HP Induction Starter/ Generator Gas Turbine LP Spool LP Induction Generator Gas Turbine HP Spool Active Rectifier Unit Active Rectifier Unit 115-Vac Distribution ±270-Vdc Distribution Auto Transformer Unit dc/dc Converter Unit 230-Vac Distribution 28-Vdc Bus Figure 3. The system configuration of the induction generator-based ac/dc hybrid generation system. HP Spool Generation Subsystem OEWIS/G On HP Spool IRU ea Ls ia uab eb Ls Rs ib vab ubc ec Ls Rs ic vbc Rs Current Feedback CVVF ac Loads ac Voltage Feedback dc Voltage Feedback Controller 1 dc Power Command Controller 2 Current Feedback ea Ls Rs ia eb Ls Rs ib Rs ic ec Ls vab vdc vbc C CV dc Loads Active Rectifier Unit Wye-Connected Induction Generator On LP Spool LP Spool Generation Subsystem Figure 4. An electrical system diagram of the induction generator-based ac/dc hybrid generation system. IEEE Elec trific ation Magazine / D EC EM BE R 2 0 1 7 29