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A Flexible Saturation Limiter for DC-Link Voltage Control of Grid-Forming Inverters with Enhanced Transient Stability
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  • Cheng Luo ,
  • Xikui Ma ,
  • Teng Liu ,
  • Xiongfei Wang
Cheng Luo
Xian Jiaotong University

Corresponding Author:[email protected]

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Xiongfei Wang
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Abstract

This paper proposes a flexible saturation limiter (FSL) for dc-link voltage control (DVC) of grid-forming (GFM) inverters, to enhance transient stability under large disturbances. First, the impact of the conventional saturation limiter (CSL) of DVC on the transient stability of GFM inverters is analyzed. It is found that the CSL can enhance transient stability, yet it may boost the dc-link voltage or even trigger overvoltage protection, especially when the threshold value of CSL is small. To tackle the adverse impact of CSL on dc-link voltage, a flexible saturation limiter is then proposed, which only begins to limit the active power reference when the derivative of dc-link voltage turns from positive to negative (the dc-link voltage reaches its peak value at this instant). Finally, experimental and simulation tests confirm the effectiveness of the method.
2023Published in IEEE Transactions on Energy Conversion on pages 1-11. 10.1109/TEC.2023.3273723