Global Energy Interconnection Group Co.Ltd. Ethiopia Branch 1000 Addis Ababa Ethiopia;
State Grid Energy Research Institute Co.Ltd. Beijing 102209 P.R.China;
North China Electric Power University Beijing 102206 P.R.China;
State Grid Energy Research Institute Co.Ltd. Beijing 102209 P.R.China;
North China Electric Power University Beijing 102206 P.R.China;