A Novel Control Method of Three-Level Converter Neutral-Point Potential Balance
- 10.2991/cisia-15.2015.59How to use a DOI?
- three-level converter; neutral-point potential; mathematical model; cutoff frequency
With the neutral-point-clamped (NPC) converter widely applied to direct-drive wind energy generation system, wheather to guarantee the dc-link neutral-point potential (NPP) balance has a crucial influence on the system. Research on grid-side NPC three-level converter, firstly, this paper established NPP fluctuation mathematical model, analyzed the mechanism of NPP AC-DC fluctuations, deduced the relationship between NPP error calculation and system operation mode (rectifier-mode or inverter-mode), and established NPP control model. Secondly, the inherent law of NPP balancing control and the controller parameter tuning method were given by theoretical analysis. In order to suppress NPP AC fluctuations at the extreme, this paper proposes a method designing controller parameters according to the largest open-loop cutoff frequency by system frequency characteristic analysis. The NPP control method has the following advantages: effectively suppressing the NPP AC-DC fluctuations at the same time, fast dynamic response of positive and negative dc-link voltage and high utilization rate of DC voltage. Finally, the correctness of the theoretical analysis was verified by MATLAB simulation.
- © 2015, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - X.H Chai AU - C.J Zhang AU - B. Ben AU - Z.N Guo PY - 2015/06 DA - 2015/06 TI - A Novel Control Method of Three-Level Converter Neutral-Point Potential Balance BT - Proceedings of the International Conference on Computer Information Systems and Industrial Applications PB - Atlantis Press SP - 222 EP - 225 SN - 2352-538X UR - https://doi.org/10.2991/cisia-15.2015.59 DO - 10.2991/cisia-15.2015.59 ID - Chai2015/06 ER -