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  • 1.
    Saeedian, Meysam
    et al.
    Aalto University, Espoo, Finland.
    Pouresmaeil, Edris
    Aalto University, Espoo, Finland.
    Samadaei, Emad
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Godinho Rodrigues, Eduardo Manuel
    Management and Production Technologies of Northern Aveiro—ESAN, Oliveira de Azeméis, Portugal.
    Godina, Radu
    New University of Lisbon, Caparica, Portugal.
    Marzband, Mousa
    Northumbria University, Newcastle upon Tyne, UK.
    An innovative dual-boost nine-level inverter with low-voltage rating switches2019In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 2, article id 207Article in journal (Refereed)
    Abstract [en]

    This article presents an innovative switched-capacitor based nine-level inverter employing single DC input for renewable and sustainable energy applications. The proposed configuration generates a step-up bipolar output voltage without end-side H-bridge, and the employed capacitors are charged in a self-balancing form. Applying low-voltage rated switches is another merit of the proposed inverter, which leads to extensive reduction in total standing voltage. Thereby, switching losses as well as inverter cost are reduced proportionally. Furthermore, the comparative analysis against other state-of-the-art inverters depicts that the number of required power electronic devices and implementation cost is reduced in the proposed structure. The working principle of the proposed circuit along with its efficiency calculations and thermal modeling are elaborated in detail. In the end, simulations and experimental tests are conducted to validate the flawless performance of the proposed nine-level topology in power systems.

  • 2.
    Zhang, Wennan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    He, Jie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Engstrand, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Björkqvist, Olof
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Economic evaluation on bio-synthetic natural gas production integrated in a thermomechanical pulp mill2015In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 8, no 11, p. 12795-12809Article in journal (Refereed)
    Abstract [en]

    In this study, biorefinery as a concept is applied to thermomechanical pulp (TMP)-based paper production to evaluate the possibility of co-production of synthetic natural gas (SNG), electricity and district heating in addition to mechanical pulp and paper. The combined heat and power plant (CHP) associated to TMP is replaced by a biomass-to-SNG (BtSNG) plant. Implementing BtSNG in a mechanical pulp production line might improve the profitability of a TMP mill and also help to commercialize the BtSNG technology by taking into account of some key issues such as biomass availability, heat utilization, etc. A TMP + BtSNG mathematical model is developed with ASPEN Plus. The model prediction shows that the scale of the TMP + BtSNG mill and SNG price are two strong factors for the implementation of BtSNG in a TMP mill. A BtSNG plant associated to a TMP mill should be built at a scale above 100 MW of biomass thermal input. For the case of Swedish economic condition, commercialization of SNG production as a transport biofuel has not matured yet. Political instruments to support commercialization of transport biofuel are necessary.

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