摘要
针对直流充电桩输出电压、电流中包含纹波导致直流电能计量准确性降低的问题,在研究直流电能计量算法基础上,分析纹波如何影响直流电能计量精度,并给出采用经典滤波法后的仿真结果,说明了经典滤波方法的有效性。提出了一种基于小波阈值函数去噪方法的现代滤波算法,对直流充电桩充电实测数据进行去噪处理,同时将改进函数与传统的软、硬阈值小波去噪法分别进行仿真结果对比分析,得到了趋势相同的直流充电数据,验证了改进小波阈值去噪算法对提高直流充电桩计量精度效果最好。
To address the low metering accuracy of DC electric energy metering due to the ripple contained in the output voltage and current of DC charging pile,based on the conventional DC electric energy metering algorithm,how ripple affects the accuracy of DC electric energy metering is analyzed,and the simulation results of using the classical filtering method are given to illustrate the effectiveness of the classical filtering method.An improved filtering algorithm based on wavelet threshold function denoising method is proposed to denoise the measured data for DC charging pile.Meanwhile,the simulation results of the improved function and the traditional soft and hard threshold wavelet denoising method were compared and analyzed respectively,and the DC charging data with the same trend were obtained.It is verified that the improved wavelet threshold denoising algorithm has the best effect on improving the measurement accuracy of DC charging pile.
作者
章江铭
沈建良
袁键
潘权锋
颜加松
李静
Zhang Jiangming;Shen Jianliang;Yuan Jian;Pan Quanfeng;Yan Jiasong;Li Jing(Marketing Service Center,State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310000,China;Hangzhou Yineng Electric Power Technology Co.,Ltd.,Hangzhou 310000,China;Harbin Research Institute of Electrical Instruments Co.,Ltd.,Harbin 150028,China)
出处
《电测与仪表》
北大核心
2022年第6期150-157,共8页
Electrical Measurement & Instrumentation
基金
国网浙江省电力公司资助项目(EPRD2019-10)。
关键词
直流充电桩
电能计量
计量精度
小波阈值去噪
DC charging pile
electric energy metering
measurement accuracy
wavelet threshold denoising
