基于阻抗的三电平变换器平衡和不平衡状态建模，用于双极LVDC电网稳定性分析

2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe) Pub Date : 2020-09-01 DOI:10.23919/EPE20ECCEEurope43536.2020.9215675

T. Roose, G. Van den Broeck, M. Alam, J. Beerten

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引用次数: 0

摘要

本文提出了一种基于阻抗的评估方法来识别电压由三电平DC-DC变换器控制的双极LVDC电网的潜在不稳定性。作为评估的重要步骤，本文对三电平DC-DC变换器的小信号导纳矩阵进行了解析推导，并通过emt型软件PSCAD实现的非线性开关模型进行了验证。结果表明，变换器导纳矩阵在500hz以上的频率下表现出非被动特性。此外，发现非无源性依赖于变流器的工作点。这种行为可能与双极LVDC系统的共振负相互作用，例如lc滤波器共振，导致不稳定的高频振荡和系统不稳定。

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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Impedance-Based Modeling of a Three-level Converter Under Balanced and Unbalanced Condition for the Stability Analysis of Bipolar LVDC Grids

This paper presents an impedance-based assessment to identify potential instabilities in bipolar LVDC grids where the voltage is controlled by a three-level DC-DC converter. As an essential step to perform the assessment, the small-signal admittance matrix of the three-level DC-DC converter is analytically derived and verified by a non-linear switched model implemented in the EMT-type software PSCAD. It is shown that the converter admittance matrix exhibits non-passive behavior at frequencies above 500 Hz. Furthermore, the non-passivity is found to be dependent on the operating point of the converter. This behavior can negatively interact with resonances of bipolar LVDC systems, e.g. LC-filter resonances, leading to unstable high-frequency oscillations and system instability.

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来源期刊

2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)

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