用于海上风电的准Z源逆变器并网功率控制

Grid-connected Power Control of Quasi-Z-source Inverter for Offshore Wind Power

为了克服传统模型预测控制(MPC)的缺陷并获得更好性能,针对并网准Z源逆变器(qZSI)提出了一种低计算量的模型预测功率控制。所提MPC应用多个矢量来实现并网qZSI的预期性能。通过计算ST矢量的最佳占空比,可以大大降低电感电流纹波。为了消除加权因子,提出了一种改进的滑模控制方法,用于同时控制电容电压和电感电流。此外,给出了一种快速有效的最优扇区选择方法,大大减少了MPC的计算量。因此,所提MPC的计算负担显著降低。仿真和实验结果都证明了该方法的有效性和优势。

In order to overcome the shortcomings of traditional model predictive control(MPC)and obtain better per-formance,a model predictive power control with low computational complexity for grid-tied quasi Z-source inverter(qzSI)is proposed.The proposed MPC uses multiple vectors to achieve the expected performance of grid-tied qZSI.The in-ductor current ripple can be greatly reduced by calculating the optimal duty cycle of ST vector.In order to eliminate the weighting factor,an improved sliding mode control method is proposed to simultaneously control the capacitor voltage and inductor current.In addition,a fast and effective method for optimal sector selection is presented,which greatly reduces the computational burden of MPC.Therefore,the computational burden of the proposed MPC is signifi-cantly reduced.Simulation and experimental results show the effectiveness and advantages of the proposed method.