电工技术学报  2022, Vol. 37 Issue (16): 4169-4179    DOI: 10.19595/j.cnki.1000-6753.tces.211127
电力电子 |
面向直流储能系统的飞跨电容三电平双向升降压变换器及其模型预测控制策略
樊启高, 吕华阳, 毕恺韬, 庄煜, 朱一昕
江南大学物联网工程学院 无锡 214122
Flying Capacitor Three-Level Bi-Directional Buck-Boost Converter and Its Model Predictive Control Strategy for DC Energy Storage System
Fan Qigao, Lü Huayang, Bi Kaitao, Zhuang Yu, Zhu Yixin
School of Internet of Things Engineering Jiangnan University Wuxi 214122 China
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摘要 光伏系统中直流母线电压受光伏发电端及负载影响变化范围较大,传统储能直流变换器难以适应储能侧及母线侧双端宽电压范围运行。该文提出一种适用于储能系统的飞跨电容三电平双向升降压变换器,该变换器具有对称的拓扑结构,能量向任意方向传递时,均可实现升、降压功率变换,从而解决储能系统在宽母线电压工况下的应用问题。此外,该文提出基于所提变换器的模型预测控制(MPC)策略,该策略通过建立电感电流的预测模型,引入电感电流和输出电压的双闭环控制,实现稳定输出电压的控制目标。同时,建立飞跨电容的独立预测电压闭环,在保证输出稳压的基础上,实现对双侧飞跨电容电压的独立控制。最后,通过搭建小功率实验平台验证了所提变换器及其控制策略的有效性。
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关键词 储能系统飞跨电容三电平双向直流变换器双向升降压功率变换模型预测控制    
Abstract:The DC bus voltage in the photovoltaic system is affected by the generator and load in a wide range. The traditional energy storage DC-DC converter is difficult to adapt to the wide voltage range operation of both energy storage side and bus side. This paper presents a flying capacitor three-level bi-directional Buck-Boost converter for energy storage system, which has a symmetrical topology. When the energy is transferred to any direction, it can realize the power conversion of Boost and Buck, thus solving the application problem under wide bus voltage condition. In addition, a model predictive control (MPC) strategy based on the this converter is proposed. By establishing the predictive model of the inductor current and introducing the double closed-loop control of the inductor current and output voltage, the control objective of stabilizing the output voltage is achieved. At the same time, the independent predictive voltage closed-loop of the flying capacitor is established. On the basis of ensuring the output voltage stabilization, the independent control of the voltage of the bilateral flying capacitor is realized. Finally, the effectiveness of the proposed converter and its control strategy is verified by building a small power experimental platform.
Key wordsEnergy storage system    flying capacitor three-level bi-directional DC-DC converter    bi-directional buck-boost power converter    model predictive control   
收稿日期: 2021-07-23     
PACS: TM46  
基金资助:国家自然科学基金(51807079)、江苏省自然科学基金(BK20200623)和博士后科学基金(2020M681692)资助项目
通讯作者: 毕恺韬,男,1989年生,博士,讲师,研究方向为大功率储能功率变流技术。E-mail: bkt1989@163.com   
作者简介: 樊启高,男,1986年生,博士,副教授,研究方向为新能源发电及机电一体化技术。E-mail: qgfan@jiangnan.edu.cn
引用本文:   
樊启高, 吕华阳, 毕恺韬, 庄煜, 朱一昕. 面向直流储能系统的飞跨电容三电平双向升降压变换器及其模型预测控制策略[J]. 电工技术学报, 2022, 37(16): 4169-4179. Fan Qigao, Lü Huayang, Bi Kaitao, Zhuang Yu, Zhu Yixin. Flying Capacitor Three-Level Bi-Directional Buck-Boost Converter and Its Model Predictive Control Strategy for DC Energy Storage System. Transactions of China Electrotechnical Society, 2022, 37(16): 4169-4179.
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