Abstract
This article analyzes the transient stability of grid-following voltage source converters (GFL-VSCs) considering the voltage-dependent current injection (VDCI) dynamics during fault ride-through (FRT). The dynamic interaction between the VDCI and the phase-locked loop (PLL) under the weak grid is revealed to provide insight for their impact on system transient stability. The condition of existence of equilibrium points (EPs) of VSC-grid system during grid faults is first investigated by using a static model considering the VDCI. Then, a dynamic model is developed to characterize the capability of VSC in converging to the EPs during grid faults. It is revealed that the <italic>K</italic>-factor, which determines the characteristic of the VDCI, has a crucial impact on the transient stability of the system. Finally, case studies based on electromagnetic transient (EMT) simulation and experiment are given to validate the theoretical findings.
Originalsprog | Engelsk |
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Tidsskrift | IEEE Transactions on Energy Conversion |
Vol/bind | 37 |
Udgave nummer | 4 |
Sider (fra-til) | 2749-2760 |
Antal sider | 12 |
ISSN | 0885-8969 |
DOI | |
Status | Udgivet - 1 dec. 2022 |