500kV混合直流断路器快速机械开关动态电压平衡的理论研究

Yifan Qin, Kaihua Long, Wei Cai, Dangguo Xu, Hao Jiang, Dawei Yang, Zhaowei Peng, Lingru Ning
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引用次数: 0

摘要

500kV高压直流断路器(HVDC CB)主支路采用多路快速机械开关串联结构,要求有效距离在2ms以内,并能承受过电压。因此,对动态电压平衡和同步特性提出了更高的要求。本文分析了500kV高压直流断路器的动作特性和主路快速机械开关的受力情况。建立了500kV高压直流断路器的快速机械开关模型,提取了分布电容参数。研究了多开关串联结构的电压均衡措施。建议电压平衡电容可为65nF,阻尼电阻可为200Ω,电压平衡电阻可为200MΩ。探讨了快速机械开关在运行雷电冲击作用下不同运行时段的电压分布,探讨了冗余丢失情况下的同步要求。间隔不应超过0.17ms。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Theoretical Study on Dynamic Voltage Balancing of Fast Mechanical Switches in 500kV Hybrid HVDC Circuit-Breaker
The main branch of 500kV high-voltage DC circuit-breaker (HVDC CB) adopts a series structure of multiple fast mechanical switches, which requires an effective distance within 2ms and can withstand over-voltage. Therefore, higher requirements on the dynamic voltage balancing and synchronization characteristics are put forward. In this paper, the action characteristics of 500kV HVDC CB and the stress of fast mechanical switches in main branch are analyzed. A model of fast mechanical switches in 500kV HVDC CB is built, and the distributed capacitance parameters are extracted. The voltage equalization measures of multi-switch series structure are studied. It is suggested that the voltage balancing capacitance can be 65nF, the damping resistance can be 200Ω, and the voltage balancing resistance can be 200MΩ. The voltage distribution of fast mechanical switches in different periods of operation is explored under operation lightning impulse (OLI), and the requirement of synchronization in the case of loss of redundancy is explored. The interval should not exceed 0.17ms.
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