Transient Fluctuation Suppression Strategy for MMC Flexible DC Systems Based on Gain-Varying Extended Disturbance Observer

IF 3.4 3区计算机科学 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Access Pub Date : 2024-10-07 DOI:10.1109/ACCESS.2024.3474696

Huanruo Qi;Yilong Kang;Xiaojv Lv;Ziwen Liu;Xiangyang Yan;Fang Guo

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引用次数: 0

Abstract

Modular Multilevel Converter Based High Voltage Direct Current (MMC-HVDC) system is an important technical means to realize grid connection and transmission of new energy. When the external disturbance occurs in the MMC-HVDC system, the submodule capacitance voltages suffer instant impact due to the mutual coupling in the MMC, which causes transient fluctuation and unstable operation of the system. In order to suppress the impact of external disturbance on the internal submodule capacitance voltage transient fluctuations of MMC-HVDC system, the transient fluctuation suppression strategy based on gain-varying extended disturbance observer is proposed in this paper. Firstly, the transient response characteristic equation of the submodule capacitor voltage fluctuation component for MMC-HVDC system is constructed, which reveals the relation between the external output and internal dynamic response of the system. Next, a gain-varying extended disturbance observer is proposed to effectively observe the time-varying disturbance current components in the system, and the corresponding submodule capacitor voltage transient fluctuation suppression strategy is then proposed to improve the dynamic response performance and anti-interference ability of the MMC-HVDC system under different disturbances. The simulation model of MMC-HVDC system is built on PSCAD/EMTDC platform, and the validity and correctness of the proposed method are verified by several simulation tests.

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基于增益变化扩展扰动观测器的 MMC 柔性直流系统瞬态波动抑制策略

基于模块化多电平变换器的高压直流（MMC-HVDC）系统是实现新能源并网和传输的重要技术手段。当 MMC-HVDC 系统中出现外部扰动时，由于 MMC 中的相互耦合作用，子模块电容电压会受到瞬间冲击，从而引起系统的瞬态波动和不稳定运行。为了抑制外部扰动对 MMC-HVDC 系统内部子模块电容电压暂态波动的影响，本文提出了基于增益变化扩展扰动观测器的暂态波动抑制策略。首先，构建了 MMC-HVDC 系统子模块电容电压波动分量的瞬态响应特性方程，揭示了系统外部输出与内部动态响应之间的关系。接着，提出了增益变化的扩展扰动观测器来有效观测系统中的时变扰动电流分量，并提出了相应的子模块电容电压暂态波动抑制策略，以提高 MMC-HVDC 系统在不同扰动下的动态响应性能和抗干扰能力。在 PSCAD/EMTDC 平台上建立了 MMC-HVDC 系统的仿真模型，并通过多次仿真测试验证了所提方法的有效性和正确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Access COMPUTER SCIENCE, INFORMATION SYSTEMSENGIN-ENGINEERING, ELECTRICAL & ELECTRONIC

CiteScore

9.80

自引率

7.70%

发文量

6673

审稿时长

6 weeks

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