1) How is the real power controlled in a grid-connected windturbine employing a permanent-magnet synchronous generator (PMSG)with rectifier and inverter? *
| rotational speed |
| inverter output current |
| generator output voltage |
| rectifier output voltage |
| inverter output voltage |
2) How do you compare the size of power electronics in agrid-connected 1 MW variable-speed wind turbine employing DFIG andPMSG? *
| same |
| no power electronics in DFIG |
| no power electronics in PMSG |
| smaller in PMSG |
| smaller in DFIG |
3)What is the real power flow in a grid-connected wind turbineemploying a 4-pole doubly-fed induction generator (DFIG) if thegenerator rotational speed is 1580 rpm? *
| power grid --> stator, rotor --> power grid |
| power grid --> stator, power grid --> rotor |
| stator --> power grid, power grid --> rotor |
| stator --> power grid, rotor --> power grid |
| stator --> power grid, no rotor power |
4) What is the azimuth angle at solar noon in a place located at40^o N and 30^o E for March 21, 2020? *
5)What is the altitude angle at sunset in a place located at40^o N and 30^o E for March 21, 2020? *
