小波分析辐射波动下光伏冷库压缩机结霜特性及诊断  

Frost characteristics and diagnosis of photovoltaic cold storage compressor under radiation fluctuation based on wavelet analysis

作　　者：张卓力 李明[2] 李国良[2] 徐冰 张莹[2] Zhang Zhuoli;Li Ming;Li Guoliang;Xu Bing;Zhang Ying(College of Physics and Electronic Information Yunnan Normal University;Institute of Solar Energy Yunnan Normal University)

机构地区：[1]云南师范大学物理与电子信息学院 [2]云南师范大学太阳能研究所

出　　处：《制冷与空调》2024年第1期80-86,共7页Refrigeration and Air-Conditioning

摘　　要：针对光伏直驱蒸气压缩制冷(VCR)冷库系统的压缩机结霜故障,基于小波分析开展其诊断及特性的理论和试验研究,对比测试了市电、光伏直驱压缩机未结霜与结霜的声音振动信号特性。结果表明,市电与光伏直驱压缩机结霜相比,未结霜的制冷性能分别衰减了12.86%和5.35%,当市电驱动压缩机声压级信号的功率谱以1~5dB的降幅下降至-15dB以下,光伏直驱压缩机声压级信号的功率谱以10~15dB的降幅下降至-20dB以下时,意味着压缩机将要结霜。这时可以在市电驱动下将压缩机频率调至22Hz以上和光伏直驱下将压缩机频率调至28Hz以下来避免压缩机结霜。Based on wavelet analysis,the theoretical and experimental study of compressor frosting fault in photovoltaic direct drive vapor compression refrigeration(VCR)cold storage system was carried out.The sound vibration signal characteristics of unfrosted and frosted compressors under commercial power and photovoltaic direct drive were compared and tested.It was determined that the refrigeration performance of unfrosted compressors under commercial power and photovoltaic direct drive decreased by 12.86%and 5.35%,respectively.The power spectrum of sound pressure level signals of compressors under commercial power and frosted compressors decreased by 1~5 dB to below-15 dB compared with that of unfrosted compressors.When the power spectrum of the sound pressure level signal of the mains driven compressor decreases by 1~5 dB to below-15 dB,and the power spectrum of the sound pressure level signal of the photovo-ltaic direct driven compressor decreases by 10~15 dB to below-20 dB,it means that the compressor will frost.Meanwhile,the compressor frequency should be adjusted to more than 22 Hz with the utility electricity and 28 Hz with the photovoltaic power,respectively,to avoid compressor frosting.

关 键 词：光伏冷库 结霜 小波分析 压缩机 声音振动信号 

分 类 号：TB6[一般工业技术—制冷工程]