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针对高压直流输电系统，文中提出一种广域分散协调控制架构，其中上层广域协调控制器设计为动态输出反馈形式，对下层的直流附加控制器、PSS和SVC进行协调。为提高所设计控制器在不同运行条件下的鲁棒性，文中引入凸多面体模型，并采用基于阻尼比的判稳条件使得闭环控制系统在不同运行条件下均可运行在强阻尼模式下。仿真算例结果表明所提出的鲁棒控制器在4种不同运行条件下均可以抑制振荡并提高系统阻尼。“,”The present study proposed a wide-area decentralized coordinated control framework among high voltage DC (HVDC) supplementary controller, PSS and SVC. The controller was in the form of dynamic output feedback control, and the coordinated control applicable to various operating conditions was put forward based on polytopic system theory. Simulation results demonstrate that the proposed controller design algorithm is capable of remaining robust and enhancing the system damping over four different conditions.