利用自适应阈值设置,为基于模块化多电平换流器的高压直流电网提供基于非单元小波变换的保护原理

IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC International Journal of Electrical Power & Energy Systems Pub Date : 2024-11-13 DOI:10.1016/j.ijepes.2024.110352
Farzad Dehghan Marvasti , Ahmad Mirzaei , Reza Bakhshi-Jafarabadi , Marjan Popov
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引用次数: 0

摘要

小波变换因其所需的速度和精度,已被证明是高压直流(HVDC)输电线路保护的有效工具。然而,基于小波变换的保护方法需要在灵敏度和选择性方面进行改进。本文提出了一种具有自适应阈值设置的基于 WT 的新型非单元保护方法。根据改进的时域分析方法,采用线模故障产生的电压行波来识别内部故障。在 PSCAD/EMTDC 中对基于多终端模块化多电平换流器的高压直流电网进行的仿真结果证实,所提出的方法能准确、快速地检测出内部故障,最高可达 850 Ω,即几乎是传统方案的三倍。此外,本文的分析还证明了所提出的方法在噪声环境、相对较低的采样频率和不同大小的限流电感器中的可靠性能。所提出的分析方法的通用性确保了所提出的保护方法可以扩展到更复杂的高压直流电网。
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Non-unit wavelet transform-based protection principle for modular multi-level converter-based HVDC grids using adaptive threshold setting
Wavelet transform has proven to be a capable tool for protection purposes in high voltage direct current (HVDC) transmission lines due to its desired speed and accuracy. However, the need to enhance the WT-based protection methods in terms of sensitivity and selectivity is of interest. This paper proposes a new non-unit WT-based protection method with adaptive threshold setting. According to the improved time-domain analytical approach, line-mode fault-generated voltage traveling wave is adopted to identify the internal faults. The simulation results for a multi-terminal modular multilevel converter-based HVDC grid in PSCAD/EMTDC corroborate accurate and fast internal faults detection of the proposed method, up to 850 Ω, i.e., almost three times larger than conventional schemes. In addition, the reliable performance of the presented method in a noisy environment, using relatively low sampling frequencies, and different sizes of current limiting inductors is demonstrated in the presented analysis. The generality of the presented analytical approach ensures that the proposed protection method can be extended to more complex HVDC grids.
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来源期刊
International Journal of Electrical Power & Energy Systems
International Journal of Electrical Power & Energy Systems 工程技术-工程:电子与电气
CiteScore
12.10
自引率
17.30%
发文量
1022
审稿时长
51 days
期刊介绍: The journal covers theoretical developments in electrical power and energy systems and their applications. The coverage embraces: generation and network planning; reliability; long and short term operation; expert systems; neural networks; object oriented systems; system control centres; database and information systems; stock and parameter estimation; system security and adequacy; network theory, modelling and computation; small and large system dynamics; dynamic model identification; on-line control including load and switching control; protection; distribution systems; energy economics; impact of non-conventional systems; and man-machine interfaces. As well as original research papers, the journal publishes short contributions, book reviews and conference reports. All papers are peer-reviewed by at least two referees.
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