共直流母线光伏水泵系统集群控制研究

Research on Control Strategy and Stability of Common DC Bus Solar Pumper Cluster System

共直流母线光伏水泵集群系统适用于大规模的光伏扬水工程,可有效提高光伏扬水系统全年整体效率。详细介绍了该系统的结构组成,并根据其结构特点和系统可靠性要求,提出了基于下垂控制原理和电压补偿实现多机并联均流运行和最大功率点跟踪(MPPT)的控制策略,建立光伏水泵变频系统数学模型,分析了逆变器并联数量以及光伏阵列非线性特性对系统稳定性的影响,并实验验证了所设计系统的稳定性和控制效果。

The solar pumper cluster control system based on the common DC bus is applicable for the large scale so- lar water supply system which can enhance the effficiency.The structure of the system is introduced.The drop control method and reference voltage compensation method is proposed to achieve the current sharing and array maximum power point tracking（MPPT）.Numbers of the paralleled inverter and the nonlinear characteristics of photovoltaic array impact on system stability are studied by establishing the mathematical model of multi-paralleled inverters.FinaUy, ex- perimental result confirms the validity of the proposed control system.