In this paper, improved finite control set model predictive voltage control (FCS-MPVC) is proposed for the distributed energy resource (DER) in AC islanded microgrid (MG). Typically, AC MGs have two or more power electronic-based DERs, which have the ability to maintain a constant voltage at the point of common coupling (PCC) as well as perform power sharing among the DERs. Though linear controllers can achieve above-mentioned tasks, they have several restrictions such as slow transient response, poor disturbance rejection capability etc. The proposed control approach uses mathematical model of power converter to anticipate the voltage response for possible switching states in every sampling period. The proposed dual-objective cost function is designed to regulate the output voltage as well as load current under fault condition. Two-step horizon prediction technique reduces the switching frequency and computational burden of the designed algorithm. Performance of the proposed control technique is demonstrated through MATLAB/Simulink simulations for single distributed generator (DG) and AC MG under linear and non-linear loading conditions. The investigated work presents an excellent steady state performance, low computational overhead, better transient performance and robustness against parametric variations in contrast to classical controllers. Total harmonic distortion (THD) for linear and non-linear load is 0.89% and 1.4% respectively as illustrated in simulation results. Additionally, the three-phase symmetrical fault current has been successfully limited to the acceptable range.

针对交流孤岛微电网（MG）中的分布式能源（DER），提出了一种改进的有限控制集模型预测电压控制（FCS-MPVC）。通常，AC MG具有两个或多个基于电力电子的DER，它们具有在公共耦合点（PCC）上保持恒定电压以及在DER之间执行功率共享的能力。尽管线性控制器可以完成上述任务，但它们具有一些限制，例如瞬态响应慢，抗干扰能力差等。所提出的控制方法使用功率转换器的数学模型来预测每个采样周期中可能的开关状态的电压响应。提出的双目标成本函数旨在调节故障条件下的输出电压和负载电流。两步水平预测技术降低了所设计算法的开关频率和计算负担。通过MATLAB / Simulink仿真，在线性和非线性负载条件下，针对单分布式发电机（DG）和AC MG演示了所提出的控制技术的性能。与经典控制器相比，所研究的工作表现出了出色的稳态性能，低计算开销，更好的瞬态性能和针对参数变化的鲁棒性。如仿真结果所示，线性和非线性负载的总谐波失真（THD）分别为0.89％和1.4％。此外，三相对称故障电流已成功限制在可接受的范围内。