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Energies 2018, 11(4), 753; https://doi.org/10.3390/en11040753

Reliability Equivalence to Symmetrical UHVDC Transmission Systems Considering Redundant Structure Configuration

College of Electric Engineering, Zhejiang University, Hangzhou 310027, China
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Received: 15 February 2018 / Revised: 14 March 2018 / Accepted: 22 March 2018 / Published: 26 March 2018
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Abstract

In recent years, the ultra-high voltage direct current (UHVDC) transmission system has been developed rapidly for its significant long-distance, high-capacity and low-loss properties. Equipment failures and overall outages of the UHVDC system have increasingly vital influence on the power supply of the receiving end grid. To improve the reliability level of UHVDC systems, a quantitative selection and configuration approach of redundant structures is proposed in this paper, which is based on multi-state reliability equivalence. Specifically, considering the symmetry characteristic of an UHVDC system, a state space model is established as a monopole rather than a bipole, which effectively reduces the state space dimensions to be considered by deducing the reliability merging operator of two poles. Considering the standby effect of AC filters and the recovery effect of converter units, the number of available converter units and corresponding probability are expressed with in universal generating function (UGF) form. Then, a sensitivity analysis is performed to quantify the impact of component reliability parameters on system reliability and determine the most specific devices that should be configured in the redundant structure. Finally, a cost-benefit analysis is utilized to help determine the optimal scheme of redundant devices. Case studies are conducted to demonstrate the effectiveness and accuracy of the proposed method. Based on the numerical results, configuring a set of redundant transformers is indicated to be of the greatest significance to improve the reliability level of UHVDC transmission systems. View Full-Text
Keywords: UHVDC transmission system; reliability equivalence; sensitivity analysis; redundant configure configuration UHVDC transmission system; reliability equivalence; sensitivity analysis; redundant configure configuration
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Jiang, X.; Ye, C.; Ding, Y.; Guo, R. Reliability Equivalence to Symmetrical UHVDC Transmission Systems Considering Redundant Structure Configuration. Energies 2018, 11, 753.

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