Detection Method of the DC Bias in Distribution Power Transformers

作者：Buticchi Giampaolo^*; Lorenzani Emilio

来源：IEEE Transactions on Industrial Electronics, 2013, 60(8): 3539-3549.

DOI：10.1109/TIE.2012.2226418

• Active filters
• distributed power
• grid-connected converters
• nonlinear magnetics
• nonlinear systems
• power conversion
• power system measurements
• power transformers
• voltage measurement

Nonlinear loads such as ac drives, switch-mode power supplies and grid-connected converters can cause, in addition to 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.

• 出版日期2013-8