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Multi-loop virtual synchronous generator control of inverter-based DGs under microgrid dynamics

机译：微电网动力学下基于逆变器的分布式发电的多回路虚拟同步发电机控制

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摘要

The increasing penetration of small-scale renewable power sources into the passive distribution networks brings direct deteriorated impacts on operation of microgrids due to the lack of inertia and damping property, e.g. unexpected voltage rise, increased fault level. To this end, this study presents a novel virtual synchronous generator (VSG) based multi-loop control solution aiming to efficiently manage the embedded inverter-based renewable distributed generators (DGs) in a plug-and-play fashion. With such multi-loop control structure, the virtual flux oriented control is adopted to avoid the harmonic interference and guarantee accurate control of vector orientation process in the U/I closed-loop feedback based vector control. The VSG based control is able to obtain timely current response and carry out static error free tracking control of output voltage. The pre-synchronising control aligned to the outer loop to ensure smooth transition from island to grid-connected mode is also studied. The proposed control solution is assessed through a set of simulation experiments in a microgrid for both island and grid-connected scenarios, and the numerical result confirms its technical benefits.
机译：由于缺乏惯性和阻尼特性，例如小型可再生能源越来越多地渗透到无源配电网中，对微电网的运行产生直接恶化的影响。意外的电压升高，故障级别增加。为此，本研究提出了一种新颖的基于虚拟同步发电机（VSG）的多环控制解决方案，旨在以即插即用的方式有效管理嵌入式基于逆变器的可再生分布式发电机（DG）。通过这种多环控制结构，在基于U / I闭环反馈的矢量控制中，采用虚拟磁通定向控制来避免谐波干扰并确保矢量定向过程的精确控制。基于VSG的控制能够及时获得电流响应，并对输出电压进行静态无差错跟踪控制。还研究了与外环对齐的预同步控制，以确保从孤岛模式平稳过渡到并网模式。通过在孤岛和并网情况下的微电网中进行一组模拟实验，对提出的控制解决方案进行了评估，数值结果证实了其技术优势。

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