A New Nested Neutral Point-Clamped (NNPC) Converter for Medium-Voltage (MV) Power Conversion

Author

Narimani, Mehdi ; Bin Wu ; Zhongyuan Cheng ; Zargari, Navid R.

Author_Institution

Dept. of Electr. & Comput. Eng., Ryerson Univ., Toronto, ON, Canada

Volume

29

Issue

12

fYear

2014

fDate

Dec. 2014

Firstpage

6375

Lastpage

6382

Abstract

In this paper, a new voltage source converter for medium voltage applications is presented which can operate over a wide range of voltages (2.4-7.2 kV) without the need for connecting the power semiconductor in series. The operation of the proposed converter is studied and analyzed. In order to control the proposed converter, a space-vector modulation (SVM) strategy with redundant switching states has been proposed. SVM usually has redundant switching state anyways. What is the main point we are trying to get to? These redundant switching states help to control the output voltage and balance voltages of the flying capacitors in the proposed converter. The performance of the converter under different operating conditions is investigated in MATLAB/Simulink environment. The feasibility of the proposed converter is evaluated experimentally on a 5-kVA prototype.

Keywords

power capacitors; power system control; switching convertors; voltage control; MATLAB-Simulink environment; MV power conversion; NNPC converter; SVM; apparent power 5 kVA; flying capacitors; medium-voltage power conversion; nested neutral point-clamped converter; output voltage control; power semiconductor; redundant switching states; space vector modulation; voltage 2.4 kV to 7.2 kV; voltage source converter; Capacitors; Inverters; Support vector machines; Switches; Topology; Vectors; Voltage control; DC–AC power conversion; multilevel converter; space vector modulation (SVM);

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2306191

Filename

6740051