基于广义扩展状态观测器的VSC-HVDC频率控制器

2023 International Conference on Power Energy Systems and Applications (ICoPESA) Pub Date : 2023-02-24 DOI:10.1109/ICoPESA56898.2023.10140970

N. Yi, Weiyu Wang, Yijia Cao

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引用次数: 0

摘要

电力系统中电子器件的高度渗透降低了电网的等效惯性，这对电力系统的频率稳定性提出了重大挑战。针对基于电压源变换器(VSC)的高压直流系统(HVDC)，提出了一种基于广义扩展状态观测器的频率控制器(GESOFC)，为低惯量电网提供频率支持。将逆变站与相邻的交流电网视为综合控制装置，将负荷变化或发电机停运引起的缺电视为控制装置的外部扰动。定义了扩展状态来表示交流电网的缺电状态，设计了广义扩展状态观测器(GESO)来估计控制对象的缺电状态和系统状态变量，并利用该观测器构建基于线性二次型调节器(LQR)的反馈控制，实现最优频率调节。通过MATLAB验证了GESOFC算法的有效性。

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A Generalized Extended State Observer-Based Frequency Controller of VSC-HVDC Systems

High penetration of electronics in power systems reduce the equivalent grid inertia, which poses a significant challenge on the frequency stability of power systems. In this paper, a generalized extended state observer-based frequency controller (GESOFC) is proposed for voltage source converter (VSC) based high voltage direct current systems (HVDC) to provide frequency support to low-inertia grids. The inverter station and the adjacent ac grid are considered to be the integrated control plant, and the power deficiency caused by load change or outage of generators is treated as an external disturbance to the control plant. An extended state is defined to represent the power deficiency of the ac grid, and a generalized extended state observer (GESO) is designed to estimate the power deficiency and the system state variables of the control plant, which can be further leveraged to formulate the linear quadratic regulator (LQR) based feedback control for achieving the optimal frequency regulation. The effectiveness of the proposed GESOFC is validated by MATLAB.

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2023 International Conference on Power Energy Systems and Applications (ICoPESA)

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