摘要
传统的有限控制集模型预测控制存在开关频率不固定的缺点,这给并网逆变器输出滤波器的设计带来了很大的困难。针对这个问题,提出了一种三电平并网逆变器恒定开关频率的模型预测控制策略。该控制策略将预测最优开关序列控制用于三电平并网逆变器中,并对其寻优方式进行改进。改进的方式是通过找出使目标函数最小的中心矢量来对最优开关序列所在的小扇区进行定位。仿真和实验结果表明,所提控制策略不仅能够在实现定频控制的基础上有效减少计算量,而且具有良好的静态和动态性能。
Traditional FCS-MPC(Finite Control Set Model Predictive Control) cannot provide a constant switching frequency, which brings huge difficulties to the design of output filter. To address this issue, a CSF-MPC(Constant Switching Frequency Model Predictive Control) for three-level grid-connected inverters is proposed. The proposed algorithm applies the predicted optimal switch sequence control to three-level grid-connected inverters, and improves its optimization strategy. This improved method is to locate the small sector where the optimal switching sequence is located by searching the center vector that minimizes the objective function. The simulative and experimental results show that the proposed strategy can not only provide fixed frequency with reduced computation cost, but also exhibit satisfactory static and dynamic performance.
作者
程建材
康龙云
胡毕华
冯元彬
CHENG Jiancai;KANG Longyun;HU Bihua;FENG Yuanbin(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Key Laboratory of Clean Energy Technology of Guangdong Province,South China University of Technology,Guangzhou 510640,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2019年第5期169-175,共7页
Electric Power Automation Equipment
基金
广东省科技发展专项基金资助项目(2017B010120001)~~
关键词
三电平并网逆变器
模型预测控制
恒定开关频率
开关序列
中心矢量
three-level grid-connected inverter
model predictive control
constant switching frequency
switching sequence
center vector
