"parallel publishing" - Selaus asiasanan mukaanArtikkelit

    • A class of multi-parametric quadratic program with an uncertain objective function 

      Wei, Wei; Wu, Danman; Wang, Zhaojian; Shafie-khah, Miadreza; Catalão, João P.S. (Elsevier, 12.07.2020)
      article
      In this paper we analyze a class of multi-parametric quadratic program (mpQP) with parameters in the objective function. Except for parameters in coefficients associated with the linear term, the coefficient of the quadratic ...
    • Active and reactive power requirements at DSO-TSO interface : a cases study based on four European countries 

      Kadam, Serdar; Schwalbe, Roman; Übermasser, Stefan; Groiß, Christoph; Einfalt, Alfred; Laaksonen, Hannu; Sirviö, Katja; Hovila, Petri; Blažič, Boštjan (International Conference and Exhibition on Electricity Distribution CIRED, 2018)
      conferenceObject
      The ENTSO-E network code for demand connection sets harmonized requirements for connecting large renewable energy generation units as well as demand response facilities and furthermore reactive power limits which need to ...
    • Active network management scheme for reactive power control 

      Sirviö, Katja; Laaksonen, Hannu; Kauhaniemi, Kimmo (CIRED, 07.06.2018)
      conferenceObject
      In the future new options to provide needed technical ancillary services locally and system-wide by distributed energy resources (DER) are needed. One ancillary service which DER could provide is the reactive power management ...
    • Does calendar time portfolio approach really lack power? 

      Dutta, Anupam (Canadian Center of Science and Education (CCSE), 22.08.2014)
      article
      This paper investigates whether the calendar time methodology lacks power in detecting the long-run abnormalperformance of the firms after major corporate events. In addition, the study proposes a variant of calendar ...
    • Fault type and location detection in islanded microgrid with different control methods based converters 

      Laaksonen, Hannu; Kauhaniemi, Kimmo (CIRED, 21.05.2007)
      conferenceObject
      In this paper the fault type and location detection in an islanded low voltage (LV) distribution network based microgrid with converters applying different control methods is studied. In the ...
    • Light-weight IEC 61850 GOOSE based LoM protection for smart grid 

      Mekkanen, Mike; Kauhaniemi, Kimmo; Kumpulainen, Lauri; Memon, Aushiq (CIRED, 07.06.2018)
      conferenceObject
      This paper presents a novel Loss of Mains (LoM) protection method based on IEC 61850 General Object Oriented Substation Event (GOOSE) protocol. With the increased penetration of distributed generation (DG), the requirements ...
    • Novel protection approach for MV microgrid 

      Voima, Sampo; Kauhaniemi, Kimmo; Laaksonen, Hannu (CIRED, 06.06.2011)
      conferenceObject
      The amount of distributed generation (DG) connected to medium voltage (MV) networks is expected to increase continuously. This trend creates a good opportunity to use MV feeders as microgrids. Normally ...
    • Pricing of IPOs : further evidence from South Africa 

      Dutta, Anupam; Dutta, Probal (Virtus Interpress, 2015)
      article
      We examine the long-term performance of 225 IPOs listed on the Johannesburg Securities Index (JSE) during the period from 1996 to 2006. The buy-and-hold abnormal return (BHAR) method and the calendar time portfolio (CTP) ...
    • Protection system for future LV microgrids 

      Laaksonen, Hannu; Kauhaniemi, Kimmo; Voima, Sampo (CIRED, 06.06.2011)
      conferenceObject
      Traditional protection of low voltage (LV) network will not be applicable for future LV microgrids and new adaptive protection system must be developed. In this paper adaptive protection system for LV microgrid during ...
    • Sensitivity analysis of frequency and voltage stability in islanded microgrid 

      Laaksonen, Hannu; Kauhaniemi, Kimmo (CIRED, 21.05.2007)
      conferenceObject
      This paper studies the voltage and frequency stability of an islanded microgrid and the sensitivity of these quantities to certain changes in system configuration. In conventional power systems the system frequency ...
    • Utilization of a mixture of CTs and current sensors in line differential protection applications 

      Raipala, Ontrei; Hovila, Petri; Leminen, Janne; Farughian, Amir; Memon, Aushiq; Kauhaniemi, Kimmo (CIRED, 03.06.2019)
      conferenceObject
      The popularity of Rogowski sensors is increasing due to their advantages over conventional CTs. Consequently, network utilities may sometimes end up facing a question whether it would be possible to use line differential ...
    • Voltage and current THD in microgrid with different DG unit and load configurations 

      Laaksonen, Hannu; Kauhaniemi, Kimmo (CIRED, 23.06.2008)
      conferenceObject
      After microgrid transition from the normal operation to the islanded operation the system impedance changes considerably and it affects on the harmonic voltages of the microgrid. In this paper the voltage ...