混合式DC断路器与组合式HVDC断路器的对比分析
Comparative Analysis of Hybrid DC Breaker and Assembly HVDC Breaker
摘要：
电压源换流器（VSC）在现代高压直流（HVDC）输电系统中变得越来越普遍。多端VSCHVDC的主要挑战之一是对DC侧故障的保护。两个主要的设计，即混合直流断路器和组装高压直流断路器，比较的操作行为，操作速度和载流能力。利用双模块冗余（DMR）技术进行故障场景的决策。当一个结果与另一个结果相矛盾时，它使用双重投票系统。这有助于为两种类型的断路器的操作设计故障安全机制。电流阈值结合方向变化被认为是断路器操作。在PSCAD/EMTDC中设计了一个三端双极型VSC HVDC系统，并利用仿真结果对两种不同直流断路器设计进行了比较。
英文摘要：
Voltage Source Converters (VSC) are becoming more common in modern High Voltage DC (HVDC) transmission systems. One of the major challenges in a multi-terminal VSCHVDC is protection against DC side faults. Two major designs, namely, the hybrid DC breaker and the assembly HVDC breaker, are compared for operational behavior, speed of operation and current carrying capability. The Dual Modular Redundancy (DMR) technique is utilized for decision making of a fault scenario. This uses a dual voting system when one result contradicts the other. This helps in the design of a fail-safe mechanism for the operation of both types of breakers. Current threshold combined with directional change is considered for the breaker operation. A three-terminal bipolar VSC HVDC system is designed in PSCAD/EMTDC and simulation results are utilized to draw a comparison of the two different designs of DC breakers.
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