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On-line Access: 2010-08-02

Received: 2009-09-10

Revision Accepted: 2010-01-05

Crosschecked: 2010-07-01

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Journal of Zhejiang University SCIENCE C 2010 Vol.11 No.8 P.654-662

http://doi.org/10.1631/jzus.C0910559


New method for estimating flying capacitor voltages in stacked multicell and flying capacitor multicell converters


Author(s):  Arash Khoshkbar Sadigh, Gevorg B. Gharehpetian, Seyed Hossein Hosseini

Affiliation(s):  Faculty of Electrical & Computer Engineering, University of Tabriz, Tabriz 51666, Iran, Department of Electrical Engineering, Amirkabir University of Technology, Tehran 15914, Iran

Corresponding email(s):   a.khoshkbar.sadigh@ieee.org

Key Words:  Flying capacitor multicell converter, Stacked multicell converter, Flying capacitor voltage, Phase shifted sinusoidal pulse width modulation


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Arash Khoshkbar Sadigh, Gevorg B. Gharehpetian, Seyed Hossein Hosseini. New method for estimating flying capacitor voltages in stacked multicell and flying capacitor multicell converters[J]. Journal of Zhejiang University Science C, 2010, 11(8): 654-662.

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doi="10.1631/jzus.C0910559"
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Abstract: 
Multicell converters are an interesting alternative for medium voltage and high power applications, because of the increased number of output voltage levels and apparent frequency. The two most significant types of multicell converter are the flying capacitor multicell (FCM) converter and its derivative, stacked multicell (SM) converter. Balancing flying capacitor voltages is an important constraint to the proper performance of FCM and SM converters. Thus, observation of the flying capacitor voltages used in active control is valuable, but using voltage sensors for observation increases cost and size of the converter. This paper deals with a new strategy to estimate the flying capacitor voltages of both FCM and SM converters. The proposed strategy is based on a discrete time model of the converter and uses only a load current sensor. The circuit was simulated using PSCAD/EMTDC software and simulation results were presented to validate the effectiveness of the proposed estimation strategy in observing the flying capacitor voltages. Simplicity is the most significant advantage of the proposed strategy, its performance being based on simple equations.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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Open peer comments: Debate/Discuss/Question/Opinion

<1>

zhaizy

2010-08-02 17:14:21

Reviwer 1: Useful paper in terms of applying state theory to a flying capacitor converter to back calculate the capacitor voltages from the output load conditions. Reviwer 2: A good paper on a timely subject.
--Editor

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