摘要
针对传统双Z源二极管箝位(NPC)型五电平逆变器的Z源网络电感启动电流过大、升压能力有限等问题,提出一种新型的双准Z源NPC型五电平逆变器拓扑结构。用一种新型的双准Z源结构代替传统的双Z源结构,能够降低近2/3的Z源网络电感启动电流,提升逆变器直流侧电压接近2倍。将滑模控制应用到准Z源五电平逆变器系统的控制中,该方法无需线性化处理,只需通过系统数学模型就可推导出适当的控制规律。分析新型双准Z源五电平逆变器拓扑的工作原理;应用状态空间法和小信号模型对准Z源五电平并网系统进行数学模型推导和分析,并进行滑模控制器的设计;仿真和硬件实验结果表明,与传统比例-积分(PI)控制相比,滑模控制能够显著提高系统稳定性,降低电流谐波。
A new topology of the five-level NPC dual quasi-Z-source inverter is proposed to overcome the problems of the traditional five-level NPC( Neutral-Point-Clamped) dual Z-source inverter,such as excessive starting current of Z-source inductors and limited boosting ability.In comparison with the traditional topology,the new topology can effectively reduce the start current of the inductor of Z-source network by nearly two thirds,and double improve the DC-side voltage of the inverter.The proposed sliding mode control is applied to the control of quasi-Z-source fivelevel inverter system,in which the linearization can be avoided and only appropriate control law is required to be derived based on the mathematical model of the system.Firstly,the working principle of this new five-level NPC dual quasi-Z-source inverter topology is analyzed.Subsequently,the state space method and small signal model are applied to the Z-source five-level grid-connected system for mathematical model derivation and analysis.Meanwhile,the sliding mode controller is designed.Finally,the simulative and hardware experimental results show that the sliding mode control significantly improves the stability of the system and reduces the current harmonics compared with traditional PI( Proportional-Integral) control.
作者
李涛
程启明
程尹曼
孙伟莎
陈路
LI Tao;CHENG Qiming;CHENG Yinman;SUN Weisha;CHEN Lu(College of Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China;College of Electronics and Information Engineering,Tongji University,Shanghai 201804,China;North Power Supply Branch,Shanghai Electric Power Company,Shanghai 200041,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2019年第1期19-26,共8页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(61573239)
上海市重点科技攻关计划(14110500700)~~
关键词
新型双准Z源拓扑
五电平逆变器
启动电流
升压能力
滑模控制
new dual quasi-Z-source topology
five-level inverter
start current
boosting ability
sliding mode control
