Original scientific paper
https://doi.org/10.17559/TV-20140709093649
Hydro generator thermal system identification and parameter estimation
Muharem Mehmedović
; Energocontrol Zagreb Ltd. Kovinska 30, 10 090 Zagreb, Croatia
Vedrana Jerković Štil
orcid.org/0000-0001-9825-0507
; Faculty of Electrical Engineering, Computer Science and Information Technology, Osijek Kneza Trpimira 2B, 31 000 Osijek, Croatia
Zdravko Rabuzin
; Energocontrol Zagreb Ltd. Kovinska 30, 10 090 Zagreb, Croatia
Abstract
In this paper identification and parameter estimation of a hydro generator thermal system using collected input and output data is presented. Third order state space model is constituted on the basis of a set of independent output variable (temperature) measurements derived from the system response to three thermal sources. Data were collected during a heat run and site acceptance test of a refurbished machine. Least squares (LS or RLS) methodology is used in parameter estimation procedure. Minimisation is performed on weighted measurement and model output distance squares. During the procedure system and input matrices were obtained. Thereafter, spectral properties of system matrix are analysed using calculated eigenvalues and eigenvectors. Eigenvalues assignment to the physical system objects is performed via L2 norm calculation and ranked to output variable sensitivities with respect to their time constants (negative reciprocal eigenvalues). Finally, simplified analogous lumped parameter scheme of the machine thermal system has been outlined.
Keywords
hydro generator; L2 norm; least squares method; parameter estimation; thermal system
Hrčak ID:
186063
URI
Publication date:
2.9.2017.
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