A Single Phase DC DC Microinverter with High efficiency and Harmonics Reduction using Passive Filters

TL;DR

This paper investigates a single-phase DC-DC microinverter with high efficiency and reduced harmonics, analyzing the impact of different passive filters on performance and THD, demonstrating that LCL filters improve harmonic reduction.

Contribution

It introduces a microinverter design with passive filters and compares the effects of CL and LCL filters on efficiency and harmonic distortion, showing LCL filters offer better harmonic reduction.

Findings

LCL filters reduce THD by 1% compared to CL filters.

Both filters achieve THD below 5%, meeting IEEE standards.

LCL filter improves harmonic performance without significantly compromising efficiency.

Abstract

The photovoltaic microinverter based two-switch DC-DC flyback converters has been investigated. The microinverter is characterized by the high performance and simple design. The effect of CL and LCL low pass filter on Total Harmonics Distortion (THD) of microinverter have been investigated. The results were found for the cases when CL and LCL output low pass filters were applied. The obtained results show that the efficiency and THD of the investigated photovoltaic microinverter based on the LCL output low pass filter is lower as compared to the case when the LC output low pass filter is utilized. The THD of microinverter with both output low pass filters is less than 5% respect the requirement of IEEE 1574-2014. Further, the LCL output low pass filter is used the THD decreases by 1% compared to the CL low pass filter.