Partial Harmonic Current Compensation Applied to Multiple Photovoltaic Inverters in a Radial Distribution Line

电力电子 Pub Date : 2019-12-01 DOI:10.1109/COBEP/SPEC44138.2019.9065362

André L. P. de Oliveira, L. S. Xavier, J. Callegari, A. F. Cupertino, V. F. Mendes, H. Pereira

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引用次数: 1

Abstract

The increase of the current harmonic content due to nonlinear loads is one of the main concerns in power systems. Therefore, the possibility to use the current margin of photovoltaic (PV) systems to provide harmonic current compensation have been addressed in several works. In this context, an important point is to ensure that the PV inverter current does not extrapolate its rated current peak. For this purpose, dynamic current saturation techniques are adopted, incorporating the partial harmonic current compensation capability in PV inverters. Thereby, this work proposes to implement the partial harmonic current compensation applied to multiple PV inverters using a dynamic saturation technique based on an open-loop algorithm. Furthermore, a radial distribution line is used to analyze the effects of harmonic compensation sharing among PV inverters under different solar irradiance conditions. The current margin of PV systems are combined to compensate nonlinear load currents in the line. Simulation results show the improvements in the grid power quality, ensuring a total demand distortion (TDD) lower than 5%, as recommended by the IEEE Std 519-2014.

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径向配电线路中多台光伏逆变器的部分谐波电流补偿

非线性负荷引起的电流谐波含量的增加是电力系统的主要问题之一。因此，利用光伏(PV)系统的电流余量提供谐波电流补偿的可能性已经在一些工作中得到了解决。在这种情况下，重要的一点是要确保光伏逆变器电流不外推其额定电流峰值。为此，采用动态电流饱和技术，结合光伏逆变器的部分谐波电流补偿能力。因此，本研究提出采用基于开环算法的动态饱和技术实现适用于多个光伏逆变器的部分谐波电流补偿。利用径向配电网分析了不同太阳辐照度条件下光伏逆变器间谐波补偿分担的影响。将光伏系统的电流裕度组合起来补偿线路中的非线性负载电流。仿真结果表明，该方法改善了电网电能质量，确保总需求失真(TDD)低于5%，符合IEEE标准519-2014的推荐值。

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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电力电子

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