D-FACTS Devices

D-FACTS Device Overview

Distributed Flexible AC Transmission System (D-FACTS) devices or "smart wires" change the effective line impedance of the transmission line on which they are installed [1]. Simulator supports the response of D-FACTS devices respond based on line current. This functionality is described in [2] and [3].

For each line with D-FACTS devices, it is necessary to specify the number of modules and the amount of reactive impedance per module. The activation current I₀ and the maximum current I_limmust also be specified. Below I₀, the D-FACTS devices are inactive. Above I_lim, the cumulative impedance injection of the D-FACTS devices on the line is at its maximum value. In Simulator, each module can be switched on or off. The D-FACTS device operation characteristic is represented by a function of the following form:

To view or insert D-FACTS devices on a transmission line, the D-FACTS Settings Dialog may be used. This dialog can be accessed from the Model Explorer or from the Parameters tab of the Branch Options dialog. In addition to saving D-FACTS devices in the PowerWorld binary file, full Case Information Display support is available. This allows D-FACTS devices to be read in from an auxiliary file or imported from Excel.

PowerWorld Support of D-FACTS Devices

D-FACTS Case Information Displays

D-FACTS Power Flow Modeling

D-FACTS OPF Control

D-FACTS Oneline Displays

Sensitivity Analysis

[1] D. M. Divan, W. E. Brumsickle, R. S. Schneider, B. Kranz, R. W. Gascoigne, D. T. Bradshaw, M. R. Ingram, and I. S. Grant, “A distributed static series compensator system for realizing active power flow control on existing power lines,” IEEE Transactions on Power Delivery, vol. 22, no. 1, pp. 642-649, Jan 2007.

[2] H. Johal and D. Divan, “Design considerations for series-connected distributed FACTS converters,” IEEE Transactions on Industry Applications, vol. 43, no. 6, pp. 1609-1618, Nov./Dec. 2007.

[3] H. Johal and D. Divan, “Current limiting conductors: A distributed approach for increasing T&D system capacity and enhancing reliability,” in 2005/2006 IEEE PES Transmission and Distribution Conference and Exhibition, pp.1127-1133, May 2006.