一种半波长交流输电潜供电流主动抑制措施及其原理性验证

An Active Suppression Technique of Secondary Arc Current of Half-wavelength Alternating Current Transmission and Its Theory Verification

半波长交流输电技术因其自身的特点具有较好的经济性,然而潜供电流的问题限制了半波长交流输电技术的发展和应用。为了解决这一问题,介绍了潜供电流产生的机理,对现有的中性点并联小电抗法和沿线加装高速接地开关法在半波长交流输电系统中的应用进行了比较分析,发现两种方案均存在不足。研究了半波长交流输电潜供电流的特性,并在此基础上提出了潜供电流的主动抑制措施。最后,在PSCAD/EMTDC仿真平台对主动抑制措施的原理进行仿真验证。结果表明该措施可以有效地抑制半波长交流输电的潜供电流,加快熄弧速度,提高系统的故障恢复效率。

Half-wavelength AC transmission（HWACT） possessed economic advantages due to its characteristics.However,the problem of secondary is current limiting the development and application of HWACT.In order to solve the problem,firstly,a brief introduction of generation of secondary arc current is given.Then the performance of two existing techniques of normal lines is compared and analysed in HWACT,including neutral reactors and high speed grounding switches（HSGS）,both of these two techniques have drawbacks.In addition,the characteristics of secondary arc current in HWACT are studied,based on which the active suppression technique is proposed.Finally,simulation of active suppression theory is carried out in PSCAD/EMTDC.The results show that the proposed technique can limit secondary arc current in HWACT,and speed up the arc extinction and improve the system＇s fault recovery efficiency.