验结果表明，在 10-100 kHz 的频率范围内，PDIV 呈下降趋势。此外，与两电平阶跃波形相比，五电平阶跃波形在 10 kHz 时使 PD 数减少了 50%。平台时间内的空间电荷运动诱发了 PD 的产生，在 TRPD 图案上显示为两个峰值。这些结果为 H3T 应用中 MMC 阶跃波形下的 PD 诊断提供了实验和理论支持。

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来源期刊

IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程：电子与电气

CiteScore

6.00

自引率

22.60%

发文量

309

审稿时长

5.2 months

期刊介绍： Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.

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