Optimal multisine probing signal design for power system electromechanical mode estimation

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Perić, Vedran S. ; Bombois, Xavier ; Vanfretti, Luigi:
Optimal multisine probing signal design for power system electromechanical mode estimation.
In: Proceedings of the 50th Hawaii International Conference on System Sciences. - Waikoloa Village, Hawaii , 2017 . - S. 3156-3164

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Abstract

This paper proposes a methodology for the design of a probing signal used for power system electromechanical mode estimation. Firstly, it is shown that probing mode estimation accuracy depends solely on the probing signal’s power spectrum and not on a specific time-domain realization. A relationship between the probing power spectrum and the accuracy of the mode estimation is used to determine a multisine probing signal by solving an optimization problem. The objective function is defined as a weighting sum of the probing signal variance and the level of the system disturbance caused by the probing. A desired level of the mode estimation accuracy is set as a constraint. The proposed methodology is demonstrated through simulations using the KTH Nordic 32 power system model.