Multi Output Hybrid Solar Inverter with no Right Half Plane Zero and Reduced Common Mode Leakage Current

Abstract

A multi output based transformerless hybrid solar inverter with minimum phase property and reduced common mode leakage current for photovoltaic (PV) based residential microgrid applications is proposed in this article. As two inversely coupled magnetic coils are placed between the input and output sides of the proposed transformerless minimum phase hybrid solar inverter (TLMPHSI), there is no right half plane zero (RHPZ) in control-to-DC output voltage transfer function and it behaves as a minimum phase system. Further, a unipolar based sinusoidal pulse width modulation (SPWM) technique is implemented for the switching operation of the proposed TLMPHSI to minimize the high frequency common mode voltage across the PV to ground parasitic capacitor. Also, it regulates both DC and AC load at the same instant. So, the harmful common mode leakage current is reduced in the system. In addition, as the shoot-through issue is resolved, so the reliability of the proposed TLMPHSI is improved. A 280 W experimental set-up of the proposed TLMPHSI is developed to verify its performance. © 2021 IEEE.