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.

中文翻译：

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弹性功率转换器：通过多时标电流限制方案具有干扰/攻击弹性的并网转换器

随着可再生能源和灵活的直流输电系统的高度普及，电力电子转换器在现代电力系统中扮演着重要的角色。但是，并网电源转换器可能会受到电网故障和通信网络的干扰或网络攻击。在本文中，我们为并网转换器提出了具有多时标约束的控制框架。首先，针对高功率模块化多电平转换器（MMC），分析了不同控制层的响应序列。然后，考虑系统的稳定性和保护要求，得出不同控制层的工作边界。根据不同时间范围的操作边界，控制器中嵌入了电流限制策略，以实现并网转换器的抗干扰/攻击弹性。最后，对连接到弱电网的三相40 MW 21级MMC进行仿真，以验证系统的弹性运行。