Static Voltage Stability Analysis Based on PSS/E - Intelligent Computing for Sustainable Energy and Environment - page 194

Static Voltage Stability Analysis
Based on PSS/E
Xiaoyan Bian, Fangqi Yuan, and Yang Fu
Power and Automation Engineering Department, Shanghai University of Electrical
Power, 200090, Shanghai, China
{ kuliz,yuanfangqi2 } @163.com
Abstract. In this paper, the static voltage stability is studied by PSS/E.
Firstly, the author gives the mechanism of branch contingency rank-
ing,PV,QV curve in the analysis of voltage stability of PSS/E.PV curve
is to find the maximum transfer power limit,while comprehensive sensi-
tivity indicator is used to analyze static voltage stability in the method
of QV curve. Then,the author takes advantage of the above-mentioned
methods to analyze the static voltage stability of a standard test sys-
tem.In the process of analysis, simulation results are demonstrated and
analyzed.IEEE 30 Bus Test Case is analyzed and explained as an
example.
Keywords: Contingency Ranking, Transfer Power Limit, Voltage Sta-
bility, PV Curve, QV Curve.
1 Introduction
Voltage stability refers to the ability of a power system to maintain steady volt-
ages at all buses in the system after being subjected to a disturbance from a
given initial operating condition. In recent years, voltage instability or collapse
continue to emerge. Great importance has been attached to the study of voltage
stability problems. At the same time, the voltage stability studies, especially in
the field of static voltage stability, have make great progress in recent years. At
present, the method of the static voltage stability analyze includes sensitivity
analysis and the maximum power method, the maximum power method includ-
ing the PV curve method, QV curve and bifurcation analysis [1]. The objective
of a PV and QV curves is to determine the ability of a power system to main-
tain voltage stability at all the buses in the system under normal and abnormal
steady-state operating conditions. The PV and QV curves are obtained through
a series of ac power flow solutions. The PV curve is a representation of voltage
change as a result of increased power transfer between two systems, and the QV
curve is a representation of reactive power demand by a bus or buses as voltage
level changes [2].
However, the P-V curve has neglected the system load characteristic influence,
and its inflection point reflects the electric power network transmission power