This paper presents the accurate modeling of HVdc links for the dynamic studies of automatic generation control/load frequency control (AGC/LFC) of the multiarea interconnected power system. In earlier AGC studies, HVdc links were simply modeled by using the first-order transfer function with system time constant ${T_{{\rm{dc}}}}$. It was argued that ${T_{{\rm{dc}}}}$ is the time required by HVdc links to establish dc current after following a load disturbance in the power system. However, no mathematical or analytical justification was provided in support to the existing transfer function model of HVdc links. This paper presents the accurate modeling of HVdc links for AGC studies. The comparative analysis has also been performed to demonstrate error being accrued due to the use of the conventional model of HVdc links. Furthermore, this paper also implements the inertia emulation based control strategy in AGC, which allows us to harness the stored energy from the capacitance of HVdc links for AGC operations.

中文翻译：

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HVDC 联络线的建模及其在多区域电力系统的 AGC/LFC 运行中的应用

本文介绍了 HVdc 链路的精确建模，用于多区域互连电力系统的自动发电控制/负载频率控制 (AGC/LFC) 的动态研究。在早期的 AGC 研究中，HVdc 链路通过使用具有系统时间常数的一阶传递函数简单地建模 ${T_{{\rm{dc}}}}$. 有人认为 ${T_{{\rm{dc}}}}$是 HVdc 链路在电力系统中出现负载扰动后建立直流电流所需的时间。然而，没有提供数学或分析理由来支持 HVdc 链路的现有传递函数模型。本文介绍了用于 AGC 研究的 HVdc 链路的准确建模。还进行了比较分析，以证明由于使用传统的高压直流链路模型而产生的误差。此外，本文还在 AGC 中实现了基于惯性仿真的控制策略，这使我们能够利用来自 HVdc 链路电容的存储能量进行 AGC 操作。