scholarly journals A hybrid power system based on fuel cell, photovoltaic source and supercapacitor

2020 ◽  
Vol 2 (5) ◽  
Author(s):  
Seydali Ferahtia ◽  
Ali Djerioui ◽  
Samir Zeghlache ◽  
Azeddine Houari
Keyword(s):  
Fuel Cell ◽  
Power Sharing ◽  
Dc Microgrid ◽  
Storage Element ◽  
Load Variations ◽  
Management Algorithm ◽  
Controversial Topic ◽  
Management Method ◽  
Dc Bus ◽  
Bus Voltage

Abstract In this study, we present an ameliorated power management method for dc microgrid. The importance of exploiting renewable energy has long been a controversial topic, and due to the advantages of DC over the AC type, a typical DC islanded micro-grid has been proposed in this paper. This typical microgrid is composed of two sources: fuel cell (FC), solar cell (PV) and one storage element [supercapacitor (SC)]. Here, we aimed to provide a management strategy that guarantees optimized bus voltage with arranged power-sharing between the sources. This proposed management aims to provide high-quality energy to the load under different loading conditions with variable solar irradiance, taking into account the FC state. Due to the slow dynamics of the FC, the SC was equipped to supply the transient period. A management algorithm is implemented to hold the DC bus voltage stable against the load variations. The management controller is based on differential flatness approach to generate the references. The DC bus is regulated by the SC energy; to reduce the fluctuations in the DC bus voltage, The PI controller is implemented. This proposed strategy reduces the voltage ripple in the DC bus. Moreover, it provides permanent supplying to the load with smooth behaviour over the sudden changes in the demand as depicted in the simulation results. Our study revealed that this proposed manager can be used for this kind of grids easily.

scholarly journals Adaptive Control of Fuel Cell Converter Based on a New Hamiltonian Energy Function for Stabilizing the DC Bus in DC Microgrid Applications

Mathematics ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 2035 ◽  
Author(s):  
Phatiphat Thounthong ◽  
Pongsiri Mungporn ◽  
Serge Pierfederici ◽  
Damien Guilbert ◽  
Nicu Bizon
Keyword(s):  
Fuel Cell ◽  
Energy Function ◽  
Low Voltage ◽  
Hydrogen Gas ◽  
Hydrogen Fuel Cell ◽  
Dc Microgrid ◽  
Power Load ◽  
Dc Bus ◽  
Bus Voltage ◽  
Multi Phase

DC microgrid applications include electric vehicle systems, shipboard power systems, and More Electric Aircraft (MEA), which produce power at a low voltage level. Rapid developments in hydrogen fuel cell (FC) energy have extended the applications of multi-phase parallel interleaved step-up converters in stabilizing DC bus voltage. The cascade architecture of power converters in DC microgrids may lead to large oscillation and even risks of instability given that the load converters considered as loads feature constant power load (CPL) characteristics. In this article, the output DC bus voltage stabilization and the current sharing of a multi-phase parallel interleaved FC boost converter is presented. The extended Port-Hamiltonian (pH) form has been proposed with the robust controller by adding an integrator action based on the Lyapunov−Energy function, named “Adaptive Hamiltonian PI controller”. The stability and robustness of the designed controller have been estimated by using Mathematica and Matlab/Simulink environments and successfully authenticated by performing experimental results in the laboratory. The results have been obtained using a 2.5 kW prototype FC converter (by two-phase parallel interleaved boost converters) with a dSPACE MicroLabBox platform. The FC main source system is based on a fuel reformer engine that transforms fuel methanol and water into hydrogen gas H2 to a polymer electrolyte membrane FC stack (50 V, 2.5 kW).

A flexible power management strategy for PV-battery based interconnected DC microgrid

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mrutunjaya Panda ◽  
Vijaya Bhaskar Devara ◽  
Surender Reddy Salkuti
Keyword(s):  
Distributed Generation ◽  
Control Strategy ◽  
Power Sharing ◽  
Communication Line ◽  
Dc Microgrid ◽  
Power Management Strategy ◽  
Central Controller ◽  
Dc Bus ◽  
Bus Voltage ◽  
Secondary Power

Abstract In this paper, a coordinated power-sharing strategy for interconnected DC-microgrid (DC-MG) is proposed. The DC-MG consists of two subgrids with an interlinking bidirectional DC/DC converter (IBDDC). Each subgrid has a secondary-1 controller based on a state of charge (SoC) balancing based droop control strategy of the battery unit (BU). The proposed droop strategy regulates the DC bus voltage according to the SoC of BU. With the SoC balancing based droop method, BU with higher SoC supplies more power to the microgrid (MG) as compared to low SoC BU. The SoC information of batteries in all subgrids is communicated through low bandwidth communication (LBC). In case of failure of LBC, a secondary-2 controller is implemented for the battery controller to regulate the DC bus voltage considering the SoC of BU. Secondary-2 does not depend on the communication line. Considering the levels of DC bus voltages, a secondary power regulating controller is introduced for IBDDC. Further, a coordinated power control strategy is proposed for distributed generation to avoid overcharging of batteries. The whole system operates in a distributed way without a central controller. The proposed strategy has been verified in MATLAB/Simulink.

scholarly journals Impact of Information and Communication Technology Limitations on Microgrid Operation

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2926 ◽  
Author(s):  
Mahmoud Saleh ◽  
Yusef Esa ◽  
Mohamed El Hariri ◽  
Ahmed Mohamed
Keyword(s):  
Communication Technology ◽  
Information Communication ◽  
Matlab Simulation ◽  
Dc Microgrid ◽  
Operational Conditions ◽  
Information And Communication ◽  
Dc Bus ◽  
Bus Voltage ◽  
And Control ◽  
The Impact

This paper provides an extensive review of the conducted research regarding various microgrids (MGs) control techniques and the impact of Information Communication Technology (ICT) degradation on MGs performance and control. Additionally, this paper sheds the light on the research gaps and challenges that are to be explored regarding ICT intrinsic-limitations impact on MGs operations and enhancing MGs control. Based on this assessment, it offers future prospects regarding the impact of ICT latencies on MGs and, consequently, on the smart grid. Finally, this paper introduces a case study to show the significance and examine the effect of wireless communication technologies latency on the converters and the DC bus voltage of a centralized controlled DC MG. A DC microgrid with its communication-based control scheme was modeled to achieve this goal. The MATLAB simulation results show that the latency impact may be severe on the converter switches and the DC bus voltage. Additionally, the results show that the latency impact varies depending on the design of the MG and its operational conditions before the latency occurs.

Application of SCES in Improving Dynamic Response of DC Microgrid Bus Voltage

2014 ◽  
Vol 521 ◽  
pp. 431-434
Author(s):  
Yuan Sheng Xiong ◽  
Jian Ming Xu
Keyword(s):  
Dynamic Response ◽  
Feedforward Control ◽  
Dc Microgrid ◽  
Wide Range ◽  
Supercapacitor Energy Storage ◽  
Response Performance ◽  
Dc Bus ◽  
Bus Voltage ◽  
The Stability ◽  
The Impact

To improve the stability of DC bus voltage in DC microgrid, and reduce the impact on microgrid equipments by the DC bus voltage fluctuations, a supercapacitor energy storage (SCES) is designed to connect to the DC bus by the bi-directional converter. The controller is designed by the feedforward control and proportional method with the deadband. The great load disturbance is simulated in PSIM software when the DC microgrid operates in the grid-connected rectification mode. The simulation results show that SCES under the proposed control strategy can reduce the fluctuation range of the DC bus voltage in a wide range of load disturbances, and the dynamic response performance of DC bus voltage is improved.

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