For single-phase DC-AC power conversion, power decoupling is always required due to the existence of double-line-frequency ripple caused by the instantaneous unbalanced power between AC and DC side. The typical power decoupling method utilizes a large electrolytic capacitor and consequently increases the passive components requirement. The active power decoupling scheme introduces an additional low power converter to compensate the ripple, which inevitably increases the system cost and control complexity. To overcome these drawbacks, this paper proposes a novel suppression method based on three-level topology. By optimizing the capacitance design and improved control algorithm, the instantaneous unbalanced power is dynamically redistributed between two series connected intermediate capacitors in order to make the capacitor voltage ripple complementary to each other. Thus the de-link voltage ripple can be reduced to a large extent. Simulation verifies the correctness and effectiveness of the new suppression method.
|Original language||English (US)|
|Title of host publication||2018 9th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2018|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|State||Published - Aug 27 2018|
|Event||9th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2018 - Charlotte, United States|
Duration: Jun 25 2018 → Jun 28 2018
|Name||2018 9th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2018|
|Conference||9th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2018|
|Period||6/25/18 → 6/28/18|
Bibliographical noteFunding Information:
This work was supported in part by the State Key Laboratory of Electrical Insulation and Power Equipment under the Grant EIPE16310 and Power Electronics Science and Education Development Program of Delta Environmental & Educational Foundation DREG2016010.
© 2018 IEEE.
- DC-AC Converter
- Double-line-frequency Ripple Suppression
- Power Decoupling Method