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Diagnostics of Reactive Power Flow in a Power Network

The paper deals with reactive power flow in a power network. One of more essential problems in a power network is a problem of excessive reactive power flows. That problem can be solved by installation of additional sources of reactive power in a power network. With such the solution of the mentioned problem there is associated the following question: Which buses should be considered for installation of additional sources of reactive power? That question can be replaced by the following one: At which buses are there bus reactive powers having the largest impact on reactive power flow in the power network? The paper presents original answer to that question. Using investigation of correlational relationships between bus reactive powers and reactive power flows on branches, the proposed method enables to find the seeked bus reactive powers. In the paper, after theoretical background is outlined, the principle of the new method is given. Next, the case study for reactive power flow in the IEEE 14-bus test system is described. The most important features of the presented method are gathered at the end of the paper.