电网畸变下基于改进DSSOGI-FLL同步信号提取方法
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摘要
为了满足在不对称、直流分量及谐波畸变等情况下同步信号的提取需求,三相电压需要准确地提取出电压信号的正负序分量、幅值和基波频率。基于DSOGI-FLL的方法可实现电压在不对称和畸变下同步信号的提取。但当电压跌落深大大、直流分量和多次谐波影响下,DSOGI-FLL方法无法实现同步信号的准确提取,使其追踪的波形波动比较大,并降低了追踪速度。文章对SOGI结构进行改进,使其在SOGI的基础上增加求差节点和自适应滤波器,提出了基于改进DSSOGI-FLL的同步信号提取方法,该方法在电压跌落深度大、直流分量和多次谐波影响下能够准确、快速提取出正负序分量、相位和频率等信息。仿真分析验证了改进方法的准确性和有效性。
In order to meet the requirement of extracting synchronous signals in the condition of asymmetric,DC-offset and harmonics,the positive and negative sequence components,amplitude and fundamental frequency of the voltage signal need to be extracted accurately. The synchronization signal can be extracted under voltage asymmetry and distortion based on DSOGI-FLL. However,when the unbalanced three-phase voltage is large,the DC component and the multiple harmonics are influenced by the DSOGI-FLL method,the accurate extraction of the synchronous signal cannot be realized,and the waveform of the tracking is relatively large and the tracking speed is reduced. In this paper,the structure of SOGI is improved,and the difference node and adaptive filter are added on the basis of SOGI,and the method of synchronous signal extraction based on improved DSSOGI-FLL is proposed. The method can extract the information of positive and negative sequence components,phase and frequency accurately and rapidly under the condition of large drop depth,DC component and multiple harmonics. Simulation analysis verified the accuracy and effectiveness of the improved method.
In order to meet the requirement of extracting synchronous signals in the condition of asymmetric,DC-offset and harmonics,the positive and negative sequence components,amplitude and fundamental frequency of the voltage signal need to be extracted accurately. The synchronization signal can be extracted under voltage asymmetry and distortion based on DSOGI-FLL. However,when the unbalanced three-phase voltage is large,the DC component and the multiple harmonics are influenced by the DSOGI-FLL method,the accurate extraction of the synchronous signal cannot be realized,and the waveform of the tracking is relatively large and the tracking speed is reduced. In this paper,the structure of SOGI is improved,and the difference node and adaptive filter are added on the basis of SOGI,and the method of synchronous signal extraction based on improved DSSOGI-FLL is proposed. The method can extract the information of positive and negative sequence components,phase and frequency accurately and rapidly under the condition of large drop depth,DC component and multiple harmonics. Simulation analysis verified the accuracy and effectiveness of the improved method.
引文
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[2]文武松,张颖超,王璐,等.解耦双同步坐标系下单相锁相环技术[J].电力系统自动化,2016,40(20):114-120.Wen Wusong,Zhang Yingchao,Wang Lu,et al. Single phase phase locked loop under decoupled dual synchronous coordinate system[J].Automation of Electric Power Systems,2016,40(20):114-120.
[3]王科,陈丽华,麦瑞坤,等.基于扩展卡尔曼滤波频率跟踪的DFT同步相量测量算法[J].电网技术,2014,38(9):2519-2524.Wang Ke,Chen Lihua,Mai Ruikun,et al. DFT synchronized phasor measurement algorithm based on extended Calman filter frequency tracking[J]. Power System Technology,2014,38(9):2519-2524.
[4] Sun M,Sahinoglu Z. Extended Kalman filter based grid synchronization in the presence of voltage unbalance for smart grid[C]//Innovative Smart Grid Technologies. IEEE,2011:1-4.
[5] Li B,Wang J,Bao H,et al. Islanding Detection for Microgrid Based on Frequency Tracking Using Extended Kalman Filter Algorithm[J]. Journal of Applied Mathematics,2014,(2014-5-15),2014,2014(6):1-11.
[6] Ghoshal A,John V. Performance evaluation of three phase SRF-PLL and MAF-SRF-PLL[J]. Turkish Journal of Electrical Engineering&Computer Sciences,2015,23(6):1781-1804.
[7]郭宏达.基于二阶广义积分器锁相环的同步信号提取方法研究[D].重庆大学,2013.
[8] Xie M X,Zhu C Y,Yang Y,et al. SRF-PLL With Notch Filter Under Unbalance Three-phase System[J]. Power Electronics,2015.
[9]张功.适于光伏并网LVRT的三相不平衡锁相环研究[D].哈尔滨:哈尔滨工业大学,2013.
[10]Hu Z,Li X,Ai Y. Research on selective harmonic detecting method based DSOGI-PLL[J]. Electronic Measurement Technology,2017.
[11]涂娟,汤宁平.基于改进型DSOGI-PLL的电网电压同步信号检测[J].中国电机工程学报,2016,36(9):2350-2356.Tu Juan,Tang Ningping. Grid voltage synchronization signal detection based on improved DSOGI-PLL[J]. Proceedings of the CSEE,2016,36(9):2350-2356.
[12]Su J,Gao J,Zheng C,et al. Estimation for power quality frequency based on a variable-step ANF algorithm[C]//Industrial Electronics and Applications. IEEE,2015.
[13]杜雄,王莉萍,周雒维.基于自适应陷波器的变频电源频率检测方法[J].电工技术学报,2013,28(4):157-164.Du Xiong,Wang Liping,Zhou Luowei,et al. Frequency detection method of variable frequency power supply based on adaptive notch filter[J]. Transactions of China Electrotechnical Society,2013,28(4):157-164.
[14]Yin G,Guo L,Li X. An Amplitude Adaptive Notch Filter for Grid Signal Processing[J]. IEEE Transactions on Power Electronics,2013,28(6):2638-2641.