2019
DOI: 10.1109/tasc.2019.2895580
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Investigation of the Effects of DC Current Injected by Transformer-Less PV Inverters on Distribution Transformers

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Cited by 19 publications
(3 citation statements)
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“…Even though TLPVIs are very efficient, lightweight, and cost-effective, there have been reports of negative impacts on the distribution transformer [27]. An inadequate DC part can cause a lot of DC to flow into the grid, which can be problematic as it can cause the transformer to overload, the relay to fail, the capacitor to overheat, the AC current to ripple and have harmonics, and to trigger the need for more reactive power to rise [7], [28].…”
Section: Offsetmentioning
confidence: 99%
“…Even though TLPVIs are very efficient, lightweight, and cost-effective, there have been reports of negative impacts on the distribution transformer [27]. An inadequate DC part can cause a lot of DC to flow into the grid, which can be problematic as it can cause the transformer to overload, the relay to fail, the capacitor to overheat, the AC current to ripple and have harmonics, and to trigger the need for more reactive power to rise [7], [28].…”
Section: Offsetmentioning
confidence: 99%
“…The DC current injection should be less than 1% of the rated output current from the inverter for each phase . The test points for this test are located at the output terminals of each inverter for central inverters and at the common output point of a group of inverters for string inverters.…”
Section: Specific Criteria Of the Inverter Testmentioning
confidence: 99%
“…The direct current (DC) or quasi DC current flowing through transformers, which are AC machines traditionally designed for rated AC voltage, current, and power conditions at supply grid frequency, is generally called transformer DC-biased case in the literature [1,2]. In the AC power networks, DC-biased cases can occur due to induction of very low-frequency voltages on transmission lines related to variation of the geomagnetic field and improper design of grounding systems of high voltage DC transmission systems and photovoltaic distributed generation units [3][4][5][6][7]. Transformers can be saturated with DC bias.…”
Section: Introductionmentioning
confidence: 99%