The Inrush Current Characteristics and Control Strategies of Hybrid- Modular Multilevel Converter Systems During Start-Up Processes

被引：0
|
作者：
Luo Y. [1 ]
Pu Y. [1 ]
Song Y. [1 ]
Yi L. [2 ]
机构：
[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing
[2] State Grid Chongqing Electric Power Company, Chongqing
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2020年 / 35卷
关键词：
Hybrid modular multilevel converter; Inrush current; Over modulation; Start-up control strategy;
D O I：
10.19595/j.cnki.1000-6753.tces.L80464
中图分类号：
学科分类号：
摘要：
Start-up control is the basic conditions of modular multilevel converter (MMC) system operation. However, the capacitor voltages of hybrid-MMC, which consists of full-bridge sub-modules and half-bridge sub-modules, are relatively low and unbalanced after precharge, resulting in inrush current and over modulation. The precharge voltage characteristics of hybrid-MMC and the equivalent circuit are analyzed, based on the converter topology. A method to calculate the precharge voltage of two kinds of sub-modules, respectively, is presented. Then, based on the capability of producing negative level of full-bridge sub-modules, an ac-side start-up control strategy is proposed in this paper, to suppress the inrush current and over modulation. The theory analysis and the proposed strategy are demonstrated by the PSCAD/EMTDC simulation. © 2019, Electrical Technology Press Co. Ltd. All right reserved.
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页码：49 / 59
页数：10
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