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FFT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61.5μs,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.%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 interface. The practical applications and tests show that the FPGA processor can complete the operation of a frame of the harmonic data ( 1024 point with 16bits) within 61. 5is at the main frequency of 100MHz, which satisfies the requirement of the real - time in the amplitudes - frequency response, and the system effectively solve the contradiction well between "real time" and "accuracy" in the detection of the power harmonics, which has been hard to balance up to now.
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