FEUP - Faculty of Engineering, University of Porto, Porto, Portugal and INESC Porto, Power Systems Unit, Porto, Portugal;FEUP - Faculty of Engineering, University of Porto, Porto, Portugal and INESC Porto, Power Systems Unit, Porto, Portugal;FEUP - Faculty of Engineering, University of Porto, Porto, Portugal and INESC Porto, Power Systems Unit, Porto, Portugal;FEUP - Faculty of Engineering, University of Porto, Porto, Portugal and INESC Porto, Power Systems Unit, Porto, Portugal;FEUP - Faculty of Engineering, University of Porto, Porto, Portugal and INESC Porto, Power Systems Unit, Porto, Portugal;FEUP - Faculty of Engineering, University of Porto, Porto, Portugal and INESC Porto, Power Systems Unit, Porto, Portugal;FEUP - Faculty of Engineering, University of Porto, Porto, Portugal and INESC Porto, Power Systems Unit, Porto, Portugal;FEP - Faculty of Economics, University of Porto, Porto, Portugal and INESC Porto, Power Systems Unit, Porto, Portugal;INESC Porto, Power Systems Unit, Porto, Portugal;INESC Porto, Power Systems Unit, Porto, Portugal