Intelligent DC Microgrid living Laboratories - A Chinese-Danish cooperation project

Rodriguez-Diaz, Enrique; Su, Xiaoling; Savaghebi, Mehdi; Vasquez, Juan C.; Han, Minxiao; Guerrero, Josep M.

doi:10.1109/icdcm.2015.7152070

Cited by 31 publications

(16 citation statements)

References 12 publications

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“…Source side contribution is highly dependent on the converter technology type, either non-isolated or isolated, being used in DC Microgrids [29]. Commonly suggested non-isolated type of converters for LVDC systems are two or three level voltage source converter (VSC), neutral-point-clamped (NPC) converter and modular multi-level converter (MMC) [30][31][32][33]. Short-circuit fault currents in LVDC systems based on VSC interfacing to AC-grid side can be divided into three stages, (1) capacitor discharge stage, (2) diode free-wheeling stage and (3) ac-side contribution stage.…”

Section: Fault Types and Fault Characteristicsmentioning

confidence: 99%

System Configuration, Fault Detection, Location, Isolation and Restoration: A Review on LVDC Microgrid Protections

et al. 2019

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Low voltage direct current (LVDC) distribution has gained the significant interest of research due to the advancements in power conversion technologies. However, the use of converters has given rise to several technical issues regarding their protections and controls of such devices under faulty conditions. Post-fault behaviour of converter-fed LVDC system involves both active converter control and passive circuit transient of similar time scale, which makes the protection for LVDC distribution significantly different and more challenging than low voltage AC. These protection and operational issues have handicapped the practical applications of DC distribution. This paper presents state-of-the-art protection schemes developed for DC Microgrids. With a close look at practical limitations such as the dependency on modelling accuracy, requirement on communications and so forth, a comprehensive evaluation is carried out on those system approaches in terms of system configurations， fault detection, location, isolation and restoration.

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Section: Fault Types and Fault Characteristicsmentioning

confidence: 99%

System Configuration, Fault Detection, Location, Isolation and Restoration: A Review on LVDC Microgrid Protections

et al. 2019

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“…Two-level voltage source converters (VSCs) and neutral point clamped converter (NPC) have already been utilized in a number of existing LVDC projects such as the Finnish LVDC distribution network research site presented in [10], Chinese-Danish DC microgrid cooperation project presented in [11], U.S.A hybrid microgrid test bed presented in [12], and the LVDC test lab in [13].The typical fault characteristics of twolevel VSC and neutral point clamped converter have been previously analysed in details by the authors in [5]. Under faulted condition, these two converters will provide a significant transient and steady state fault currents as shown in Figure 1.…”

Section: A DC Fault Charcterisitcs Of Different Convertersmentioning

confidence: 99%

A novel protection scheme for an LVDC distribution network with reduced fault levels

Wang

Emhemed

Burt

2017

2017 IEEE Second International Conference on DC Microgrids (ICDCM)

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Low Voltage Direct Current (LVDC) distribution is one of the new promising technologies that have the potential to accelerate the wider integration of distributed renewables. However, adding new power electronics to convert AC to DC will introduce new forms of faults with different characteristics. Converters with inherent fault current limiting and blocking capabilities will significantly limit the fault currents, resulting in significant impacts on the performance of existing LV overcurrent protection schemes. New protection methods based on the change in the DC voltages have been proposed recently by different researches. The issue with these methods is that the protection relays of the un-faulted feeders will also see the same change in the voltage for certain faults, leading to substandard selectivity and unnecessary tripping. This paper investigates these challenges, and presents a novel DC protection method which is based on the use of the combination of two components: the voltage change (dv/dt) and the change of current (di/dt). The new method is mainly developed to detect and locate DC faults with reduced fault current levels within DC distribution networks. The introduced protection concept is tested on an LVDC distribution network example using PSCAD/EMTDC simulation tool.

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“…In Aalborg University an Intelligent DC home is being implemented. The Danish Council for Strategic Research on sustainable Energy Environment has granted the project to develop a pioneer facility in Europe, which presumably will boost the research and the involvement of companies and industry for the development of DC technologies for residential applications [11].…”

Section: Prototypes Of DC Homesmentioning

confidence: 99%

Intelligent DC Homes in Future Sustainable Energy Systems: When efficiency and intelligence work together

Rodriguez-Diaz

Vasquez

Guerrero

2016

IEEE Consumer Electron. Mag.

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172

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The evidences that climate change is real, and the fact that it is most likely caused by human-related activities, has made the international community to considered a new energy model. Europe has led the initiative of moving away from fossil fuels to renewable energies, where other powerful countries, as USA and China, are lagging behind, and still highly rely on coal, gas and oil as a source of energy. Europe has set ambitious goals for 2020 regarding the increase of renewable energy production, energy efficiency, and greenhouse gas emission reduction. The concept of a microgrid is perfectly aligned with the new energy strategy. A microgrid easy the integration of renewable energy sources and energy storage systems at the consumption level, aiming to increase power quality, reliability and efficiency. On top of this, the increasing of DC-based loads has reopened the discussion of DC vs AC distribution systems. As a consequence a lot of research has been done on DC distribution systems and its potential for residential applications. Furthermore, the increasing presence and used of smart devices in homes, reveal a promising future for intelligent homes, integrated in the Internet of Things concept, where the residential electrical power systems works in cooperation with the smart devices, in order to achieve a smarter, more sustainable, and cleaner energy systems.

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Intelligent DC Microgrid living Laboratories - A Chinese-Danish cooperation project

Cited by 31 publications

References 12 publications

System Configuration, Fault Detection, Location, Isolation and Restoration: A Review on LVDC Microgrid Protections

System Configuration, Fault Detection, Location, Isolation and Restoration: A Review on LVDC Microgrid Protections

A novel protection scheme for an LVDC distribution network with reduced fault levels

Intelligent DC Homes in Future Sustainable Energy Systems: When efficiency and intelligence work together

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