Abstract
The use of a fast decoup1ed load flow solution method to solve the A.C. power flow problem for contingent outages is presented as an aid to steady state security assessment on a power transmission network. The approximate fast solution is obtained by incorporating the decoupling property, between real power and nodal voltage and between reactive power and transmission angle, in the solution of the systm non-linear equations. This method is significantly more accurate than the DC approximation, and faster by an order of magnitude than the Newton-Raphson method.The program automatically evaluates the effects of all single branch outages, or “contingencies”, on the power system, which makes it applicable for security assessment in system planning and operation.
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