Research on Reduced-order Small-signal Model of Modular Multilevel Converter

被引：0

作者：

Li Z. ^{[1
]}

Hao Q. ^{[1
]}

Yin X. ^{[1
]}

Wang S. ^{[2
]}

机构：

[1] Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University), Jinan, 250061, Shandong Province

[2] Jinan Power Supply Company of State Grid Shandong Electric Power Company, Jinan, 250012, Shandong Province

来源：

Hao, Quanrui (haoquanrui@sdu.edu.cn) | 2018年 / Chinese Society for Electrical Engineering卷 / 38期

基金：

中国国家自然科学基金;

关键词：

Balanced realization theory; Dynamic characteristic; Hankel singular value; Modular multilevel converter (MMC); Reduced-order small-signal model;

D O I：

10.13334/j.0258-8013.pcsee.171236

中图分类号：

学科分类号：

摘要：

To study the small-signal model of modular multilevel converter (MMC), the inner state variables including sub-module capacitor voltage fluctuations, the inner loop current are usually considered. However, this will greatly increase the order of MMC. To decrease the order of the small-signal model of multi-terminal MMC-MTDC, this paper first derived the full-order small signal model of MMC, and then presented the general model-reduction method for MMC based on balanced realization and Hankel singular value theories. With the presented approach, two valid reduced-order small-signal models were derived for rectifier and inverter, respectively. Taking a three-terminal MMC-HVDC grid for example, the dynamic response and the root locus of the systems before and after model reduction were compared and analyzed. The simulation shows that by keeping appropriate order, the reduced-order model of MMC performs consistently with full-order model of MMC; with the proposed model-reduced method, MMC based HVDC grid has the same dynamic response with full-order and reduced-order system models, and the reduced-order model can correctly predict the instability of the system. © 2018 Chin. Soc. for Elec. Eng.

引用

页码：3638 / 3650

页数：12

共 25 条

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