风电系统改进T型逆变器并网优化模型预测控制

PREDICTIVE CONTROL OF IMPROVED T-TYPE INVERTER GRID-CONNECTED OPTIMIZATION MODEL IN WIND POWER SYSTEM

将采用一种新型变换器结构用于直驱风力发电系统中,即Boost三电平变换器(简称Boost-TL变换器)和改进T型三电平逆变器级联的并网拓扑结构。改进T型三电平拓扑比传统T型三电平结构能明显减小零状态下的传导损耗。提出一种简单易行的基于空间电压矢量的开关状态预测控制优化方法,该方法加入延时补偿并且精减模型预测控制的冗长计算量。仿真和实验结果表明,在所提出的拓扑结构基础上,采用该优化算法能使系统鲁棒性增强、动态响应快、运行范围宽、稳定性提高。

A novel converter topological structure for directly drive wind power system is proposed in this paper,the topological structure grid-connected is consists of boost three level converter(Boost-TL converter)and improved T-type threelevel inverters cascaded.The improved T type three level topology can significantly reduce the conduction loss in the zero state compared to the conventional T-type three-level structure.A simple and optimized switch state prediction control method based on space voltage vector is proposed,Which not only adds a delay compensation but also reduces the tedious computation of model predictive control.Simulation and experimental results show that the proposed topology based on the improved model predictive control algorithm can improve the robustness,dynamic response,operating range and stability of the system.