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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (6): 890-899    DOI: 10.1631/jzus.A0820294
Electrical & Electronic Engineering     
A novel control strategy for load converter of DC isolated distribution system under unbalanced loading conditions
R. NOROOZIAN, M. ABEDI, G. B. GHAREHPETIAN, S. H. HOSSEINI
Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran; Department of Electrical and Computer Engineering, Tabriz University, Tabriz, Iran
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Abstract  A novel control strategy for the load converter supplying the unbalanced AC load in a DC isolated distribution system is presented. The control algorithm results in balanced and sinusoidal load voltages under unbalanced AC loading. The unbalanced load is characterized in the d-q-0 rotating coordinate based on symmetrical sequence components. Also, the mathematical model of the load converter in both a-b-c and d-q-0 coordinates is derived by using the average large signal model. Then, two control strategies for the load converter are presented. The first one uses the conventional d-q-0 controller to ensure the voltage and current regulation. The second one is a newly proposed control strategy based on the decomposition of the voltage and current into instantaneous positive, negative, and zero sequences. These three sequences are controlled independently in their own reference frames as DC signals. The performance of the load converter using these two control strategies is compared. Simulation results show the validity and capability of the newly proposed control strategy.

Key words： Unbalanced load      Power quality      Symmetrical components      Control strategy     
Received: 18 April 2008     
CLC:  TM7  
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R. NOROOZIAN
M. ABEDI
G. B. GHAREHPETIAN
S. H. HOSSEINI
Cite this article:

R. NOROOZIAN, M. ABEDI, G. B. GHAREHPETIAN, S. H. HOSSEINI. A novel control strategy for load converter of DC isolated distribution system under unbalanced loading conditions. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(6): 890-899.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0820294     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I6/890

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