Transient Stability Analysis of Grid-Connected Converter Driven by Imbalance Power under Non-Severe Remote Voltage Sag

Xuli Quan, Xinchun Lin, Yun Zheng and Yong Kang
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Xuli Quan: State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET), School of Electrical and Electronic Engineering (SEEE), Huazhong University of Science and Technology (HUST), Wuhan 430074, China
Xinchun Lin: State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET), School of Electrical and Electronic Engineering (SEEE), Huazhong University of Science and Technology (HUST), Wuhan 430074, China
Yun Zheng: State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET), School of Electrical and Electronic Engineering (SEEE), Huazhong University of Science and Technology (HUST), Wuhan 430074, China
Yong Kang: State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET), School of Electrical and Electronic Engineering (SEEE), Huazhong University of Science and Technology (HUST), Wuhan 430074, China

Energies, 2021, vol. 14, issue 6, 1-17

Abstract: In the transient process of the grid-connected converter (GCC), the existing research mainly focuses on the impact of the control loops. Little attention is paid to the transient stability issues driven by the imbalance between the input power and output power of GCC. This paper shows that the transient stability issues will still exist even if ignoring the dynamics of phase-locked loop (PLL) and current loop. In this paper, the models of the AC grid and the GCC are built under the assumption that the dynamics of the PLL and current loop are ignored. Then, by analyzing the transient process of GCC under non-severe remote voltage sag, the effects of the imbalance power on the transient stability of GCC are discussed. Moreover, for the GCC to operate stably after the transient process, there should be a maximum input power limit (MIPL) for GCC, and the imbalance power equation is applied in this paper to determine the transient stability of GCC. Furthermore, the effects of the current limitation on the transient stability of the GCC are also discussed. Finally, the theoretical analysis has been verified by means of simulations.

Keywords: grid-connected converter; imbalance power; non-severe remote voltage sag; maximum input power limit (MIPL); current limitation; imbalance power equation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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