Abstract
With the high penetration of renewable sources and flexible DC transmission systems, the power electronics converters are playing an important role in the modern power system. However, the grid-connected power converters may suffer from disturbances or cyberattacks from grid faults and communication networks. In this paper, we propose a control framework with multi-timescale constraints for the grid-connected converters. Firstly, the response sequence of different control layers is analyzed for a high power modular multi-level converter (MMC). Then, the operation boundaries of different control layers are derived considering the system stability and the protection requirement. Based on the operation boundaries at various timescales, a current limitation strategy is embedded in the controller to achieve the disturbance/attack resiliency for the grid-connected converter. Finally, simulations of a three-phase 40 MW 21-level MMC connected to a weak grid are performed to verify the resilient operation of the system.
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