Title :
Online Estimation of Subsynchronous Voltage Components in Power Systems
Author :
Bongiorno, Massimo ; Svensson, Jan ; Angquist, Lennart
Author_Institution :
Chalmers Univ. of Technol., Goteborg
Abstract :
In this paper, the problem of online estimation of subsynchronous frequency components in the measured grid voltage is treated. Two estimation methods, one based on the use of lowpass filters and a recursive least square algorithm, are investigated and compared. In particular, due to its higher degree of freedom in the design, the lowpass filters-based estimation method is found to be the most appropriate and accordingly further analyzed. The method is improved to cope with inaccurate knowledge of the subsynchronous frequency. The simulation results prove the effectiveness of the investigated method both for the ideal and the disturbed case.
Keywords :
least squares approximations; low-pass filters; power system parameter estimation; recursive estimation; lowpass filters-based estimation method; measured grid voltage; online estimation; power system; recursive least square algorithm; subsynchronous frequency components; subsynchronous voltage components; Frequency estimation; Frequency measurement; Least squares approximation; Power system measurements; Power systems; Power transmission lines; Recursive estimation; Resonance; Shafts; Voltage; Filters; frequency-component estimation; recursive least square (RLS); subsynchronous resonance (SSR); torsional oscillations;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2007.905557
