组合式三相逆变器同步控制方法  

Synchronous control method for three-phase combined inverters

作　　者：郑志曜 孙钦斐[1] 王江波[1] 杨仁刚[1] 

机构地区：[1]中国农业大学信息与电气工程学院,北京100083

出　　处：《农业工程学报》2015年第5期146-151,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家高技术研究发展计划"863计划"资助项目(2012AA050217)

摘　　要：为实现组合式三相逆变器输出电压的同步控制,该文以三台单相储能逆变器Y/△连接为例,对其离网模式及离并网预同步过程时的同步控制方法进行研究。该文在离网模式下采用基于CAN(controller area network)总线通信的基准时间同步与相位调整同步的主从同步控制方法;在此基础上,针对离并网预同步过程,该文提出了一种基于改进的二阶广义积分锁相环的频率调整同步控制方法,引入了逻辑判断控制器,实现了三相逆变器电压输出相位差时刻满足120°,保证了离网模式及离并网预同步过程时输出电压的同步,为离并网无冲击切换打下基础。最后,实际试验验证了该方法的可靠性和实用性。The topology of three-phase inverters can divide into a three-phase bridge structure and a single-phase combined structure. Three-phase combined inverters have their own advantages compared to normal three-phase bridge inverters, such as enhanced functionality, more choices for power resources, and simple maintenance, and so on. Therefore, it is worthwhile to study the technology of three-phase combined inverters, especially the study of the synchronous control method for three-phase combined inverters. In this paper, the synchronous control method for three-phase combined inverters was studied in the island operation and the process of pre-synchronization between island and grid-connected operations based on theY/△ connection of three single-phase energy storage inverters. When in the island operation, a synchronous control method of master/slave mode through a time benchmark synchronization and a phase adjustment synchronization was proposed based on a CAN （controller area network） bus communication. With the help of a CAN bus, an automatic network was designed to determine the A, B, and C-phase for the three inverters. A synchronization frame was designed and sent every 20 ms by the A-phase inverter, which was taken as the reference phase and corrected the phase error of the sine signal, to make sure that the time benchmark synchronized and the phase adjustment synchronized .And on this basis, when in the process of pre-synchronization between island and grid-connected operations, a synchronous control method of improved PLL （phase-locked loop） through frequency adjustment synchronization and logic judgment controller was proposed based on a SOGI （second-order generalized integrator）. The improved PLL added a virtual PLL compared to the traditional PLL for the calculation of the real gird voltage phase angle. And the logic judgment controller used the difference between the output voltage phase angle of the inverters and the real gird voltage phase angle as the input, which implemented the smooth

关 键 词：拓扑 电 储能 组合式三相逆变器 同步控制 离网模式 离并网预同步 CAN总线 改进锁相环 

分 类 号：TM464[电气工程—电器]