电工技术学报  2023, Vol. 38 Issue (4): 970-982    DOI: 10.19595/j.cnki.1000-6753.tces.220202
电力电子 |
一种独立光储发电系统用宽输入范围非隔离三端口变换器
高圣伟1,2, 祝庆同1,2
1.天津工业大学电气工程学院 天津 300387;
2.天津市电气装备智能控制重点实验室 天津 300387
A Wide Input Range Non-Isolated Three-Port Converter for Stand-Alone PV Storage Power Generation System
Gao Shengwei1,2, Zhu Qingtong1,2
1. School of Electrical Engineering TianGong University Tianjing 300387 China;
2. Tianjin Key Laboratory of Intelligent Control of Electrical Equipment Tianjing 300387 China
全文: PDF (4064 KB)   HTML
输出: BibTeX | EndNote (RIS)      
摘要 针对独立光储发电系统中光伏电池输入电压的不稳定性,提出一种能够在大于和小于储能端口电压范围内工作的宽输入范围非隔离三端口变换器,可以实现光伏电池、蓄电池和负载之间的能量流动和功率平衡。该文所提变换器是由传统的Buck、Boost和Buck-Boost变换器分别与双向升降压四开关Buck-Boost(FSBB)变换器进行组合得到。FSBB用于连接光伏电池和蓄电池端口,可以削弱储能端口电压对光伏端口电压的约束,满足光伏端口宽电压输入的应用需求,增加了系统的稳定性。该文以Boost变换器和FSBB变换器进行组合为例设计实验样机,通过实验验证了该变换器理论分析的正确性和所提控制策略的可行性。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
高圣伟
祝庆同
关键词 三端口变换器宽输入范围四开关Buck-Boost电压约束控制策略    
Abstract:Due to the increasing scarcity of traditional fossil energy sources such as oil and coal, new energy sources represented by solar energy have been commonly developed. Conventional two-port converters are used in new energy generation systems with energy storage ports, which have problems such as a large number of converters, large size, and low power density. In contrast, a three-port converter (TPC) only needs one converter to complete the power management and energy control between the PV, battery, and load, which has the advantages of high efficiency, high integration, and centralized energy management. Non-isolated TPCs are limited in application because they do not have transformers for port voltage matching, and the voltage constraints between ports are often severe. In recent years, some non-isolated TPC proposed still have problems such as serious inter-port voltage constraints, many power devices, and low efficiency. Therefore, this paper proposes a non-isolated TPC with a wide input range. This topology can work when the PV cell voltage is greater or less than the battery voltage, and the energy from the PV port flows to the load port without passing through the battery port. It meets the application requirements of the PV port voltage variation with a wide input range and improves the system’s efficiency.
First, this paper uses the conventional Buck, Boost, and Buck-Boost converters as the channel connecting the PV port and the load port, and the bidirectional boost FSBB converter as the channel connecting the PV and the battery. A power flow path is added for connecting the battery and the load to obtain the proposed wide input range non-isolated TPC. Then, three topologies of FS-Boost TPC, FS-buck TPC, and FS-Buck-Boost TPC are compared and analyzed from the number of devices, voltage constraint range, and whether the output voltage at the load side is negative polarity. The FS-Boost TPC is superior. Finally, the operating principle and steady-state characteristics of this converter under the three constraints of Vo>Vpv>Vb, Vo>Vb>Vpv, and Vb>Vo>Vpv are analyzed with FS-Boost as an example.
Secondly, the control strategy of FS-Boost TPC is designed. For realizing three functions of constant output voltage, battery protection, and maximum power point tracking (MPPT), the designed strategy can be switched between Single Input Single Output-Battery (SISO-B) mode, Double-Input (DI) mode, Double-Output (DO) mode and Single Input Single Output-PV (SISO-P) mode according to the power relationship between ports. Finally, the control strategies are described in detail with Vo>Vpv>Vb, and Vo>Vb>Vpv as examples, and the corresponding modulation strategies are given.
Finally, the FS-Boost TPC experimental prototype is built, and the steady-state and dynamic switching experiments are completed under the two constraints of Vo>Vpv>Vb and Vo>Vb>Vpv. The experimental study shows that the proposed FS-Boost TPC can operate stably in four operating modes and complete the switching between modes with the switching time within 4 ms.The efficiency of the system in DI mode and DO mode is tested, and the maximum output efficiency of the topology is 97.8% in the test range. The topology efficiency decreases with the increase of the input power. The smaller the PV voltage is for the same PV input power, the lower the output efficiency of the converter.
Through theoretical and experimental analysis, the following conclusions can be obtained: (1) The proposed topology can work in applications where the PV voltage is greater or less than the battery voltage and meets the practical application requirements of a wide input range of PV voltage variations. (2) The control strategy design can ensure constant output voltage at the load side and fast switching between the four operating modes. Therefore, the proposed wide-input-range three-port converter is suitable for stand-alone PV storage power generation systems consisting of PV, batteries, and loads.
Key wordsThree-port converter    wide input rang    four-switch Buck-Boost    voltage constraint    control strategy   
收稿日期: 2022-02-15     
PACS: TM46  
基金资助:国家自然科学基金项目(51807139)和天津科技规划项目(20YDTPJC01520)资助
通讯作者: 祝庆同 男,1998年生,硕士研究生,研究方向为电力电子技术与应用。E-mail: 1922981934@qq.com   
作者简介: 高圣伟 男,1978年生,教授,硕士生导师,研究方向为电力电子技术与应用。E-mail: gaoshenwei@tiangong.edu.cn
引用本文:   
高圣伟, 祝庆同. 一种独立光储发电系统用宽输入范围非隔离三端口变换器[J]. 电工技术学报, 2023, 38(4): 970-982. Gao Shengwei, Zhu Qingtong. A Wide Input Range Non-Isolated Three-Port Converter for Stand-Alone PV Storage Power Generation System. Transactions of China Electrotechnical Society, 2023, 38(4): 970-982.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.220202          https://dgjsxb.ces-transaction.com/CN/Y2023/V38/I4/970