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Intelligent Multi-Functional Fault Current Limiter
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DOI：10.1109/TSG.2023.3325469.png)
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摘要
En 中文
This paper proposes an intelligent multi-functional fault current limiter (IMFCL) designed for protection against bidirectional faults using an almost lossless fault energy strategy in medium-voltage applications. The proposed circuit incorporates a symmetrical double-sided combination of a voltage source converter (VSC), isolating transformers, and bidirectional switches. The design allows both series and shunt configurations for the transformers, enabling protection for both, downstream and upstream sides of a network. Moreover, the structure can also function as a dynamic voltage restorer (DVR) or even as a unified power quality coordinator (UPQC) and unified power flow controller (UPFC), addressing additional power quality issues in the grid. The control segment employs the maximal overlap discrete wavelet packet transform (MODWPT) for time-frequency analysis, leveraging it to estimate the network's impedance and pinpoint the fault's location and nature. To this end, an interharmonic high-frequency signal is fed into the grid using VSCs, facilitating swift downstream or upstream impedance determination in FCL or DVR modes. Additionally, a new algorithm is deployed to simultaneously measure both voltage and current magnitudes, determining fault type or voltage sag/swell occurrences in real-time. Simulation and Real-time hardware-in-the-loop (HIL) results substantiate the proposed IMFCL's feasibility and efficacy.
Keyword:
Fault current limiter (FCL)
intelligent multi-functional FCL (IMFCL)
dynamic voltage restorer (DVR)
grid impedance
power quality
impedance estimation
FACTS
protection
wavelet transform
期刊
IF:
9.8
论文数:
5.7K
被引数:
4.3W
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引用论文
Operations and Coordination of Dual-Functional DVR and Recloser in a Power Distribution System.png)
IEEE ACCESS
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