Proceedings of the International Conference on Computer Information Systems and Industrial Applications

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A Novel Control Method of Three-Level Converter Neutral-Point Potential Balance

Authors
X.H Chai, C.J Zhang, B. Ben, Z.N Guo
Corresponding Author
X.H Chai
Available Online June 2015.
DOI
10.2991/cisia-15.2015.59How to use a DOI?
Keywords
three-level converter; neutral-point potential; mathematical model; cutoff frequency
Abstract

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.

Copyright
© 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/).

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Volume Title
Proceedings of the International Conference on Computer Information Systems and Industrial Applications
Series
Advances in Computer Science Research
Publication Date
June 2015
ISBN
978-94-62520-72-1
ISSN
2352-538X
DOI
10.2991/cisia-15.2015.59How to use a DOI?
Copyright
© 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

risenwbib
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  -