适用于V2G应用场合的双向DC-DC变换器优化控制策略
Optimal Control Strategy for Bidirectional DC-DC Converter under V2G Application Scenarios
凌在汛 1刘曼佳 1向慕超 1康逸群 1熊昊哲1
作者信息
- 1. 国网湖北省电力科学研究院,武汉430074
- 折叠
摘要
充电站内的双向充电堆采用引入三电平桥臂的三电平双有源全桥3L-DAB(three-level dual active bridge)DC-DC变换器,通过增加控制自由度来增强系统调节的灵活性.当采用传统移相CPS(conventional phase shift)控制时,3L-DAB电流应力较大,损耗增加,系统效率降低.针对此问题,提出一种适用于双向充电堆中DC-DC变换器的电流应力最小优化控制策略.首先建立移相控制3L-DAB的数学模型,分析电感电流有效值的各次谐波随控制自由度的变化关系.然后在此基础上,提出一种基于基波优化的控制策略来减小变换器的电感电流有效值.最后,通过比较所提优化控制和其他控制方式下的仿真与实验结果,验证了分析的正确性和所提控制策略的有效性.
Abstract
A three-level dual active bridge(3L-DAB) DC-DC converter with the introduction of 3L legs is applied to the bidirectional charging stack in a charging station,so that the system's regulating flexibility can be enhanced by adding another control degree of freedom.When the conventional phase shift(CPS) control is adopted,the current stress of the 3L-DAB converter is relatively large,which increases the loss and thus reduces the system efficiency.To address this issue,an optimal control strategy is proposed to minimize the current stress of the DC-DC converter applied to the bidirectional charging stack.First,the mathematic model of the 3L-DAB converter under phase shift control is established to analyze the relationship between the harmonics of inductance current rms and the control degrees of freedom.On this basis,a control strategy based on fundamental wave optimization is put forward to reduce the inductance current rms of the converter.Finally,the correctness of theoretical analysis and the effectiveness of the proposed control strategy are verified by comparing the simulation and experimental results among the proposed optimal control and other control methods.
关键词
电流应力最小/3L-DAB变换器/优化控制Key words
Minimum current stress/three-level dual active bridge(3L-DAB) converter/optimal control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