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Primary Control Design Based on Capacity Curves for Inverter-Based Microgrids

机译：基于容量曲线的逆变器微电网一次控制设计

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摘要

In this paper, a multi-loop controller for an inverter-based microgrid (MG) system is proposed in order to control the voltage of point of common coupling (PCC) and to perform accurate active and reactive power sharing. Inner current and voltage loops, that are designed based on the dynamic model of the MG system, are used to obtain appropriate switching functions for interfaced inverters and the reference values for currents of DG units. Also, a modified droop controller is introduced to enhance the performance of the designed voltage control loop. In order to improve the dynamic operation of the proposed controller in supplying demanded power for harmonically distorted loads, the extraction of harmonic components of PCC voltages is accomplished. Upper and lower limits of voltage amplitude and frequency for droop curves are analyzed using capacity curves of each DG unit. The effect of renewable power generation uncertainty on DC link voltage variations is also compensated using an additional control loop in multi-loop structure. The performance of the proposed control technique has been verified by simulation using MATLAB/SIMULINK environment which shows a proper steady state and transient performance during changes in generation and non-linear harmonically distorted loads.
机译：本文提出了一种基于逆变器的微电网（MG）系统的多回路控制器，以控制公共耦合点（PCC）的电压并执行精确的有功和无功功率共享。基于MG系统的动态模型设计的内部电流和电压环路用于获得接口逆变器的适当开关功能以及DG单元电流的参考值。此外，还引入了改进的下垂控制器，以增强设计的电压控制环路的性能。为了改善所提出的控制器在为谐波失真负载提供所需功率时的动态操作，完成了PCC电压谐波分量的提取。使用每个DG单元的容量曲线分析下垂曲线的电压幅度和频率上限和下限。还可以使用多回路结构中的附加控制回路来补偿可再生能源发电不确定性对直流母线电压变化的影响。通过使用MATLAB / SIMULINK环境进行仿真，已验证了所提出控制技术的性能，该环境在发电和非线性谐波失真负载变化期间显示出适当的稳态和瞬态性能。

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