Considering the spread spectrum problem of finite-control-set model predictive control (FCS-MPC), a fixed switching frequency strategy based on cost function reconstruction is proposed in this paper. It achieves a fixed switching frequency by selecting the optimal voltage vector through the redefined cost function. A frequency coefficient is added to this to change the selecting area of the optimal voltage vector. The proposed strategy reshapes the spectrum of the inductor current and focuses the harmonics near the switching frequency so that the design of the output LC filter is easier. Without adding any modulators or greatly increasing the number of computations, the proposed strategy reserves the excellent dynamic performance of the FCS-MPC and is convenient in terms of implementation. Finally, a 1 kW single-phase inverter is built and experiments are conducted. Experimental results demonstrate that the proposed control strategy realizes a fixed switching frequency. In addition, it has a comparative dynamic response speed and number of calculations when compared to dead-beat-based FCS-MPC. These features are beneficial to its application.

考虑到有限控制集模型预测控制（FCS-MPC）的扩频问题，提出了一种基于代价函数重构的固定开关频率策略。通过重新定义的成本函数选择最佳电压矢量，可以达到固定的开关频率。向其添加频率系数以改变最佳电压矢量的选择区域。所提出的策略可重塑电感器电流的频谱，并将谐波集中在开关频率附近，从而使输出LC滤波器的设计更加容易。在不添加任何调制器或不大大增加计算数量的情况下，所提出的策略保留了FCS-MPC的出色动态性能，并且在实现方面很方便。最后，建造了一个1 kW单相逆变器，并进行了实验。实验结果表明，所提出的控制策略实现了固定的开关频率。此外，与基于无差拍的FCS-MPC相比，它具有相对动态响应速度和计算数量。这些功能有利于其应用。