Piecewise variable step-size model predictive control strategy for multi-port modular multilevel AC/DC converter

被引：0
|
作者：
Ma W. [1 ]
Wang X. [1 ]
Zhao Y. [1 ]
Li W. [2 ]
Liu X. [1 ]
Huang J. [1 ]
机构：
[1] College of New Energy, China University of Petroleum (East China), Qingdao
[2] Shandong Energy Group, Jinan
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2023年 / 51卷 / 08期
关键词：
AC/DC power bidirectional transmission; equivalent model based on the internal potential of arm voltage; model predictive control; multi-port modular multilevel converter; precise discretization;
D O I：
10.19783/j.cnki.pspc.221143
中图分类号：
学科分类号：
摘要：
Traditional model predictive control involves a large amount of calculation and it is difficult to set the weight factor. Also, it is not suitable for a multi-port modular multilevel AC/DC hybrid converter (MP-M2ADHC). In this paper, the AC/DC coupling characteristics and internal power balance constraints of an MP-M2ADHC are analyzed using the equivalent principle of arm internal potential, and a piecewise variable step-size model predictive control (PVS-MPC) strategy is proposed. Through multiple optimization links, the optimal switching state is sought over different time scales to minimize the error between the predicted and the expected value of the system, and realize the independent control of multiple control targets. To satisfy the demand for accurate discretization of the prediction model, an improved Euler method is proposed to optimize and correct the feedback value of the system, so as to significantly improve the prediction accuracy. Finally, through the time-domain simulation of power bidirectional transmission of converters in different modes, the feasibility and effectiveness of the proposed control strategy and optimization correction strategy are verified by comparing with the traditional model predictive control in terms of output current tracking, circulation suppression and harmonic content. © 2023 Power System Protection and Control Press. All rights reserved.
引用
下载
收藏
页码：13 / 25
页数：12
相关论文
共 25 条
  • [1] DONG Xinzhou, TANG Yong, BU Guangquan, Et al., Confronting problem and challenge of large scale AC-DC hybrid power grid operation, Proceedings of the CSEE, 39, 11, pp. 3107-3119, (2019)
  • [2] CHEN Hanxiong, LI Ting, LI Ao, Study on AC/DC system coordinated control strategy for grid operation performance enhancement, Power System Protection and Control, 49, 10, pp. 123-134, (2021)
  • [3] XIAO Xiangning, Basic problems of the new complex AC-DC power grid with multiple energy resources and multiple conversions, Transactions of China Electrotechnical Society, 30, 15, pp. 1-14, (2015)
  • [4] SCHON A, BAKRAN M., A new HVDC-DC converter with inherent fault clearing capability, European Conference on Power Electronics & Applications, pp. 1-10, (2013)
  • [5] SCHON A, BAKRAN M., High power HVDC-DC converters for the interconnection of HVDC lines with different line topologies, International Power Electronics Conference, pp. 3255-3262, (2014)
  • [6] KISH G J., On the emerging class of non-isolated modular multilevel DC-DC converters for DC and hybrid AC-DC systems, IEEE Transactions on Smart Grid, 10, 2, pp. 1762-1771, (2019)
  • [7] MOON J, GWON J, PARK J, Et al., Model predictive control with a reduced number of considered states in a modular multilevel converter for HVDC system, IEEE Transactions on Power Delivery, 30, 2, pp. 608-617, (2015)
  • [8] MA Wenzhong, SUN Peng, ZHOU Guanyu, Et al., A two-stage model predictive control for modular multilevel converters, Power System Technology, 44, 4, pp. 1419-1427, (2020)
  • [9] ZHANG Jianpo, HU Ziwei, YAN Yu, Research of improved model predictive control strategy for MMC-HVDC, Proceedings of the CSEE, 41, 7, pp. 2363-2373, (2021)
  • [10] MA Wenzhong, TIAN Hongying, LIU Huiyu, Et al., A minimized AC circulating control strategy for a non-isolated modular multilevel DC/DC converter, Power System Protection and Control, 49, 22, pp. 51-58, (2021)
123