In this work, we propose a high-quality control solution for islanded microgrids with multiparallel power converters; it uses a full state-variable direct model predictive control (FSV-DMPC) and has a simple structure. Unlike the conventional cascaded control loops, the proposed FSV-DMPC solution tracks the optimal reference generated by a robust droop loop using a unified cost function. This proposal enables the FSV-DMPC to be inserted into the entire control framework with plug-and-play capability; it is robust to parameter variations while also guaranteeing dynamics and stability. We conduct a deep analysis of the proposed approach, taking into account both the characteristics of the solution and the bounded stability of the system. Through comprehensive comparative studies with a classical double-loop linear controller, we validate that our solution achieves superior output voltage regulation during the load transients in terms of voltage error and settling time. Meanwhile, similar steady-state performances are accomplished for both methods. Finally, we verify our approach experimentally in different scenarios through a lab-constructed microgrid test bench. Experimental data confirm that the proposed approach achieves excellent steady-state and transient performances and obtains accurate load sharing.

中文翻译：

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具有并联转换器的孤岛微电网的全状态变量直接预测控制

在这项工作中，我们为具有多并联功率转换器的孤岛微电网提出了一种高质量的控制解决方案；它采用全状态变量直接模型预测控制（FSV-DMPC），结构简单。与传统的级联控制回路不同，所提出的 FSV-DMPC 解决方案使用统一的成本函数跟踪由稳健的下垂回路生成的最佳参考。该提议使FSV-DMPC能够插入到具有即插即用能力的整个控制框架中；它对参数变化具有鲁棒性，同时也保证了动态性和稳定性。我们对所提出的方法进行了深入分析，同时考虑了解决方案的特征和系统的有界稳定性。通过与经典双环线性控制器的综合对比研究，我们验证了我们的解决方案在电压误差和稳定时间方面的负载瞬变期间实现了卓越的输出电压调节。同时，两种方法都实现了类似的稳态性能。最后，我们通过实验室构建的微电网测试台在不同场景中通过实验验证了我们的方法。实验数据证实，所提出的方法实现了出色的稳态和瞬态性能，并获得了准确的负载分配。