PEREC Load commutation T TT R iV TT b 4 Condition Load current is leading load voltage 4 Application: capacitive load, synchronous motor
Power E l ect r o n cs i 6 Load commutation Load commutation Condition: Load current is leading load voltage Condition: Load current is leading load voltage Application: capacitive load, synchronous motor Application: capacitive load, synchronous motor
Forced commutation (capacitance commutation C VT △w a Direct-Coupled With Coupling- Inductor 7
Power E l ect r o n cs i 7 Forced commutation Forced commutation (capacitance commutation) (capacitance commutation) Direct-Coupled Coupled With Coupling With Coupling-Inductor Inductor
PEREC Another classification of commutations 4 types of Commutations Device commutation For fully-controlled devices Self-commutation Forced commutation Line commutation or thyristors External commutation Load commutation
Power Electron cs i 8 Another classification of commutations Another classification of commutations Self-commutation commutation Device commutation Forced commutation Line commutation Load commutation 4 types of Commutations types of Commutations For fully-con trolled devices For thyristors External External commutation commutation
PEREC 2 classes of inverters Voltage Source Inverter Current Source Inverter S|) (CS|) + 长本V1+本W2 ⅥT1W C VVT C R lo L R D D T 2
Power Electron cs i 9 2 classes of inverters classes of inverters Voltage Source Inverter (VSI) Current Source Inverter (CSI)