谐波条件下感应式电能表误差校验方法研究  

Research on error verification method for induction energy meter under harmonic conditions

作　　者：孙志强 SUN Zhiqiang(State Grid Corporation of China,Beijing 100031,China)

机构地区：[1]国家电网有限公司,北京100031

出　　处：《电子设计工程》2024年第23期105-108,116,共5页Electronic Design Engineering

摘　　要：在谐波存在的情况下,电流、电压工作磁通会随着谐波频率的增大而减小,驱动力矩也随之减小,使得电能表转速减慢,计量失准。为提升电能计量系统的准确性和可靠性,研究了谐波条件下感应式电能表误差校验方法。通过计算感应式电能表实际电能消耗,可以定量评估谐波对电能表计量误差的影响程度,由此得到谐波误差。结合谐波误差,在Budeanu功率定义的基础上,引入谐波特性系数,构建感应式电能表计量误差的校验模型,并采用基于功能驱动原理的赋权法确定电能表对各次谐波的重要计量特性系数,实现谐波条件下感应式电能表误差校验。实验结果表明,该方法校验后的电能读数实际电能值偏差均在0.02 kW·h以下,并且受温度的影响较小,在稳定性、变差和反应时间三个关键性能指标上均表现最佳。In the presence of harmonics,the working magnetic flux of current and voltage will decrease with the increase of harmonic frequency,and the driving torque will also decrease,causing the speed of the energy meter to slow down and the measurement to be inaccurate.To improve the accuracy and reliability of electric energy metering systems,this paper studies the error verification method of induction type electric energy meters under harmonic conditions.By calculating the actual energy consumption of an induction meter,the impact of harmonics on the measurement error of the meter can be quantitatively evaluated,and thus the harmonic error can be obtained.Based on the Budeanu power definition,a harmonic characteristic coefficient is introduced to construct a calibration model for the measurement error of an induction energy meter,combined with harmonic error.The important measurement characteristic coefficients for each harmonic of the energy meter are determined using a weighting method based on the principle of functional driving,achieving error calibration of induction energy meters under harmonic conditions.The experimental results show that the actual deviation of the verified electrical energy reading by this method is below 0.02 kW·h,and it is less affected by temperature.It performs best in three key performance indicators:stability,variation,and reaction time.

关 键 词：基波电能 感应式电能表 计量误差 频域功率 

分 类 号：TN02[电子电信—物理电子学]