An Enhanced Power Sharing Scheme With Voltage Unbalance and Distortion Compensation in an Islanded AC Microgrid Using CSF-MPC

IF 1.6 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Circuit Theory and Applications Pub Date : 2024-12-18 DOI:10.1002/cta.4392

Ranjith Kumar Uppuluri, Rajasekharareddy Chilipi, Mahmadasraf A. Mulla

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Abstract

This paper presents an enhanced power sharing scheme (EPSS) for parallelly connected distributed generators (DGs) in an islanded microgrid (MG) using a constant switching frequency-model predictive control (CSF-MPC). Unlike conventional droop control, wherein only accurate real power sharing among DGs is possible, the EPSS enables accurate sharing of reactive and harmonic powers even under mismatched line impedances. Additionally, the voltage unbalance and distortion at the point of common coupling (PCC) are mitigated. The EPSS is implemented using a reference voltage that consists of (1) the fundamental droop control; (2) the virtual impedance control; (3) the unbalance compensation control; and (4) the harmonic compensation control. The performance of the EPSS is tested on a MG consisting of two DGs of both similar and dissimilar capacities under a step changes in loads. The EPSS is implemented using CSF-MPC, which offers superior performance compared with conventional proportional plus integral and proportional resonant controllers. The simulation and hardware-in-loop results confirm the effectiveness of the EPSS in addressing power sharing issues and mitigating both distortion and unbalance of PCC voltage.

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基于CSF-MPC的孤岛交流微电网电压不平衡和失真补偿的功率共享方案

本文提出了一种基于恒开关频率模型预测控制（CSF-MPC）的孤岛微电网并联分布式发电机组功率共享方案（EPSS）。与传统的下垂控制不同，在dg之间只能精确地共享实际功率，EPSS即使在不匹配的线路阻抗下也能准确地共享无功和谐波功率。此外，还可以减轻共耦合点（PCC）的电压不平衡和畸变。EPSS是使用参考电压实现的，该参考电压包括：(1)基本下垂控制；(2)虚拟阻抗控制；(3)不平衡补偿控制；(4)谐波补偿控制。在负载阶跃变化的情况下，在由两个相似和不同容量的dg组成的MG上测试了EPSS的性能。EPSS采用CSF-MPC实现，与传统的比例加积分控制器和比例谐振控制器相比，具有优越的性能。仿真和硬件在环结果证实了EPSS在解决功率共享问题和减轻PCC电压畸变和不平衡方面的有效性。

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来源期刊

International Journal of Circuit Theory and Applications 工程技术-工程：电子与电气

CiteScore

3.60

自引率

34.80%

发文量

277

审稿时长

4.5 months

期刊介绍： The scope of the Journal comprises all aspects of the theory and design of analog and digital circuits together with the application of the ideas and techniques of circuit theory in other fields of science and engineering. Examples of the areas covered include: Fundamental Circuit Theory together with its mathematical and computational aspects; Circuit modeling of devices; Synthesis and design of filters and active circuits; Neural networks; Nonlinear and chaotic circuits; Signal processing and VLSI; Distributed, switched and digital circuits; Power electronics; Solid state devices. Contributions to CAD and simulation are welcome.