Based on distributed PV(Photo Voltaic) power generation model,the mathematical expressions of distributed PV grid-connected signals are formulated. To analyze theoretical error expressions under harmonic and voltage fluctuation conditions,TDM(Time Division Multiplier) based power metering model is presented.Meanwhile,error correction modules of active power metering based on the harmonic frequency and voltage fluctuation detection are designed,and an improved approach of reactive power metering through Hilb...