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The application of reduced common mode voltage pulse width modulation methods bring much high order harmonics to the variable speed drive system, which causes considerable iron loss inside the electric motor. In this paper, an improved iron loss model considering those high order harmonics is proposed. Iron loss coefficients are obtained based on experimental data by utilizing multiple linear regression...
Due to the current restriction of semiconductor devices, the start-up is an extremely important process in the ASD(adjustable speed drive)system. DC pre-excitation is one of the effective solutions for increasing the starting torque and depressing the starting inrush current. However the effect of DC pre-excitation would be discounted if it could not be compatible with the induction motor drive control...
A sensorless induction motor drive fed by 3-level inverter is presented, which combines the principle of indirect torque control, space vector modulation (SVM), speed adaptive flux observer and fuzzy logic controller (FLC). By using SVM, the switching frequency is kept constant and it is easy to solve the problems such as neutral point balance, voltage jump, etc, and more accurate results are obtained...
For three-level neutral point clamped (NPC) back-to-back converter, the inductor in grid side and capacitors in dc-bus are the most important components, which not only influence system performance but also determine the design of system controllers. This paper provides an optimized design method for these energy storage components according to the specific control method of the system. Experimental...
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