DocumentCode :
406844
Title :
Considerations on the impedance character and impedance criterion in two-stage dc distributed power system
Author :
Wang, Xiaopeng ; Yao, Ruoping ; Rao, Fangquan
Author_Institution :
Dept. of Electr. Eng., Shanghai Jiao Tong Univ., China
Volume :
2
fYear :
2003
fDate :
2-6 Nov. 2003
Firstpage :
1667
Abstract :
Impedance character as well as relevant impedance criterion is important in the small-signal stability analysis of multi-stage dc distributed power systems, where subsystems are integrated. At the same time, we usually approximately simplify a tightly controlled load-converter as constant power load. In this paper, we focus on the impedance character and impedance criterion in two-stage DC distributed system, which is in fact inter-dependent dynamical system with both interaction loop and many individual regulation loops. We verify that minor loop gain method can be directly extended to inter-dependent subsystems, while original impedance criterion cannot. Furthermore, we develop a substitutional impedance criterion, which is more efficient on small-signal stability analysis. With this substitutional impedance criterion, we discuss the influence of regulation loop gain, load resistance, input voltage and various duty-cycle ratios on system small-signal stability. In addition, we analyze the impedance shift process of the input impedance of load-converter and build the relationship between it and regulation loop gain. Negative resistor approximation of load-converter is only regarded reasonable when high regulation-loop gain is assumed and low-frequency character of load-converter is considered. Simulation results illustrate the validity of the substitutional impedance criterion.
Keywords :
distribution networks; electric impedance; power convertors; power system stability; impedance character; impedance criterion; interdependent subsystems; load-converter; loop gain method; multistage dc distributed power systems; small-signal stability analysis; Hybrid power systems; Impedance; Power system analysis computing; Power system dynamics; Power system reliability; Power system simulation; Power system stability; Power systems; Stability analysis; Stability criteria;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Electronics Society, 2003. IECON '03. The 29th Annual Conference of the IEEE
Print_ISBN :
0-7803-7906-3
Type :
conf
DOI :
10.1109/IECON.2003.1280308
Filename :
1280308
Link To Document :
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