三端口直流微网母线电压控制器及多目标控制

doi:10.19595/j.cnki.1000-6753.tces.L80346

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摘要

提出一种混合储能三端口直流微网母线电压控制器及多目标控制方法。三端口母线电压控制器采用LCLC多谐振结构,可对基频和三倍频能量进行传递,提高能量传递效率。谐振腔电流为基频和三倍频电流的叠加,有效地降低了谐振腔电流峰值。针对LCLC多谐振三端口双向DC-DC变换器中变压器漏感导致超级电容端口与蓄电池端口之间存在功率耦合,无法实现独立控制的问题,建立了端口间的功率耦合模型,并提出了从变换器硬件参数以及驱动频率选择的角度出发减小功率耦合的方法。此外,提出了一种驱动频率最优化控制方法,根据变换器的输出功率调节工作频率,以保证变换器全负载范围内的软开关以及效率最优。同时,提出了兼顾直流母线电压波动快速调节、混合储能能量分配以及三端口变换器驱动频率最优的多目标控制策略。最后,设计一台1.5 kW实验样机,并模拟了直流微网功率波动实验场景。实验结果验证了拓扑结构、参数设计、三端口变换器多目标控制方法的可行性和有效性。

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	李微
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	杨良

关键词 ：直流微网, 母线电压控制, 混合储能, 三端口变换器

Abstract：

In this paper, a multi-resonant three-port DC microgrid bus voltage controller with hybrid energy storage of super-capacitor and battery is proposed, and corresponding multi-objective control method is investigated. The LCLC multi-resonant tank can transfer the energy of fundamental and third order frequencies to increase efficiency of the converter. The resonant current combines fundamental and third harmonics, and its peak value is effectively reduced. Moreover, the energy coupling phenomenon between the super-capacitor and the battery ports in the LCLC multi-resonant three-port bidirectional DC-DC converter caused by the leakage inductance of transformer is analyzed, and the decoupling method is proposed. Besides, a driving frequency optimization control method is investigated. By adjusting the operating frequency along with the load variations, the desirable zero voltage switching (ZVS) characteristics and high efficiency are guaranteed in full load range. At the same time, a multi-objective control method is fabricated for the DC microgrid bus voltage controller. The main control objectives contain three aspects: maintaining the stability of the DC bus voltage, energy distribution of hybrid energy storage system and adjusting driving frequency for efficiency optimization. At last, a 1.5kW prototype is built, and the experimental results verify the feasibility and effectiveness of the proposed topology, parameter design and multi-objective control method.

Key words： DC microgrid bus voltage control hybrid energy storage three-port converter

收稿日期: 2018-07-01 出版日期: 2019-01-10

PACS:

TM46

基金资助:

国家自然科学基金项目（51877152）和天津市复杂系统控制理论及应用重点实验室开放基金项目（TJKL-CTACS-201902）资助

通讯作者: 周雪松男,1964年生,博士,教授,研究方向为电力系统非线性控制、新能源利用与智能电网。E-mail：sjteam@163.com

作者简介: 李微女,1990年生,博士,讲师,研究方向为直流微网母线电压控制及谐振型软开关三端口变换器。E-mail：liweitjut@163.com

引用本文:

李微, 周雪松, 马幼捷, 高志强, 杨良. 三端口直流微网母线电压控制器及多目标控制[J]. 电工技术学报, 2019, 34(1): 92-102. Li Wei, Zhou Xuesong, Ma Youjie, Gao Zhiqiang, Yang Liang. Three-Port DC Microgrid Bus Voltage Controller and Multi-Objective Control. Transactions of China Electrotechnical Society, 2019, 34(1): 92-102.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.L80346 https://dgjsxb.ces-transaction.com/CN/Y2019/V34/I1/92

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