稀疏采样下DC/DC输出波形时域参数计算方法  

Calculation method for time domain parameters of DC/DC output waveform under sparse sampling

作　　者：吴觅旎 徐习东[1] 裘鹏 王朝亮 WU Mi-ni;XU Xi-dong;QIU Peng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027 [2]国网浙江省电力有限公司电力科学研究院,浙江杭州310014

出　　处：《能源工程》2019年第5期1-7,共7页Energy Engineering

基　　金：国家重点研发计划资助项目(2017YFB0903100);国家电网公司科技项目(521104170043)

摘　　要：分析了纹波频谱及稀疏采样下频域计算方法的误差,设计了一种基于时域指数函数的计算方法,并提出了采样点在分段中的辨识方法,实现了稀疏采样下电流电压较高精度的计算,为直流系统电能计量及保护测控装置中的电流电压计算提供了一种参考方案。最后,以BuckDC/DC输出电能计量为例,比较分析了本方法与基于频域的电度计量方法的精确度;结果表明,在相同的采样率下,本算法相对误差和绝对误差都较小。The spectrum of the ripple and error in the frequency domain calculation method for low-frequency sampling was analyzed, a calculation method based on time domain exponential function was designed, the identification method of sampling points in the segment was proposed, the high-precision calculation of current and voltage under low-frequency sampling was realized, and a reference solution for the calculation of current and voltage in DC system energy metering and protection monitoring devices was provided. Finally, taking the Buck DC/DC output energy metering as an example, the accuracy of this method and the frequency domain based electrical metering method was compared and analyzed. The results showed that the relative error and absolute error of the algorithm were small under the same sampling rate.

关 键 词：柔性直流 分段指数函数 稀疏采样 频谱特征 采样点分布辨识 时域参数计算 电能测量 

分 类 号：TM712[电气工程—电力系统及自动化]