PLL Synchronization Stability Analysis of MMC-Connected Wind Farms Under High-Impedance AC Faults
- 22 September 2020
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Systems
- Vol. 36 (3), 2251-2261
- https://doi.org/10.1109/tpwrs.2020.3025917
Abstract
This article analyzes the transient stability of an offshore wind farm connected via modular multilevel converter (MMC)-based high-voltage direct-current transmission system. The wind farm is composed by full-scale type-4 wind turbines, whereas short-circuit faults occurring in between the MMC and wind farm are considered. The MMC tends to be switched to the current limiting mode or the overmodulation mode during the ac-side fault, which further interacts with the control systems of wind turbines, complicating the transient stability problem of the system. Hence, in this work the parametric impacts of the phase-locked loop of wind turbine converters and over-current/-modulation limiters of the MMC are revealed analytically, and further corroborated by time-domain simulations.Keywords
Funding Information
- State Grid Corporation of China
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