Modeling and stability improvement methods for grid-connected systems of heterogeneous distributed photovoltaic interconnected inverters

Authors

• Diyang Gong, Electric Power Research Institute ， State Grid Zhejiang Electric Power Co .， Ltd.， Hangzhou 310007， ChinaFollow
• Xiangjin Wang, Electric Power Research Institute ， State Grid Zhejiang Electric Power Co .， Ltd.， Hangzhou 310007， China
• Junhao Li, National Electric Power Conversion and Control Engineering Technology Research Center （Hunan University ） ， Changsha 410082， China
• Jiayuan Gao, School of Electrical & Information Engineering ， Changsha University of Science & Technology ， Changsha 410004， China
• Shuai Huang, School of Electrical & Information Engineering ， Changsha University of Science & Technology ， Changsha 410004， China

Keywords

grid-following, grid-forming, grid impedance, active amplitude phase angle compensation, stability

Abstract

After grid-following and grid-forming heterogeneous interconnected photovoltaic inverters are connected to the power grid, interactive influences easily occur, resulting in the instability of grid-connected inverters and threatening the safe and stable operation of the new energy grid-connected system. Therefore, considering the dynamic influence of photovoltaic direct current side voltage, small-signal impedance models of grid-following, grid-forming, and their interconnected heterogeneous distributed photovoltaic inverters connected to the grid were constructed, respectively, and the adaptability of heterogeneous grid-connected inverters to grid impedance was analyzed. Meanwhile, to expand the adaptation range of heterogeneous interconnected systems to grid impedance and promote the consumption of new energy, starting from the frequency characteristics of the eigenvalues of the return ratio matrices of grid-following and grid-forming inverters, a hybrid control strategy involving asymmetric compensation for grid-following inverters and active amplitude phase angle compensation for grid-forming inverters was proposed, and the control parameter design was completed to enhance the adaptability of heterogeneous interconnected systems to the grid. The correctness of the related theoretical analysis is verified by simulation and experiment.

DOI

10.19781/j.issn.1673-9140.2026.03.026

First Page

280

Last Page

294

Recommended Citation

Gong, Diyang; Wang, Xiangjin; Li, Junhao; Gao, Jiayuan; and Huang, Shuai (2026) "Modeling and stability improvement methods for grid-connected systems of heterogeneous distributed photovoltaic interconnected inverters," Journal of Electric Power Science and Technology: Vol. 41: Iss. 3, Article 26.
DOI: 10.19781/j.issn.1673-9140.2026.03.026
Available at: https://jepst.researchcommons.org/journal/vol41/iss3/26