Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

LCI

Load commutated inverters”, also known as “current source inverters” (CSIs) were, for many years,common in industrial applications where squirrel cage induction motors (rated 600HP/450 kW andabove); for example: centrifugal pumps and fan loads where high starting torque is not needed.However, their use has diminished due to availability of the less expensive and physically smaller ACPWM drives.The load commutated inverter (LCI), so called due to the fact that the motor current commutates theinverter bridge (i.e., it facilitates transfer of current from one phase to another). It is characterized bya large inductor included in the DC bus, as depicted in Section 4, Figure 41, below. Loadcommutated inverters are known as “constant current” drives due to the action of the large DC businductor (i.e., it has an “inductive DC bus”), whereas AC PWM drives have a “capacitive DC bus”,due to the presence of the large capacitor bank

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