摘要
针对直流充电桩快速变化直流电流和电压的波形模态描述尚不完善、可用样本数据不足、波形特性不清楚、缺少波形模态数学模型的问题,首先,建立充电桩直流电流和电压信号的离散随机数学模型和时频域表征模型;然后,针对实测充电直流信号,提取30种波形模态,提出三大类波形模态及其对应的特征参量,并据此建立三大类波形模态的波形特征库;其次,采用时频原子的方法建立3类波形模态的数学模型,给出实际波形对应的人工测试信号模型,解决了反映实际波形模态重要波形特征问题;最后,提出构建测试电能表计量误差的直流信号参比模型的原则,据此,建立动态电能计量参比测试信号模型,表征了动态直流测试信号的特征信息,用于提升直流电能表动态试验和改进直流电能表的测试标准。
Aiming at the problems that the waveform modal description of the fast changing DC current and voltage of the DC charging pile is not perfect,the available sample data is insufficient,the waveform characteristics are not clear,and the mathematical model of the waveform mode is lacking.Firstly,the time-frequency domain characterization model of DC and voltage signal of charging pile is established.Then,30 waveform modes are extracted,and three waveform modes and their corresponding characteristic parameters are proposed.Based on this,the waveform feature library of three kinds of waveform modes is established.Secondly,the mathematical model of three waveform modes is established using the time-frequency atom method,which solves the problem of reflecting the important waveform characteristics of the actual waveform modes.Finally,the reference test signal model of dynamic energy metering is established,and the characteristic information of the dynamic DC test signal is characterized.
作者
王学伟
李松竹
袁瑞铭
焦东翔
巨汉基
孟静
WANG Xuewei;LI Songzhu;YUAN Ruiming;JIAO Dongxiang;JU Hanji;MENG Jing(School of Information Science and Technology,Beijing University of Chemical Technology,Chaoyang District,Beijing 100029,China;Meterology Center,State Grid Jibei Electric Power Company Limited,Xicheng District,Beijing 100045,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China)
出处
《电网技术》
北大核心
2025年第2期759-770,I0102,共13页
Power System Technology
基金
国家电网有限公司科技项目(计及动态特征的直流电能计量与溯源关键技术研究(5700-202314248A-1-1-ZN))。
关键词
直流充电桩
快速变化波形模态
波形特征参量
动态电能
参比测试信号模型
DC charging pile
rapidly changing waveform mode
waveform characteristic parameters
dynamic electric energy
reference test signal model
