NOVEL NONITERATIVE LOAD FLOW FOR VOLTAGE CONTINGENCY ANALYSIS

This paper reports on the development of new linearized AC load flow m odels based on a novel approach. The load flow models have been develo ped based on the principle of linearizing nonlinear power flow equatio ns around complete operating range by minimizing the square and integr al square errors. The new methods involve the direct solution of linea r simultaneous power flow equations and thus are non-iterative in natu re. The performance of the proposed linearized models have been tested on IEEE 14-bus and IEEE 30-bus systems and an 89-bus Indian system fo r analysing both a base case and contingency cases. Their results are compared with the exact load flow and some of the existing approximate load flow solutions. The proposed linearized load flow models are fou nd to be extremely fast and much more accurate, especially for voltage magnitude prediction, than other existing linearized and approximate models. It is envisaged that the new models have great potential for o n-line applications in power system studies and contingency simulation for voltage security evaluation.