SIMULATION AND EXPERIMENTAL VALIDATION OF SYMMETRICAL AND ASSYMETRICAL CASCADED H-BRIDGE MULTILEVEL INVERTERS FOR PV APPLICATION
Ramesh A M. Siva Kumar O. Chandra Sekhar
A solar inverter or PV inverter converts the variable direct current (DC) output of a photovoltaic (PV) solar panel into a utility frequency alternating current (AC) that can be fed into a commercial electrical grid or used by a local, off-grid electrical network. It is a critical component in a photovoltaic system, allowing the use of ordinary commercial appliances. Solar inverters have special functions adapted for use with photovoltaic arrays, including maximum power point tracking and anti-islanding protection. This paper deals with symmetrical five level inverter topology along with asymmetrical seven and nine-level inverter topologies for photo-voltaic systems. This paper explains the simplified method to generate gate pulses for the inverter topologies. With this type of simple logic circuit for generation of pulses, the number of snubber circuits becomes less. The number of gate drives will also become less and the control strategy is very easy to implement. The inverter type Hybrid H-Bridge produces greater voltage levels while using less number of switching devices. Reducing the number of switches also reduces switching losses and THD. The results were developed using Matlab/Simulink and these results were validated with hardware comparisons.
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