A simplified hybrid carrier-based PWM technique for three-level NPC inverters considering neutral-point voltage balance

2018 ◽  
Vol 14 (2) ◽  
pp. 312-320 ◽  
Author(s):  
Xi Chen ◽  
Shenghua Huang ◽  
Bingzhang Li ◽  
Fang Wu
Keyword(s):  
Neutral Point ◽  
Voltage Balance

Study on the New SVPWM Method for Three-Level Inverter of Brushless Doubly-Fed Machine

2012 ◽  
Vol 619 ◽  
pp. 156-159 ◽  
Author(s):  
Yan Liu ◽  
Xu Wang ◽  
Yan Xing ◽  
Dan Yang
Keyword(s):  
Pulse Width Modulation ◽  
Neutral Point ◽  
Virtual Space ◽  
Modulation Method ◽  
Space Vector ◽  
Constant Frequency ◽  
Voltage Balance ◽  
Doubly Fed ◽  
Vector Modulation ◽  
Doubly Fed Machine

Brushless doubly-fed machine (BDFM) is a new type of AC induction motor.It has a good applicable prospect as the variable frequency motors or the variable speed constant frequency generators. Although the advantage of the three-level inverter, there are also some problems of neutral point voltage balance in this method such as the unbalance of neutral point voltage. And the traditional principle of Three-level inverter space vector pulse width modulation method is to estimate the sectors and calculating a lot of trigonometric functions. To solve these problems, a novel method for the virtual space vector concept in G-H coordinate system is presented in this paper. The method proposed can omit the judging process of the sectors, reduce the calculating burden, and maintain the balance of neutral-point voltage between capacitances within a certain index modulation. The results of simulation are given to validate the improved virtual space vector modulation.

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