Research on Measuring Electric Energy Method for Energy Measurement Instruments under Frequency Fluctuation
A large number of nonlinear loads are connected to the power grid,resulting in a large number of har-monic injection problems in the power grid,and then the frequency fluctuation of the power grid,which will lead to the error of the traditional energy meter measurement of electric energy.In this paper,a new power measurement al-gorithm is proposed,which adopts CIC filter.CIC filter can be cascaded through DC CIC filter,fundamental CIC fil-ter and higher harmonic CIC filter.That is,the harmonic voltage and harmonic current can be divided into DC com-ponent,fundamental component and higher harmonic component after passing through the cascaded CIC filter.Thus,the electric energy generated by DC component,fundamental wave component and higher harmonic component can be calculated respectively,and then the energy consumed can be obtained.In order to verify the feasibility of the al-gorithm,Matlab software is used for simulation.The simulation results show that the accuracy of electric energy measured by this method is high when the frequency changes abruptly,slowly and linearly.
energy measurement instrumentfrequency fluctuationCIC filter
万方数据
维普
