基于正弦幅值积分器的新型2倍频锁相技术
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摘要
针对电网电压不平衡及畸变工况下,同步旋转坐标系锁相环(SRF-PLL)方法对同步信息检测精度的影响,基于正弦幅值积分器(SAI)与级联型二阶广义积分器(SOGI),提出了一种新型2倍频锁相方法。在负旋转坐标系下,利用SAI对频率极性选择的特点,对2倍频分量进行了分离与提取,克服了SRF-PLL,在不平衡工况下产生2倍工频波动的缺点;在电网严重畸变的情况下,基于级联型SOGI良好的滤波性能,有效地提取出电网基波分量。介绍了级联型SOGI与SAI两种积分器,并与SRF-PLL方法进行了对比,仿真与实验结果表明,所提方法可行有效。
For the unbalanced and distorted grid faults,the synchronous rotating fram phase locked loop(SRF-PLL)has influenced the detection accuracy of synchronization information.A novel phase locked loop method of double fundamental frequency based on sinusoidal amplitude integrators(SAI) with the cascaded second order generalized integrator(SOGI) is proposed.The method uses the frequency characteristics of SAI under the negative rotation coordinate system,which separates and extracts the double fundamental frequency component from the unbalanced grid,overcoming the shortcomings of the SRF-PLL.In the case of serious distortion of the power grid,the method uses the excellent filter performance of cascaded SOGI,effectively extractes the fundamental component of the power grid.The basic principle of the cascaded SOGI and SAI is introduced,and the results are compared with the SRF-PLL.The effectiveness and feasibility of the method are verified by simulation and experiment.
For the unbalanced and distorted grid faults,the synchronous rotating fram phase locked loop(SRF-PLL)has influenced the detection accuracy of synchronization information.A novel phase locked loop method of double fundamental frequency based on sinusoidal amplitude integrators(SAI) with the cascaded second order generalized integrator(SOGI) is proposed.The method uses the frequency characteristics of SAI under the negative rotation coordinate system,which separates and extracts the double fundamental frequency component from the unbalanced grid,overcoming the shortcomings of the SRF-PLL.In the case of serious distortion of the power grid,the method uses the excellent filter performance of cascaded SOGI,effectively extractes the fundamental component of the power grid.The basic principle of the cascaded SOGI and SAI is introduced,and the results are compared with the SRF-PLL.The effectiveness and feasibility of the method are verified by simulation and experiment.
引文
[1]Rodriguez P,Teodorescu R.Candela I,et al.New PositiveSequence Voltage Detector for Grid Synchronization of Power Converters Under Faulty Grid Conditions[A].Power Electronic Specialists Conference[C].2006:1-7.
[2]闫朝阳,贺红艳,李建霞,等.电网电压不平衡时基于二阶广义积分器SOGI的2倍频电网同步锁相方法[J].电源学报,2014(6):93-100.
[3]杜雄,刘延东,王国宁,等.采用正弦幅值积分器的单同步参考坐标系同步信号检测方法[J].电工技术学报,2015,30(8):167-175.
[2]闫朝阳,贺红艳,李建霞,等.电网电压不平衡时基于二阶广义积分器SOGI的2倍频电网同步锁相方法[J].电源学报,2014(6):93-100.
[3]杜雄,刘延东,王国宁,等.采用正弦幅值积分器的单同步参考坐标系同步信号检测方法[J].电工技术学报,2015,30(8):167-175.