Fault protection is a major issue in the development of multiterminal high‐voltage direct current (HVDC) system based on voltage‐source converter. Owing to the rapid increase in fault current under DC faults, protection requires a fast fault detection method to isolate the fault current. However, the selectivity and reliability of the fast protection scheme should be primarily guaranteed. Therefore, a new protection strategy based on modulus maximum under wavelet transform is proposed in this paper. Fault detection and discrimination are achieved using single‐end signals of fault current. The external and internal faults can be discriminated via local information. The reliability and robustness of the proposed scheme against potential factors are verified. Numerous simulation cases are performed in PSCAD/EMTDC under different fault scenarios, and signal data are analyzed in MATLAB to demonstrate the effectiveness of the proposed fault protection scheme. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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基于小波变换模极大值的多端高压直流输电系统保护方案

故障保护是基于电压源转换器的多端子高压直流（HVDC）系统开发中的主要问题。由于直流故障下故障电流的迅速增加，保护需要一种快速的故障检测方法来隔离故障电流。但是，应首先保证快速保护方案的选择性和可靠性。因此，本文提出了一种基于小波变换模最大的保护策略。使用故障电流的单端信号可以实现故障检测和判别。外部和内部故障可以通过本地信息进行区分。验证了所提方案针对潜在因素的可靠性和鲁棒性。在PSCAD / EMTDC中，在不同的故障情况下，会执行许多模拟案例，在MATLAB中对信号数据进行了分析，以证明所提出的故障保护方案的有效性。©2020日本电气工程师学会。由Wiley Periodicals LLC发布。