A method for reduction of power system transient model

An electromagnetic transient study of a power system requires modeling of complicated transmission networks. To date, modeling the details of a full system requires so great an amount of computer memory and computation time that it is an impossible task. Therefore in these studies, usually just a small portion of the power system is modeled in detail and the rest of system is presented by a simple equivalent circuit based on short circuit studies. Sometimes, a relatively better equivalent model by application of the line´s surge impedance in parallel with the short circuit impedance is employed. Although the last model increases the accuracy of the first reflections, it does not provide accurate results for low frequencies, and therefore the steady state response is not valid. Over the last decade, many reduction techniques have been employed for power system transient studies, however great effort is still employed to develop a simple, general and robust method for the reduction of a power system transient model. This paper develops a new method based on reduction of system discrete equations in the Z-domain, and building equivalent RLC networks to represent the transfer functions in single and multi port models. This model is validated and its computation time is reduced