基于优化虚拟矢量的三电平逆变器中点电位平衡闭环控制

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摘要通过对二极管钳位型逆变器中点电位不平衡引起的直流侧电容电压振荡、功率器件电压应力增加及输出电压谐波等问题的分析,提出一种基于优化虚拟空间矢量的三电平逆变器中点电位平衡闭环控制方案,通过构建包含优化因子的最近三虚拟空间矢量模型合成参考空间矢量,根据中点电压实时反馈量对其进行优化,减少输出电压的谐波及失真,同时引入中点电位的不平衡量,计算出各优化虚拟空间矢量作用时间的补偿量,并利用对负载位移角的在线估计实现系统闭环控制。仿真与实验结果表明本方案具有良好的多电平逆变器中点电位平衡控制性能,有效降低了直流侧电容波动。

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	范波
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关键词 ：三电平逆变器, 空间矢量脉宽调制, 虚拟矢量, 中点电位平衡

Abstract：With the analysis of the problems caused by the diode-clamped inverter’s neutral-point voltage unbalance, including DC capacitor voltage oscillation, power device voltage stress increasing, and output voltage harmonic, a scheme on the closed-loop control of neutral-point voltage balance based on optimized virtual space vector for three-level inverter is proposed in this paper. The model of nearest three virtual-space-vector involved the optimization factors is built to synthesize the reference space vector, which is optimized by the neutral-point voltage real-time feedback to reduce the output voltage harmonic and distortion. The amount of unbalance of neutral-point voltage is introduced to calculate the compensation amount of each optimization in virtual space vector time. Also the online estimation of the load displacement angle is adopted to realize the closed-loop control. The simulation and experimental results show that this scheme has better performance on controlling the neutral-point voltage for multi-level inverters and can reduce the fluctuation of DC-link capacitor effectively.

Key words： Three-level inverter space vector pulse-width modulation(SVPWM) virtual vectors neutral-point voltage balance

收稿日期: 2013-04-12 出版日期: 2015-04-13

PACS:

TM464

基金资助:国家自然科学基金（U1404512、61473115）和河南省教育厅科学技术研究重点项目（13A470246）资助

作者简介: 范波男,1975年生,博士,副教授,硕士生导师,研究方向为大容量功率变换与高压交流调速系统。赵伟刚男,1985年生,硕士研究生,研究方向大功率多电平变换器。

引用本文:

范波,赵伟刚,刘刚,谢冬冬. 基于优化虚拟矢量的三电平逆变器中点电位平衡闭环控制[J]. 电工技术学报, 2015, 30(4): 179-186. Fan Bo,Zhao Weigang,Liu Gang,Xie Dongdong. Closed-Loop Control of Neutral-Point Voltage Balance Based on the Optimized Virtual Space Vector for Three-Level Inverter. Transactions of China Electrotechnical Society, 2015, 30(4): 179-186.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I4/179

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