低温对风力发电机组偏航液压制动系统的影响及优化

低温环境下液压油黏度增大导致风力发电机组偏航液压制动系统性能下降,无法满足风机正常运行和安全的要求。对偏航液压制动系统受低温影响的原因及过程进行了理论分析,并对分析结果进行了仿真与试验验证。为提高偏航液压制动系统在低温环境下的响应性能,验证了短孔阻尼和制动器闭环串并联结构对提高系统制动建压和阻尼卸压速度的可行性及效果。结果表明,该方法可有效提高偏航液压制动系统在机舱低温工况下的制动能力,可为偏航液压制动系统的设计提供有益参考。

Influence of Low Temperature on Wind Turbine Yaw Hydraulic Brake System and Optimization

The performance of yaw hydraulic brake system is reduced and cannot meet the operation and safety requirements of wind turbine, because hydraulic oil has higher viscosity at low temperature. Theoretically analyze the reason and process of yaw hydraulic brake system affected by low temperature and verify the conclusion through simulation and experiments. To improve response performance of yaw hydraulic brake system, use the short hole damping and brake closed-loop series-parallel structure to increase brake pressure build-up and damping pressure-relief speed, meanwhile the feasibility and effect of solution are demonstrated. The results show that the methods can effectively improve braking ability of yaw hydraulic brake system under low temperature conditions in nacelle. The study provides a useful reference for the design of yaw hydraulic brake system.