Oscillation suppression strategy for modular multi-level converter grid-connected system based on virtual damping in modulation link

IF 2.4 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IET Smart Grid Pub Date : 2023-08-15 DOI:10.1049/stg2.12129

Jialong Li, Junliang Liu, Xiong Du, Ze Wei, Lijuan Fan, Hongxin Li, Zhuo Cheng

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Abstract

Modular multilevel converters (MMC) are widely used in power systems. However, relevant studies and reports show that MMC connected with the grid may cause oscillation problems. When the bridge arm resistance is large enough, the operating conditions will be stable because of overdamping in the system. According to this idea, a virtual damping strategy is proposed, which is equivalent to increasing the resistance of the bridge arm without any actual power loss. Meanwhile, from the perspective of the impedance-based analysis method, it is explained that this virtual damping control strategy can improve the stability margin of the system to realize the suppression of oscillation. In order to verify the effectiveness of the control method, the MMC simulation model is established under Matlab/Simulink. The simulation results show that the proposed virtual damping control can effectively suppress the MMC oscillation problem.

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基于调制环节虚拟阻尼的模块化多级变流器并网系统振荡抑制策略

模块化多电平变换器(MMC)广泛应用于电力系统中。然而，相关研究和报道表明，MMC与电网连接可能会产生振荡问题。当桥臂电阻足够大时，由于系统中存在过阻尼，运行状态稳定。根据这一思想，提出了一种虚拟阻尼策略，即在不造成实际功率损失的情况下，增加桥臂的阻力。同时，从基于阻抗的分析方法的角度解释了这种虚拟阻尼控制策略可以提高系统的稳定裕度，从而实现对振荡的抑制。为了验证控制方法的有效性，在Matlab/Simulink下建立了MMC仿真模型。仿真结果表明，所提出的虚拟阻尼控制能有效抑制MMC的振荡问题。

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

IET Smart Grid Computer Science-Computer Networks and Communications

CiteScore

6.70

自引率

4.30%

发文量

审稿时长

29 weeks