基于变频控制的风电提水系统关键技术研究

Study on the Key Technologies of Wind-electric Pumping System with Converter Involved

针对全直驱型风力发电提水系统中各主要构件之间难以实现最佳匹配的问题,对其中的一些关键技术进行了研究,旨在提高系统运行效率。采用现代流线型风力机、永磁同步发电机、通用三相交流电动水泵以及变频控制技术,通过变频控制器调节水泵的转速,实现不同风速下的最大功率点跟踪(MPPT)。系统配置具有较大的灵活性,采用多重判据MPPT控制方法,具有良好的动态响应和跟踪效果,仿真和实验结果表明风力机工作在较高的风能利用系数下,系统运行效率得到明显提高。

In order to improve the operating efficiency of wind-electric pumping system, some key technolo- gies corresponding to the difficulty of optimal matching of main devices in a fully direct-driving wind-electric pumping system were studied. A kind of wind electric pumping system with variable-speed control characteris- tics consisting of modern streamline wind turbine, permanent-magnet synchronous generator （PMSG）, general three-phase AC power pump and converter is developed. The rotation speed of the pump can be agilely con- trolled by the converter to implement the maximum power point tracking （MPPT） control under different wind speed conditions. Furthermore, the implementation of system configuration bears more flexibility during practi- cal application. Particularly,the proposed multi-criterion MPPT algorithm ensures the system a good dynamic response and tracking performance. Simulation and experimental results show that the wind turbine can oper- ate with a high performance coefficient,and the system operating efficiency is improved obviously as well.