Wideband Impedance Passivation of MMCs for Suppressing Harmonic Oscillations

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery Pub Date : 2024-09-02 DOI:10.1109/TPWRD.2024.3453193

Pengxiang Huang;Heng Wu;Luigi Vanfretti;Oriol Gomis-Bellmunt

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引用次数: 0

Abstract

Harmonic instability and associated oscillation events have become one of the main concerns in MMC-based HVdc systems. These oscillations can appear in the range from a few hundred hertz to several kilohertz, and the root cause is identified as delay-induced negative damping of MMC impedance appearing at the system resonance frequency. This paper introduces a wideband impedance reshaping method through MMC control to eliminate such negative damping for both grid-following (GFL) and grid-forming (GFM) MMCs, which makes the MMC impedance completely passive from the second harmonic frequency upward, thus preventing all harmonic oscillations. First, simplified impedance models of MMCs are derived for the harmonic stability analysis and the impedance reshaping control design. Next, a passivity-based impedance reshaping method is presented, as well as practical considerations for its implementation. In addition, to maintain the MMC's disturbance ride-through capability, an adaptive activation scheme is developed, which enables the wideband impedance reshaping control only in the presence of harmonic oscillation events. The effectiveness of the proposed method is validated by frequency domain analysis and by electromagnetic transient (EMT) simulations of two typical MMC-based power systems.

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用于抑制谐波振荡的 MMC 宽带阻抗钝化技术

谐波不稳定性和相关振荡事件已成为基于 MMC 的高压直流系统的主要问题之一。这些振荡可能出现在几百赫兹到几千赫兹的范围内，其根本原因是在系统谐振频率下出现的 MMC 阻抗延迟引起的负阻尼。本文介绍了一种通过 MMC 控制消除负阻尼的宽带阻抗重塑方法，适用于栅追随（GFL）和栅形成（GFM）MMC，使 MMC 阻抗在二次谐波频率以上完全无源，从而防止所有谐波振荡。首先，为谐波稳定性分析和阻抗重塑控制设计推导出简化的 MMC 阻抗模型。接着，介绍了一种基于被动性的阻抗重塑方法，以及实施该方法的实际考虑因素。此外，为了保持 MMC 的抗干扰能力，还开发了一种自适应激活方案，只有在出现谐波振荡事件时才能进行宽带阻抗重整形控制。通过对两个基于 MMC 的典型电力系统进行频域分析和电磁暂态 (EMT) 模拟，验证了所提方法的有效性。

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 Transactions on Power Delivery 工程技术-工程：电子与电气

CiteScore

9.00

自引率

13.60%

发文量

513

审稿时长

6 months

期刊介绍： The scope of the Society embraces planning, research, development, design, application, construction, installation and operation of apparatus, equipment, structures, materials and systems for the safe, reliable and economic generation, transmission, distribution, conversion, measurement and control of electric energy. It includes the developing of engineering standards, the providing of information and instruction to the public and to legislators, as well as technical scientific, literary, educational and other activities that contribute to the electric power discipline or utilize the techniques or products within this discipline.