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Review: Grid-Connected Inverter with Its Filter and Providing Suggestions for Designing a Transformerless Inverter

A. Algaddafi 1, K. Elnaddab 2, and M. Khoja 3
1. Electrical and Electronic Engineering, Sirte University, Sirte, Libya
2. School of Engineering, Cardiff University, CF24 3AA, Cardiff, UK
3. Institute of Energy and Sustainable, De Montfort University, LE1 9BH, Leicester, UK

Abstract—The grid-connected inverter is the interconnect between a renewable energy source such as the wind and solar power and the grid. There are two types of the grid-connected inverter based on the transformer. These are called the transformerless inverter and isolated inverter. The former is a smaller size and weight; however, the one limitation of this inverter is a leakage current problem. The latter has the advantage of being applicable in isolated locations, but it suffers from high cost and significant weight. In general, the grid-connected inverter has required a filter to mitigate the harmonic components and produce a perfect sinusoidal waveform. But this filter should be properly selected, whether the L filter or LCL filter. This paper reviews the previous studies on the grid-connected inverter and highlights the limitations from the literature’s point of view. Finally, suggestions and recommendations for designing the filter and an optimal control for the grid-connected inverter are presented with extensive and in-depth detail.

Index Terms—grid-connected inverter, integration of energy storage systems, Maximum Power Point Tracking (MPPT)

Cite: A. Algaddafi, K. Elnaddab, and M. Khoja, "Review: Grid-Connected Inverter with Its Filter and Providing Suggestions for Designing a Transformerless Inverter," International Journal of Electrical Energy, Vol. 4, No. 3, pp. 174-178, September 2016. doi: 10.18178/ijoee.4.3.174-178


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