Abstract An interconnection of independently designed voltage source converters (VSCs) and their control in high voltage DC grids can result in network-level detrimental interactions and even instability. In many cases, vendors are not willing to share proprietary information about their designs in a manner that allows the entire system to be designed considering the collective dynamics. Besides, such an endeavour is not realistic. In this paper, robust network-level global controllers are proposed to decouple interacting VSCs through an impedance shaping technique. Particularly, the global controllers are designed without any need to establish the internal controller structure of any VSC which is often proprietary. Rather, the global controllers rely on the externally measurable feedback impedance of each VSC in stand-alone and the rest of the system. It is demonstrated how robust convex optimization framework can be exploited to robustly shape global feedback impedances to obtain a decoupled network. The synthesized controllers are validated through nonlinear simulations of the physical model.

中文翻译：

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通过阻抗最小化在 VSC-HVDC 电网中减轻交互作用的稳健分散方法

摘要 独立设计的电压源换流器 (VSC) 的互连及其在高压直流电网中的控制会导致网络级的有害相互作用甚至不稳定。在许多情况下，供应商不愿意以允许在设计整个系统时考虑集体动态的方式共享有关其设计的专有信息。此外，这样的努力是不现实的。在本文中，提出了稳健的网络级全局控制器，通过阻抗整形技术来解耦交互的 VSC。特别是，全局控制器的设计不需要建立任何 VSC 的内部控制器结构，这通常是专有的。相当，全局控制器依赖于独立系统和系统其余部分中每个 VSC 的外部可测量反馈阻抗。展示了如何利用稳健的凸优化框架来稳健地塑造全局反馈阻抗以获得解耦网络。合成控制器通过物理模型的非线性仿真进行验证。