向无源网络供电的MMC型直流输电系统建模与控制

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摘要模块化多电平换流器(MMC)是一种适合用于电压源换流器型高压直流输电(VSC- HVDC)的多电平电压源换流器拓扑。本文分析了向无源网络供电的MMC型VSC-HVDC的系统结构和工作原理,给出了MMC型VSC-HVDC通用的换流系统和受端交流系统的数学模型,据此建立了无源逆变的内环电流和外环电压的双闭环控制系统。通过给定无源逆变的同步相位,保证了供电频率的不变性。在PSCAD/EMTDC中搭建了向无源网络供电的MMC型VSC-HVDC仿真系统,对有功和无功负荷增加以及交流电压抬升等三种工况进行了仿真研究。仿真结果表明所设计的控制器可以实现快速精确的电压电流反馈控制,具有良好的稳态精度和暂态响应特性,能够向无源网络提供高质量的电能供应。

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关键词 ：模块化多电平换流器, 电压源换流器型高压直流输电, 无源网络, 矢量控制, 双闭环

Abstract：Modular multilevel converter(MMC) is a multilevel converter suitable for VSC-HVDC transmission. In this paper, the circuit configuration and operation mechanism of MMC based VSC-HVDC transmission system connected to passive networks are introduced. A generalized mathematical model for the MMC based VSC-HVDC system is deduced, and a double closed-loop controller containing an inner fast current loop and an outer voltage loop is proposed for the control of the inverter station. The angular frequency of the synchronous phase angle provided for the dq transformation of the inverter controllers is set at the rated value, and thus a nominal system frequency is ensured at the inverter AC side. The steady-state and dynamic performance of the proposed controllers under different operation conditions are shown by time-domain simulation carried out in PSCAD/EMTDC. Therefore, high-quality power supply of passive networks can be achieved by the proposed MMC-HVDC transmission system.

Key words： Modular multilevel converter(MMC) voltage source converter based high voltage direct current(VSC-HVDC) transmission passive network vector control double closed loop

收稿日期: 2011-02-18 出版日期: 2013-11-28

PACS:

TM721

作者简介: 管敏渊男，1985年生，博士研究生，研究方向为交直流电力系统分析、直流输电和柔性交流输电系统、分布式能源系统并网。徐政男，1962年生，通讯作者，博士，教授，博士生导师，研究方向为大规模交直流电力系统分析、直流输电与柔性交流输电、电力谐波与电能质量、风力发电技术与风电场并网技术。

引用本文:

管敏渊, 徐政. 向无源网络供电的MMC型直流输电系统建模与控制[J]. 电工技术学报, 2013, 28(2): 255-263. Guan Minyuan, Xu Zheng. Modeling and Control of Modular Multilevel Converter Based VSC-HVDC System Connected to Passive Networks. Transactions of China Electrotechnical Society, 2013, 28(2): 255-263.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I2/255

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