一种新型零序分量注入三电平调制策略
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摘要
为了解决传统三电平空间矢量调制(SVM)策略实现复杂的问题,提出了一种基于零序分量注入的三电平逆变器新型调制方法。该方法与传统的SVM完全等效,但实现简单且无需复杂的扇区判断。零序分量在整个复平面内具有统一的表达式,其选择仅基于三相调制波的大小和逻辑关系。同时,通过改变零序分量表达式中的比例系数很容易实现中点电压平衡控制。仿真和实验结果验证了该方法的有效性。
The traditional three-level space vector modulation(SVM)strategy is complicated.In order to solve this problem,a novel three-level modulation strategy based on zero-sequence component injection is proposed.The method,which is equivalent to SVM,is simple and does not require any complicated sector estimations.The zero-sequence component has a piecewise but uniform expression in the whole complex plane and the selection of it is entirely based on the size and logical relationship of the three-phase modulation waves.Meanwhile,the neutral-point voltage balance control can be realized directly by changing the proportion coefficient in the expression of the zero-sequence component.Simulation and experimental results validate the effectiveness of the proposed method.
The traditional three-level space vector modulation(SVM)strategy is complicated.In order to solve this problem,a novel three-level modulation strategy based on zero-sequence component injection is proposed.The method,which is equivalent to SVM,is simple and does not require any complicated sector estimations.The zero-sequence component has a piecewise but uniform expression in the whole complex plane and the selection of it is entirely based on the size and logical relationship of the three-phase modulation waves.Meanwhile,the neutral-point voltage balance control can be realized directly by changing the proportion coefficient in the expression of the zero-sequence component.Simulation and experimental results validate the effectiveness of the proposed method.
引文
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[2]李宁,王跃,雷万钧,等.三电平NPC变流器SVPWM策略与SPWM策略的等效关系研究[J].电网技术,2014,38(7):1283-1290.
[3]F Wang.Sine-triangle Versus Space-vector Modulation for Three-level PWM Voltage-source Inverters[J].IEEE Trans.on Industry Applications,2002,38(2):500-506.
[4]K Zhou,D Wang.Relationship Between Space-vector Modulation and Three-phase Carrier-based PWM:A Comprehensive Analysis[J].IEEE Trans.on Industrial Electronics,2002,49(1):186-196.
[5]吴洪洋,何湘宁.多电平载波PWM法与SVPWM法之间的本质联系及其应用[J].中国电机工程学报,2002,22(5):11-16.
[6]方辉.三相逆变(整流)器调制与模型预测控制算法研究[D].成都:西南交通大学,2016.
[7]Z Wang,F Cui,G Zhang,et al.Novel Carrier-based PWM Strategy With Zero-sequence Voltage Injected for Threelevel NPC Inverter[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2016,4(4):1442-1451.