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Energies 2018, 11(2), 261; https://doi.org/10.3390/en11020261

Novel Detection Method for Consecutive DC Commutation Failure Based on Daubechies Wavelet with 2nd-Order Vanishing Moments

1
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
2
State Grid Beijing Electric Power Company, Beijing 100031, China
*
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 11 January 2018 / Accepted: 16 January 2018 / Published: 23 January 2018
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Abstract

Accurate detection and effective control strategy of commutation failure (CF) of high voltage direct current (HVDC) are of great significance for keeping the safe and stable operations of the hybrid power grid. At first, a novel detection method for consecutive CF is proposed. Concretely, the 2nd and higher orders’ derivative values of direct current are summarized as the core to judge CF by analyzing the physical characteristics of the direct current waveform of the converter station in CF. Then, the Daubechies wavelet coefficient that can represent the 2nd and higher order derivative values of direct current is derived. Once the wavelet coefficients of the sampling points are detected to exceed the threshold, the occurrence of CF is confirmed. Furthermore, by instantly increasing advanced firing angle β in the inverter side, an additional emergency control strategy to prevent subsequent CF is proposed. Eventually, with simulations of the benchmark model, the effectiveness and superiorities of the proposed detection method and additional control strategy in accuracy and rapidity are verified. View Full-Text
Keywords: HVDC; consecutive commutation failure; Daubechies wavelet; 2nd-order vanishing moments; wavelet coefficient HVDC; consecutive commutation failure; Daubechies wavelet; 2nd-order vanishing moments; wavelet coefficient
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lin, T.; Guo, Z.; Wang, L.; Chen, R.; Bi, R. Novel Detection Method for Consecutive DC Commutation Failure Based on Daubechies Wavelet with 2nd-Order Vanishing Moments. Energies 2018, 11, 261.

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