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有限控制集模型预测控制(finite-control-set model predictive control,FCS-MPC)依靠被控逆变器所具有开关状态对控制目标滚动寻优计算。为减小多电平逆变器中滚动计算开关状态所需时间,该文对经典有限控制集模型预测电流控制进行改进。首先,利用控制系统的离散数学模型和参考电流求得被控逆变器在此参考电流下所应输出的参考电压值。此时,引进SVPWM中的分扇区计算概念,判断参考电压所处扇区,最后将该参考电压所处扇区内所包含的开关状态来循环寻优计算。最后Matlab/Simulink仿真平台搭建二极管钳位型五电平并网逆变器系统模型,通过仿真结果,得以验证改进算法的正确性和实用性。
The finite-control-set model predictive control (FCS-MPC) relies on the switch state of the controlled inverter to optimize the control target rolling. In order to reduce the time needed to calculate the switching state in a multi-level inverter, this paper improves the predictive current control of the classical finite control set model. First, the discrete voltage model and reference current of the control system are used to obtain the reference voltage of the controlled inverter under this reference current. At this time, the concept of sub-sector calculation in SVPWM is introduced to judge the sector where the reference voltage is located and finally the switching state contained in the sector where the reference voltage is located is cyclically optimized. Finally, the simulation model of diode-clamped five-level grid-connected inverter is established by Matlab / Simulink simulation platform. The simulation results verify the correctness and practicability of the improved algorithm.