摘要
针对三相四线制APF谐波检测中低通滤波器影响检测精度和补偿效果的问题,分析了数字低通滤波器的类型、阶数、截止频率,采样频率对APF谐波检测效果的影响,选定二阶巴特沃思数字低通滤波器。提出将FPGA用于处理谐波检测,通过改进瞬时无功功率理论的I p-Iq谐波检测方法和合适的低通滤波器配置,解决电网负载不平衡问题。仿真结果表明:采用此方法,时延仅为200ns,对基波没有影响。
The harmonic detection of active power filter in the low-pass filter design directly affects the detection accuracy of the system and the compensation effect. The digital low-pass filter type, order, cut-off frequency, sampling frequency in the active power filter harmonic detection are analyzed. The second-order Butterworth digital low-pass filter is selected. FPGA is used to process the harmonic detection, by using the Ip -I detection method in reactive power theory and suitable configuration of low-pass filter, the unbalance of loads in power network is solved. The simulation indicates that the delay of this method is only 200 ns, which has no influence on fundamental wave.
出处
《辽宁科技大学学报》
CAS
2013年第4期375-380,共6页
Journal of University of Science and Technology Liaoning
