Abstract
This paper reports on the development of new linearized AC load flow models based on a novel approach. The load flow models have been developed based on the principle of linearizing nonlinear power flow equations around complete operating range by minimizing the square and integral square errors. The new methods involve the direct solution of linear simultaneous power flow equations and thus are non-iterative in nature. 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 finanal 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 found 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 on-line applications in power system studies and contingency simulation for voltage security evaluation.
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