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Compressed sensing ( Compressed Sensing , cs ) N theory , first proposed the short duration power quality disturbance signal compression sampling method , the method to break through the Nyquist sampling frequency limit below the Nyquist sampling the frequency of the low- rate sampling . Comparative analysis of the CS theory and traditional sampling theory to study the implementation of CS short-time power quality signal compression sampling , including: the construction of the measurement matrix sparse basis selection and power quality signal fast Bayesian reconstruction algorithm matching pursuit ( FBMP )