An Improved Virtual Space Vector Modulation Scheme for Three-Level Active Neutral-Point-Clamped Inverter

2017 ◽  
Vol 32 (10) ◽  
pp. 7419-7434 ◽  
Author(s):  
Cungang Hu ◽  
Xinghuo Yu ◽  
Donald Grahame Holmes ◽  
Weixiang Shen ◽  
Qunjing Wang ◽  
...  
Keyword(s):  
Neutral Point ◽  
Virtual Space ◽  
Modulation Scheme ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Vector Modulation

Discontinuous Space Vector Modulation Strategy for Three-Level Neutral Point Clamped Inverter

2015 ◽  
Vol 781 ◽  
pp. 435-438
Author(s):  
Kanyarat Ek-Iam ◽  
Yuttana Kumsuwan
Keyword(s):  
Duty Cycle ◽  
Mathematical Analysis ◽  
Switching Time ◽  
Neutral Point ◽  
Modulation Scheme ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Switching Losses ◽  
Calculation Results ◽  
Vector Modulation

This paper presents a discontinuous space vector modulation (SVM) strategy for a three-level neutral point clamped (3L-NPC) inverter. The proposed scheme, calculation switching time of the 3L-NPC inverter is fully described. A mathematical analysis of the duty cycle is determined by utilizing the calculated switching time method. The main advantages of the proposed method are minimization of the number of commutations of switches and reduction of the switching losses. Simulated and calculation results are presented to verify the validity and effectiveness of the proposed modulation scheme.

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.

Sign in / Sign up

Export Citation Format

Share Document