对电压暂降特征量的快速检测是动态电压恢复器(dynamic voltage restorer,DVR)实现电压补偿的前提。介绍了几种典型的电压暂降检测方法,对广泛采用的αβ变换法进行了详细的分析,在此基础上提出了一种新的检测方法,该方法通过锁相、低...对电压暂降特征量的快速检测是动态电压恢复器(dynamic voltage restorer,DVR)实现电压补偿的前提。介绍了几种典型的电压暂降检测方法,对广泛采用的αβ变换法进行了详细的分析,在此基础上提出了一种新的检测方法,该方法通过锁相、低通滤波器等环节可快速推导出基波电压的有效值及相位。较之于传统的αβ变换法,该方法的延时明显减少,因此可以提高DVR的动态性能。仿真结果证实了该方法的有效性。展开更多
The equivalent impedance parameters of loads have been widely used to identify and locate the harmonic sources.However,the existing calculation methods suffer from outliers caused by the zero-crossing of the denominat...The equivalent impedance parameters of loads have been widely used to identify and locate the harmonic sources.However,the existing calculation methods suffer from outliers caused by the zero-crossing of the denominator.These outliers can result in inaccuracy and unreliability of harmonic source location.To address this issue,this paper proposes an innovative method of equivalent impedance parameter calculation of three-phase symmetrical loads that avoid outliers.The correctness and effectiveness of the proposed method are verified by simulations on Simulink using actual monitoring data.The results show that the proposed method is not only simple and easy to implement but also highly accurate.展开更多
文摘对电压暂降特征量的快速检测是动态电压恢复器(dynamic voltage restorer,DVR)实现电压补偿的前提。介绍了几种典型的电压暂降检测方法,对广泛采用的αβ变换法进行了详细的分析,在此基础上提出了一种新的检测方法,该方法通过锁相、低通滤波器等环节可快速推导出基波电压的有效值及相位。较之于传统的αβ变换法,该方法的延时明显减少,因此可以提高DVR的动态性能。仿真结果证实了该方法的有效性。
基金supported by the National Natural Science Foundation of China(No.51777035).
文摘The equivalent impedance parameters of loads have been widely used to identify and locate the harmonic sources.However,the existing calculation methods suffer from outliers caused by the zero-crossing of the denominator.These outliers can result in inaccuracy and unreliability of harmonic source location.To address this issue,this paper proposes an innovative method of equivalent impedance parameter calculation of three-phase symmetrical loads that avoid outliers.The correctness and effectiveness of the proposed method are verified by simulations on Simulink using actual monitoring data.The results show that the proposed method is not only simple and easy to implement but also highly accurate.
