Modeling and Control of the Distributed Power Converters in a Standalone DC Microgrid

Lü, Xiaodong; Wan, Jiangwen

doi:10.3390/en9030217

Cited by 16 publications

(13 citation statements)

References 18 publications

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“…The ESS integration with the DC-bus is performed using bidirectional converters and control strategies [23,24] to regulate the DC-bus voltage and to guarantee the global power balance in the standalone MG when excess or shortage power exists. However, additional conditions can also be considered; for example, a limitation to the power generated by the PVS [25][26][27], which is applied when the ESS reaches the maximum state of charge (SOC) during low power demand, or a load disconnection when the ESS reaches the minimum SOC during high power demand [25,28]. Those protections are needed to prevent an accelerated reduction of the ESS lifetime [29][30][31], hence reducing costs.…”

Section: Introductionmentioning

confidence: 99%

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

et al. 2020

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Stand-alone Electrical microgrids (MGs) require power management strategies to extend the life-time of their devices and to guarantee the global power balance of non-critical loads such as lighting of small sections of an university campus or individual air conditioning systems. This paper proposes an energy management strategy (EMS) for an isolated DC microgrid formed by a photovoltaic system (PVS), an energy storage system (battery), and a noncritical load. This configuration enables the photovoltaic system to control the power generation and ensures that the storage element does not exceed the safe limits of the state of charge. To control the generation of the photovoltaic system, two operating modes based on the perturb and observe (P&O) algorithm are implemented. The first one performs a maximum power point tracking (MPPT) action, while the second one regulates the power generated by the PVS to match the load requirement (power demand tracking, PDT). The management strategy also considers different operating states for ensuring the battery safety: normal operation, overcharge (at the maximum state of charge), and bulk charge (at the minimum state of charge); in those states the disconnection/connection of both the battery and the load is also considered. The main contribution of this work is to design and test a control strategy for an EMS aimed at regulating a standalone microgrid based on a PV system and an energy storage device. This solution is validated using detailed MG circuital simulations, which includes the PV source model (single-diode model), lithium-ion battery model, constant power load model and the DC/DC converters equations; moreover, realistic power generation and demand from Universidad Nacional de Colombia, located at Medellín-Colombia, are considered. The results obtained demonstrate the effectiveness of the energy management strategy, and in this way, enable to extend the battery lifetime and reduce the costs associated to the maintenance and disconnection of the microgrid in educational buildings or other applications focused on this type of DC microgrid.

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Section: Introductionmentioning

confidence: 99%

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

et al. 2020

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“…Obviously, it is ideal to power DC loads with DC supply. Moreover, DC system has the advantages to cope with inherent problems related to AC system, such as synchronization of the distributed generators, three-phase unbalances, inrush currents, reactive-power flow, harmonic currents [4]. Nowadays DC microgrids are found in many places and the development technologies of future intelligent DC microgrids are also being deployed for highly efficient integration of distributed generation and modern electronic loads [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Economic Power Schedule and Transactive Energy through Intelligent Centralized Energy Management System for DC Residential Distribution System

Yue¹,

Hu²,

Li³

et al. 2017

Preprint

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DC residential distribution system (RDS) consisted by DC living home will be a significant integral part in the future green transmission. Meanwhile, the increasing number of distributed resources and intelligent devices will change the power flow between main grid and demand sides. The utilization of distributed generations (DGs) requires an economic operation, stability, environmentally friendly in the whole DC system. This paper not only presents an optimization schedule and transactive energy (TE) approach through centralized energy management system (CEMS), but a control approach to implement and ensure DG output voltages to various DC buses in DC RDS. Based on data collection, prediction and a certain objection, the expert system in CEMS can work out the optimization schedule, after this, the voltage droop control for steady voltage is aligned with the command of unit power schedule. In this work, a DC RDS is as a case study to demonstrate the process, the RDS is associated with unit economic models, cost minimization objective is proposed to achieve based on real-time electrical price. The results show that the proposed framework and methods will help the targeted DC residential system to reduce the total cost and reach stability and efficiency.

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“…Due to the increasing penetration of renewable distributed generation units, such as photovoltaic and wind generators, the technical idea of micro-grids has been suggested to make full use of DG [1][2][3][4][5][6]. In addition, considering the rapid development of computer and digital communication technologies [7][8][9][10][11][12][13], the micro-grids may play a crucial role in the future energy internet.…”

Section: Introductionmentioning

confidence: 99%

Technical Evaluation of Superconducting Fault Current Limiters Used in a Micro-Grid by Considering the Fault Characteristics of Distributed Generation, Energy Storage and Power Loads

Chen

et al. 2016

Energies

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Abstract:Concerning the development of a micro-grid integrated with multiple intermittent renewable energy resources, one of the main issues is related to the improvement of its robustness against short-circuit faults. In a sense, the superconducting fault current limiter (SFCL) can be regarded as a feasible approach to enhance the transient performance of a micro-grid under fault conditions. In this paper, the fault transient analysis of a micro-grid, including distributed generation, energy storage and power loads, is conducted, and regarding the application of one or more flux-coupling-type SFCLs in the micro-grid, an integrated technical evaluation method considering current-limiting performance, bus voltage stability and device cost is proposed. In order to assess the performance of the SFCLs and verify the effectiveness of the evaluation method, different fault cases of a 10-kV micro-grid with photovoltaic (PV), wind generator and energy storage are simulated in the MATLAB software. The results show that, the efficient use of the SFCLs for the micro-grid can contribute to reducing the fault current, improving the voltage sags and suppressing the frequency fluctuations. Moreover, there will be a compromise design to fully take advantage of the SFCL parameters, and thus, the transient performance of the micro-grid can be guaranteed.

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Modeling and Control of the Distributed Power Converters in a Standalone DC Microgrid

Cited by 16 publications

References 18 publications

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

Economic Power Schedule and Transactive Energy through Intelligent Centralized Energy Management System for DC Residential Distribution System

Technical Evaluation of Superconducting Fault Current Limiters Used in a Micro-Grid by Considering the Fault Characteristics of Distributed Generation, Energy Storage and Power Loads

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