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电网技术  2014 

交直流配电网可靠性对比

DOI: 10.13335/j.1000-3673.pst.2014.09.042, PP. 2582-2589

Keywords: 柔性直流配电网,交流配电网,可靠性对比,最小割集,直流断路器,直流变压器,直流负荷比例

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Abstract:

为探索高可靠性配电网的发展方向,首次就中压柔性直流配电网的可靠性进行深入研究。建立了换流站、直流变压器和直流断路器的可靠性模型,考虑直流负荷、备用电源和分布式电源的影响,对最小割集法进行改进使其同时适用于交、直流配电网的可靠性评估。以“手拉手”环状网络为例,对比了现有技术条件下交、直流配电网的可靠性。研究表明,现阶段直流配电网的可靠性低于交流配电网;随着直流负荷比例的增大,直流配电网可靠性将得到提高,但效果有限;直流断路器和直流变压器的高故障率才是制约现阶段直流配电网可靠性提高的关键因素。随着电力电子元件的发展,直流配电网的可靠性将逐步接近甚至超越交流配电网。

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