Development Of A High-Speed Power Harmonic Detector Based On FPGA+ARM Platform

With the more and more extensive applications of power electronics equipments, the effect of power harmonics on the power system has become more and more great, and the power harmonics has become the social effects of pollution of power system. In order to reduce and eliminate their harm to power system, harmonics must be detected accurately. For this reason, it is of great realistic significance to develop a high-speed and high-precision harmonic detector.In the thesis, the discussion of the principle of harmonic detection and the analysis of the disfigurement of the techniques available are made. A new hardware architecture of the real-time detection of power harmonics is presented, in which the ability of FPGA to process data with high speed is combined with the ability of ARM to expand digital functions with high efficiency. A development of the experimental prototype of the harmonic detector based on the architecture is performed. A detailed description of the development of the hardware and software of the prototype is carried on. The designs of the signal processing circuit, signal sampling and converting circuit, FPGA coprocessor and ARM processor circuit are included in the hardware design of system with the emphasis on that of the logic architectures of the A/D sampling control unit, windowing unit, FFT algorithm implementation unit and operation unit of the square of the magnitude in FPGA by using the techniques of multiplexing logic and pipeline. The design of the bootloader routine and the uClinux programming for ARM processor are mainly included in the software design of system.In order to the verify the correct of the design, the detailed description of the method of the simulation, debugging and test of the individual functional module is made, and the test data and charts are given. The test results show that each module in the system and the whole experimental prototype run well, and that the FPGA coprocessor can complete the operation of a frame of the harmonic data within 38us, and then transport the results to the ARM processor, finally the results are sent to PC via internet by the ARM processor.