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An order reduction method for grid-forming converter model considering small signal stability of inner loop control
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Aiguo LIU1, Jiaqi MAO1, Yanqiao CHEN2, Lulu ZHAO2, Jingjia LI2, Xiwang·Abuduwayiti3
Thermal Power Generation | 2024, 53(8) : 38 - 50
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Thermal Power Generation | 2024, 53(8): 38-50
• Operation control technology of grid-forming energy storage technology •
An order reduction method for grid-forming converter model considering small signal stability of inner loop control
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Aiguo LIU1, Jiaqi MAO1, Yanqiao CHEN2, Lulu ZHAO2, Jingjia LI2, Xiwang·Abuduwayiti3
Affiliations
  • 1.CHN Energy Ningdong New Energy Co., Ltd., Yinchuan 751400, China
  • 2.CHN Energy New Energy Technology Research Institute Co., Ltd., Beijing 102211, China
  • 3.School of Electrical Engineering, Xinjiang University, Urumqi 830047, China
Published: 2024-08-25 doi: 10.19666/j.rlfd.202404096
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With the deepening of power electronicization in power system, grid-forming converters with voltage source characteristics will become conventional equipment in modern power systems. In order to conduct accurate and efficient control and operation analysis for power systems equipped with grid-forming equipment and to study their safety and stability characteristics, it is necessary to reduce the complexity of grid-forming converter model with strong nonlinear characteristics. Conventional simplification methods based on current loops and voltage control loops neglect the potential effect of inner loop control and line coupling impedance on the synchronous stability of the equipment. Ensuring the accuracy of stability analysis can be challenging in certain scenarios. Therefore, based on the existing order reduction methods, fully considering the small-signal characteristics of inner loop control and the influence of line coupling impedance, a series of improved simplified models are proposed. Moreover, the adaptability of each simplified model to frequency domain, eigenvalues, and time domain analysis is discussed. It turns out that there is no simplified model that can always maintain high accuracy in all scenarios. It is concluded that the simplification method needs to be changed according to the scenario. According to the analysis results, the relevant basis for selecting the simplified model of the converter and adjusting the control parameters is summarized.

grid-forming  /  converter control  /  model order reduction  /  small-signal stability
Aiguo LIU, Jiaqi MAO, Yanqiao CHEN, Lulu ZHAO, Jingjia LI, Xiwang·Abuduwayiti. An order reduction method for grid-forming converter model considering small signal stability of inner loop control[J]. Thermal Power Generation, 2024 , 53 (8) : 38 -50 . DOI: 10.19666/j.rlfd.202404096
Funding
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  • Science and Technology Projects of CHN Energy(GJNY-23-119)
  • National Key Research and Development Program(2021YFB150700)
Appendix
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Year 2024 volume 53 Issue 8
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Article Info
doi: 10.19666/j.rlfd.202404096
  • Receive Date：2024-04-23
  • Online Date：2026-01-07
  • Published：2024-08-25
Article Data
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History
  • Received：2024-04-23
Funding
Science and Technology Projects of CHN Energy(GJNY-23-119)
National Key Research and Development Program(2021YFB150700)
Affiliations
    1.CHN Energy Ningdong New Energy Co., Ltd., Yinchuan 751400, China
    2.CHN Energy New Energy Technology Research Institute Co., Ltd., Beijing 102211, China
    3.School of Electrical Engineering, Xinjiang University, Urumqi 830047, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202404096
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