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Project Zone > Electrical > Power Electronics

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Hybrid multicarrier modulation to reduce leakage current in a transformer less cascaded multilevel inverter for photovoltaic systems

Category : Power Electronics


Sub Category : DC TO AC CONVERTERS (INVERTERS)


Project Code : ITPW22


Project Abstract

This letter proposes a hybrid multicarrier pulse width modulation (H-MCPWM) technique to reduce leakage current in a transformerless cascaded multilevel inverter for photovoltaic (PV) systems. The transformerless PV inverter topology has the advantages of simple structure, low weight and provides higher efficiency. However, the topology makes a path for leakage current to flow through parasitic capacitance formed between the PV module and the ground. A modulation technique has significant impact to reduce the leakage current without adding any extra component. The proposedH-MCPWMtechnique ensures low leakage current in the transformerless PV inverter system with simplicity in implementation of the modulation technique using lesser number of carriers. Experimental prototype developed in the laboratory demonstrates the performance of the proposed modulation technique in reducing the leakage current.

                  PROPOSED SYSTEM        

EXISTING SYSTEM

The valley-fill circuit is simple and does not need to be integrated with the inverter stage to minimize the size and cost of the overall ballast circuit.

A major drawback of the aforementioned ballast circuit configuration is that the presence of the large dc-link capacitor which results in poor input power factor.

High efficiency

Low efficiency

Transformer is used. (coupled inductor)

Transformer is not used.

Power losses is low

Power losses is high

Low  switching losses.

High switching losses.

Low temperature in the components

High  temperature in the components

Harmonics low

HIGH harmonics
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