基于双输入SOGI-FLL的单相电网电压同步新算法  

NEW ALGORITHM FOR SINGLE-PHASE VOLTAGE SYNCHRONIZATION BASED ON DUAL-INPUT SOGI-FLL

作　　者：邓哲[1] 周峰武[1] 侯尧杰[1] 林辉品[1] 吕征宇[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《太阳能学报》2015年第2期399-407,共9页Acta Energiae Solaris Sinica

摘　　要：研究SOGI-FLL锁相系统受到自身结构制约而无法实现快速响应的原因。提出在其基础上加入一个与原输入差90°相位的新输入端,从而形成双输入SOGI-FLL(dual-input SOGI-FLL,DISOGI-FLL)的锁相结构。通过数学分析和比较,DISOGI-FLL的动态特性相比原系统有了质的提升。针对单相电网和故障情况作相应修改和扩展,进而使其在电网正常或受到谐波干扰时均可快速准确跟踪电网基波和谐波幅值和频率,并产生相应虚拟正交信号,实现电网电压同步。最后,通过仿真和实验验证了所提算法的快速和有效性。SOGI-FLL PLL system cannot achieve a rapid response due to its structural defects. Comparing with SOGI- FLL, a new input which lagged 90 degree phase to the original one, was added. And it was called the dual-input SOGI- FLL （DISOGI-FLL）. Through mathematical analysis and comparison, the dynamic characteristic of the DISOGI-FLL was enhanced dramatically. Some modifications and extensions were made for single-phase grid and fault conditions. Therefore, DISOGI-FLL could track the amplitude and frequency, and produced the corresponding virtual orthogonal signal, even if grid harmonic interference was great. Finally, the proposed algorithm was verified through simulation and experiments.

关 键 词：锁相环 单相电网同步 二阶广义积分器 电网故障 反馈解耦 

分 类 号：TM46[电气工程—电器]