【摘要】 对现有的离散化闪变算法进行研究,发现信号采样起始点对闪变检测结果产生影响,导致分析结果误差较大。分析该算法误差的影响因素,提出对原有离散化方法采样点的限定要求,即采样起始点应为基波过零点。分析有效值检波过程产生的误差,以及非基波过零点作为采样起始点产生的误差,在FPGA+DSP的平台上实现离散化闪变算法。测量结果表明:当采样点从基波过零点开始时,电压闪变检测结果符合IEC要求;当采样起始点与基波过零点有相位差时,闪变值计算误差增大并呈现周期性变化,验证限定要求的有效性。更多还原

【Abstract】 The present discrete algorithm for voltage flicker has been analyzed. The impact of the first signal sampling point on the flicker testing results led to larger detection errors,which was as well confirmed by the results obtained in the experiment. The influencing factors of the algorithm error were analyzed. A definitive requirement on the sampling point of the original discrete method was proposed,i.e.,the first sampling point should be at the zero crossing point of the fundamental wave. This algorithm was realized on a FPGA +DSP platform based on the analysis of the errors produced in RMS detection and generated from the first sampling point namely the non-zero crossing sampling point. The measurement results matched with the IEC standard. The calculation error in flicker value increased and changed periodically when there were phase differences between the first sampling point and the zero crossing point,thus verifying the effectiveness of the definitive requirement.更多还原