• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 54 Issue 6
Nov.  2019
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Article Contents
Journal of Southwest Jiaotong University  > 2019  >  54(6): 1323-1331.
CHEN Weirong, YU Jin, LI Qi, PU Yuchen, YANG Hanqing, HAN Ying. Balanced Current Control Method for Virtual Synchronous Generator in Electro-Hydrogen Multi-Energy Complementary Microgrid[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1323-1331. doi: 10.3969/j.issn.0258-2724.20180860
Citation: CHEN Weirong, YU Jin, LI Qi, PU Yuchen, YANG Hanqing, HAN Ying. Balanced Current Control Method for Virtual Synchronous Generator in Electro-Hydrogen Multi-Energy Complementary Microgrid[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1323-1331. doi: 10.3969/j.issn.0258-2724.20180860
shu

Balanced Current Control Method for Virtual Synchronous Generator in Electro-Hydrogen Multi-Energy Complementary Microgrid

doi: 10.3969/j.issn.0258-2724.20180860
  • Received Date: 29 Oct 2018
  • Rev Recd Date: 06 Mar 2019
    • Available Online: 13 Jun 2019
  • Publish Date: 01 Dec 2019
    Abstract
  • The multi-energy complementary microgrid concentrates multiple complementary energy sources in the same grid-connected system, which can effectively improve energy utilization efficiency and power supply reliability of the microgrid. Virtual synchronous generator (VSG) technology enables friendly networking of distributed power supplies. However, in the case of non-ideal operation, the traditional VSG control does not have the ability to suppress the negative sequence current when the grid voltage is unbalanced, which will lead to the imbalance of the three-phase grid-connected current of the microgrid. To solve this problem, a VSG balanced current control method based on electro-hydrogen multi-energy complementary microgrid is proposed. This work builds a power system model including photovoltaic and energy storage systems, and a hydrogen energy system model including an electrolytic cell-hydrogen storage-fuel cell system. Then, the basic principle of VSG is analyzed, and through the analysis of the VSG grid-connected small-signal model, the system parameters and control parameters are designed to improve system stability margin. The causes of the unbalanced current are shown in a way of quantitative analysis. In addition, by improving the current command calculation method in the dq coordinate system, it is able to suppress the negative sequence current and ensure the power quality of the electro-hydrogen multi-complementary microgrid. Finally, the energy management strategy of multi-energy complementary microgrid is verified to be effective by simulation. The simulation results show that the VSG balanced current control method can achieve the three-phase balance of the grid-connected current in the case of voltage imbalance and the inrush current is suppressed from 52 A to 27 A. Furthermore, it significantly reduces power fluctuations.

     

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