基于单脉冲注入的直流微电网线路阻抗检测

doi:10.19595/j.cnki.1000-6753.tces.170514

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摘要

为解决直流微电网中线路阻抗对传统下垂控制造成的影响,基于直流微电网系统结构特点,提出了一种主动阻抗检测方法,即通过主动注入单脉冲扰动,检测变换器输出电压、电流变化,获得线路阻抗信息,进而对下垂系数进行补偿,最终改善负荷分配精度和母线电压电能质量。由于该方法属于主动测量法,因此对电能质量影响微小并可控。最后通过仿真和实验结果验证了所提方法的可行性和有效性。

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	刘琛
	赵晋斌
	王闪闪
	屈克庆
	李芬

关键词 ：直流微电网, 线路阻抗, 负荷分配, 主动阻抗检测

Abstract：

InDCmicrogrid,the existence of line impedance on the parallel converteroutput side results in bad influence on the traditional droop control method.To solve this problem, this paper propose an active impedance detection method based on the DCmicrogridspecific system structure.By injectinga pulse disturbanceactively and detecting the changes of output voltage and current, the line impedance could be obtained and used to compensate the droop coefficient. This method improves the load current sharing accuracy and restores the dc bus voltage.Because the method belongs to the active impedanceidentification, the influence on power quality is tiny and controllable.Finally, simulation and experimental results validate the feasibility and effectiveness of the proposed method.

Key words： DCmicrogrid line impedance load sharing active impedance identification

收稿日期: 2017-04-24 出版日期: 2018-06-13

PACS:

TM615

基金资助:

国家自然科学基金（51777120）和上海绿色能源并网工程技术研究中心项目（13DZ2251900）资助

通讯作者: 赵晋斌男,1972年生,博士,教授,研究方向为电力电子电路的智能化及模块化控制技术、新能源发电技术。E-mail：zhaojinbin@shiep.edu.cn

作者简介: 刘琛男,1992年生,硕士研究生,研究方向为直流微电网控制与应用。E-mail：liuchen@mail.shiep.edu.cn

引用本文:

刘琛, 赵晋斌, 王闪闪, 屈克庆, 李芬. 基于单脉冲注入的直流微电网线路阻抗检测[J]. 电工技术学报, 2018, 33(11): 2584-2591. Liu Chen, ZhaoJinbin, Wang Shanshan, Qu Keqing, Li Fen. A Line Impedance Identification Based on Single Pulse Injection in DC Microgrid. Transactions of China Electrotechnical Society, 2018, 33(11): 2584-2591.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.170514 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I11/2584

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