基于回路增益的直流微电网母线阻抗在线估计及其抑制技术
CSTR:
作者:
作者单位:

(1.山东石油化工学院智能制造与控制工程学院,山东 东营 257061;2.中国石化集团胜利石油管理局有限公司新能源开发中心,山东 东营 257061)

通讯作者:

李凤霞(1986—),女,硕士,讲师,主要从事直流微电网、工业自动化研究;E?mail:Lifengxia_lfx@163.com

中图分类号:

TM863

基金项目:

中国石化胜利油田分公司科技推广项目(GT2004);国家科技重大专项(2017ZX03013?001);山东省自然科学基金


On‑line estimation and suppression technology of DC microgrid bus impedance based on loop gain
Author:
Affiliation:

(1.College of Intelligent Manufacturing and Control Engineering,Shandong Institute of Petrochemical and Chemical Technology,Dongying,257061,China;2.China Sinopec Shengli Petroleum Administration Bureau,Dongying,257061,China)

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    摘要:

    在现代直流微电网中,分布式电源通过电力电子变流器连接到公共直流母线,尽管变流器的控制回路具有良好的稳定裕度,但多个变流器的互连可能会影响微电网动态性能和稳定性。因此,为确保多变流器系统所需的动态性能,提出一种基于电压回路相位裕度的直流母线阻抗峰值估计方法,在此基础上进一步提出一种直流母线阻抗的优化控制方案,并通过实验验证所提控制方法的有效性。首先根据源侧变流器的电压控制回路增益推导出直流母线阻抗的表达形式;然后,通过合理的假设,基于电压控制回路的相位裕度估计出直流母线阻抗峰值;最后,通过在电压控制回路中注入正弦信号来连续监测母线阻抗的峰值,通过优化电压调节器的控制参数,有效降低直流母线阻抗峰值。实验结果表明,所提监测方案能够降低测量任务及计算负担,同时,优化控制方案提高直流微电网的稳定性和动态性能。

    Abstract:

    In modern DC microgrids, distributed power sources are connected to the common DC bus through power electronic converters. Although the control loop of the converter has good stability margin, the interconnection of multiple converters may affect the microgrid dynamic performance and stability. Therefore, in order to ensure the required dynamic performance of the multi?converter system, a DC bus impedance peak estimation method based on the phase margin of the voltage loop is proposed in this paper. On this basis, an optimized control scheme for the DC bus impedance is further proposed. And through experiments to verify the effectiveness of the proposed control method. First, derive the expression of DC bus impedance based on the voltage control loop gain of the source?side converter; then, through reasonable assumptions, the DC bus impedance peak value is estimated based on the phase margin of the voltage control loop; finally, through the voltage control A sinusoidal signal is injected into the loop to continuously monitor the peak value of the bus impedance. By optimizing the control parameters of the voltage regulator, the peak value of the DC bus impedance is effectively reduced. The experimental results show that the proposed monitoring scheme could reduce the measurement and the calculation burden, and the optimized control scheme improves the stability and dynamic performance of the DC microgrid.

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引用本文

李凤霞,李凤名,刘庆娟.基于回路增益的直流微电网母线阻抗在线估计及其抑制技术[J].电力科学与技术学报,2023,38(1):154-163.
LI Fengxia, LI Fengming, LIU Qingjuan. On‑line estimation and suppression technology of DC microgrid bus impedance based on loop gain[J]. Journal of Electric Power Science and Technology,2023,38(1):154-163.

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  • 在线发布日期: 2023-04-10
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