Non-linear loads such as AC drives switch-mode power supplies and grid-connected converters can cause, besides the generation of unwanted current harmonics, a DC current component injection into the grid. This DC current component can lead to magnetic saturation of the distribution power transformers, leading to higher current distortion and overheating. This paper presents a method to detect the DC current component flowing into the distribution power transformer with a precise measurement of the DC voltage component at the transformer winding. A magnetic sensor has been developed and implemented in a closed-loop control system to achieve a high sensitivity and guarantees a good linearity with a high rejection ratio to grid voltage variations. Simulation and experimental results confirm the effectiveness of the proposed approach.
Detection Method of the DC bias in Distribution Power Transformers / Buticchi, Giampaolo; E., Lorenzani. - In: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS. - ISSN 0278-0046. - (2013). [10.1109/TIE.2012.2226418]
Detection Method of the DC bias in Distribution Power Transformers
BUTICCHI, Giampaolo;
2013-01-01
Abstract
Non-linear loads such as AC drives switch-mode power supplies and grid-connected converters can cause, besides the generation of unwanted current harmonics, a DC current component injection into the grid. This DC current component can lead to magnetic saturation of the distribution power transformers, leading to higher current distortion and overheating. This paper presents a method to detect the DC current component flowing into the distribution power transformer with a precise measurement of the DC voltage component at the transformer winding. A magnetic sensor has been developed and implemented in a closed-loop control system to achieve a high sensitivity and guarantees a good linearity with a high rejection ratio to grid voltage variations. Simulation and experimental results confirm the effectiveness of the proposed approach.File | Dimensione | Formato | |
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