SUMMARYThis paper presents a method to determine whether an operative voltage control action will have the steadystate expected effect or not. Sensitivity indexes are designed to correlate the controlled voltage with the controlling physical variable in generators, synchronous and static compensators, LTCs and shunt capacitors/reactors. An illustrative numerical example is provided as well as a real life one. The heavily loaded Brazilian system was operating without any problem. However, a small increase in generation caused voltage control devices to work unexpectedly. A harmful interaction among nearby control devices was also noticed.
This paper presents a method to verify the adequacy of voltage control actions in the operation of electrical systems. The assessment is done through a sensitivity matrix, whose characteristics are presented and discussed. The goal is to identify whether the usual logic of voltage controlling equipment is occurring normally or not. It is also verified the resultant effect of the control performed by each controlling device on other buses of the grid with controlled voltage. An analysis based on eigenvalues and eigenvectors, associated to the sensitivity matrix, is applied to the problem.
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