基幹系統における不平衡電流発生メカニズムの検討

抄録

By treating a power system as balanced, it becomes easy to do load flow calculation, transient stability calculation and nominal rating calculation of power system apparatus. So, most of conventional analysis and apparatus design have been done on the premise that the power system is balanced. Recent years, however, the long heavily loaded untransposed transmission lines and large unbalanced loads have led to an increase in the unbalanced components of a power system. Hence, the influence of negative sequence components on different power system apparatus caused by the unbalance is of concern to power utility.
The authors investigate a mechanism of unbalance current flow and voltage distribution in a trunk power system by converting unbalance components caused in a transmission line to zero sequence component and negative sequence component. This paper also shows a verification using a model power system.