A Carrier-Based Virtual Space Vector Modulation With Active Neutral-Point Voltage Control for a Neutral-Point-Clamped Three-Level Inverter

2018 ◽  
Vol 65 (11) ◽  
pp. 8687-8696 ◽  
Author(s):  
Jiang Weidong ◽  
Lei Wang ◽  
Jinping Wang ◽  
Xuewei Zhang ◽  
Peixia Wang
Keyword(s):  
Voltage Control ◽  
Neutral Point ◽  
Virtual Space ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Vector Modulation

A Three-Level DTC System Based on Virtual Space Vector Modulation for Bearingless Permanent Magnet Synchronous Motor

2014 ◽  
Vol 703 ◽  
pp. 356-359 ◽  
Author(s):  
Yu Xin Sun ◽  
Chang Sheng Xu ◽  
Huang Qiu Zhu
Keyword(s):  
Permanent Magnet ◽  
Control Strategy ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Neutral Point ◽  
Virtual Space ◽  
Torque Control ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Vector Modulation

In This paper, a direct torque control (DTC) method for bearingless permanent magnet synchronous motor (BPMSM) based on three-level neutral-point clamped (NPC) inverter is described. Through the analysis of virtual space vector modulation, an independent control strategy is adopted into the suspension winding control and a flux linkage error vector SVM-DTC method supplied by three-level NPC inverter is introduced into the torque windings control. By using the proposed control strategy, the neutral-point voltage variation can be greatly limited and the voltage shifting can be eliminated. The results of simulation verify the feasibility of the control algorithm, the dv/dt of output voltage and the torque ripple are restrained effectively, satisfactory robustness and the good performance of the radial levitation can be achieved in a wide speed range by using the proposed method.

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