An innovative three-phase distributed model is presented for asynchronous machines operating at high-frequency. The model is useful to study the propagation of surge along the stator windings of the machines that is excited by PWM-inverter source or fault waves that occur in the connected line.
The new model is derived from single-phase models traditionally considered in literature. The use of time-space Clarke vectors allow the introduction of mutual coupling between phase winding and the integration of the model extending the methods that had been developed for the single-phase case by substituting real time-space variables with complex functions. A numerical method useful to simulate the distributed model is presented too. This is based on Laplace transformation of the Clarke waves.
Finally, the first numerical results, carried out by applying a unitary steep-surge and a standard IEEE wave for insulation test to the obtained equivalent distributed networks, confirm the model validity and permit to underline the required low computational cost of the approach.
[1]
K. J. Cornick,et al.
Calculation of machine winding electrical parameters at high frequencies for switching transient studies
,
1996
.
[2]
B. Heller,et al.
Surge phenomena in electrical machines
,
1968
.
[3]
M. Vitelli,et al.
Analysis of the voltage distribution in a motor stator winding subjected to steep-fronted surge voltages by means of a multiconductor lossy transmission line model
,
2004,
IEEE Transactions on Energy Conversion.
[4]
K. J. Cornick,et al.
A Computer Model for Calculating Steep-Fronted Surge Distribution in Machine Windings
,
1989,
IEEE Power Engineering Review.
[5]
Yifan Tang,et al.
Analysis of steep-fronted voltage distribution and turn insulation failure in inverter fed AC motor
,
1997,
IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.