基于二阶广义积分器的非理想电网同步技术  

Grid Synchronization Technique Based on SOGI Under Non-ideal Grid

作　　者：屈克庆[1] 李文旗[1] 赵晋斌[1] 李芬[1] QU Ke-qing LI Wen-qi ZHAO Jin-bin LI Fen(Shanghai University of Electric Power, Shanghai 200090, Chin)

机构地区：[1]上海电力学院,电气工程学院,上海200090

出　　处：《电力电子技术》2017年第1期72-73,77,共3页Power Electronics

基　　金：上海市自然科学基金(16ZR1413000)~~

摘　　要：在复杂电网情况下,电力电子装置能否正常并网运行,取决于电网电压的同步信号能否被准确获取。非理想条件下,电网电压时常出现的不对称、谐波畸变以及直流分量等问题会影响同步技术所获得同步信号的精度。针对此问题,在传统同步参考坐标系锁相环(SRF-PLL)的基础上,提出一种基于二阶广义积分器(SOGI)的改进型同步方案。该方案通过对传统SOGI结构的改进,使其具备了对包括直流分量在内的各次分量分离的能力。将其应用于传统SRF-PLL,可实现同步坐标系下的直流分量提取,从而消除了电网电压非理想因素对同步信号的影响。实验结果验证了该方法的有效性。The normal parallel operation of power electronic devices needs the accurate and quick detection of the grid synchronization signals.In synchronous signals acquisition process,the problems such as asymmetric grid voltage, harmonic distortion and the DC component will influence the accuracy of the synchronous signal obtained by tradi- tional synchronous reference frame-phase locked Ioop（SRF-PLL）.To solve the problem,an improved scheme based on a second-order generalized integrator（SOGI） is proposed.The scheme improves the structure of the traditional SOGI and make its own the ability to separate each harmonic including DC component.Combining the structure and the tradi- tional SRF-PLL and the synchronization problems caused by asymmetric power grid voltage, harmonic distortion and the DC component can be solved.Experimental results verify the effectiveness of the proposed method.

关 键 词：电网同步技术 二阶厂义积分器 谐波畸变 

分 类 号：V242.3[航空宇航科学与技术—飞行器设计]