Abstract A novel droop controller that ensures a desired inverter current limitation and guarantees the stable operation of inverter-based microgrids under extreme load conditions, is proposed in this paper. Opposed to existing d q framework-based droop controllers that align the output voltage on d axis, here the inverter current is aligned on d axis in order to achieve two main goals: i) limitation of the RMS value of each inverter current during transients, without a need for saturation units that guarantee only steady-state limitation and require adaptation techniques for adjusting their limits and ii) a rigorous proof of closed-loop system stability for the entire microgrid. In particular, the proposed approach significantly simplifies the stability analysis of the microgrid, since it can be investigated through a Jacobian matrix of reduced size. Simulation results are given to highlight the superiority of the proposed controller when compared to a conventional droop controller under extreme load conditions, while experimental validation in a lab-scale microgrid is also provided.

中文翻译：

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极端负载条件下固有限流逆变微电网控制设计与小信号稳定性分析

摘要 本文提出了一种新型下垂控制器，可确保所需的逆变器电流限制并保证基于逆变器的微电网在极端负载条件下稳定运行。与现有的基于 dq 框架的下垂控制器在 d 轴上对齐输出电压相反，这里逆变器电流在 d 轴上对齐以实现两个主要目标：i) 在瞬态期间限制每个逆变器电流的 RMS 值，没有需要仅保证稳态限制的饱和单元，并需要调整其限制的适应技术，以及 ii) 整个微电网闭环系统稳定性的严格证明。特别是，所提出的方法显着简化了微电网的稳定性分析，因为它可以通过缩小尺寸的雅可比矩阵进行研究。仿真结果突出了所提出的控制器在极端负载条件下与传统下垂控制器相比的优越性，同时还提供了实验室规模微电网中的实验验证。