基于CORDIC算法的谐波实时谱分析仪的FPGA设计与实现.pdfVIP

学兔兔 总第48卷 第547期 电测与仪表 VO1．48 N0．547 2011年 第07期 ElectricaI Measurement Instrumentation Ju1．2011 基于CORDIC算法的谐波实时谱分析仪的FPGA设 计与实现 爿： 韦炯全，龚仁喜，孙丹，舒鹏飞 (广西大学电气工程学院，南宁530004) 摘要：谐波污染对电力系统造成很大的危害，及时准确地检测出谐波成分、幅值和相位等因素是治理和消除谐 波污染的前提。本文论述了一种利用CORDIC算法在FPGA上实现谐波实时谱分析仪的方法。基于FPGA硬 件逻辑实现了具有高速数据处理能力的F丌运算处理器，采用CORDIC算法实现了复乘运算和求模运算，与使 用乘法器相比降低了系统的资源占用率，提高了系统速度，同时通过USB接口实现了与主机的高速稳定数据通 信。实际测试表明，主频时钟为100MHz时，FPGA主处理器完成每帧1024点16位数据的FFT运算处理仅需 要61．5 S，实现了频谱幅值实时准确输出，有效的解决了电力谐波检测中难以权衡的实时性与精确度的矛盾。 关键词：谐波；FPGA；FFT；CORDIC 中图分类号：TM933 文献标识码：B 文章编号：1001～1390(2011)07—0037—05 Design and Implementation of a CORDIC——based Real——time Harmonic Spectrum Analyzer in FPGA WEI Jiong—quan，GONG Ren—xi，SUN Dan，SHU Peng—flei (College of Electrical Engineering，Guangxi University，Nanning 530004，China．) Abstract：Harmonic pollution is very harmful to power system．It is the precondition of the disposal and elimination of the harmonic pollution to detect harmonic components，amplitudes and phases accurately and timely．A description of the method for the implementation of a CORDIC—based real—time harmonic spectrum analyzer in FPGA is made，in which the implementation of an FFT arithmetic processor with the ability of high speed data processing based on FPGA， and the complex multiplication and magnitude determination on the basis of CORDIC algorithm are made．Compared to its counterparts employing multipliers，the resource consumption is reduced and the speed of the system is enhanced． And also the implementation of the high speed and stable data communication with the main computer is performed by USB int