摘要
全球能源互联网是实现新能源资源在全球范围内合理配置和高效利用的重要发展方向。基于模块化多电平换流器(modular multilevel converter,MMC)的柔性直流输电技术凭借其可以为无源电网提供支撑和控制灵活的特点,正逐渐成为构建全球能源互联网的重要技术手段之一。对柔性直流输电技术在全球能源互联网背景下的应用进行了深入研究。首先梳理了柔性直流输电在全球能源互联网中的3种典型应用场景。接着利用PSCAD/EMTDC仿真研究了传统柔性直流在典型应用场景下的故障特性,分析了其应用于全球能源互联网时的不足。针对这些不足,提出了一种具有解耦运行能力的基于锂电池储能装置的有源型柔性直流输电技术,对其拓扑结构和控制策略进行了介绍。最后在PSCAD中仿真验证了所提出的有源型MMC在全球能源互联网应用场景下隔离交流系统故障对直流侧系统的功率冲击的能力。
Global energy interconnection is an important development direction for the rational allocation and efficient use of renewable energy resources on a global scale.Modular-multilevel-converter-based high voltage direct current(MMC-HVDC)can provide support for passive grids and control flexibility.As a result,it is gradually becoming one of the important technologies for building global energy interconnection.This study focuses on the application of MMC-HVDC in global energy interconnection.First,three typical scenarios for the application of MMC-HVDC in global energy interconnection are obtained.Then,the fault characteristics of conventional MMC-HVDC in these scenarios are studied using PSCAD/EMTDC,and the problems of applying MMC-HVDC to global energy interconnection are analyzed.An active MMC-HVDC based on a battery energy storage system with decoupling operation capability is proposed to solve these problems,and its topology and control strategy are introduced in detail.Finally,the ability of the proposed active MMC to isolate the power impact of an AC system fault on a DC system in the aforementioned scenarios is verified by performing simulations using PSCAD.
作者
刘耀
吴佳玮
肖晋宇
侯金鸣
赵小令
徐雨哲
张哲任
徐政
LIU Yao;WU Jiawei;XIAO Jinyu;HOU Jinming;ZHAO Xiaoling;XU Yuzhe;ZHANG Zheren;XU Zheng(Global Energy Interconnection Group Co.,Ltd.,Xicheng District,Beijing 100031,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China)
出处
《全球能源互联网》
2020年第2期107-116,共10页
Journal of Global Energy Interconnection
基金
全球能源互联网集团有限公司研究项目(构建全球能源互联网的直流电网组网技术及仿真研究,SGGEIGOOJYJS1900011).
关键词
全球能源互联网
模块化多电平换流器
柔性直流
储能装置
解耦运行
global energy interconnection
modular multilevel converter
VSC-HVDC
energy storage
decoupling operation
