Design and Implementation of Leakage Current Minimization Technique for Single phase Grid Connected Transformer-less PV Inverter


Author (s):

  1. A. Arrul Dhana Mathy, SSN College of Engineering, Chennai, Tamilnadu, India
  2. R. Ramaprabha, SSN College of Engineering, Chennai, Tamilnadu, India, ramaprabhar@ssn.edu.in

Abstract:

Leakage current is an important parameter to be considered in grid connected transformer-less photovoltaic (PV) inverter. This paper presents a comparative study of H5 topology of transformer-less inverter which employs galvanic isolation technique (dc-decoupling) and H-bridge zero voltage state rectifier (HBZVR) topology of transformer-less inverter which combines both galvanic isolation technique (ac decoupling) and common mode voltage clamping (CMV). The sine carrier pulse width modulation (SPWM) is applied. By using SPWM, the total harmonic distortion can be reduced and higher fundamental voltage is obtained with reduced filter size.Leakage current, CMV, output voltage and current of both topologiesare compared in this paper. It is found that the performance of HBZVR is superior to H5 topology.

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