The representation of shunt elements in fast decoupled power flows

Author

Saavedra, O.R. ; Garcia, A. ; Monticelli, A.

Author_Institution

UNICAMP, Campinas, Brazil

Volume

9

Issue

3

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

1434

Lastpage

1440

Abstract

This paper discusses the representation of shunt elements in fast decoupled power flow methods. Two major problems have long been recognized as critical to the convergence of decoupled methods: the first one is the well known effect of high r/x ratios; and the second, not so popular, is the effect the representation of shunt elements in the B" matrix. For the first problem there is at least one adequate approach available in the literature. This paper analyzes the second type of problem, gives a mathematical explanation to its causes, proposes a robust version, and illustrates its behavior with a variety of examples. Test results supporting the basic theory are reported. Tests have been conducted in difficult real-life systems, varying from a 308-bus, 208 V distribution grid to a 1663-bus transmission network with voltage levels ranging from 69 kV to 750 kV

Keywords

digital simulation; distribution networks; load flow; matrix algebra; numerical analysis; power system analysis computing; transmission networks; 208 V; 69 to 750 kV; B" matrix; computer simulation; convergence; distribution grid; fast decoupled power flows; high r/x ratios; power systems; shunt elements; transmission network; Convergence; Load flow; Performance evaluation; Power systems; Robustness; Samarium; Shunt (electrical); System testing; Transformers; Voltage;

fLanguage

English

Journal_Title

Power Systems, IEEE Transactions on

Publisher

ieee

ISSN

0885-8950

Type

jour

DOI

10.1109/59.336120

Filename

336120