【摘要】 为了有效治理全网范围内变压器直流偏磁,提出了基于复杂网络理论的偏磁电流分布关键节点辨别方法。首先,定义了偏磁电流节点贡献度的概念,用以反映变电站节点对与其相连的支路和节点偏磁电流分布的影响程度;其次,定义了直流偏磁治理效应指标,用以衡量关键节点识别的有效性,并提出了基于复杂网络理论的关键变电站识别方法与流程;最后,基于某实际电网的结构与参数构建复杂网络模型,对影响偏磁电流分布的变电站节点重要性进行识别。结果表明了方法的有效性和正确性,可为治理变压器直流偏磁提供有用参考。更多还原

【Abstract】 Identifying the key substation nodes that affect the distribution of the partial-magnetic current in the AC system is very vital to control effectively the transformer DC bias in the whole network.In view of this,a key node identification method based on the complex network theory is proposed.Firstly,the concept of the partial-magnetic current node contribution degree is defined to reflect the influence of substation node on the bias current distribution of the connected branches and nodes.Secondly,the index of DC bias control effect is defined to measure the effectiveness of key node identification,and a critical substation identification method and process based on complex network theory are proposed.Finally,a complex network model is constructed based on the structure and parameters of a real power grid,and the importance of the substation nodes affecting the distribution of DC bias current is distinguished,and the results show that the validity and correctness of the method.Those can provide a useful reference for the treatment of transformer DC bias.更多还原