基于PSCAD的变速恒频风力发电机组动态模型构建及应用分析

Dynamic Model Construction and Application Analysis of Variable Speed Constant Frequency Wind Turbine Based on PSCAD

为了实现对风力发电机组状态的动态化监测,提高风电机组整体运行的安全性与高效性,基于PSCAD技术提出了一种变速恒频风力发电机组动态模型的构建方法与应用策略。根据变速恒频风力发电机组的基础构成,分析变速恒频风力发电机组的运行特征,引入PSCAD技术,构建变速恒频风力发电机组的机侧变流器、风力机组控制系统的动态模型。结果显示,对于随机的1组变速恒频风力发电机历史运行数据,在电机转速不断变化的条件下,构建模型输出的发电机定子电压波形与电网电压A相的波形基本一致,保证了定子输出频率不变,符合变速恒频的核心特征,具有可行性与精准性,为风力发电机组的综合调控奠定了可靠的基础。

In order to achieve dynamic monitoring of the status of wind turbines and improve the safety and efficiency of the overall operation of wind turbines,based on PSCAD technology,a construction method and application strategy for the dynamic model of variable speed constant frequency wind turbines are studied.According to the basic structure of variable speed and constant frequency wind turbine,the operation characteristics of variable speed and constant frequency wind turbine are analyzed,and the PSCAD technology is introduced to build a dynamic model of the turbine side converter and wind turbine control system.The results show that for a random set of historical operation data of a variable speed constant frequency wind turbine,under the condition of constantly changing motor speed,the generator stator voltage waveform obtained by the model in this paper is basically consistent with the waveform of grid voltage phase A,ensuring the constancy of stator output frequency,and satisfy the core characteristics of variable speed constant frequency.The proposed method is feasible and accurate,laying a reliable foundation for comprehensive regulation of wind turbines.