基于冗余矢量的T型三电平双向变换器中点电位平衡模型预测控制
Model Predictive Control for Midpoint Potential Balance of T-type Three-level Bidirectional Converter Based on Redundant Vector
王勋嵩 1李锐华 1许嘉杰 2王汉卿1
作者信息
- 1. 同济大学电子与信息工程学院,上海 201804
- 2. 国网上海嘉定供电公司,上海 201800
- 折叠
摘要
T 型三电平双向变换器因其具有损耗小、输出电能质量高等优势适合应用于低压交直流混合配电网互联等场景.针对T型三电平双向变换器存在直流侧中点电位不平衡等问题,模型预测控制因其易于实现多目标优化的特点具有良好的应用价值.为了解决传统有限集模型预测控制(FCS-MPC)权重因子整定困难,中点电位控制效果不佳的问题,提出一种基于冗余矢量的中点电位平衡模型预测控制,利用冗余小矢量的特性实现对中点电位平衡的控制,避免了权重因子的选择.在此基础上,利用代价函数计算矢量的作用时间并预测输出最优开关序列,提升系统的稳态性能.最后,通过实验测试验证了所提策略的有效性.
Abstract
The T-type three-level bidirectional converter is suitable for application in low-voltage AC/DC hybrid distri-bution network interconnection scenarios due to its advantages of low loss and high output power quality.In view of the imbalance of midpoint potential on the DC side of T-type three-level bidirectional converter,model-predictive controls have good application value because it is easy to realize multi-objective optimization.However,the traditional finite set model predictive control(FCS-MPC)has the problem of difficulty in weight factors adjusting,which affects the midpoint potential control effect.To solve the problems above,a model-predictive control for midpoint potential balance based on redundant vectors is proposed,which uses the characteristics of redundant small vectors to realize the control of midpoint potential balance and avoid the selection of weight factors.On this basis,the cost function is used to calculate the action time of the vector and predict the optimal switching frequency to improve the steady-state performance of the system.Fi-nally,the effectiveness of the proposed strategy is verified through experimental testing.
关键词
T型三电平双向变换器/模型预测控制/中点电位平衡/冗余矢量/交直流混合配电网/固定开关频率Key words
T-type three-level bidirectional converter/model predictive control/midpoint potential balance/redundant vectors/AC-DC hybrid distribution network/fixed switching frequency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