蓄电池内阻测试信号小波去噪

De-noising Processing of Battery Internal Resistance Test Signal Based on Wavelet Transform

利用小波变换方法对蓄电池内阻测量过程中产生的干扰进行了滤波。交流激励法在线测量蓄电池内阻过程中,现场周围存在各种干扰,给测试信号带来噪声或突变问题。介绍了交流激励法测量阻抗及小波分析信号的基本原理;提取UPS系统现场工况环境下的测试信号序列,运用小波去噪方法进行处理,获取消除噪声后的信号序列。仿真结果表明,利用小波变换理论能够有效检测出信号中的突变现象,重构有用信号,有效消除噪声干扰。

The de - noising method of battery internal resistance test signals using wavelet transform theory is studied. There are a lot of interferences exiting in running of power equipment of UPS system, which bring noise and signal mutation problems to the test signal in AC impedance method by online battery internal resistance measurement. In this paper, the test signal sequence collected from the site condition has been processed by the method of wavelet de - noising in the Matlab platform. The simulation results show that the wavelet de - noising method can be used for detecting the signal mutation, reconstructing the useful signal, and eliminating the noise interference effectively.