Modified nearest three virtual space-vector modulation method for improved dc-capacitor voltage control in N-level diode clamped inverters

2012 ◽  
Author(s):  
B. Mohamadiniaye Roodsari ◽  
Arif Al-Judi ◽  
E. Nowicki
Keyword(s):  
Voltage Control ◽  
Virtual Space ◽  
Modulation Method ◽  
Space Vector Modulation ◽  
Space Vector ◽  
N Level ◽  
Capacitor Voltage ◽  
Vector Modulation

scholarly journals Space Vector Modulation Strategies for Self-Sensing Three-Phase Radial Active Magnetic Bearings

Actuators ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 41
Author(s):  
Dominik Wimmer ◽  
Markus Hutterer ◽  
Matthias Hofer ◽  
Manfred Schrödl
Keyword(s):  
Magnetic Bearing ◽  
Current Control ◽  
Modulation Method ◽  
Space Vector Modulation ◽  
Position Measurement ◽  
Space Vector ◽  
Position Information ◽  
Rotor Position ◽  
Three Phase ◽  
Vector Modulation

The focus of this study lies on the investigation of the space vector modulation of a self-sensing three-phase radial active magnetic bearing. The determination of the rotor position information is performed by a current slope-based inductance measurement of the actuator coils. Therefore, a special pulse width modulation sequence is applied to the actuator coils by a conventional three-phase inverter. The choice of the modulation type is not unique and provides degrees of freedom for different modulation patterns, which are described in this work. For a self-sensing operation of the bearing, certain constraints of the space vector modulation must be considered. The approach of a variable space vector modulation is investigated to ensure sufficient dynamic in the current control as well as the suitability for a self-sensing operation with an accurate rotor position acquisition. Therefore, different space vector modulation strategies are considered in theory as well as proven in experiments on a radial magnetic bearing prototype. Finally, the performance of the self-sensing space vector modulation method is verified by an external position measurement system.

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