二阶广义积分器在并网逆变系统中的应用  

Application of Second Order Generalized Integrators in the Inverter System

作　　者：朱玉琼[1] 朱方田[1] 徐立华[1] 左兰[1] 

机构地区：[1]中国矿业大学信息与电气工程学院

出　　处：《变频器世界》2011年第12期48-51,共4页The World of Inverters

摘　　要：普通的积分器是一阶的积分器,是基于有效值的调控,加反馈信号之后,可以实现对直流信号的稳态无静差跟踪,但是无法实现对交流信号的无静差跟踪。使用PR调节器理论上可以实现对交流信号的无静差跟踪,但是当出现电网频率漂移时,漂移点的增益会大幅度减小,跟踪的误差增大。本文介绍了一种新型的控制策略,对PR调节器进行改进,以离散后的二阶广义积分器(second order generalized integrators)为基础模块,加入频率跟踪环节,并应用在单相光伏并网逆变系统中,具有良好的调节性能和电流动态跟随效果,满足并网的要求。Common integrator, which is based on the regulation of root mean square, is a first-order integrator. After adding the feedback signal, it can track direct-current signal with- out the steady-state error. However, alternation current signals cannot be tracked without static error. By using the proportional resonant controller, communication signals can be achieved for static error free tracking in theory, but when the grid frequency drift, the gain of the point will greatly reduce, and System error will increase. This paper presents a new con- trol strategy, it means improving the traditional proportional resonant controller by using the discretized Second order generalized integrator as the basic module, adding the frequency tracking link, then used in single-phase PV grid system. Simulation results show that it have a good effect and adjust the current to follow the performance of dynamic, meet the requirements of connecting to the network.

关 键 词：二阶广义积分器 无静差 逆变 频率跟踪 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]