Study On The Influence Of Harmonics On The Measurement Of Watt-hour Meter

Electric energy is one of the most widely used energy sources.It has been widely used in many fields.It calculates the electric energy through the electric energy metering device in every link of power generation,transmission,distribution and consumption.However,due to the access of a large number of power electronic components,the harmonic problem is serious,and the harmonic will also produce electric energy,which will affect the electric energy metering,so the accurate measurement of electric energy is particularly important.This paper analyzes the harmonic problem of power system.First of all,through a large number of reading domestic and foreign literature.Understand the working principle of electronic watt hour meter and the measurement method of electric energy,and on this basis,put forward an improved FFT algorithm to improve the traditional FFT algorithm in the measurement of electric energy spectrum leakage and other problems,and use matlab to carry out comparative simulation experiments,and get the use of this method to suppress the spectrum leakage problem,making harmonic measurement more accurate.Then,this method is used to analyze the influence of the power measured by the linear load and the nonlinear load when there is harmonic in the system.It is concluded that the nonlinear load will produce harmonic component when there is no harmonic in the system,which makes the linear load forced to absorb harmonic;when there is harmonic in the system,both loads are forced to absorb the harmonic of the system.Therefore,the method of adding filter is used to suppress the harmonic of the system.By comparing the method of using hybrid filter,the harmonic analysis and compensation software are used,and the corresponding variable value is obtained by giving the corresponding parameters,so that the harmonic can be suppressed very well.Finally,three transformer substation lines in a city in the north are compensated by this method,and the harmonic content can be reduced Now the accurate measurement of electric energy.