Abstract This paper presents a novel optimal real-time controller for inverter-based distributed generation units in an islanded microgrid. With respect to the fact that the microgrid has a completely nonlinear structure and its dynamics is constantly changing, the linear controllers with constant and inflexible coefficients cannot maintain proper response in a wide range of operation conditions. Hence, an optimal nonlinear controller that theirs coefficient are adjusted in a real-time manner based on fuzzy logic is presented. To improve the performance of the proposed real-time controller, its fuzzy system parameters are determined using an offline particle swarm optimization algorithm for various operation conditions. In the proposed real-time controller, proportional-resonant controllers are used due to their advantage in the stationary reference frame for controlling the voltage and current of distributed generation units in the microgrid. Capability and efficiency of the proposed real-time controller are evaluated in different operation scenarios in MATLAB/Simulink environment. The simulation results shows that changing the control coefficients online with respect to operation condition leads to achievement of an optimum answer for voltage during the occurrence of islanding condition and also in case of load variation in the islanded microgrid.

中文翻译：

---

微电网系统中逆变器接口分布式发电的在线最优静止参考系控制器

摘要 本文提出了一种新颖的优化实时控制器，用于孤岛微电网中基于逆变器的分布式发电机组。鉴于微电网具有完全非线性的结构，其动态特性是不断变化的，具有恒定和不灵活系数的线性控制器无法在较宽的运行条件下保持适当的响应。因此，提出了一种基于模糊逻辑的实时调整其系数的最优非线性控制器。为了提高所提出的实时控制器的性能，使用离线粒子群优化算法针对各种操作条件确定其模糊系统参数。在建议的实时控制器中，比例谐振控制器因其在固定参考系中的优势而被使用，用于控制微电网中分布式发电机组的电压和电流。在 MATLAB/Simulink 环境中的不同操作场景中评估了所提出的实时控制器的能力和效率。仿真结果表明，在孤岛条件发生期间以及在孤岛微电网负载变化的情况下，根据运行条件在线改变控制系数可以实现电压的最佳响应。