电网故障时基于双输入SOGI-FLL的新型电网快速同步方法  

A Novel Fast Grid-Synchronization Method Under Grid Failure Based on Dual-Input SOGI-FLL

作　　者：邓哲[1] 周峰武[2] 林辉品[2] 候尧杰 吕征宇[2] 

机构地区：[1]国网浙江省电力公司电力科学研究院,杭州31014 [2]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2013年第12期32-43,共12页Transactions of China Electrotechnical Society

摘　　要：为了提高电网故障时三相电压不平衡、畸变及频率闪变等异常情况下的网侧变流器与电网的同步速度,本文在传统SOGI-FLL电网同步方法的基础上,首次提出通过增加一个输入端口而构建出全新的双输入二阶广义积分正交信号发生器模块(DISOGI-FLL QSG),该模块大幅提高了SOGI和FLL的收敛速度。同时,结合静止坐标系下的电压微分解耦方法和多模块扩展的方法,可以更加快速、准确地提取网侧正负序基波和各次谐波的幅值、频率与相位等信息。最后通过仿真和实验证实,本文所提的三相电网解耦同步方法收敛速度相比SOGI-FLL提高了一倍以上。In order to improve the grid synchronous speed under abnormal conditions, such as voltage imbalance, distortion, and frequency flicker, a novel grid synchronization method is proposed. Compared with traditional SOGI-FLL grid synchronization, an additional input port is added to the SOGI-FLL to establish a dual input SOGI-FLL quadrature signal generator（DISOGI-FLL QSG）, so that the convergence rate of SOGI and FLL is greatly improved. With combination of the voltage differential decoupling method and multi-module expansion, the positive or negative fundamental and harmonic voltage information of grid is achieved much faster. Simulation and experiments finally confirm that, compared with SOGI-FLL, the proposed fast decoupling synchronization method performs a doubled convergence rate.

关 键 词：三相同步 电网故障 正负序解耦 带锁相环的双输入二阶广义积分器 

分 类 号：TM85[电气工程—高电压与绝缘技术]