Abstract
Stability issues that are decided by the output impedance of the source converter and the input impedance of the load converter are very important in distributed power systems. The small-signal modeling, effect factors and improvement methods of the output impedance of Buck type DC-DC converters in CCM are investigated in this paper, which provides reference for making converters' impedance standards. A practical impedance measurement approach by using an external small-signal sinusoidal perturbation current is proposed. It can be used to measure the input and output impedance as well as impedance ratio of DC-DC converters. A simple cascaded converter system was built here and the impedance ratio of the source converter and load converter was measured. According to the concept of the forbidden region, the stability of the system was analyzed.
| Original language | English |
|---|---|
| Pages (from-to) | 57-64 |
| Number of pages | 8 |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 31 |
| Issue number | 12 |
| State | Published - 25 Apr 2011 |
| Externally published | Yes |
Keywords
- Distributed power systems
- Forbidden region of impedance ratio
- Input/output impedance
- Stability
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