Virtual Positive-damping Reshaped Control for Bidirectional Grid-connected Converter in Weak Grid

被引：0
|
作者：
Yao M. [1 ]
Li F. [2 ]
Li J. [2 ]
机构：
[1] Power Dispatching Control Center of State Grid Heilongjiang Electric Power Co., Ltd., Harbin
[2] Beijing Kedong Power Control System Co., Ltd., State Grid Power Research Institute, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 03期
基金：
中国国家自然科学基金;
关键词：
grid-connected converter; impedance analysis; positive-damping reshaped; power control; small signal modeling; stability analysis; weak current network;
D O I：
10.13336/j.1003-6520.hve.20211861
中图分类号：
学科分类号：
摘要：
Aiming at the problem that the system stability of bidirectional grid connected converter in constant power control mode under weak current network will vary due to different power transmission directions, resulting in system oscillation and even instability, this paper proposes a virtual positive damping remodeling control strategy, which reshapes the negative impedance into positive impedance, enhances the system damping, and improves the stability. Firstly, the small signal model of AC side port impedance of bidirectional grid connected converter in d-q coordinate system is established in detail, and the differences of impedance characteristics in different power directions are analyzed. Secondly, combined with the expression of system minimum loop ratio and grid equivalent impedance, based on the Nyquist stability criterion, the effects of grid equivalent impedance and power transmission direction on system stability are analyzed. Then, the virtual positive damping remodeling control strategy of bidirectional inverter under weak current network is analyzed, modeled and analyzed. The results show that the virtual positive damping reshaping control can reshape the negative impedance into positive impedance and enhance the system damping. Moreover, even in the weak current network with large equivalent impedance, the system can maintain good bidirectional power stability. Finally, the effectiveness of the proposed strategy is verified by using the MATLAB / Simulink and low-power experimental platform. © 2023 Science Press. All rights reserved.
引用
收藏
页码：1294 / 1304
页数：10
相关论文
共 20 条
  • [1] SI Xinyao, ZHAO Jinghan, YU Miao, Et al., Decentralized bidirectional voltage support control method available for multi-voltage level DC distribution network, Electric Power Automation Equipment, 41, 5, pp. 114-120, (2021)
  • [2] LI Xiangjun, WANG Shangxing, HUI Dong, Summary and prospect of operation control and application method for battery energy storage systems, Power System Technology, 41, 10, pp. 3315-3325, (2017)
  • [3] WANG Yuting, Study on multi-port bi-directional energy router in energy internet, (2016)
  • [4] TANG C Y, CHEN Y F, CHEN Y M, Et al., DC-link voltage control strategy for three-phase back-to-back active power conditioners, IEEE Transactions on Industrial Electronics, 62, 10, pp. 6306-6316, (2015)
  • [5] ZHANG Bo, Research on three-phase back-to-back converter, (2017)
  • [6] AMIN M, MOLINAS M, LYU J, Et al., Impact of power flow direction on the stability of VSC-HVDC seen from the impedance Nyquist plot, IEEE Transactions on Power Electronics, 32, 10, pp. 8204-8217, (2017)
  • [7] JIANG Yuxia, TIAN Yanjun, LI Yonggang, Analysis of the influence of active power load fluctuation on the stability of distributed generation grid-connected inverter and improved control strategy, Power System Technology, 44, 2, pp. 646-654, (2020)
  • [8] ZHANG X G, XIA D N, FU Z C, Et al., An improved feedforward control method considering PLL dynamics to improve weak grid stability of grid-connected inverters, IEEE Transactions on Industry Applications, 54, 5, pp. 5143-5151, (2018)
  • [9] TU Chunming, GAO Jiayuan, ZHAO Jinbin, Et al., Analysis and design of grid-connected inverter impedance remodeling with fixed stability margin in weak grid, Transactions of China Electrotechnical Society, 35, 6, pp. 1327-1335, (2020)
  • [10] WEN B, BOROYEVICH D, BURGOS R, Et al., Small-signal stability analysis of three-phase AC systems in the presence of constant power loads based on measured d-q frame impedances, IEEE Transactions on Power Electronics, 30, 10, pp. 5952-5963, (2015)
12