电动汽车充换电设施电能计量及溯源方法

Accurate Measurement and Traceability Method of Electrical Energy for Charging and Discharging Devices of Electric Vehicles

国内电动汽车产业发展迅速,其充换电设施用电特性具有非线性和冲击性的特点。传统电能表已难以满足准确计量此类负荷的要求,而且缺乏相应检定溯源手段。为此提出了改进ip-iq算法对特定整数次谐波和基波电流、谐波电压进行实时分频检测,基于实时快速傅里叶变换(FFT)和准同步采样线性插值的补偿算法,以及一种基于无级放大的宽量程冲击性负荷电能计量技术,研制了计量装置,有效解决了电动汽车充换电设施电能计量的溯源问题及电压变化情况下直流电能的检定溯源问题。现场应用效果证明了所提出的电能计量方法及装置能够满足电动汽车充换电设施电能准确计量及溯源的要求。

The electric characteristics of the charging and discharging devices of the rapidly developing electric vehicle industry are nonlinear and impact-like.The traditional watt-hour meter can hardly meet the requirements of dynamically distorted load＇s accurate measurement,a drawback aggravated also by a lack of corresponding verification source method.So the improved ip-iq algorithm for specific integer harmonic wave,fundamental wave and harmonic voltage to process real-time frequency detection is proposed.The algorithms based on real-time fast Fourier transform（FFT） and quasi-synchronous sampling linear interpolation and nonlinear amplitude compensation are put forward.The broad range of impact loads measurement technique based on variable amplifying is proposed.The related devices are also developed to effectively solve the source tracing of the dynamically distorted load metering and detection of direct voltage during voltage discharging.The application effect proves the suggested electricity measurement method and devices can meet the demand of tracing the source of dynamically distorted load metering.