一种无需高带宽通信线路的高精度自主均流控制策略

doi:10.19595/j.cnki.1000-6753.tces.200738

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摘要直流微电网并联系统多采用下垂控制实现功率分配,但线路阻抗的存在会降低其分配精度,传统均流策略基于高带宽通信网络采集电压或电流信息实现功率补偿,制造成本偏高、可靠性较低,同时通信线路存在通信延时,会对均流效果产生影响。为实现直流微电网并联系统变换器输出功率自主均分控制,提出一种无高带宽通信线路的直流微电网并联光储变换器均流策略。该策略通过分析恒压运行模式与下垂运行模式下,线路阻抗对并联变换器功率分配特性的影响规律,设计虚拟阻抗补偿环节,根据变换器自身输出电气特性,对变换器输出功率进行调节,实现输出功率的自主均分。仿真和实验结果表明,所提控制策略能够提高并联变换器的功率自主分配精度。

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	支娜
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	黄庆辉
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关键词 ：直流微电网, 自主均流策略, 虚拟阻抗补偿

Abstract：The DC microgrid parallel systems mostly use droop control to achieve power distribution. However, the line impedance will reduce power distribution precision. The traditional current sharing strategy is based on high-bandwidth communication lines, which has high manufacturing cost and low reliability. In addition, the communication delay in the communication line will affect the power distribution precision. In this paper, an optical autonomous current sharing strategy of parallel storage converters in the DC microgrid is proposed. This strategy analyzes the influence of line impedance on the power distribution characteristics of the converter in constant voltage operation mode and droop operation mode. A virtual impedance compensation link is designed to adjust the output power of the converter according to the output electrical characteristics of the converter, and then, the output power of each converter is equally shared. The effectiveness of the proposed parallel system autonomous current sharing strategy is verified by simulation and experiment.

Key words： DC microgrid autonomous current sharing strategy virtual impedance compensation

收稿日期: 2020-06-30

PACS:

TM727

基金资助:国家自然科学基金面上项目（51877175）、陕西省重点项目（2017ZDXM-GY-003）和陕西省自然基金项目（2017JM5100）资助

通讯作者: 丁可男,1995年生,硕士研究生,研究方向为直流微电网及其协调控制。E-mail: 1597436271@qq.com

作者简介: 支娜女,1976年生,博士,副教授,研究方向为新能源发电及微电网控制。E-mail: zhina@xaut.edu.cn

引用本文:

支娜, 丁可, 黄庆辉, 李武华, 张辉. 一种无需高带宽通信线路的高精度自主均流控制策略[J]. 电工技术学报, 2021, 36(16): 3375-3385. Zhi Na, Ding Ke, Huang Qinghui, Li Wuhua, Zhang Hui. An High Precision Autonomous Current Sharing Control Strategy without High Bandwidth Communication Line. Transactions of China Electrotechnical Society, 2021, 36(16): 3375-3385.

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