Asmy N R Anisha, Ramprabhakar J, Anand R, Meena V P, Jadoun Vinay Kumar
Department of Electrical and Electronics Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Bengaluru, India.
Department of Electrical Engineering, National Institute of Technology Jamshedpur, Jamshedpur, Jharkhand, 831014, India.
Sci Rep. 2025 Mar 25;15(1):10333. doi: 10.1038/s41598-025-94690-y.
Microgrids integrate various distributed energy resources to enhance energy reliability and sustainability. Power electronic converters are vital in microgrids since they provide efficient, reliable, and flexible operation. There are numerous controllers available that can be applied to these converters, and lately, fractional-order controllers (FOC) have gathered huge recognition. These controllers provide enhanced flexibility and superior performance in managing dynamic behavior. There are various structures of FOCs, and this article predominantly focuses on comparing different cascaded fractional order controllers (C-FOC). Four distinct topologies of cascaded fractional order proportional integral (C-FOPI) controllers are selected for comparison with one another and with the cascaded proportional integral controller used in a non-minimum phase converter, such as the boost converter employed in a microgrid system. The controllers are optimized using the Elephant Herd Optimization (EHO) algorithm with the Integral of Time-weighted Absolute Error (ITAE) serving as the performance metric. Each controller is subject to variation in system changes, and the outcomes are documented and correlated to ascertain the optimum structure. The simulation outcomes endorsed notable advancements in terms of transient and steady-state performance, featuring improved resilience to parameter changes, a reduction of 36.6% in settling time, 15% in overshoot, 20.1% in rise time, an improved phase margin of more than 51% and more than 50% reduction in performance indices compared to traditional cascaded proportional integral controllers (PI-PI).
微电网整合各种分布式能源资源，以提高能源的可靠性和可持续性。电力电子变换器在微电网中至关重要，因为它们能实现高效、可靠且灵活的运行。有许多控制器可应用于这些变换器，最近，分数阶控制器（FOC）获得了广泛认可。这些控制器在管理动态行为方面提供了更高的灵活性和卓越的性能。分数阶控制器有多种结构，本文主要聚焦于比较不同的级联分数阶控制器（C-FOC）。选择了四种不同拓扑结构的级联分数阶比例积分（C-FOPI）控制器相互比较，并与非最小相位变换器（如微电网系统中使用的升压变换器）中采用的级联比例积分控制器进行比较。使用象群优化（EHO）算法对控制器进行优化，将时间加权绝对误差积分（ITAE）作为性能指标。每个控制器都要经受系统变化的影响，记录结果并进行关联，以确定最优结构。仿真结果表明，在瞬态和稳态性能方面有显著提升，具有更强的参数变化适应性，调节时间减少36.6%，超调量减少15%，上升时间减少20.1%，相位裕度提高超过51%，与传统级联比例积分控制器（PI-PI）相比，性能指标降低超过50%。
