电能计量常见误差的问题分析与计算方法

主要分析电能计量中,因测量仪表本身的误差以及人为引起的故障造成电能的错记、漏记、直接影响测量过程中给供电方、用户来带经济损失,因此,在电能计量过程中正确的分析为人故障的电能追补计算很重要。

Studies of surface plasmon resonance sensor using bi-beam differential measurement approach

In this paper, a low-cost measurement approach with bi-beam was presented, which can be used for real-time detection and online analysis of solution refractive index, based on systematical analysis and experiments of conventional detection methods on surface plasmon resonance sensor. This novel method was analyzed theoretically and based on it a sensor system set was established. The factors that affect the sensor's sensitivity and working range were discussed. The angular adjustment setup was simplified, errors produced by movable components were avoided and the maneuverability was enhanced with this new method. The noiseproof feature and stability of the sensor system were greatly improved as well.

一种直流充电桩电能计量精确算法

阐述直流充电桩现场环境复杂,有直流、谐波和非稳态信号,使得传统的电能计算方法产生较大误差。提出一种结合经验小波变换(EWT)和互卷积窗(Kaiser与Rife-Vincent,K-RV)的电能计算方法,该方法通过EWT和希尔伯特(Hilbert)变换分解出直流信号和非稳态信号,K-RV互卷积窗FFT计算,分解出各次谐波信号;然后计算直流、谐波及非稳态电能。实例验证,此方法具有很高的计算精度,为直流充电桩现场电能计算提供了一种精确方法。