摘要
模型预测控制易于协同控制多个参量,在模块化多电平换流器控制中体现出显著的优势,但传统的有限状态模型预测控制方法的权重因子难以精确设计,需要依赖大量的仿真和实验测试。文中提出一种有限状态分层模型预测控制方法,通过逆向预测交流电压以及桥臂内部不平衡电压降计算上/下桥臂导通子模块数,实现交流电流控制和环流抑制。所提方法不仅省去了权重因子的繁杂设计过程,且无须循环计算所有开关状态,简化了循环预测次数,还可确保2N+1电平输出;同时,提出了一种基于预测分组排序的子模块电容电压平衡控制方法,可有效降低电压排序次数和开关频率,从而降低控制器的计算量。最后,搭建了模块化多电平换流器平台,验证了所提方法的正确性和有效性。
Model predictive control is easy to control multiple parameters coordinately, which has significant advantages in the control of modular multilevel converter(MMC). However, the weighting factors of conventional finite-state model predictive control method are difficult to be designed accurately, which needs a large number of simulations and experimental tests. This paper proposes a hierarchical model predictive control method based on finite state. The number of inserted sub-modules of upper and lower arms is calculated through reverse prediction of AC voltage and the internal unbalanced voltage drop of arms, which achieves AC current control and circulating current suppression. In the proposed method, not only the complicated design process of weight factors is eliminated, but also all switching states need not be calculated circularly, which greatly simplifies the number of prediction cycle and can ensure output voltage levels of 2 N+1. At the same time, a balance control method of sub-module capacitor voltage based on prediction group sorting is proposed, which effectively reduces the number of voltage sorting and switching frequency, thus relieving the computation burden of the controller. Finally, an MMC converter platform is built,and the correctness and effectiveness of the proposed method are verified.
作者
杨兴武
徐依明
杨帆
王涛
杨帅
薛花
YANG Xingwu;XU Yiming;YANG Fan;WANG Tao;YANG Shuai;XUE Hua(College of Electric Power Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2020年第15期148-158,共11页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51207086)
上海市科技创新行动计划资助项目(19DZ1205402)
上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)
关键词
模块化多电平换流器
模型预测控制
分层控制
子模块电容电压平衡
分组排序
modular multilevel converter(MMC)
model predictive control(MPC)
hierarchical control
balance of sub-module capacitor voltage
group sorting
作者简介
杨兴武(1981—),男,博士,副教授,主要研究方向:功率变换器高性能控制及新能源并网技术。E-mail:yxw790930@sohu.com;通信作者:徐依明(1993—),男,硕士研究生,主要研究方向:新能源并网技术。E-mail:yimingxuhome@163.com;杨帆(1993—),男,硕士研究生,主要研究方向:柔性直流输电技术。
