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Traditional voltage source inverter (VSI) used to drive a three phase induction motor (IM) is a two level inverter. Various control techniques are employed to improve the DC-link utilization and to reduce the DC-link voltage. Lower DC-link voltage reduces the voltage stress across active switches and passive elements, thereby increasing the inverter reliability. Multi-level inverters are used in medium...
Traditional 2-level voltage source inverter (VSI) based active power filters (APF) has a high DC voltage across the capacitor. A pure APF connected to a 3-ϕ 400V line voltage, will have a DC voltage of more than 600V for its effective working. Active switches in the inverter subjected to this voltage, results in a high voltage stress. Multi-level inverter topology in APF reduces the voltage stress...
Pulse width modulated voltage source inverters (PWM-VSI) have many advantages over the traditional bridge inverters; yet there are some challenges encountered by PWM inverters. As power and voltage rating increases; device constraint as well ashigh switching loss creates serious problems. Various pulse width modulated strategies like sinusoidal; 3rd harmonic injection and space vector PWM (SVPWM)...
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