| The structure and working principle of induction watt-hour meter and electrical meter has been introduced. The error of electric measurement has been analyzed based on the working principle and measurement on harmonic. The impact of power meter has been analyzed from the following three aspects of the problem which are Power harmonic direction, frequency fluctuations and the promble of many harmonic sourses. The irrationality of measurement model has been pointed. The model of electrical meter and the model of harmonic meter hasve been completed by MATLAB. The harmonic meter can measure the direction and amplitude exactly. The impact of harmonic for power meter has been simulated. The paper provides the power meter model of Hannning windowing, which can solve the problem of frequency fluctuations. It has been proved by simulation. At last, the new measurement model has been provided which using the model of Partial least-squares regression. The new model can distinguish harmonic power which comes from the linear load, nonlinear load and system. The irrational problem of measurement model has been solved.
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