Interfacing transient stability and extended harmonic domain for dynamic harmonic analysis of power systems

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This study presents a novel methodology for steady and dynamic states harmonic analysis of power systems. It employs a decomposition framework so that harmonic-producing devices are considered as separate subsystems which are solved via the extended harmonic domain (EHD) technique. The EHD is inherently a frequency domain dependent solution method that provides dynamic harmonic indices based on operational matrices. The remaining system is modeled and resolved via commonly used harmonic analysis methods while transient stability (TS) is conducted (at fundamental frequency) to account for dynamic behavior of generators and controllers. Interfacing of EHD and TS solutions is performed via an iterative scheme. As for steady-state initialization, an efficient and robust algorithm is proposed in this study. The proposed method is implemented in an existing software package and applied to IEEE 9-bus test system. A thorough comparison of the proposed method with the PSCAD/EMTDC software tool is also presented.

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