scholarly journals A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

2016 ◽  
Vol 16 (3) ◽  
pp. 946-959 ◽  
Author(s):  
Chuan-Jin Zhang ◽  
Yi Tang ◽  
Dong Han ◽  
Hui Zhang ◽  
Xiao Zhang ◽  
...  
Keyword(s):  
Neutral Point ◽  
Virtual Space ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Point Potential ◽  
Vector Modulation

An Improved VSVPWM Strategy of Considering Neutral-Point Potential Balancing in Three-Level NPC Converter

2014 ◽  
Vol 496-500 ◽  
pp. 1079-1083
Author(s):  
Shi Weng Gui ◽  
Lu Wang ◽  
Sheng Hua Huang
Keyword(s):  
Neutral Point ◽  
Virtual Space ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Multilevel Converters ◽  
Control Approach ◽  
Research Fields ◽  
Point Potential ◽  
Vector Modulation ◽  
Level Converter

Neutral-point (NP)-clamped three-level converter is a widely used topology in the research fields of the multilevel converters, which suffers from the NP voltage drift as its main technical drawback. In theory, it is based on the fact that the virtual space vector modulation approach could completely control the balance of neutral-point potential, so this paper introduces a improved control strategy of neutral-point potential balancing in three-level converter, which combines the space vector modulation approach based on virtual vectors with the algorithm of modifying small vectors pairs distribution time accurately. Relative to the traditional proposed algorithm of setting voltage tolerance range to modify small vectors pairs distribution time,the performance of algorithm of capacitor charge balancing is better and its accuracy of control is more precise. The feasibility of the proposed control approach has been verified via experiment results.

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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