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Enhanced Q-axis Voltage Integral Damping Control for Fast PLL-Synchronized Inverters in Weak Grids
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  • Feifan Chen ,
  • Liang Zhao ,
  • Lennart Harnefos ,
  • Xiongfei Wang ,
  • Jarno Kukkola ,
  • Mikko Routimo
Feifan Chen
KTH Royal Institute of Technology

Corresponding Author:[email protected]

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Liang Zhao
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Lennart Harnefos
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Xiongfei Wang
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Jarno Kukkola
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Mikko Routimo
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The phase-locked loop (PLL) is a commonly used synchronization control method for grid-tied inverters. The PLL-synchronized inverters tend to have poor stability robustness with weak grid interconnections, especially when the PLL is designed with a high control bandwidth. To tackle this challenge, this paper proposes an enhanced q-axis voltage integral damping (Q-VID) control, which not only stabilizes PLL-synchronized inverters in weak grids but also lifts the restriction on PLL bandwidth. This superior feature enables inverters to operate stably in ultraweak grids and with a superior transient response. Experimental tests confirm the performance of the method with 400-Hz PLL bandwidth under a short circuit ratio of 1.28 of the grids.
2023Published in IEEE Transactions on Power Electronics on pages 1-10. 10.1109/TPEL.2023.3326098