基于连续过渡模型的直流真空断路器弧后介质恢复分析

发布时间：2018-01-08 01:15

本文关键词：基于连续过渡模型的直流真空断路器弧后介质恢复分析　出处：《真空科学与技术学报》2014年12期 　论文类型：期刊论文

【摘要】：搭建多端直流输电用直流真空断路器模块,基于连续过渡模型,结合重击穿判据,利用变步长四阶龙格库塔法,对直流真空断路器弧后介质恢复进行仿真分析。仿真结果表明:弧后电流初始变化率高,而后缓慢变化,直至趋近于零;在鞘层发展阶段中,鞘层厚度呈指数趋势变化。采用对照分析方法,研究燃弧能量、触头电侵蚀率及触头间纵向磁场强度对直流真空断路器弧后介质恢复的影响。结果表明:燃弧能量大,触头电侵蚀率高使得弧后初始离子密度大,离子衰减时间长,鞘层发展缓慢;弧前触头间纵向磁场强度大,弧后初始离子密度小,有利于鞘层发展;剩余纵向磁场强度大,离子衰减时间长,抑制鞘层发展。
[Abstract]:The module of HVDC vacuum circuit breaker for multi-terminal HVDC transmission is built. Based on the continuous transition model, combined with the criterion of re-breakdown, the fourth order Runge-Kutta method with variable step size is used. The simulation analysis of back-arc dielectric recovery of DC vacuum circuit breaker shows that the initial change rate of back-arc current is high and then slowly changes until it approaches to zero. In the development stage of sheath, the thickness of sheath changes exponentially. The influence of contact electric erosion rate and longitudinal magnetic field intensity between contacts on the recovery of back arc medium of DC vacuum circuit breaker. The results show that the initial ion density is high because of high arc energy and high contact erosion rate. The ion decay time is long and the sheath develops slowly. The longitudinal magnetic field between the front arc contacts is large and the initial ion density behind the arc is small, which is beneficial to the development of sheath. The residual longitudinal magnetic field is large, the ion attenuation time is long, and the sheath development is restrained.
【作者单位】：沈阳工业大学电气工程学院;大连理工大学电气工程学院;
【基金】：国家自然科学基金重点基金项目(No.51337001);国家自然科学基金项目(No.51377106)
【分类号】：TM561.2
【正文快照】： 鉴于风能、太阳能等新能源间歇、随机的发电特点,其并网难度大,电力系统消纳能力有限,因而大部分可再生能源发电未得到充分、有效利用[1]。基于常规直流输电和柔性直流输电的多端直流输电系统与直流电网技术是解决这一问题的有效技术手段之一[2-3]。而直流断路器技术是构建多

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