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Cooperative control method of multi-source grid-forming converters in weak electrical grids
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Shuo LIU1, Jiayuan LI1, Suliang MA1, Guanglin SHA2, Chengxin LI3
Thermal Power Generation | 2024, 53(8) : 85 - 93
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Thermal Power Generation | 2024, 53(8): 85-93
• Operation control technology of grid-forming energy storage technology •
Cooperative control method of multi-source grid-forming converters in weak electrical grids
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Shuo LIU1, Jiayuan LI1, Suliang MA1, Guanglin SHA2, Chengxin LI3
Affiliations
  • 1.Beijing Future Technology Innovation Centre for Electrochemical Energy Storage System Integration (North China University of Technology), Beijing 100144, China
  • 2.China Electric Power Research Institute, Beijing 100192, China
  • 3.China Railway 22nd Bureau Group Electrification Engineering Co., Ltd., Beijing 100043, China
Published: 2024-08-25 doi: 10.19666/j.rlfd.202403038
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Virtual Synchronous Generator (VSG), as one of the primary technologies in grid-forming controls, provides inertia support to the power grid. However, due to the limited capacity of individual converters, when larger inertia support is required, multiple VSGs must run in parallel, making the coordinated control of multiple VSGs a subject of significant interest. In this regard, a state-space model for multiple VSGs in parallel is established, and the system stability is analyzed through the eigenvalues of the state variable matrix. Concurrently, a coordinated control strategy for multiple VSGs based on model predictive control is proposed, which introduces the angular frequency deviation and power angle difference as performance indicators to design the objective function. The optimal active power increment required is solved, and the output angular frequency is dynamically adjusted through the power-frequency coefficient, enabling active support for the output frequency and effectively suppressing system frequency fluctuations caused by VSG paralleling, thus the grid stability is enhanced. The results indicate that, compared with the conventional VSG paralleling systems, the proposed MPC-VSG parallel control method can shorten the transient response time of the system and improve its robustness under transient conditions. The simulation result confirms the effectiveness of the proposed approach.

grid-forming converter  /  virtual synchronous generator  /  state space model  /  model predictive control  /  inertia support
Shuo LIU, Jiayuan LI, Suliang MA, Guanglin SHA, Chengxin LI. Cooperative control method of multi-source grid-forming converters in weak electrical grids[J]. Thermal Power Generation, 2024 , 53 (8) : 85 -93 . DOI: 10.19666/j.rlfd.202403038
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  • Beijing Nova Program(Z211100002121081)
Appendix
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Year 2024 volume 53 Issue 8
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Article Info
doi: 10.19666/j.rlfd.202403038
  • Receive Date：2024-03-20
  • Online Date：2026-01-07
  • Published：2024-08-25
Article Data
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  • Received：2024-03-20
Funding
Beijing Nova Program(Z211100002121081)
Affiliations
    1.Beijing Future Technology Innovation Centre for Electrochemical Energy Storage System Integration (North China University of Technology), Beijing 100144, China
    2.China Electric Power Research Institute, Beijing 100192, China
    3.China Railway 22nd Bureau Group Electrification Engineering Co., Ltd., Beijing 100043, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202403038
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