一种限流式混合直流断路器方案

发布时间：2018-11-11 19:02

【摘要】：直流输电与交流输电相比,具有线损低、不存在系统同步运行稳定性问题等一系列优点。近年来,随着电压源型高压变流器等技术的迅速发展,柔性多端高压直流输电系统、直流输配电网以及直流断路器等关键技术与装备的研究受到了国内外的高度重视。文中简要阐述了机械式、全固态与混合式3类直流断路器的拓扑结构、工作原理、优缺点及国内外研究现状,指出高压直流断路器应以混合式为主要发展方向;提出一种限流式混合直流断路器方案并仿真验证了其可行性,该方案采用全/半控器件串联构成固态开关再与机械开关并联的混合开关结构及故障限流技术,可有效抑制直流短路电流上升率,降低故障判断灵敏性与机械开关速动性的要求,减少高压应用场合下固态开关器件的串联数量(特别是绝缘栅双极型晶体管等价格昂贵的全控型器件),从而降低装置工程化实现的技术难度及其体积与成本。
[Abstract]:Compared with AC transmission, DC transmission has a series of advantages, such as low line loss, no system synchronous operation stability and so on. In recent years, with the rapid development of voltage source type high voltage converter and other technologies, the research of flexible multi-terminal HVDC transmission system, DC transmission and distribution network, DC circuit breaker and other key technologies and equipment has received great attention at home and abroad. This paper briefly describes the topology, working principle, advantages and disadvantages of mechanical, all-solid and hybrid DC circuit breakers, and points out that hybrid type should be the main developing direction of HVDC circuit breakers. A limited current hybrid DC circuit breaker scheme is proposed and its feasibility is verified by simulation. The scheme adopts hybrid switch structure and fault current limiting technology, which is composed of solid state switch and parallel mechanical switch in series with full / half control device. It can effectively restrain the rise rate of DC short circuit current and reduce the requirement of fault judgement sensitivity and mechanical switch rapidity. In order to reduce the number of solid-state switching devices in series (especially the expensive full-control devices such as insulated gate bipolar transistors) in high-voltage applications, the technical difficulty, volume and cost of the device engineering are reduced.
【作者单位】：浙江大学电气工程学院;深圳供电局有限公司;
【基金】：国家高技术研究发展计划(863计划)资助项目(2013AA050103)~~
【分类号】：TM561

【参考文献】