Abstract
In this paper, an improvement of the adjoint network (AN) method based on the Tellegen theorem for calculation of power system variables following various contingencies is presented. A new model of PV nodes is developed and the response of PV nodes to line as well as generator outages is modelled accordingly. Furthermore, an improved computational scheme is derived that enables a fast single step evaluation of post contingency power system variables. Example cases of test and practical systems show that the improved adjoint network (IAN) method offers an efficient tool for on-line contingency analysis due to its improved accuracy and computational effort in comparison with the widely accepted 1 PI Q approach based on fast decoupled powerflow (FDPF).
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