新型牵引供电系统直流侧二次波动分析与抑制

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摘要为解决传统牵引供电系统中存在的电能质量和过分相问题,介绍了一种基于模块化多电平换流器的多端柔性直流输电系统(MMC-MTDC)的新型牵引供电系统。分析了新型牵引供电系统中出现的直流电压、电流二倍频波动问题,主要有两方面原因:一是受端单相H桥型模块化多电平换流器(SPH-MMC)正常工作时内部环流将流入直流侧引起直流电压、电流二倍频波动;二是送端三相MMC因电网电压不平衡时桥臂中存在的零序电压分量造成直流电压、电流二倍频波动。为此,对于SPH-MMC基于准比例谐振控制器和二阶广义积分器设计环流抑制控制器;对于三相MMC设计无需锁相环和无需电流正、负序分解的电网不对称故障控制器,利用电压补偿技术设计直流侧二倍频波动抑制器。最后,以三端单相-三相MMC-MTDC仿真模型为例验证该文的分析结果和所提出的控制策略。

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	宋平岗
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	董辉

关键词 ：多端直流输电, 牵引供电系统, 模块化多电平换流器, 二倍频波动

Abstract：To solve the problems of power quality and split section that exist in the traditional traction power supply system (TPSS), a novel TPSS that based on the modular multilevel converter multi terminal high voltage direct current (MMC-MTDC) was introduced. The issue of double frequency ripples in the DC voltage/current which appears in the novel TPSS was analyzedand it was caused by two reasons; One reason is the circulating current of single-phase H bridge MMC (SPH-MMC) flow into the DC network. Another is a zero sequence voltage component existing in the bridge voltage of three-phase MMC in unbalanced grid condition. To suppress the double frequency fluctuation, a circulating current suppressing controller based on the quasi proportional resonant (quasi-PR) regulator and the second order generalized integrator (SOGI) filter was design for SPH-MMC; And a controller without PLL and separate positive and negative sequence components of current was proposed for three-phase MMC, besides a DC voltage ripple suppressing control strategy based on the voltage compensation was proposed. Finally, a three terminal single-phase to three-phase MMC-MTDC simulation model was built to support the theoretical analysis and proposed control schemes.

Key words： Multi-terminal direct current(MTDC) traction power supply system modular multilevel converter (MMC) double frequency fluctuations

收稿日期: 2015-07-14 出版日期: 2017-05-12

PACS:

TM46

基金资助:国家自然科学基金项目资助(51367008)

通讯作者: 宋平岗男,1965年生,教授,博士生导师,研究方向为电力电子与新能源技术。E-mail:pgsong@ecjtu.jx.cn

作者简介: 吴继珍男,1991年生,硕士研究生,研究方向为电力电子与电力传动、牵引供电技术。E-mail:943812331@qq.com

引用本文:

宋平岗, 吴继珍, 董辉. 新型牵引供电系统直流侧二次波动分析与抑制[J]. 电工技术学报, 2017, 32(9): 80-91. Song Pinggang, Wu Jizhen, Dong Hui. Analysis and Suppressing DC-Side Twice Ripples of a Novel Traction Power Supply System. Transactions of China Electrotechnical Society, 2017, 32(9): 80-91.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I9/80

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