1. Power System DepartmentChina Electric Power Research InstituteNo 15. Xiaoying East Road, 100192 QingheBeijngPeople's Republic of China
2. Electrical Engineering DepartmentCITCEA‐UPCTechnical University of CataloniaDiagonal 647 Planta 2BarcelonaSpain
3. Electrical Engineering AreaCatalonia Institute for Energy Research (IREC)Jardins de Dones de Negre 1, 08963 Sant Adrià de BesòsBarcelonaSpain
4. Electrical Engineering DepartmentTechnical University of CataloniaDiagonal 647 Planta 2BarcelonaSpain