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Voltage fluctuation and flicker meter design based on FPGA and ARM9

Zhang Keming(Shanxi Business Vocational College,Xi'an 710119,China)  
The handheld voltage fluctuation and flicker meter based on ARM9 and FPGA is introduced.The meter can measure 4 channels AC voltage signals at the same time,and the short term severity Pst and long term severity Plt can be calculated.In order to simplify the operation process,the root-mean-square value of each half wave is calculated and a series of RMS value is got.The instantaneous flicker value of each corresponding frequency can be got by the FFT operation to the RMS sequences,and the short term severity Pst is calculated by the method of max probability value.Through the two group of memory in the FPGA alternately receiving data,the 32-bits FFT algorithm using the ping-pong mode is realized,and the operation speed and accuracy can be greatly increased.The experiment indicate that the measurement accuracy of RMS value is up to 2‰,and the measurement accuracy of flicker value is up to 2%.
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