摘要
目前从控制策略上研究五电平逆变器的研究较少。为此,将非线性的无源控制(PBC)理论应用于五电平逆变器的控制之中,该方法从能量成型的角度考虑控制系统的构造,且需要选取适当的能量函数与注入阻尼。首先根据五电平逆变器的拓扑结构及其开关函数推导出其数学模型;然后选取适当的能量函数与注入阻尼确定无源E-L模型控制器的开关函数,并将推导出的开关函数结合调制算法驱动并网系统。仿真和实验表明,相比于传统的PI控制,无源控制不但提高了系统的动、静态稳定性,还降低了逆变器输出电流谐波,提升了系统的经济性。
At present,the five-level inverter from the control strategy is rarely studied.Therefore,we apply the nonlinear passivity-based control(PBC)theory to the control of five-level inverters.In this method,the structure of control system is considered from the viewpoint of energy forming,and the selection of anappropriate energy function and injection damping is needed.Firstly,a mathematical model is deduced according to the topology of the five-level inverter and its switching function.Then,the mathematical model of the five-level inverter is transformed into the passive Euler-Lagrange(E-L)expression by selecting the appropriate energy function and injection damping,and the switching function is combined with modulation algorithm to drive the grid-connected system.Simulation and hardware experiments show that,compared with the traditional PI control,the passivity-based control not only improves the dynamic and static stability of the system,but also reduces the output current harmonics of the inverter and improves the economy of the system.
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)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2019年第6期1819-1826,共8页
High Voltage Engineering
基金
国家自然科学基金(61573239)
上海市重点科技攻关计划(14110500700)~~
