1. SECOMUCI Research Group, Department of Electric, Systems and Automatics Engineering, Universidad de León, León, Spain
2. Department of Electric, Systems and Automatics Engineering, Universidad de León, León, Spain
3. Universidad Carlos III de Madrid, Madrid, Spain
4. SALBIS Research Group, Department of Electric, Systems and Automatics Engineering, Universidad de León, León, Spain
5. TRESCA Ingeniería S.A., León, Spain