摘要
电网三相不平衡是城市电网中的常见问题。基于模块化多电平换流器的统一潮流控制器(MMC-UPFC)是智能电网主动控制的重要工具。首先提出了一种MMC-UPFC的基于无源性滑模非线性控制策略。该策略首先基于无源性理论,利用阻尼注入方法,建立了基于MMC欧拉–拉格朗日模型的UPFC正、负序无源控制器,并将滑模变结构控制与无源控制相结合,解决了无源控制对系统参数精度要求高的问题,赋予整个系统响应速度快、对参数与外部变化不敏感的特点。其次利用MMC-UPFC串联侧换流器,补偿线路负序电压分量,进行电网三相不平衡治理。最后结合实际工程实例,构建了27电平MMC-UPFC仿真系统,详细验证了所提出的MMC-UPFC控制策略及其对电网三相不平衡治理的有效性。
Three-phase unbalanced voltage condition is a common scenario in urban power grid. Modular multilevel converter based unified power flow controller(MMC-UPFC) plays an important role in smart grid active control. A passive sliding-mode control strategy of MMC-UPFC is proposed in this paper. Firstly, both positive-and negative-sequence passive controllers based on Euler-Lagrange(EL) model of MMC are established with a damping injection method according to the passive control theory. Since precise model parameters are required for a passive controller, sliding mode variable structure control is proposed. The control system has fast response and is not sensitive to parameter variation. The series converter of MMC-UPFC treats unbalanced grid voltage condition by compensating the negative sequence grid voltage. Finally, a simulation model of 27-level MMC-UPFC based on real project is constructed. The validity of proposed MMC-UPFC control strategy and its treatment of unbalanced grid voltage condition are verified by simulation results.
作者
柯顺超
朱淼
陈阳
郑常宝
胡存刚
KE Shunchao;ZHU Miao;CHEN Yang;ZHENG Changbao;HU Cungang(Power Quality Engineering Research Center,Ministry of Education,Anhui University,Hefei 230000,China;School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第3期1078-1086,共9页
High Voltage Engineering
基金
安徽大学教育部电能质量工程研究中心开放课题(2018MD08).
关键词
三相不平衡治理
模块化多电平换流器
统一潮流控制器
无源控制
滑模变结构控制
three-phase unbalance treatment
modular multilevel converter
unified power flow controller
passive control
sliding-mode variable structure control