为了探究云贵高原冬季凝冻环境下叶片结冰及抗凝冻改造对5 MW风电机组振动特性的影响，评估机组在复杂气候条件下的运行安全性，依托3台经主动气热法改造的抗凝冻试验机组，采集了其历时4个月的现场运行振动监测数据。研究选取机舱等关键部位的9个振动状态变量，计算特征参数并结合限值标准，通过纵向与横向对比分析，综合判定了机组的振动状态及演变趋势。结果表明：3台试验机组的振动烈度整体处于较低水平且个体差异微小，未见异常波动；叶片结冰引发的质量不平衡、气动外形改变以及新增防除冰设备带来的载荷变化，并未导致机组振动显著加剧。结论认为，在凝冻环境下，叶片结冰及抗凝冻改造措施对5 MW风电机组整体振动水平无显著影响，机组结构动力学性能稳定，具备长周期安全运行能力。

To investigate the effects of blade icing and anti-icing modifications on the vibration characteristics of 5 MW wind turbines in the winter icing environment of the Yunnan-Guizhou Plateau, and to evaluate their operational safety under complex climatic conditions, this study utilizes three anti-icing test turbines retrofitted with an active aerothermal method. Field vibration monitoring data spanning four months were collected. Nine vibration state variables at critical locations, such as the nacelle, were selected. By calculating characteristic parameters and applying threshold criteria, longitudinal and comparative analyses were conducted to comprehensively evaluate the vibration status and evolution trends of the turbines. The results indicate that the overall vibration severity of the three test turbines remains at a low level with negligible individual variations, and no abnormal fluctuations were observed. The mass imbalance and aerodynamic profile alterations induced by blade icing, as well as the load variations caused by the newly installed anti-icing equipment, did not lead to a significant exacerbation of turbine vibrations. It is concluded that, under icing conditions, neither blade icing nor the anti-icing modifications have a significant impact on the overall vibration levels of the 5 MW wind turbines. The structural dynamic performance of the turbines remains stable, demonstrating the capability for long-term safe operation.