Accurate modelling of electrical drives for on-line testing is a relevant problem for railway applications. Electrical drives show a nonlinear behaviour. Efficient modelling for simulation, performance evaluation and testing must consider accurate as well as simple models. Linear models can be efficiently used only keeping the variables of interest in a limited range around the operating point. However the interactions between machines and converters are poorly described and high order models may be intractable. In this paper is considered a novel approach based on Hammerstein nonlinear models, described by a static nonlinear element followed by a linear model. Simulation results and preliminary experimental tests in the case of a typical dc/ac inverter installed on medium distance FS coaches are shown. It is shown that Hammerstein models can approximate adequately the models of the electrical drives used for traction applications, allowing performance evaluation and testing on a systematic basis.
Advanced methods for modelling and testing of electrical drives
BALESTRINO, ALDO;LANDI, ALBERTO;
1997-01-01
Abstract
Accurate modelling of electrical drives for on-line testing is a relevant problem for railway applications. Electrical drives show a nonlinear behaviour. Efficient modelling for simulation, performance evaluation and testing must consider accurate as well as simple models. Linear models can be efficiently used only keeping the variables of interest in a limited range around the operating point. However the interactions between machines and converters are poorly described and high order models may be intractable. In this paper is considered a novel approach based on Hammerstein nonlinear models, described by a static nonlinear element followed by a linear model. Simulation results and preliminary experimental tests in the case of a typical dc/ac inverter installed on medium distance FS coaches are shown. It is shown that Hammerstein models can approximate adequately the models of the electrical drives used for traction applications, allowing performance evaluation and testing on a systematic basis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
