含直驱永磁风电场的配电网广义负荷建模

Generalized Load Modeling of Distribution Network Integrated with Direct-drive Permanent-magnet Wind Farms

以可再生能源为主的分布式电源大量、分散接入配电网,传统的负荷模型已无法描述含分布式电源的广义负荷动态特性。针对这一现状,在现有直驱永磁风电机组通用模型的基础上忽略其机械环节,提出直驱永磁风电机组的简化模型。采用综合粒子群方法和Levenberg-Marquardt方法的优化算法,对直驱永磁风电机组简化模型的参数进行了辨识,并针对不同扰动进行了模型适应性分析。在此基础上,将所提风电机组简化模型与传统负荷并联作为广义负荷的模型结构。基于轨迹灵敏度方法,分析了参数的可辨识性及辨识难易度。通过算例,给出了广义负荷在不同电压跌落程度、不同风电接入比例下的参数辨识结果,讨论了配电网等值参数对辨识结果的影响,说明了采用所述建模方法的可行性。

With large scale dispersed generation integrated into distribution network, the classical load model is no longer able to describe the dynamics of the generalized synthesis load with distributed energy resources integration. To solve this problem, a simplified model of direct-drive permanent-magnet （DDPM） wind turbine is proposed, which neglects the mechanical subsystem in the generic model of DDPM wind turbine. The combination of particle swarm optimization method and Levenberg-Marquardt method is used to estimate the simplified model parameters, and the model adaptability is also studied, Furthermore, the simplified DDPM wind turbine model and the classical load model are paralleled to illustrate the generalized synthesis load in the distribution network. The parameter identifiability and estimation difficulty of the generalized synthesis load model is analyzed according to trajectory sensitivities. The parameters are estimated according to different levels of voltage dip and different levels of wind power ratios. The effects of distribution network equivalent parameters on estimation accuracy are discussed. The estimation results have validated the applicability of the proposed modeling method.