A survey and extension of high efficiency grid connected transformerless solar inverters with focus on leakage current characteristics

Abstract-Transformerless (TL) topologies are employed in 1φ PV inverter topologies due to their small size and low weight. Avoiding the grid side transformer requires the modulation technique and the basis topology to be accordingly changed in order to mitigate dc current components in the grid side and the leakage current to ground.This paper carries out a sensitivity analysis of selected TL topologies. This analysis investigates the impact of parameter variations of the employed semiconductor devices and detects the device which affects the most the overall efficiency. As a result, relevant info for engineers selecting the most suitable power devices for the implementation of a certain TL topology is provided.

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Section: Introductionsupporting

confidence: 70%

Sensitivity analysis of transformerless PV inverter topologies to physical variations of power devices

Pigazo

Jedtberg

Liserre

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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“…The obtained results in a 3 kW setup show that H6 results in the lowest leakage current (29.4 mA) and the highest efficiency corresponds to paralleled-buck topology (η EU = 97.8 %) follwed by HERIC (η EU = 97.5 %). Similar analyses have been carried out in [23] and [24] and, in all cases, the obtained results, both in simulation and experimentally, are valid for the specifically considered power devices selected for simulation purposes or the implementation of prototypes. The variability of IGBT and diode parameters due to the employed technology and the characteristics of the manufacturing process is considered in [25], where a statistical approach for performance evaluation of transformer-based H4 topology is proposed.…”

Section: Introductionsupporting

confidence: 62%

Analysis of the Robustness of Transformerless PV Inverter Topologies to the Choice of Power Devices

Jedtberg

Pigazo

Liserre

et al. 2017

IEEE Trans. Power Electron.

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“…The obtained results show that HERIC topology results in a higher efficiency (96.05 %) and the lowest leakage current corresponds to HBZVR-D (42.7 mA). Similar analyses have been carried out in [8] and [9] and, in all cases, the obtained results, both in simulation and experimentally, correspond to some power devices selected for simulation purposes or the implementation of prototypes. This work considers the approach shown in [10], where a statistical approach is proposed for evaluation of the H4 topology and selection of the most suitable power devices for its implementation in 1φ PV inverters.…”

Section: Introductionsupporting

confidence: 55%

Robustness evaluation of transformerless PV inverter topologies

Jedtberg

Pigazo

Liserre

2014

2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Abstract-Transformerless PV inverter topologies allow the PV inverter size and weight to be reduced while reaching a higher efficiency. The drawbacks of these topologies are that DC current components at the grid side must be cancelled by means of the employed controller and the number of power devices required to avoid currents through the parasitic capacitor of the PV generator increases.These topologies have been analysed in the literature but physical variations of power devices due to the manufacturing process have not been taken into account. This manuscript analyses the effect of such physical variations on the performance of three commonly employed transformerless topologies: H5, HERIC and Half-Bridge NPC. The impact of the parameter variations is compared regarding the efficiencies at different power levels, the European Efficiency and the DC current components. The results indicate that physical variations lead to different behaviors regarding the robustness of the analysed topologies. By means of statistical analyses these differences are obtained and exposed.

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A survey and extension of high efficiency grid connected transformerless solar inverters with focus on leakage current characteristics

Cited by 40 publications

References 8 publications

Sensitivity analysis of transformerless PV inverter topologies to physical variations of power devices

Sensitivity analysis of transformerless PV inverter topologies to physical variations of power devices

Analysis of the Robustness of Transformerless PV Inverter Topologies to the Choice of Power Devices

Robustness evaluation of transformerless PV inverter topologies

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