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.
作者
张卓力
李明
李国良
徐冰
张莹
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)
出处
《制冷与空调》
2024年第1期80-86,共7页
Refrigeration and Air-Conditioning
关键词
光伏冷库
结霜
小波分析
压缩机
声音振动信号
photovoltaic driven cold storage
frost
wavelet analysis
compressor
acoustic vibration signal
作者简介
张卓力,硕士研究生,研究方向为光伏冷库故障检测;通信作者:张莹,博士,硕士生导师,主要从事热力学循环分析与优化,光伏冷库动态仿真及控制研究。
