小型风光互补并网逆变器的改进控制

Improved Control of Grid-connected Inverter in Small-scale Wind-solar Hybrid Power System

基于直流母线组网方式的风光互补并网型发电系统结构,对并网逆变器提出一种改进控制策略。逆变器外环采用比例积分(PI)控制直流母线电压,内环电流控制采用改进的预测型无差拍控制算法。利用Matlab/Simulink工具建立了仿真模型,对逆变器进行仿真分析,并与传统无差拍控制效果进行了比较。为验证理论设计,自主搭建了风光互补发电系统样机,样机运行良好,证明了设计的正确性与可靠性。

Based on the structure of the grid-connected wind-solar hybrid power system with common DC bus, an improved deadbeat control method of the grid-connected inverter is proposed.The double-closed loop control strategy is used.The DC bus can obtain stable through outer-loop proportional integral（PI） controller and the grid-connected current is controlled by the inner-loop improved predictive deadbeat strategy.By using Matlab/Simulink, the model of the grid-connected inverter has been built, and the results has been compared to the traditional deadbeat control.To verify the theoretical design, a test prototype has been built and it works well.The experimental results demonstrate the correctness and reliability of the design.