摘要
针对传统三电平有源中点钳位(ANPC)并网逆变器有限控制集模型预测控制存在的计算流程复杂、中点电压波动较大、输出电流谐波较大的问题,提出了一种基于优化代价函数的三电平ANPC并网逆变器电流预测控制方法.该方法简化了传统模型预测控制方法中建立直流侧中点电压偏移量ΔU dc与三相开关状态S_( x)中间变量的步骤,在静止αβ坐标系下,利用负载电流i、ΔU dc与S x之间的关系直接建立数学模型,通过对27种开关状态的实时计算,确定最优输出开关状态.仿真和实验结果表明,该方法有效降低了电流谐波畸变率,达到了抑制中点电压波动的效果.
Aiming at the problems of complicated calculation process,large neutral pointe potential fluctuation and large output current harmonic of the traditional three-level ANPC grid-connected inverter limited control set model predictive control,a current control method of three-level ANPC grid-connected inverter based on optimized cost function was proposed.This method simplified the steps of establishing the intermediate variable of the DC side mid-point voltage offsetΔU dc and the three-phase switching state S _(x) in the traditional model predictive control method.Under the staticαβcoordinate system,the relationship between load current i,ΔU dc and S x was used to directly establish a mathematical model.Through the real-time calculation of 27 switch states,the optimal output switch state was selected.Simulation and experiment result showed that the method effectively reduced the total harmonic distortion rate and achieved the effect of suppressing midpoint voltage fluctuations.
作者
王楠
窦智峰
李琰琰
武洁
WANG Nan;DOU Zhifeng;LI Yanyan;WU Jie(College of Electric and Information Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China)
出处
《轻工学报》
CAS
北大核心
2021年第2期92-101,共10页
Journal of Light Industry
基金
国家自然科学基金项目(51707176)
河南省自然科学基金项目(162300410321)。
关键词
ANPC并网逆变器
有限控制集模型预测
中点电压波动
三相开关状态
ANPC grid-connected inverter
finite control set model prediction
mid-point voltage fluctuation
three-phase switching state
