A SINGLE PHASE TRANSFORMERLESS INVERTER WITH CHARGE PUMP CIRCUIT CONCSEPT FOR GRID – TIED PV APPLICATION

Author (s) : Hakeem sultan sait, Liyas basha, kokilavani,Ramya

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Abstract :
This project proposes a new single phase transformerless Photovoltaic (PV) inverter for grid tied PV systems. The topology is derived from the concept of a charge pump circuit in order to eliminate the leakage current. It is composed of four power switches, two diodes, two capacitors and an LCL output filter. The neutral of the grid is directly connected to the negative polarity of the PV panel that creates a constant Common Mode (CM) voltage and zero leakage current. The charge pump circuit generates the negative output voltage of the proposed inverter during the negative cycle. A Proportional Resonant (PR) control strategy is used to control the injected current. The main benefits of the proposed inverter are The neutral of the grid is directly connected to the negative terminal of the PV panel, so the leakage current is eliminated, its compact size, low cost, grid tied PV the used dc voltage of the proposed inverter is the same as the Full Bridge (FB) inverter (unlike Neutral Point Clamped (NPC), Active NPC (ANPC), and Half Bridge (HB) inverters) flexible grounding configuration capability of reactive power flow, and high efficiency. A complete description of the operating principle and analysis of the proposed inverter are presented Experimental results are presented to confirm both the theoretical analysis and the concept of the proposed inverter. The obtained results clearly validate the performance of the proposed inverter and its practical application in systems.

Keywords : Photovoltaic, Proportional Resonant (PR) control strategy, Neutral Point Clamped, Active NPC, Inverter

Conference Date : 30/08/2019

Pages : 220

Paper ID : 19211