Document Type
Thesis
Date of Award
1-31-2012
Degree Name
Master of Science in Power and Energy Systems - (M.S.)
Department
Electrical and Computer Engineering
First Advisor
Walid Hubbi
Second Advisor
Edip Niver
Third Advisor
Marek Sosnowski
Abstract
The voltage collapse in power system is a major concern for reliable operation of these systems. In this thesis, a method is proposed to determine the load margins at load nodes (loadability limits). A good portion of the computation to obtain those margins is routinely done when solving the power flow problem, thus the computational effort is greatly reduced. The proposed method is based on the fact that when voltage collapse occurs the Jacobian matrix, that is calculated when performing power flow analysis, is singular. The relationships between the elements of the Jacobian matrix and the nodal powers are exploited to determine the nodal powers that make this matrix singular. Thus, an index that determines the nodal loadability limit is calculated at every bus. This index is used to rank load nodes in terms of their proximity to the load limit that the system can provide these nodes.
The proposed method is tested using the IEEE 14-bus and the 30-bus test systems.
Recommended Citation
Li, Hongxiang, "A new method for node ranking for voltage stability in power systems" (2012). Theses. 3323.
https://digitalcommons.njit.edu/theses/3323
