一种适用于三相电压不对称情况下的改进i_d—i_q谐波检测算法  

An improved i_d—i_q harmonic current detection algorithm for three-phase voltage asymmetry

作　　者：周炤贤 陈永刚[1] 

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070

出　　处：《工矿自动化》2016年第8期69-73,共5页Journal Of Mine Automation

摘　　要：由于传统i_d—i_q谐波检测法在电网电压不对称与畸变时锁相环测得相角与电网基波正序电压存在相位差,同时,在传统i_d—i_q谐波检测法中使用的低通滤波器性能会影响算法准确性与实时性,提出了一种改进的i_d—i_q谐波检测算法,即利用对称性较好的基波正序电流代替电网瞬时电压进行锁相,从而消除测得电网相角的相位差,并利用平均值理论实现低通滤波器功能,在降低算法延时的同时提高了算法的实时性和检测精度。Matlab/Simulink仿真结果证实了算法的正确性。Due to phase angle measured by phase locked loop has phase difference with grid positive sequence fundamental voltage of traditional i_d—i_qharmonic detection method in grid voltage asymmetry anddistortion phase,at the same time,low pass filter performance used in traditional i_d—i_qharmonic detection method will influence accuracy and real-time performance,an improved i_d—i_qharmonic detection algorithm was proposed,namely using of fundamental positive sequence current with good symmetry to instead of instantaneous voltage to lock phase,so as to eliminate measured phase difference of phase angle of power grid,and using of average value theory to replace function of the low pass filter,in order to reduce time delay and improve real-time performance and detection accuracy of the algorithm.The Matlab/Simulink simulation result proves that the algorithm is correctness.

关 键 词：瞬时无功功率理论 谐波检测 锁相环 相位差 无功补偿 坐标变换 

分 类 号：TD611[矿业工程—矿山机电]