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Adaptive Anti-Saturation Control Design of Transformers in Converter-Based Grid Emulators
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  • Zejie Li,
  • Fangzhou Zhao ,
  • Florian Hans,
  • Stig Munk-Nielsen ,
  • Xiongfei wang
Zejie Li
Aalborg University

Corresponding Author:[email protected]

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Fangzhou Zhao
Aalborg University
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Florian Hans
Fraunhofer Institute for Wind Energy Systems IWES
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Stig Munk-Nielsen
Aalborg University
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Xiongfei wang
KTH Royal Institute of Technology and Aalborg University
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Transformer saturation is a common issue in megawatt converter-based grid emulators (GEs) when emulating grid faults. This problem necessitates the use of anti-saturation control (ASC) with GEs. However, conventional ASC methods tend to distort the emulated grid voltage or even interact with the voltage control (VC) of GEs, causing instability of the system. This paper, thus, proposes an adaptive ASC method and superimposes its output command to both modulation and VC references, which not only alleviate transformer saturation with the minimized voltage distortion, but mitigate its adverse interaction with the VC of converter-based GEs. Experimental results confirm the effectiveness of the adaptive ASC.
15 Dec 2023Submitted to TechRxiv
21 Dec 2023Published in TechRxiv