Generalised transformer modelling for power flow calculation in multi-phase unbalanced networks
Generalised transformer modelling for power flow calculation in multi-phase unbalanced networks
复制标题
多相不平衡网络潮流计算的广义变压器建模
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. Turri
中科院分区：
文献类型：
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作者：
M. Coppo;F. Bignucolo;R. Turri
低压系统是不平衡的网络，大部分用户是单相连接的，因此需要考虑多相系统，以评估不同相位的相互影响。单相不均匀用户的存在，会导致三相潮流的不平衡。考虑到本地单相发电机的存在，这个问题得到了强调。本研究提出了一种在任何多导体电网表示中进行变压器建模的通用方法，以便对低压配电系统等不平衡网络进行分析。该方法基于关联矩阵法，在已知各单相等效电路阻抗的情况下，可以表示任何涉及相间相互连接的网络对象。一些应用实例验证了该方法的有效性，并说明了该模型的数值实现方法。
Low voltage systems are unbalanced networks where a significant share of the users is single-phase connected, so a multi-phase system needs to be considered in order to assess the mutual influence of the different phases. The presence of single-phase unevenly distributed users, leads to unbalances in the power flow on the three phases. This issue is emphasised considering the presence of local single-phase generators. This study presents a generalised method for transformers modelling in any multi-conductor grid representation in order to allow the analysis on unbalanced networks such as low-voltage distribution systems. The method, based on an incidence matrix approach, is proposed to represent any network object involving mutual connections among the phases, once the impedances for each single-phase equivalent circuit are known. Some application examples validate the approach and illustrate how to numerically realise the model.