考虑死区电压矢量的三电平变换器模型预测控制

doi:10.19595/j.cnki.1000-6753.tces.212128

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摘要针对三电平变换器,该文提出一种考虑死区电压矢量的有限集模型预测控制策略。基于死区效应,将控制集中基本矢量和对应的死区电压矢量合成虚拟矢量,并通过优化死区时间构建新的虚拟矢量控制集。为减少计算量,首先,基于无差拍预测得到参考矢量,严格证明了输出矢量和参考矢量的欧氏距离与传统价值函数中电流预测部分的等价性,从而构建新的价值函数,有效地降低了迭代计算的复杂度;其次,利用相关基本矢量来构建简化控制集,显著地缩小了寻优空间;最后,通过基于欧氏距离的价值函数从虚拟矢量控制集中选择最优虚拟矢量,实现了变死区时间模型预测控制。通过仿真和实验验证,与传统模型预测控制相比,该文提出的控制策略可使输出电流脉动减小,电流总谐波畸变率降低约40%~50%,显著地提高了变换器的控制性能。

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	周汉斌
	杨建
	陈晓娇
	黄连生
	董密

关键词 ：模型预测控制, 欧氏距离, 死区电压矢量, 无差拍预测, 电流控制

Abstract：Aiming at the three-level converter, this paper proposes a finite-control-set model predictive control strategy considering dead-zone voltage vector. Based on the dead-zone effect, a virtual vector is synthesized from the basic voltage vector and the corresponding dead-zone voltage vector, and a new virtual vector control set is constructed by optimizing the dead-zone time. To reduce the amount of calculation, firstly, the reference vector is obtained by the deadbeat prediction. It is strictly proved that the Euclidean distance between the output vector and the reference vector is equivalent to the current prediction of the traditional value function. Therefore, a new simplified value function is constructed, which effectively reduces the complexity of iterative calculations. Secondly, the relevant basic vector is selected to construct a simplified control set, which significantly reduces the search space. Finally, the optimal virtual vector is selected by the value function based on the Euclidean distance, and the fast model predictive control with variable dead-zone time is realized. Compared with the traditional model predictive control, the control strategy proposed in this paper can decrease the output current pulsation and reduce the total harmonic distortion of the current by about 40%~50%, which significantly improves the control performance of the converter.

Key words： Model predictive control Euclidean distance dead-zone voltage vector deadbeat prediction current control

收稿日期: 2021-12-29

PACS:

TM464

基金资助:国家自然科学基金项目（52177204, 51777217）、湖南省自然科学基金面上项目（2020JJ4744, 2021JJ30875）和安徽省科技重大专项项目（202003a05020019）资助

通讯作者: 陈晓娇女,1989年生,副研究员,研究方向为多电平变流器。E-mail: chenxj@ipp.ac.cn

作者简介: 周汉斌男,1997年生,博士研究生,研究方向为多电平变流器。E-mail: amoszz@csu.edu.cn

引用本文:

周汉斌, 杨建, 陈晓娇, 黄连生, 董密. 考虑死区电压矢量的三电平变换器模型预测控制[J]. 电工技术学报, 2022, 37(20): 5290-5301. Zhou Hanbin, Yang Jian, Chen Xiaojiao, Huang Liansheng, Dong Mi. Model Predictive Control of Three-Level Converter Considering Dead-Zone Voltage Vector. Transactions of China Electrotechnical Society, 2022, 37(20): 5290-5301.

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