Numerical impulse response test to estimate circuit-model parameters for induction machines

Abstract

Numerical impulse response test to estimate circuit-model parameters for induction machines.Abstract: The estimation of electrical parameters of a cage induction machine is studied. First, the steady-state parameters are estimated using two-dimensional finite element analysis (FEA) with the assumption of sinusoidal time variation. Next, a numerical impulse response test using timestepping FEA is utilised to produce the voltage-current data for the small-signal model parameter estimation. The method is based on the assumption of linear behaviour near the operating point and the choice for the suitable excitation signal is studied. To distinguish the influence of the skin effect, the impulse response test is also performed for the corresponding slip-ring machine. The parameters are estimated from the frequency response function of the stator line current using differential evolution. The results of the FE simulations are compared with measurements.

Small-signal model for saturated deep-bar induction machines

“…Parameters of a 37-kW squirrel-cage induction machine were estimated using the numerical impulse response test [13,18] based on the data obtained from time-stepping FEA [12]. The machine is equipped with deep rotor bars and closed rotor slots; the cross-section of a rotor bar is shown in Fig.…”

Robust Attenuation of Frequency Varying Disturbances

“…The constant parameter values can be identified by the well-known methods (Holopainen et al, 2004;Laiho et al, 2008;Repo & Arkkio, 2006). The results obtained by using finite-element (FE) model as the "real" process have been good and accurate (Laiho et al, 2007), when both prediction error method (PEM) and subspace identification (SUB) have been used.…”

Small-Signal Modeling of Mutual Saturation in Induction Machines

“…Hence, the number of time-stepping FEA simulations required for gathering frequency-response data can be significantly reduced as compared to harmonic excitation. Here, the voltage pulse is defined by [14] The results of time-stepping computations were transformed to the frequency domain using DFT. Since two pulse tests were made, it was possible to calculate all four small-signal admittances Y dd (jω), Y dq (jω), Y qd (jω), and Y qq (jω).…”

“…The identification data is produced using time-stepping finiteelement analysis (FEA) [13] and locked-rotor measurements. Voltage pulses [14] and pulsating voltage-signal injection are used as excitation signals.…”