Transient Frequency Temporal and Spatial Distribution Characteristics of MMC-HVDC Sending-end AC Subsystem for Wind Power Transmission During Symmetric Fault

2023 8th Asia Conference on Power and Electrical Engineering (ACPEE) Pub Date : 2023-04-01 DOI:10.1109/ACPEE56931.2023.10135709

Yanwei Jing, Xiuzhang Wei, Jicong Wu, Hui Zhang, Zimao Yue, Wei Wan

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Abstract

The frequency characteristics of the modular multilevel converter based high voltage direct current (MMC-HVDC) sending-end ac subsystem for wind power transmission are totally different from traditional as system. When there is a fault, transient frequency fluctuation may cause the disintegration of the transmission system. However, the frequency loop control technology is still immature and cannot be used in actual systems at present. Hence, the paper is aimed to explore the transient frequency fluctuation suppression method without altering the traditional U/f dual closed-loop control structure. For the purpose, considering the dynamic processes of both the MMC and the wind turbine, a detailed mathematical model based on the control structure is initially established. And then transient frequency temporal and spatial distribution characteristics are analyzed through simulation based on Matlab/Simulink. Simulation results show that the transient frequency spatial distribution difference is mainly caused by transient current changing ratio, and the dominant factor of the transient frequency temporal characteristics is the PI controller parameters of the MMC.

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对称故障时MMC-HVDC送风端交流分系统暂态频率时空分布特征

基于模块化多电平变换器的风电送电端交流分系统的频率特性与传统的输电系统完全不同。当发生故障时，瞬态频率波动可能引起输电系统的解体。然而，频率环控制技术尚不成熟，目前还不能应用于实际系统中。因此，本文旨在探索在不改变传统U/f双闭环控制结构的情况下抑制暂态频率波动的方法。为此，考虑到MMC和风力机的动态过程，初步建立了基于控制结构的详细数学模型。然后通过Matlab/Simulink仿真分析了暂态频率的时空分布特性。仿真结果表明，暂态频率空间分布差异主要是由暂态电流变化率引起的，而暂态频率时间特性的主导因素是MMC的PI控制器参数。

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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2023 8th Asia Conference on Power and Electrical Engineering (ACPEE)

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