| Abstract |
To attain the high power rating for industrial speed drive systems, the multilevel Capacitor –
Clamping- Inverters are particularly well suited for high voltage, high power squirrel cage induction
motors. In the imprecated cells multilevel inverter, the power semiconductors are protected from overvoltages,
by clamping action of DC supply of the flying-capacitors. The analysis of a complete state
space description of the system shows that, if the load is pure inductive, the self-balancing phenomena
is not accomplished under the conventional sub-harmonic PWM. An appropriate multilevel PWM
control has been developed as feedback of each capacitor voltage error, to overcome the dynamic
unbalance due to inverter input DC link voltage fluctuation or fast load variation. A simulation results
are carried out from Matlab-Simulink circuit simulation. The implementation of this strategy has been
done in Field Programmed Gate Array circuit. |
