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Optimization strategy for high efficiency 20?kW-class direct coupled photovoltaic-electrolyzer system based on experiment data
摘要： For the first time worldwide, the PEM electrolyzer directly coupled with the up-to-20 kW PV panels to produce hydrogen is reported as a demonstration of a high solar-to-hydrogen (STH) efficiency CO2-free hydrogen-production system. With the direct-coupling configuration, the power loss on an interlink DC/DC converter and its cost are avoided as known. Since the maximum power point (MPP) of PV unit is fluctuated by the fluctuating irradiance, this MPP is tracked by changing the number of the electrolyzer cell controlled by the MPPT algorithm, which allows changing the PV operating voltage. In our system, the averaged PV efficiency is 17.2%, and the electrolysis efficiency is 86.5% in a whole-day test. Thus, the STH efficiency is 14.9%. The hydrogen generation capacity of 18.6 Nm3 (5.01 kg CO2 reduction) is demonstrated in that whole-day test. Besides, the method to make the simulation model of the system from on-site data is shown. As a result, neither the preliminary test nor off-site test is needed. Therefore, this method can be used to check the condition of the entire system and each component in long-term operation which has never been found in the literature. The simulated model can also be used to investigate the PV-electrolyzer system.
关键词： Direct coupling,MPPT,Water electrolyzer model,Photovoltaic model,Hydrogen producing
更新于2025-09-16 10:30:52
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Comparative Study of Different DC/DC Power Converter for Optimal PV System Using MPPT (P&O) Method
摘要： The objective of this work is to show when and how to choose the type of DC/DC power converter that must be introduced in a stand alone PV solar system’s optimization process, which is necessary to characterize the area’s climatic conditions of the system implementation, take into account the partial shading effect on the Photovoltaic Generator (PVG). In addition, determine the resistivity of the load that envisaged to be introduced with the help of the direct coupling responses of the PVG. Based on the MATLAB/Simulink software and the PVG data sheet choice, we could plot the current-voltage (I-V) and power-voltage (P-V) characteristic, using the manufacturer data and determining the maximum power point (MPP), as a function of the area’s weather conditions variations, at the same time observing the direct coupling response of the load adapted to the PVG. From this observation, we can specify the DC/DC power converter type to be introduced in the production optimization process of a standalone PV solar system. Thus, we must use a Boost converter type, if the direct coupling voltages responses are higher than those of MPP responses, or a Buck converter type in the opposite case, or both at the same time Buck-Boost converter type, if we need to increase and decrease the voltage.
关键词： MPPT,DC/DC power converter,resistive load,PVG,Direct coupling,shading effect
更新于2025-09-10 09:29:36