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This paper presents investigation of a new Phase shifted PWM technique with improved harmonic suppression. A novel balance circuit for DC - link voltage balance of two three level legs connected back - to back is designed and tested. Combined with the individual voltage control, a complete voltage controller is developed for a cascaded nine level hybrid model with two cells. Robustness of the proposed...
A lot of research has been done on balancing of DC capacitor voltage for multilevel converter with little success in converters with higher levels (more than five). Under normal operating conditions, the average DC capacitor can be controlled by slightly shifting sinusoidal modulating waves of phase shifted hybrid PWM technique, however this cannot be easily realized during transient operation or...
The output voltage and current of renewable energy sources such as Photo- voltaic are not controlled. Consequently PV- Grid interface system is employed condition output voltage and current into the grid. This call for efficient and well designed control strategies to ensure reliability, stability and quality power output. This paper proposes nine- level cascaded NPC/H-bridge inverter as the PV- Grid...
Multilevel topologies have emerged as a viable technique for medium and high voltage inverters but in the low voltage range they have failed to attract much interest due to their increased cost associated with the additional components and complicated control. This paper proposes a new and simplified control strategy for a nine-cascaded neutral-point -clamped (NPC)/H-bridge PWM inverter. The new control...
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