An improved droop control strategy for a DC microgrid based on line resistance observations

被引：0
|
作者：
Ning X. [1 ]
Pan H. [1 ,2 ]
Li F. [1 ,2 ]
Wu J. [1 ]
机构：
[1] School of Electronic and Electrical Engineering, Ningxia University, Yinchuan
[2] Ningxia Key Laboratory of Electrical Energy Security, Yinchuan
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2024年 / 52卷 / 11期
基金：
中国国家自然科学基金;
关键词：
DC microgrids; droop control; line resistance; rated power; recursive least squares;
D O I：
10.19783/j.cnki.pspc.231551
中图分类号：
学科分类号：
摘要：
Accurate load power equalization and bus voltage stabilization are the main control objectives of DC microgrids. However, traditional droop control causes problems of low current distribution accuracy and significant bus voltage deviation. An improved droop control strategy based on line resistance observations is proposed to solve this shortcoming. The main reason for the uneven distribution of the output current of each converter is the mismatch of line resistance. The line resistance is first estimated using the recursive least squares method. The droop coefficient is adjusted using the estimated line resistance value. Then further considering that the rated power of each converter is different, the droop coefficient is adjusted according to the rated power of the converter so that the output current of each converter is distributed in proportion to its rated power. Finally, an islanded DC microgrid model is constructed on the Matlab/Simulink platform, and three different droop coefficients are simulated to verify the effectiveness and feasibility of the method for power equalization and voltage stabilization under the operating conditions of constant and variable load, and converter withdrawal. © 2024 Power System Protection and Control Press. All rights reserved.
引用
收藏
页码：42 / 51
页数：9
相关论文
共 30 条
  • [21] DONG C, LIE X, LIANGZHONG Y., DC voltage variation based autonomous control of DC microgrids, IEEE Transactions on Power Delivery, 28, 2, pp. 637-648, (2013)
  • [22] FU Jianzhe, GUO Kunli, YAN Dong, Research on active disturbance rejection control strategy of bidirectional DC-DC converter in DC microgrid, Foreign Electronic Measurement Technology, 39, 3, pp. 47-52, (2020)
  • [23] HUANG Chongxin, CHEN Zhenyu, DENG Song, Voltage-power coordinated control of a dual-bus DC microgrid with energy storage, Power System Protection and Control, 51, 11, pp. 141-149, (2023)
  • [24] MI Y, GUO J, FU Y, Et al., Accurate power allocation of multienergy storage island DC microgrid based on virtual power rating, IEEE Transactions on Power Electronics, 38, 1, pp. 261-270, (2022)
  • [25] CAO J, DU W, WANG H F, Et al., Minimization of transmission loss in meshed AC/DC grids with VSC-MTDC networks, IEEE Transactions on Power Systems, 28, 3, pp. 3047-3055, (2013)
  • [26] LU X, GUERRERO J M, SUN K, Et al., Hierarchical control of parallel AC-DC converter interfaces for hybrid microgrids, IEEE Transactions on Smart Grid, 5, 2, pp. 683-692, (2013)
  • [27] ZHAO Kelun, JIANG Jinghong, DENG Jin, Et al., Parameter identification method of lithium battery equivalent circuit model based on forgetting factor recursive least squares, Electronic Measurement Technology, 45, 16, pp. 87-92, (2022)
  • [28] ZHANG Haiyang, LIANG Quan, WANG Zhike, Et al., Control strategy of valve-controlled cylinder hydraulic system based on recursive least squares method, Mechatronic Engineering, 40, 11, pp. 1743-1751, (2023)
  • [29] MI Yang, CAI Hangyi, SONG Genxin, Et al., State-of-charge balancing research of distributed energy storage units with unmatched line impedance, Proceedings of the CSEE, 39, 15, pp. 4441-4451, (2019)
  • [30] YANG J, JIN X, WU X, Et al., Decentralized control method for DC microgrids with improved current sharing accuracy, IET Generation Transmission & Distribution, 11, 3, pp. 696-706, (2017)
123