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Enhanced power quality PV-inverter with leakage current suppression for three-phase SECS

Vedantham, Lakshmi Srinivas ORCID: https://orcid.org/0000-0002-6376-8602, Singh, Bhim and Mishra, Sukumar 2022. Enhanced power quality PV-inverter with leakage current suppression for three-phase SECS. IEEE Transactions on Industrial Electronics 69 (6) , pp. 5756-5767. 10.1109/TIE.2021.3090698

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Abstract

This paper presents an enhanced power quality solar-photovoltaic inverter enabling common-mode leakage current elimination. A three-phase transformer-less solar energy conversion system (SECS) is considered here, which, along with peak active-power production from PV-array, ensures different power quality improvement capabilities such as grid current harmonics mitigation, grid-currents balancing, while also offering the grid reactive power support. Unlike conventional power quality inverters, this strategy is a robust with respect to abnormalities in grid-voltages at far radial ends, and does not compromise with the leakage currents caused by parasitic-capacitance of PV-array with ground. Common practice in the PV inverter power quality control is to neglect the PV leakage-currents, however, they considerably affect the system performance by deteriorating the power quality and causing the safety issues of operating personnel. The standards VDE-00126 and NB/T-32004, therefore, compel the transformer-less PV-systems to operate with leakage current under 300mA range. Various simulation and test results show the satisfactory performance of the presented strategy, even under various grid-side abnormalities. The comparative analysis with state-of-art techniques shows the effectiveness of the strategy. Under all test conditions, the harmonics in grid-currents are observed within limits as per the IEEE-519 and IEC-61727 standards, while the PV leakage-currents are maintained well within the range recommended by VDE-00126 standard.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Institute of Electrical and Electronics Engineers
ISSN: 0278-0046
Last Modified: 09 Nov 2022 11:21
URI: https://orca.cardiff.ac.uk/id/eprint/142874

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