模块级联多端口混合式直流断路器研究

Modular Cascaded Multi-port DC Circuit Breaker for DC Grid Application

高压直流断路器是解决多端及直流电网故障快速隔离的有效方式,近年来发展迅速,国际上完成了多种技术路线样机开发与工程应用。混合式高压直流断路器是当前主流技术路线,因采用大量全控器件,利用率低、成本较高,制约了其在直流电网中规模化应用。该文针对直流电网中多直流出线应用场景,基于模块级联技术提出一种多端口混合式直流断路器拓扑,阐述其在典型系统故障工况下动作原理,完成核心部件电气应力数值分析与设计,仿真研究所提方案在四端直流电网应用性能,完成与现有技术对比分析,论证所提出多端口组合开断方法可行性与实用性,为高压直流断路器技术经济性能提升提供解决方法,推动高压直流断路器在直流电网中更为广泛应用。

High-voltage DC circuit breakers(DCCB)are an effective way to solve the rapid isolation of multi-terminal and DC grid faults.It has developed rapidly worldwide in recent years and has completed prototype development and applications based on different technical routes.Hybrid high-voltage DC circuit breakers have become the mainstream technology route,but its large-scale application in DC grids is still restricted due to the large number of full-controlled devices,low utilization and high cost.This paper proposes a hybrid multi-port DC circuit breaker(MP_DCCB)topology based on the module cascaded technology for the DC grid multiple lines application.Then the operation principle under typical system fault conditions is expounded,and mathematical analysis and design of the core components electrical stresses is completed.Simulation study on the application performance of the proposed topology in the four-terminal DC grid is carried out,and completes the comparative analysis with the existing technology.The research results demonstrate the feasibility and practicability of the proposed multi-port topology,which provides a solution for the technical and economic performance improvement of high-voltage DCCB and promotes the wider application of high-voltage DCCB in DC grids.