An Improved Grid Connected Transformerless Inverter with Proportional Resonant Controller
Subject Areas : electrical and computer engineeringJ. Fallah Ardashir 1 , M. Sabahi 2 , S. H. Hosseini 3 , E. Babaei 4 , G. Gharehpetian 5
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Keywords: Transformerless inverter leakage current ommon mode voltage proportional resonant controller,
Abstract :
The grid tied PV systems without transformer have some benefits such as low cost, weight and size and also increases the overall efficiency. The galvanic connection between the grid and PV system causes leakage current in the transformerless inverter to flow through parasitic capacitors between the PV system and ground and causes personal safety problems, increases the output harmonic spectrum, and system losses. This paper introduces a modified single phase two stage transformerless inverter for grid connected photovoltaic systems with low leakage current. The neutral of the grid is directly connected to the negative terminal of PV panel that eliminates leakage current without complex control strategy. In this paper, a Proportional Resonant (PR) control strategy is used to control the injected current. The performance of the transformerless inverter is analyzed and its structure has been simulated in PSCAD/EMTDC and the obtained results tested experimentally.
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