Predictive control of NPC-type three-level grid-connected inverters with virtual space vector modulation
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摘要：
针对传统有限集模型预测控制算法遍历寻优计算量大的问题,提出一种应用于NPC型三相三电平并网逆变器的改进型模型预测控制方法.在建立NPC型并网逆变器数学模型的基础上,将虚拟空间矢量调制技术和有限集模型预测控制算法结合,根据中点电压平衡控制原理,通过虚拟空间矢量调制技术把27个基本电压矢量重构为19个虚拟电压矢量.在原有扇区划分的基础上,增加新的扇区作为辅助扇区,减少模型预测控制遍历寻优次数,降低系统的运算量.同时根据虚拟空间矢量调制技术实现对NPC型并网逆变器中点电压的控制,在模型预测控制的代价函数中省去了中点电压平衡控制这一项.在搭建的NPC型三相三电平并网逆变器系统模型上进行仿真分析,结果表明所提算法能够有效减少计算量,有效实现了中点电压平衡,系统动态性能和稳态性能均有提高.
To address the problem of large computation of traversal optimization of traditional finite set model predictive control algorithm,an improved model predictive control method applied to NPC three-phase three-level grid-connected inverter is proposed in this paper.Based on the mathematical model of NPC-type grid-connected inverter,the virtual space vector modulation and the finite set model predictive control algorithm are combined to reconstruct the 27 basic voltage vectors into 19 virtual voltage vectors by the virtual space vector modulation technique according to the neutral-point voltage balance control principle.On the basis of the original sector division,new sectors are added as auxiliary sectors to reduce the number of traversal optimization of model predictive control,thus reducing the amount of calculation of the system.At the same time,the neutral-point voltage control of the NPC-type grid-connected inverter is implemented according to the virtual space vector modulation technique,and the neutral-point voltage balance control can be omitted from the cost function of the model prediction control.The simulation analysis on the NPC three-phase three-level grid-connected inverter system model shows that the algorithm proposed in this paper can effectively reduce the amount of computation,realize the neutral-point voltage balance,and improve the system dynamic performance and steady-state performance.
作者：
刘俊志 黄景涛 杨清 刘帅
Liu Junzhi;Huang Jingtao;Yang Qing;Liu Shuai(Electrical Engineering College,Henan University of Science and Technology,Luoyang 471023,China)
机构地区：
河南科技大学电气工程学院
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2022年第6期114-120,共7页
Journal of Henan Normal University(Natural Science Edition)
基金：
国家自然科学基金(U1504617)。
关键词：
并网逆变器 有限集模型预测控制 虚拟空间矢量调制 中点电压平衡
grid-connected inverters finite control set model predictive control virtual space vector modulation neutral-point voltage balance
分类号：
TP273 [自动化与计算机技术—检测技术与自动化装置]
