Modeling and Design of Primary Control’s Inner Loops for Droop-Controlled Three-Phase Inverters within a Microgrid System

Camelia Ait Hammouda, R. Bradai, R. Boukenoui, Abdelhammid Kherbachi, Ahmed Bendib
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Abstract

in Microgrid (MG) systems, the output voltage controller within the primary control, called the “inner control is essential for regulating the output of the inverters and guaranteeing a high-stability operation. This paper addresses the modeling and design of the primary control’s inner loops intended for voltage-controlled three-phase LC-filtered inverters forming an islanded MG. The designed inner controller is a dual-loop control structure, consisting of outer voltage and inner current control loops, implemented in the dq$\theta-$frame. Each control loop includes three PI controllers for the direct, quadrature, and DC (zero) components regulation. The modeling of the voltage-controlled LC-filtered inverter, as well as the voltage/current inner control loops in the dq$\theta-$frame, is provided. The tuning of the controllers’ parameters is done with the help of a developed straightforward and efficient design approach. Simulations are carried out in MATLAB/SimPowerSystem environment. The findings reveal that the designed inner controller for output voltage tracking is effective, with high performance in both steady and transient states, under a variety of operating conditions.
微电网下垂控制三相逆变器主控制内回路建模与设计
在微电网(MG)系统中,初级控制中的输出电压控制器,称为“内部控制”,对于调节逆变器的输出和保证高稳定性运行至关重要。本文讨论了用于形成孤岛MG的电压控制三相lc滤波逆变器的初级控制内环的建模和设计。所设计的内控制器是一个双环控制结构,由外部电压和内部电流控制环组成,在dq$\theta-$框架中实现。每个控制回路包括三个PI控制器,用于直接,正交和直流(零)元件调节。给出了电压控制lc滤波逆变器的建模,以及dq$\theta-$帧中的电压/电流内控制回路。控制器参数的调整是在一种简单有效的设计方法的帮助下完成的。在MATLAB/SimPowerSystem环境下进行仿真。研究结果表明,所设计的输出电压跟踪内控制器在各种工作条件下都具有良好的稳态和暂态性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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