Abstract
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.
| Original language | English |
|---|---|
| Article number | 6420937 |
| Pages (from-to) | 3539-3549 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Industrial Electronics |
| Volume | 60 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2013 |
| Externally published | Yes |
Keywords
- Active filters
- distributed power
- grid-connected converters
- nonlinear magnetics
- nonlinear systems
- power conversion
- power system measurements
- power transformers
- voltage measurement
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering