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Management of excess energy in a photovoltaic/ grid system by production of clean hydrogen

机译:通过生产干净的氢气来管理光伏/电网系统中的多余能量

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In this article, the authors design a new clean storage device for a photovoltaic system (PV) reinforced by the electrical grid. The photovoltaic system supplies power to a DC load. When the power of the photovoltaic source is insufficient, the electrical grid compensates the energy deficit. On the other hand, if the load is satisfied and the PV source is still able of supplying energy, the energy excess is diverted to an own storage unit materialized by an electrolysis which produces gaseous hydrogen by the process of electrolysis of water. The authors show that the quantity of hydrogen produced is proportional to the photovoltaic energy excess and also to the flow of water injected into the electrolysis. In this case, it is a question of designing an electrolysis with specific characteristics, which takes into account the quantity of energy excess and the flow of water injected into it. The authors abandon the idea of controlling the water flow by means of a pumping-electrovalve system, and initiate the idea of replacing the function of the pump by the action of gravity. The work focuses on the development of an electrolysis optimization approach using the water flow control in its alliance with the PV power excess which is also maximized. For an optimized use of the global system (load and electrolysis), the authors present an architecture based on energy -converting structures (DC/DC and AC/DC). In addition, to increase the reliability and safety of the system, the authors finish by developing a power management strategy (PMS) in the designed system. This power management strategy organizes the energy flow and selects the appropriate path of this flow between the two energy sources (PV and electrical grid) and the two possible energy receivers (load and electrolysis). A complete modeling of the system is developed in the Matlab/Simulink environment. The simulation results show that the hybrid system (PV and electrical grid) is able to permanently supplying the load and potentially storing the excess of the PV energy in the form of hydrogen gas. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译:在本文中,作者设计了一种用于电网加强的光伏系统(PV)的新型清洁存储设备。光伏系统向直流负载供电。当光伏电源的功率不足时,电网将补偿能量不足。另一方面,如果满足负载并且PV源仍然能够提供能量,则多余的能量将转移到通过电解实现的自身存储单元,该电解通过水的电解过程产生气态氢。作者表明,产生的氢气量与光伏能量过量成正比,也与注入电解中的水流量成正比。在这种情况下,设计具有特定特征的电解是一个问题,要考虑到多余的能量和注入其中的水流量。作者放弃了通过泵-电动阀系统控制水流的想法,而提出了通过重力作用代替泵的功能的想法。这项工作着重于开发一种电解优化方法,该方法将水流控制与PV功率过剩结合使用,将其最大化。为了优化使用全局系统(负载和电解),作者提出了一种基于能量转换结构(DC / DC和AC / DC)的体系结构。另外,为了提高系统的可靠性和安全性,作者在设计的系统中开发了电源管理策略(PMS)作为结束语。此电源管理策略可组织能量流,并在两个能量源(PV和电网)和两个可能的能量接收器(负载和电解)之间选择此流的适当路径。在Matlab / Simulink环境中开发了系统的完整模型。仿真结果表明,混合系统(光伏和电网)能够永久性地提供负载,并有可能以氢气的形式存储多余的光伏能量。 (C)2017氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

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