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。
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.
作者
王勋嵩
李锐华
许嘉杰
王汉卿
WANG Xunsong;LI Ruihua;XU Jiajie;WANG Hanqing(College of Electronic and Information Engineering,Tongji University,Shanghai 201804,China;State Grid Shanghai Jiading Electric Power Supply Company,Shanghai 201800,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2024年第3期1264-1271,共8页
High Voltage Engineering
基金
国家自然科学基金(52207243)。
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
T-type three-level bidirectional converter
model predictive control
midpoint potential balance
redundant vectors
AC-DC hybrid distribution network
fixed switching frequency
