Affiliation:
1. State Grid Sichuan Electric Power Company Electric Power Research Institute, Chengdu 610000, China
2. College of Electrical Engineering, Sichuan University, Chengdu 610000, China
Abstract
Conventional grid-forming control often destabilizes voltage source converters (VSCs) in stiff grids, and transient synchronization instability will occur in the grid fault condition. Therefore, power self-synchronization control (PSSC) is first introduced for enhancing the small-signal stability of grid-forming control in the case of a short circuit ratio ranging from 1 to infinity. Meanwhile, the transient synchronization instability for the grid-forming converter with PSSC in the grid fault condition is analyzed by the phase portrait, and a transient stability enhancement control (TSEC) scheme is combined with a PSSC-based VSC, which can efficiently eliminate the risk of losing synchronization in the arbitrary SCR. Finally, experimental results are provided to confirm the theoretical analysis.
Funder
STATE GRID SICHUAN ELECTRIC POWER COMPANY Science and Technology Project
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