Modular Multilevel Converters for Large-Scale Grid-Connected Photovoltaic Systems: A Review
Modular Multilevel Converters for Large-Scale Grid-Connected Photovoltaic Systems: A Review
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DOI：
10.3390/en14196213
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发表时间：
2021-09
期刊：
影响因子：
3.2
通讯作者：
S. Alotaibi;A. Darwish
中科院分区：
文献类型：
--
作者：
S. Alotaibi;A. Darwish
随着电力电子器件和技术的进步，光伏发电系统作为分布式发电系统的能源越来越受到人们的欢迎。大型太阳能光伏发电厂正在成为满足快速增长的电能需求的首选解决方案，因为它们可以在不到一年的时间内安装，而传统发电厂的安装时间约为四年。模块化多电平逆变器（MMI）是将这些大型光伏电站连接到中压（MV）电网的最佳解决方案，因为它们具有许多优点，例如提供更好的电能质量，具有更高的效率，提供更好的可靠性以及可扩展性。然而，MMI仍在发展，需要一些改进，才能在工业，中压和高压网络中安全实施。本文的主要目的是审查目前的MMI拓扑结构时，用于光伏应用。该审查的目的是提出一个全面的研究最近的各种子模块电路与MMI拓扑结构。光伏逆变器的最大功率点跟踪（MPPT）控制方案将被广泛探讨。然后，将介绍和比较PV MMI的不同控制策略，以全面概述平衡和不平衡电网条件下的子模块平衡技术、范围和能力。此外，本文还将讨论光伏MMI系统在电网中的应用前景。
The use of photovoltaic (PV) systems as the energy source of electrical distributed generators (DG) is gaining popularity, due to the progress of power electronics devices and technologies. Large-scale solar PV power plants are becoming the preferable solution to meet the fast growth of electrical energy demand, as they can be installed in less than one year, as compared to around four years in the case of conventional power plants. Modular multilevel inverters (MMIs) are the best solution to connect these large-scale PV plants to the medium-voltage (MV) grid, due to their numerous merits, such as providing better power quality, having higher efficiency, providing better reliability, and their scalability. However, MMIs are still progressing and need some improvement before they can be implemented safely in the industrial, medium, and high voltage networks. The main purpose of this paper is to review the present MMIs topologies when used in PV applications. The review aims to present a comprehensive study of the various recent submodule circuits associated with MMI topologies. Maximum power point tracking (MPPT) control schemes for PV inverters will be explored extensively. Then, the different control strategies of PV MMIs will be presented and compared to give a holistic overview of the submodules balancing techniques, ranges, and capabilities under balanced and unbalanced grid conditions. In addition, the paper will discuss the future of PV MMIs systems in electricity networks.