DocumentCode
3601992
Title
Voltage Multistability and Pulse Emergency Control for Distribution System With Power Flow Reversal
Author
Nguyen, Hung D. ; Turitsyn, Konstantin
Author_Institution
Dept. of Mech. Eng., Massachusetts Inst. of Technol., Cambridge, MA, USA
Volume
6
Issue
6
fYear
2015
Firstpage
2985
Lastpage
2996
Abstract
High levels of penetration of distributed generation and aggressive reactive power compensation may result in the reversal of power flows in future distribution grids. The voltage stability of these operating conditions may be very different from the more traditional power consumption regime. This paper focuses on the demonstration of multistability phenomenon in radial distribution systems with reversed power flow where multiple stable equilibria coexist for the given set of parameters. The system may experience transitions between different equilibria after being subjected to disturbances such as short-term losses of distributed generation or transient faults. Convergence to an undesirable equilibrium places the system in an emergency or in extremis state. Traditional emergency control schemes are not capable of restoring the system if it gets entrapped in one of the low voltage equilibria. Moreover, undervoltage load shedding may have a reverse action on the system and can induce voltage collapse. We propose a novel pulse emergency control strategy that restores the system to the normal state without any interruption of power delivery. The results are validated with dynamic simulations of IEEE 13-bus feeder performed with SystemModeler software. The dynamic models can also be used for characterization of the solution branches via a novel approach, so-called the admittance homotopy power flow method.
Keywords
load flow control; load shedding; power distribution control; power distribution protection; power system dynamic stability; power system restoration; power system simulation; power system transient stability; reactive power control; IEEE 13-bus feeder dynamic simulations; SystemModeler software; admittance homotopy power flow method; distributed generation grids; multiple stable equilibria; power flow reversal; pulse emergency control; radial distribution systems; reactive power compensation; transient faults; undervoltage load shedding; voltage collapse; voltage multistability; Load modeling; Low voltage; Power system control; Power system stability; Transient analysis; Load flow; load modeling; power distribution faults; power distribution protection; power system control; power system dynamic stability;
fLanguage
English
Journal_Title
Smart Grid, IEEE Transactions on
Publisher
ieee
ISSN
1949-3053
Type
jour
DOI
10.1109/TSG.2015.2419880
Filename
7093184
Link To Document