Priority Sorting Approach for Modular Multilevel Converter Based on Simplified Model Predictive Control

被引:133
作者
Huang, Jingjing [1 ]
Yang, Bo [1 ]
Guo, Fanghong [2 ]
Wang, Zaifu [3 ]
Tong, Xiangqian [1 ]
Zhang, Aimin [3 ]
Xiao, Jianfang [4 ]
机构
[1] Xian Univ Technol, Dept Elect Engn, Xian 710048, Shaanxi, Peoples R China
[2] Agcy Sci Technol & Res, Expt Power Grid Ctr, Singapore 627590, Singapore
[3] Xi An Jiao Tong Univ, Sch Elect & Informat Engn, Xian 710049, Shaanxi, Peoples R China
[4] Nanyang Technol Univ, Energy Res Inst, Singapore 639798, Singapore
基金
中国国家自然科学基金;
关键词
Circulating current; model predictive control (MPC); modular multilevel converter (MMC); voltage balancing control; weight factor; SUPPRESSION; OPERATION; STRATEGY; TORQUE;
D O I
10.1109/TIE.2017.2774725
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
In this paper, a priority sorting approach based on simplified model predictive control (MPC) is proposed for modular multilevel converter (MMC). It aims at reducing the computational burden of conventional MPC method while maintaining the system performance, especially under high voltage levels. The proposed approach mainly consists of three parts, i.e., grid-side current control (GCC), circulating current control (CCC), and capacitor voltage balancing control (CVBC). The GCC and CCC are separately designed with simplified MPCs, avoiding the weight factor. Meanwhile, the redundant calculations are eliminated in GCC by considering the desired predicted output voltage of equivalent MMC model. To further minimize the optional combinations of the switching states, the CCC is constructed by utilizing the output of GCC and the arm current. Besides, a novel priority sorting approach is proposed for the CVBC to alleviate the sorting operation. The submodules are divided into three groups according to the detected capacitor voltages. Moreover, the groups are assigned with different priorities based on the arm current, and only one group needs the sorting process. Additionally, a reduced frequency approach is introduced to decrease the power loss in the steady state. The effectiveness of the proposed approach is validated by both simulation and experimental results.
引用
收藏
页码:4819 / 4830
页数:12
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