A Non-Unit Line Protection Scheme for MMC-MTDC Grids Based on Aerial-Mode Voltage Traveling Waves

Shuo Zhang, G. Zou, Chunhua Xu, Chenjun Sun
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引用次数: 1

Abstract

The line protection of modular multilevel converter (MMC)-based multiterminal direct current (MTDC) grids must detect and locate the faulty line within a few milliseconds after the fault occurs, which is greatly different from the protection of alternative current (AC) systems and traditional line commutated converter (LCC)-HVDC systems. Therefore, a new line protection principle suitable for MMC-MTDC grids must be proposed. The propagation characteristics of voltage traveling waves after DC line faults was first analyzed in this paper. Then, according to the fault transient characteristics of MMC-MTDC grids and the inherent composition of the primary equipment, this paper proposed a novel single-ended faulty line identification principle based on the aerial-mode voltage on the current-limiting inductor at the line terminal and a reliable faulty pole selection method. Besides, the corresponding line protection scheme was designed. Finally, a meshed four-terminal MMC-MTDC grid simulation model was built in PSCAD/EMTDC software to verify the feasibility of the protection scheme. Simulation results show that the proposed protection scheme can identify faulty lines with high speed and sensitivity.
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基于航模电压行波的MMC-MTDC电网非单元线路保护方案
基于模块化多电平变换器(MMC)的多终端直流(MTDC)电网的线路保护必须在故障发生后几毫秒内检测并定位故障线路,这与交流(AC)系统和传统的线路换流变换器(LCC)-高压直流系统的保护有很大的不同。因此,必须提出一种适用于MMC-MTDC电网的新型线路保护原理。本文首先分析了直流线路故障后电压行波的传播特性。然后,根据MMC-MTDC电网的故障暂态特征和一次设备的固有组成,提出了一种基于线路末端限流电感上空模电压的单端故障线路识别原理和可靠的故障选极方法。并设计了相应的线路保护方案。最后,在PSCAD/EMTDC软件中建立了四端MMC-MTDC网格仿真模型,验证了保护方案的可行性。仿真结果表明,该保护方案能够快速、灵敏地识别故障线路。
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