Research On Modeling And Analysis Method Of Electric Energy Metering Error Based On R46

The accuracy of electrical energy meters measurement is related to the fair and fair settlement of electric energy trade.According to the existing verification regulation of electrical energy meters,only the measurement error of single influence quantity is considered when the electrical energy meter is tested.However,the actual operating conditions are concomitant with multiple influences,and the existing methods can not evaluate the actual measurement performance of the electrical energy meter.Based on this,the R46 international recommendation released by the international legal metrology organization firstly proposes the comprehensive error assessment model for electrical energy meters,which can reflect the metering performance of electrical energy meters under actual working conditions.Based on this assessment model,this paper carried out a series of theoretical and experimental research with the electrical energy meter measurement error test requirements of R46 international recommendation,and built an improved electrical energy meter comprehensive error assessment model,which is more suitable for the working mode.This paper has done following works:1.This paper introduces the measurement principle of watt-hour meter with different structures and types,analyzes the source of measurement error of watt-hour meter,compares the similarities and differences among IEC62052 standard,GB/T17215 standard and R46 international recommendation in the verification experiment and the evaluation method of electrical ene rgy meter measurement error.2.According to the experimental requirements of the peak wave proposed by R46 international recommendation,firstly,the harmonic detection algorithm based on iterative filtering is used to analyze the theoretical energy error of the peak wave,then the experimental analysis is carried out.The influence of inter-harmonic on the measurement error is analyzed according to the experimental requirement of AC current loop harmonic put forward by R46 international recommendation.At the same time,the theoretical and experimental analysis of voltage fluctuation and flicker signal on the measurement error of watt-hour meter is carried out.The influence mechanism of the dynamic changing signal on the measurement error of electrical energy meter is revealed theoretically,and it provides a theoretical basis for the establishment of the comprehensive error evaluation model of electrical energy meters.3.According to the evaluation model of comprehensive maximum allowable error of electrical energy meter proposed by R46 international recommendation,the synthetic error experimental platform based on this evaluation model is set up,and the experiment is carried out.The relationship between the voltage fluctuation and the zero sequence,positive sequence and negative sequence in the three-phase system is analyzed by MATLAB simulation,and the functional relation between the voltage fluctuation and the three-phase load unbalance degree is derived from the relationship between the voltage fluctuation and the three-phase load imbalance.The assesement model of comprehensive errors based on R46 is improved to avoid double counting.4.Firstly,the experimental platform of the improved comprehensive maximum allowable error evaluation model is set up,then the experimental scheme of the basic error,the single influence quantity and the improved comprehensive maximum allowable error evaluation model are designed.A large number of experimental data show that the improved comprehensive error evaluation model can more accurately evaluate the metering performance of electrical energy meter under the consideration of multiple influence quantities.Finally,the standard uncertainty analysis of the basic error experimental data is carried out to verify the accuracy and effectiveness of the improved evaluation model proposed in this paper.