两电平并网逆变器模型预测控制研究

Research on Model Predictive Control of Two-Level Grid-Connected Inverter

模型预测控制是基于数学公式在有限时间内预测变量未来的状态,然后根据价值函数最小值选择电压矢量,相应的最优开关状态作用于逆变器。介绍了在基于两相静止坐标系下的两电平并网逆变器模型预测控制,可通过程序实现功能,不需要以往的脉冲宽度调节或内环调节,方法简单,实现容易,效果好。最后通过MATLAB/Simulink搭建模型并进行仿真分析,结果表明模型预测控制可以很好地跟踪参考电流,谐波畸变率比较低,达到并网的要求,有很好的稳态性能。

The model predictive control is based on the mathematical formula to predict the future state of the variable in a limited time. Then,the voltage vector is selected according to the minimum value of the value function and the corresponding optimal switching state is applied to the inverter. This paper introduced the two-level gridconnected inverter model predictive control based on two-phase stationary coordinate system. The method is achieved through the program function and does not require the previous pulse width adjustment or inner ring adjustment. The method is simple and easy to achieve the good effect. Finally,the model is established by MATLAB/Simulink and the simulation results show that the model predictive control can track the reference current very well,the harmonic distortion rate is relatively low,which meets the requirements of grid-connection and has good steady state performance.