Abstract
This paper investigates the design and implementation of virtual-output-impedance shaping on an inverter-loaded, fuel-cell-battery-powered dc-dc converter system for achieving near-ripple-free dc bus voltage regulation. The method is based on the insertion of a second output-voltage feedback loop as can be inferred from the Mason's gain formula. Three basic modes of virtual-output-impedance shaping (proportional, derivative, integral) are discussed and the closed-loop output-impedance characteristics due to each of them are analyzed in detail and with their The'venin equivalent circuits derived. Despite the suitability of integral feedback for minimizing converter's output impedance, it can give rise to an unwanted resonance peak near the converter's crossover frequency, thus potentially destabilizing the system. The solution to the problem using combination of basic virtual-outputimpedance shaping modes and its practical implementation are discussed. When implemented on a fuel-cell-battery-powered dualactive-bridge dc-dc converter, the second-harmonic distortion of dc bus voltage is shown to have been reduced by 85.5% compared to a conventionally PI-compensated system.
| Original language | English |
|---|---|
| Article number | 07108066 |
| Pages (from-to) | 2187-2199 |
| Number of pages | 13 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 31 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Mar 2016 |
Keywords
- Bidirectional converters
- DC-DC converters
- Dual active bridge
- Energy storages
- Fuel cells
- Outputimpedance shaping
ASJC Scopus subject areas
- Electrical and Electronic Engineering
