This paper presents a method that is used to determine the coherent bus groups of a system who have similar reactive reserve basins. The differences between this proposed method and another widely accepted voltage stability analysis method will be highlighted in this paper and results obtained from the proposed method will be discussed. This method will be shown to be more efficient and requiring less VQ curve computations. Results obtained from the test systems support the method’s validity. By determining the reactive reserve margin it is possible to determine which generators will have an impact on the maximum permissible loading of a bus and which will not. This information is particularly useful for performing voltage stability analysis
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