MMC逆向模型预测控制策略研究
Research on MMC Reverse Model Predictive Control Strategy
薛冬 1郭燚 1王灿1
作者信息
- 1. 上海海事大学电气工程系,上海 201306
- 折叠
摘要
模块化多电平换流器MMC(modular multilevel converter)的模型预测控制存在权重因子难以精确设计和计算负荷大等问题,针对这些问题,提出一种MMC逆向模型预测控制策略.通过逆向预测交流侧相电压和每相上、下桥臂总电压,并利用取整函数和目标函数寻优,计算上、下桥臂投入子模块数,独立控制交流侧电流和桥臂环流.所提方法在无需设计权重因子,且每个采样周期只需进行2次循环寻优的同时,还可使交流侧最大输出2N+1电平,并有效控制桥臂环流.此外,采用子模块电容电压分组排序算法来平衡子模块电容电压.最后通过Matlab/Simulink平台上的仿真,验证了所提方法的正确性和有效性.
Abstract
In the model predictive control ( MPC ) of modular multilevel converters ( MMCs ),it is difficult to accurately design the weight factor,and the amount of computational load is usually large.To solve these problems,an MMC reverse MPC strategy is proposed.The AC-side phase voltage and the total voltage of upper and lower bridge arms of each phase are predicted by reverse prediction,the number of input sub-modules of upper and lower bridge arms is calculated by using rounding functions and objective function optimization,and the AC-side current and bridge arm circulation are controlled independently.The proposed method does not need to design the weight factor.It only needs two cycles of optimization in each sampling period while achieving the maximum output level of 2N+1 on the AC-side and effectively controlling the bridge arm circulation.In addition,the sub-module capacitive voltage is balanced by a sub-module capacitive voltage grouping sorting algorithm.Finally,the correctness and effectiveness of the proposed method is verified by simulations performed on a Matlab/Simulink platform.
关键词
模块化多电平换流器/模型预测控制/逆向预测/权重因子/计算负荷Key words
Modular multilevel converter ( MMC )/model predictive control ( MPC )/reverse prediction/weight factor/computational load引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据