电气技术  2022, Vol. 23 Issue (6): 17-23    DOI:
研究与开发 |
基于三矢量模型预测控制的T型三电平整流器定频控制策略
许嘉杰, 李锐华, 胡波
同济大学电子与信息工程学院,上海 201804
Fixed frequency control strategy of T-type three-level rectifier based on three vector model predictive control
XU Jiajie, LI Ruihua, HU Bo
College of Electronic and Information Engineering, Tongji University, Shanghai 201804
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摘要 针对T型三电平整流器存在中点电位不平衡的问题,模型预测控制(MPC)对于改善和提高T型三电平整流器控制性能具有良好的应用潜力,但传统的有限集模型预测控制存在算法计算量大、权重因子调整困难、开关频率不固定等缺陷,会直接影响模型预测控制在T型三电平整流器中的应用效果。针对以上问题,提出一种基于快速矢量选择的三矢量定频模型预测控制算法,利用无差拍的思想将电流跟踪转化为电压跟踪,剔除远离参考电压矢量和对中点电位平衡调整不利的电压矢量,并根据参考电压矢量确定控制周期内的开关矢量。在此基础上,利用电压跟踪代价函数得到开关矢量的作用时间,最终根据切换顺滑原则得到开关序列,最后进行仿真研究。研究结果表明,与传统有限集模型预测控制相比,所提方法能够大大减小计算量,实现固定开关频率,从而减小电压和功率脉动,获得良好的控制性能。
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关键词 T型三电平整流器模型预测控制(MPC)固定开关频率三矢量合成中点电位平衡电压跟踪    
Abstract:Aiming at the problem of neutral point potential imbalance in T-type three-level rectifier, model predictive control (MPC) has good application potential to improve the control performance of T-type three-level rectifier, but the traditional finite set model predictive control has some defects, such as large amount of algorithm calculation, difficult adjustment of weight factor, unstable switching frequency and so on, It will directly affect the application effect of model predictive control in T-type three-level rectifier. To solve the above problems, a three vector constant frequency model predictive control algorithm based on fast vector selection is proposed. Using the idea of deadbeat, the current tracking is transformed into voltage tracking, the voltage vectors far away from the reference voltage vector and unfavorable to the neutral point potential balance adjustment are eliminated, and the switching vector in the control cycle is determined according to the reference voltage vector. On this basis, the action time of the switching vector is obtained by using the voltage tracking cost function. The switching sequence is obtained according to the switching smoothness principle. Finally, the simulation is carried out. The results show that compared with the traditional finite set model predictive control, the proposed method can greatly reduce the amount of calculation and realize the fixed switching frequency, so as to reduce the voltage and power pulsation and obtain good control performance.
Key wordsT-type three-level rectifier    model predictive control (MPC)    fixed switching frequency    three vector synthesis    neutral point potential balance    voltage tracking   
收稿日期: 2022-02-17     
基金资助:教育部2021年产学合作协同育人项目(202102362006)
作者简介: 许嘉杰(1997—),男,江苏省无锡市人,硕士研究生,主要研究方向为变流器的模型预测控制。
引用本文:   
许嘉杰, 李锐华, 胡波. 基于三矢量模型预测控制的T型三电平整流器定频控制策略[J]. 电气技术, 2022, 23(6): 17-23. XU Jiajie, LI Ruihua, HU Bo. Fixed frequency control strategy of T-type three-level rectifier based on three vector model predictive control. Electrical Engineering, 2022, 23(6): 17-23.
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