CMMC 直流故障穿越机理及改进拓扑方案.pdfVIP

第 33 卷 第 21 期 中 国 电 机 工 程 学 报 Vol.33 No.21 Jul.25, 2013 2013 年 7 月 25 日 Proceedings of the CSEE ©2013 Chin.Soc.for Elec.Eng. 63 文章编号：0258-8013 (2013) 21-0063-08 中图分类号：TM 72 文献标志码：A 学科分类号：470·40 C-MMC 直流故障穿越机理及改进拓扑方案 薛英林，徐政 (浙江大学电气工程学院，浙江省 杭州市 310027) DC Fault Ride-through Mechanism and Improved Topology Scheme of C-MMC XUE Yinglin, XU Zheng (College of Electric Engineering, Zhejiang University, Hangzhou 310027, Zhejiang Province, China) ABSTRACT: To achieve fast clearance of the DC link faults, 值。PSCAD/EMTDC 仿真结果验证了所提出的改进拓扑结 the modular multilevel converter (MMC) using recently 构方案的可行性和有效性。 developed clamp double sub-module (CDSM) is one of ideal 关键词：模块化多电平换流器；箝位双子模块；阻尼电阻； options for the MMC based high voltage direct current 直流故障；故障穿越 (MMC-HVDC) system. Firstly, normal and block operation 0 引言 modes of the CDSM are investigated in this paper. Secondly, the fault equivalent circuit and the characteristic of the fault 基于电压源变换的直流输电(voltage source current are analyzed. Owing to the voltage clamping converter based HVDC，VSC-HVDC)是一种以电压 functionality of diodes and the reverse-polarity voltage 源换流器为核心的先进输配电技术，采用全控型电 provided by the module capacitors, the dc fault blocking 力电子器件，具有不存在换相失败、有功无功功率 capability is achieved. Thirdly, two improved topology schemes are proposed, including 1) each arm adopts both 的快速解耦控制、输出电压电流谐波含量低等优 half-bridge sub-modules (HBSMs) and CDSMs, incorporating 势，在清洁新能源并网、城市输