优化型DDSRF-PLL在不平衡和畸变电网电压下的仿真研究  

Simulation studies of optimized DDSRF-PLL under unbalanced and distorted grid voltage

作　　者：高文森 樊艳芳[1] 王一波[2] Gao Wensen Fan Yanfang Wang Yibo(College of Electrical Engineering, Xinjiang University, Urumqi 830047, China Institute of Electronic Engineering, Chinese Academy of Science, Beijing 100190, China)

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830047 [2]中国科学院电工研究所,北京100190

出　　处：《可再生能源》2017年第5期714-720,共7页Renewable Energy Resources

基　　金：新疆维吾尔自治区自然科学基金项目(2016D01C034)

摘　　要：电网电压混入多次谐波时,DDSRF-SPLL的锁相效果不理想,输出的频率信号存在较大的波动和畸变。文章在DDSRF-SPLL基础之上,提出一种优化的锁相环结构,该锁相环在正负序电压解耦之前先经过SOGI-QSG滤除电网电压中的多次谐波,进而消除其对锁相环的影响,快速精准地对电网电压进行跟踪。在Matlab/Simulink中进行仿真分析,结果表明:文章所提出的锁相环在电网电压不平衡和混入多次谐波时,均能有效地锁定基波电压的频率与相位。Single synchronous reference frame for phase locked loop （SSRF-SPLL） only applied to the lock-phase of grid voltage in ideal conditions,and decouple double synchronous reference frame PLL （DDSRF-PLL） could realize the lock-phase of three-phase unbalanced grid.The frequency signal extracted through DDSRF-PLL still existed larger fluctuations and distortions when there were multiple harmonics in grid voltage,which made phase locked effect non-ideal.By introducing the SOGI-QSG module to filter,this paper proposes an optimized phase locked loop based on DDSRF SPLL.It can eliminate the impact on the phase locked loop and track the grid voltage quickly and accurately when the multiple harmonic in grid voltage are eliminated through SOGI-QSG before decoupling the positive and negative sequence voltage.Simulation and analysis is carried out in Matlab/Simulink,which shows that the frequency and phase of fundamental voltage can be locked effectively when the grid voltage is unbalanced and mixed with multiple harmonics.

关 键 词：三相不对称 多次谐波 锁相环 双同步坐标系 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程]