文章摘要
谢之光,侯世英,唐治德,等.NPC三电平逆变器最优化虚拟电压矢量控制[J].电力系统自动化,2017,41(18):95-102. DOI: 10.7500/AEPS20170114005.
XIE Zhiguang,HOU Shiying,TANG Zhide, et al.Optimized Virtual Voltage Vector Control of NPC Three-level Inverter[J].Automation of Electric Power Systems,2017,41(18):95-102. DOI: 10.7500/AEPS20170114005.
NPC三电平逆变器最优化虚拟电压矢量控制
Optimized Virtual Voltage Vector Control of NPC Three-level Inverter
DOI:10.7500/AEPS20170114005
关键词: 三电平逆变器  中点电位平衡  最优化方法  虚拟电压矢量  全局最优解
KeyWords: three-level inverter  neutral point voltage balancing  optimization method  virtual voltage vectors  globally optimal solution
上网日期:2017-06-27
基金项目:
作者单位E-mail
谢之光 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044 xiezhiguang88@163.com 
侯世英 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044  
唐治德 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044  
孙韬 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044  
陈剑飞 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044  
摘要:
      三电平逆变器的中点电位不平衡不仅使开关管的电压应力增加,还会导致输出电流的谐波畸变率增高。因此,三电平逆变器的中点电位平衡控制一直是国内外学者的研究热点。以中点钳位型(NPC)三电平逆变器作为研究对象,提出了一种最优化虚拟电压矢量中点电位平衡控制方法。该方法首先以三电平逆变器固有的有限个离散电压矢量为基础,构造出连续的虚拟电压矢量。然后以参考电压和中点电位平衡为控制目标定义代价函数,此代价函数可以灵活方便地控制逆变器的综合性能。由最优化方法求解出使代价函数值最小的虚拟电压矢量,即为控制参考电压和中点电位平衡的全局最优解,此方法不仅可以保证输出电压有较好的跟踪效果,还具有较强的中点电位平衡能力和抗干扰能力。仿真和实验都对此进行了有效的证明。
Abstract:
      The unbalanced neutral point voltage of three-level inverter can not only cause increased voltage stress on the switching device, but also increase the total harmonic distortion(THD)of the output current. So, the control of the unbalanced neutral point voltage of three-level inverter is always the research focus for scholars. A control strategy that balances the neutral point voltage for three-level neutral-clamped inverter systems is proposed. The proposed control strategy makes continual virtual voltage vectors with finite discrete voltage vectors of three-level inverter. Then, the cost function, which can flexibly control the comprehensive performance of the inverter, is defined according to the control goals including reference voltage and balance of neutral point voltage. The virtual voltage vectors, which track reference voltage and balance neutral point voltage, as well as minimize cost function, can be gotten with the optimization method. This method can not only guarantee good tracking effect of output voltage, but also has strong neutral point voltage balancing and anti-interference ability. Effective verification has been made by simulation and experiment.
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