基于模拟平台的MPPT无模型自适应控制研究

Research on Model Free Adaptive Control Strategy in MPPT Implementation Based on Wind Generation Imitation Platform

基于异步电机驱动永磁同步发电机(PMSG)的风力发电模拟平台,提出了一种新的最大功率点跟踪(MPPT)的控制策略。使用MPPT叶尖速比控制方案,上位机将相应风速下风力机最佳转速作为转速给定,根据风力机模型计算出该转速下的风轮输出转矩,通过变频器直接控制异步电动机转矩;PMSG转速采用无模型自适应控制器(MFAC)进行控制,以此来进行MPPT。搭建了基于该控制器的PMSG转速控制模型,并在模拟平台上进行了MPPT实验。实验结果证明该控制器可应用于风力发电系统MPPT控制。

A novel control strategy of maximum power point tracking（MPPT） implementation is proposed based on wi- nd generation imitation platform including a permanent magnet synchronous generator （PMSG） driven by induction mo- tor.According to the optimal tip speed ratio control strategy, the host computer takes the optimal speed of the turbine for a particular wind speed as the speed demand, and calculates output torque of a real wind turbine at the optimal speed,then controls the induction motor＇s torque through the inverter.At the same time,the PMSG speed is con- trolled by the model free adaptive controller（MFAC） to achieve the MPPT.A PMSG model whose speed is controlled by the MFAC is built and the MPPT experiments are completed on the imitation platform.The experimental results have effectively verified the validity and feasibility of the controller in the MPPT control strategy.