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Design-Oriented Analysis of Transient-Stability Impact of DC-Link Voltage Controller on Grid-Forming Inverters
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  • Cheng Luo ,
  • Xiongfei Wang ,
  • Teng Liu ,
  • Xikui Ma
Cheng Luo
Xian Jiaotong University

Corresponding Author:[email protected]

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Xiongfei Wang
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This paper analyzes the parametric effect of the dc-link voltage controller (DVC) on the transient stability of grid-forming (GFM) inverters. It is revealed that the decrease of proportional gain of DVC may introduce the shrinking unstable limit cycle in the phase space according to the bifurcation theory. The unstable limit cycle, which appears between the Hopf bifurcation and Homoclinic bifurcation, may lead to the loss of synchronism for GFM inverters with the grid even if the new equilibrium point is stable after the large disturbance. The parametric effect of the integral gain of DVC is also identified upon bifurcation theory, based on which, a parametric space is proposed for designing DVC to guarantee the transient stability of GFM inverters. The theoretical findings are validated by experimental tests.