Harmonic distortion and unbalance analysis in multi-inverter photovoltaic systems

2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM) Pub Date : 2018-06-01 DOI:10.1109/SPEEDAM.2018.8445358

F. Spertino, G. Chicco, A. Ciocia, Gabriele Malgaroli, A. Mazza, A. Russo

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引用次数: 10

Abstract

The growing penetration of distributed generation connected to the grid by power electronics converters can adversely affect the power quality. The capability of the system to host large harmonic distortions and unbalance in three-phase systems may be an issue. In case of Photovoltaic (PV) systems, the harmonic injection and unbalance are due to the transistors commutated by Pulse Width Modulation (PWM) inside the converters. Thus, power converters, to comply with the distortion limits, are equipped with filters, and control methodologies are even required for the compensation of power unbalance. In this paper, the main goal is the quantification of the impact of harmonic distortion on the unbalance. After the presentation of a theoretical approach to deal with harmonic distortion and unbalance by appropriate indicators, a PV system with multi-inverter configuration is tested. The measurements of power quality of the worst and the best converters are compared to the overall measurements of power quality for all the inverters.

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多逆变器光伏系统谐波畸变及不平衡分析

通过电力电子转换器连接到电网的分布式发电的日益普及会对电能质量产生不利影响。在三相系统中，系统承载大谐波畸变和不平衡的能力可能是一个问题。在光伏(PV)系统中，谐波注入和不平衡是由变流器内部的脉宽调制(PWM)整流晶体管引起的。因此，为了满足失真限制，功率变换器配备了滤波器，甚至需要控制方法来补偿功率不平衡。本文的主要目标是量化谐波失真对不平衡的影响。在提出了用适当的指标处理谐波畸变和不平衡的理论方法后，对多逆变器配置的光伏系统进行了测试。将最差和最佳变流器的电能质量测量值与所有变流器的电能质量总体测量值进行比较。

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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2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)

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