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  • 1.
    Sahoo, Smruti
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Xin, Zhao
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Kyprianidis, Konstantinos
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    A review of concepts, benefits, and challenges for future electrical propulsion-based aircraft2020In: Aerospace, ISSN 2226-4310, Vol. 7, no 4, p. 1-69, article id 44Article, review/survey (Refereed)
    Abstract [en]

    Electrification of the propulsion system has opened the door to a new paradigm of propulsion system configurations and novel aircraft designs, which was never envisioned before. Despite lofty promises, the concept must overcome the design and sizing challenges to make it realizable. A suitable modeling framework is desired in order to explore the design space at the conceptual level. A greater investment in enabling technologies, and infrastructural developments, is expected to facilitate its successful application in the market. In this review paper, several scholarly articles were surveyed to get an insight into the current landscape of research endeavors and the formulated derivations related to electric aircraft developments. The barriers and the needed future technological development paths are discussed. The paper also includes detailed assessments of the implications and other needs pertaining to future technology, regulation, certification, and infrastructure developments, in order to make the next generation electric aircraft operation commercially worthy.

  • 2.
    Sahoo, Smruti
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Xin, Zhao
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Kyprianidis, Konstantinos
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Kalfas, A.
    Aristotle University of Thessaloniki, Thessaloniki, Greece.
    Performance assessment of an integrated parallel hybrid-electric propulsion system aircraft2019In: Proceedings of the ASME Turbo Expo, American Society of Mechanical Engineers (ASME) , 2019, Vol. 3Conference paper (Refereed)
    Abstract [en]

    Hybrid-electric propulsion system promises avenues for a greener aviation sector. Ground research work was performed in the past for the feasibility assessment, at the system level, for such novel concepts and the results showed were promising. Such designs, however, possess unique challenges from an operational point of view, and for sizing of the sub-system components; necessitating further design space exploration for associating with an optimal operational strategy. In light of the above, the paper aims at presenting an operational analysis and performance assessment study, for a conceptualised parallel hybrid design of an advanced geared turbofan engine, based on 2035 timeframe technology level. It is identified that the hybrid power operation of the engine is constrained with respect to the requirement of maintaining an adequate surge margin for the low pressure side components; however, a core re-optimised engine design with consideration of electrical power add-in for the design condition, relieves such limit. Therefore such a design, makes it suitable for implementation of higher degree of hybridisation. Furthermore, performance assessment is made both at engine and engine-aircraft integrated level for both scenarios of hybrid operation and the benefits are established relative to the baseline engine. The performance at engine level engine specific fuel consumption (SFC), thrust specific power consumption (TSPC), and overall efficiency, shows improvement in both hybridised scenarios. Improvement in SFC is achieved due to supply of the electrical power, whereas, the boost in TSPC, and overall efficiency is attributed to the use of higher efficiency electrical drive system. Furthermore, it is observed that while the hybridised scenario performs better at engine level, the core re-optimised design exhibits a better saving for block fuel/energy consumption, due to the considerable weight savings in the core components.

  • 3.
    Sahoo, Smrutirekha
    Mälardalen University, School of Business, Society and Engineering.
    Impact Study: Photo-voltaic Distributed Generation on Power System2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The grid-connected photo-voltaic (PV) system is one of the most promising renewable energy solutions which offers many benefits to both the end user and the utility network and thus it has gained the popularity over the last few decades. However, due to the very nature of its invariability and weather dependencies, the large scale integration of this type of distributed generation has created challenges for the network operator while maintaining the quality of the power supply and also for reliable and safe operations of the grids. In this study, the behavioral impact of large scale PV system integration which are both steady and dynamic in nature was studied.  An aggregate PV model suited to study the impacts was built using MATLAB/Simulink.  The integration impacts of PV power to existing grids were studied with focus on the low voltage residential distribution grids of Mälarenergi Elnät AB (10/0.4 kV). The steady state impacts were related to voltage profile, network loss. It was found that the PV generation at the load end undisputedly improves the voltage profile of the grid especially for the load buses which are situated at farther end of the grid. Further, with regard to the overvoltage issue, which is generally a concern during the low load demand period it was concluded that, at a 50% PV penetration level, the voltage level for the load buses is within the limit of 103% as prescribed by the regulator excepting for few load buses. The voltage level for load buses which deviate from the regulatory requirement are located at distance of 1200 meter or further away from the substation. The dynamic impact studied were for voltage unbalancing in the grid, which was found to have greater impact at the load buses which is located farther compared to a bus located nearer to the substation. With respect to impact study related to introduction of harmonics to the grid due to PV system integration, it was found that amount of harmonic content which was measured as total harmonic distortion (THD) multiplies with integration of more number of PV system. For a 50 % penetration level of PV, the introduced harmonics into the representative network is very minimal. Also, it was observed from the simulation study that THD content are be less when the grid operates at low load condition with high solar irradiance compared to lower irradiance and high load condition. 

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  • 4.
    Stridh, Bengt
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. ABB Corporate Research, Sweden.
    Rosenlind, Johanna
    Mälarenergi, Sweden.
    Bagge, Patrik
    Mälarenergi, Sweden.
    Sahoo, Smruti
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Zetterström, Patrik
    Uppsala University, Sweden.
    Power quality experiences from Sweden's first MW photovoltaics park and impact on LV planning2016In: IEEE ISGT 2016: Innovative Smart Grid Technologies, 2016Conference paper (Refereed)
    Abstract [en]

    The first 1 MW PV park in Sweden was installed in 2014. A concern from the grid owner perspective is how the growing number of PV installations will influence the power quality in their grids. The power quality impact from the 1 MW park was demonstrated to fall within the regulating limitations in EIFS 2013:1 for the following aspects: voltage changes, voltage harmonics, interharmonics, and voltage unbalance. However, the slow voltage variations were exceeding the Swedish industry recommendations (AMP) governing a single production source. This deviation occurred during 0.74% of the studied two-month period. To meet AMP recommendations it would have been necessary to install a separate cable intended only for the solar park itself and connected closer to the substation. Perhaps a more appropriate alternative would have been to connect the solar park on the closest 20 kV grid.

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