环境因素影响风机MPPT的机理研究

Mechanism Research on the Effects of Environmental Factors for Wind Turbine MPPT

为分析环境因素对风机最大功率点跟踪(MPPT)的影响,以环境因素中气压、温度、海拨高度和相对湿度与空气密度的数学关系为基础,从机理上解释了环境因素引起的空气密度变化将改变风机原有的最优功率曲线和最优转矩曲线,并进一步定性分析了环境因素对不同MPPT算法的影响。在Matlab/Simulink分析平台上,搭建了功率信号反馈算法的双馈机组风电场模型。仿真对比了考虑环境因素的MPPT控制与不考虑环境因素的MPPT控制的风机输出特性。结果表明,风机采用考虑环境因素的MPPT控制将提高风机输出功率,从而证实了环境因素影响风机MPPT的机理。

To analyze the effects of environmental factors on MPPT of wind turbine,basing on the mathematicalrelationships of air pressure,temperature,altitude and relative humidity in environmental factors with air density,itwas explained that the change of air density caused by environmental factors will change the original optimal powercurve and optimal torque curve of the wind turbine from the mechanism. Furthermore,the influence of environmentalfactors on different MPPT algorithms was analyzed qualitatively. Based on power signal feedback MPPT algorithm,wind farm with doubly fed induction generator wind turbines was built on Matlab/Simulink platform. The MPPT controlconsidering the environmental factors and the MPPT control without considering the environmental factors weresimulated and compared. Analysis results show that the MPPT algorithm considering the environmental factors canincrease output power of wind turbine,thus it can confirm that the environmental factors affect MPPT algorithm.