Improved control strategy of multi-inverter parallel based on virtual synchronous generator

被引：0
|
作者：
Wan X.-F. [1 ]
Zhan Z.-L. [1 ]
Ding X.-H. [1 ]
Xi R.-X. [1 ]
Wang S.-L. [2 ]
机构：
[1] School of Information Engineering, Nanchang University, Nanchang
[2] State Grid Jiangxi Electric Power Co., Ltd., Nanchang
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2020年 / 24卷 / 02期
关键词：
Circulation current suppression; Dynamic virtual complex impedance; Power sharing; Virtual synchronous generator parallel; Voltage drop;
D O I：
10.15938/j.emc.2020.02.015
中图分类号：
学科分类号：
摘要：
Aiming at the difference of equivalent output impedance and transmission line impedance between inverters in low-voltage microgrid, and the problem that power sharing and circulation suppression is less effective when multi-inverters parallel controlled by the traditional virtual synchronous generator (VSG), an improved control strategy of multi-inverter parallel based on virtual synchronous generator was proposed. Load voltage negative feedback and integral links in reactive power loop were introduced, load voltage fluctuation and decoupling reactive power distribution and transmission impedance were reduced, which improves reactive power distribution accuracy. Secondly, the dynamic virtual complex impedance was introduced to reduce the VSG output voltage drop and improve the power quality. Finally, the design of the presynchronization unit was carried out to reduce the instantaneous current impact and accelerate the dynamic response. The improved parallel control strategy of virtual synchronous generator can stabilize the output voltage in the normal range, and achieve the equal power sharing and have the circulating current restraning ability. The simulation and experimental results verify effectiveness of the proposed control strategy. © 2020, Harbin University of Science and Technology Publication. All right reserved.
引用
收藏
页码：118 / 127
页数：9
相关论文
共 18 条
  • [1] Yang X., Su J., Lu Z., Et al., Overvie on microgrid technology, Proceedings of the CSEE, 34, 1, (2014)
  • [2] Lu Z., Sheng W., Liu H., Et al., Application and challenge of virtual synchronous machine technology in power system, Proceedings of the CSEE, 37, 2, (2017)
  • [3] Zheng T., Chen L., Chen T., Et al., Review and prospect of virtual synchronous generator technologies, Automation of Electric Power Systems, 39, 21, (2015)
  • [4] He J., Li Y., Guerrero J.M., Et al., An Islanding microgrid power sharing approach using enhanced virtual impedance control scheme, IEEE Transactions on Power Electronics, 28, 11, (2013)
  • [5] Zhu Y., Li Q., Sun X., Et al., Improved droop control strategy for inverters of mismatch parameters in microgrid, Electric Machines and Control, 20, 4, (2016)
  • [6] Song C., Guo Y., Zeng Z., Et al., Operation method for grid-connected inverter parallel system with common DC link, Electric Machines and Control, 21, 12, (2017)
  • [7] Mai Q., Chen M., P-V/Q-f droop control strategy with virtual impedance for low-voltage microgrid with multiple micro sources, Power System Protection and Control, 46, 1, (2018)
  • [8] Yi G., Liu Y., Hu R., New control strategy on paralleled operation of distributed generation, Electric Machines and Control, 20, 3, (2016)
  • [9] Zhong Q.C., Zeng Y., Universal droop control of inverters with different types of output impedance, IEEE Access, 4, (2016)
  • [10] Wang Y., Luo A., Jin G., Improved robust droop multiple loop control for parallel inverts in microgrid, Transactions of China Electrotechnical Society, 30, 22, (2015)
12