基于三相桥光储一体系统的建模与控制
Study on the modeling and control of photo-storage integrated system based on the three-phase bridge
巫付专 1齐伟立 1苗斌玉1
作者信息
- 1. 中原工学院电子信息学院,河南郑州 450007
- 折叠
摘要
为解决光伏发电具有波动性且伴有"弃光"现象的问题,提出了一种基于三相桥的光储一体转换器拓扑结构及相关控制策略.该结构能够实现光伏电源、蓄电池、负载之间的功率流动,并具有LLC谐振变换器的软开关性质、高效率、输入电压范围适应性更宽、高功率密度等优点.在控制策略方面,采用带有复合反馈的电导增量法来实现最大功率点跟踪;为实现双向DC-DC变换器共用电感和直流母线电压稳定,采用双频率控制方法确定电感,并实现电压外环电流内环双闭环控制;为保证输出负载电压稳定,LLC谐振转换器采用电压闭环的调频控制.最后,搭建了光储一体系统仿真模型与实验平台,仿真与实验结果表明:提出的新型光储一体系统结构简单,可以稳定运行且易于实现.
Abstract
In order to solve the problem of photovoltaic power generation with fluctuation and the phenomenon of"light abandonment",this paper proposes a topological structure of optical storage converter based on three-phase bridge and its related control strategy.The structure can realize the power flow between photovoltaic power supply,battery and load,and has the advantages of soft switching properties of LLC resonant converters,high efficiency,wider adaptability to the input volt-age range,and high power density.In terms of control strategy,the maximum power point tracking is realized by using the conductance increment method with compound feedback.In order to realize the voltage stability of the common inductor and the DC bus of the bidirectional DC-DC converter,the du-al frequency control method is used to determine the double closed-loop control of inductor and the outer loop of voltage and the inner loop of current.To ensure the voltage stability of the output load,the LLC resonant converter adopts the frequency modulation control of voltage closed-loop.Finally,the simulation model and experimental platform of the integrated optical storage system are built.The simulation and experimental results show that the new optical storage system is simple in structure,stable in operation and easy to implement.
关键词
光储一体转换器拓扑/三相桥/谐振转换器Key words
optical storage integrated converter topology/three-phase bridge/resonant converter引用本文复制引用
出版年
2024
NETL
NSTL
万方数据