摘要
基于传统d q理论的谐波检测方法只能检测出三相对称系统中的谐波分量,但在电力系统故障检测和保护中,往往需要检测出对应于故障的特征次谐波电流。提出了一种改进的d q检测法,它能检测出三相不对称系统的任意次谐波电流。针对实际检测环节中,高次谐波通过加设在检测环节前端的低通滤波器时产生较大的相角误差,给出了一种切实可行的相位误差校正方法。理论分析和仿真结果证明了所提方法的正确性。
Harmonic current detection based on conventional approach using d-q transformation can only detect harmonic components in three-phase balanced system. But in power system fault detection and protection, only characteristic harmonic current corresponding to fault needs can be detected. A new detection algorithm for random harmonic current in three-phase unbalanced system based on d-q transformation is presented. Furthermore, this paper brings forward a feasible phase error revising method to revise the bigger error during higher harmonic passing the LPF, which is installed at the front of the detetcor. Analysis and simulation prove the correctness of the algorithm.
出处
《继电器》
CSCD
北大核心
2004年第24期29-32,共4页
Relay
关键词
D-Q变换
任意次谐波
相位误差
校正
仿真
d-q transformation
random harmonic
phase error
revise
simulation
