A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation

Q2 Computer Science

International Journal of Electrical and Electronic Engineering and Telecommunications Pub Date : 2023-03-16 DOI:10.11648/j.jeee.20231101.14

Crescent Onyebuchi Omeje

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引用次数: 0

Abstract

: This research was conducted to verify the significance of the LCL-filter on the grid current and the impact of variable fault resistance values on the reactive power genereated in a grid-tied inverter. The stability of LCL-type grid connected inverter with capacitor current feedback in active damping state was evaluated in this paper. The effects of balanced and unbalanced grid faults on the active and reactive power was studied through simulation at different fault resistance values of 0.00025Ω and 2.5Ω. The FFT waveforms showed that THD values of 48.56% and 38.45% were achieved for the grid voltage at 0.00025Ω and 2.5Ω fault resistance while THD values of 9.50% and 4.41% were obtained for the grid current at a varied current feedback coefficient (K CP ) of 4.75 and 14.75. Simulation results also showed that a very negligible real and reactive power was gained with a zero grid voltage within the fault zone at 0.00025Ω fault resistance. At a 2.5Ω fault resistance, a voltage sag was produced which accounted for the transient response in the real power generated and reactive power absorbed during the fault period. The result obtained from the root-locus plot showed that the loci for the derived LCL-filter current transfer function intersected at +j 8.734 and -j 8.734 which makes the system marginally stable All simulation procedures were realized in MATLAB/SIMULINK 2015.

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基于模型的lcl型并网变流器在微网分布式发电平衡与不平衡故障下的应用

:本研究旨在验证lcl滤波器对电网电流的重要性，以及变故障电阻值对并网逆变器无功功率的影响。对电容电流反馈lcl型并网逆变器在主动阻尼状态下的稳定性进行了评价。通过仿真研究了在0.00025Ω和2.5Ω不同故障电阻值下电网平衡和不平衡故障对有功和无功功率的影响。结果表明，在0.00025Ω和2.5Ω故障电阻处，电网电压的THD值分别为48.56%和38.45%;在电流反馈系数(K CP)为4.75和14.75时，电网电流的THD值分别为9.50%和4.41%。仿真结果还表明，在故障电阻0.00025Ω处，故障区内电网电压为零时，获得的实功功率和无功功率可以忽略不计。当故障电阻为2.5Ω时，产生电压暂降，该暂降是故障期间产生的实际功率和吸收的无功功率的暂态响应。由根轨迹图得到的结果表明，所推导的lcl滤波器电流传递函数的轨迹在+j 8.734和-j 8.734处相交，使得系统处于边缘稳定状态。所有仿真程序均在MATLAB/SIMULINK 2015中实现。

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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来源期刊

International Journal of Electrical and Electronic Engineering and Telecommunications Engineering-Electrical and Electronic Engineering

CiteScore

5.90

自引率

0.00%

发文量

期刊介绍： International Journal of Electrical and Electronic Engineering & Telecommunications. IJEETC is a scholarly peer-reviewed international scientific journal published quarterly, focusing on theories, systems, methods, algorithms and applications in electrical and electronic engineering & telecommunications. It provide a high profile, leading edge forum for academic researchers, industrial professionals, engineers, consultants, managers, educators and policy makers working in the field to contribute and disseminate innovative new work on Electrical and Electronic Engineering & Telecommunications. All papers will be blind reviewed and accepted papers will be published quarterly, which is available online (open access) and in printed version.