摘要
研究了二极管钳位型三电平逆变器的中点电压平衡控制方法。建立了三电平逆变器的综合数学模型,提出了一种采用最近三矢量法合成参考矢量的空间矢量脉宽调制SVPWM算法,给出了小三角形区域判断规则、合成参考电压矢量的相应输出电压矢量的作用顺序,并推导出各合成电压矢量的作用时间。探讨了影响三电平逆变器中点电压平衡的主要因素,提出了一种仅通过检测任一相桥臂的电流方向和中点电压波动的中点电压平衡控制方法。实验结果验证了文中提出的空间电压矢量调制算法的有效性。
This paper focuses mainly on the control method of neutral-point voltage balancing in the three-level inverter.A comprehensive mathematic model of three-level inverter is set up.A novel space vector modulation algorithm is proposed by using the nearest three vectors as the reference voltage vector.The judging rules of the small sectors and the out voltage vector sequence are presented.The duty time of each vector is also computed.The main factors for the neutral-point imbalance are discussed.A simple neutral-point voltage balancing control method,which only requires the direction information detection of each phase leg＇s current and neutral point voltage ripple,is proposed.The validity of the proposed method is demonstrated by the experimental results.
出处
《电子科技》
2011年第3期104-107,126,共5页
Electronic Science and Technology
关键词
空间矢量脉宽调制
三电平逆变器
中点电压平衡
space vector pulse width modulation
three-level inverter
neutral point voltage balance
