05/02077 Comparing secondary voltage regulation and shunt compensation for improving voltage stability and transfer capability in the Italian power system

2005 ◽  
Vol 46 (5) ◽  
pp. 307
Keyword(s):  
Power System ◽  
Voltage Stability ◽  
Voltage Regulation ◽  
Transfer Capability ◽  
Secondary Voltage ◽  
Shunt Compensation

Fuzzy Enhancement of Power System Stability Using FACTS Devices

2011 ◽  
Vol 110-116 ◽  
pp. 5200-5205 ◽  
Author(s):  
J. Hamad ◽  
K. El-Bahrawy ◽  
R. Sharkawy
Keyword(s):  
Power System ◽  
Voltage Stability ◽  
System Stability ◽  
Flow Index ◽  
Voltage Profile ◽  
Facts Devices ◽  
Voltage Stability Enhancement ◽  
Compensation Device ◽  
Shunt Compensation ◽  
Criticality Index

This paper investigates voltage stability of the power system during steady state and transient conditions. The voltage stability enhancement is achieved by utilizing FACTS devices at the best location of the system. The weakest bus in the system is the best location to implement shunt compensation device. In this paper, the weakest buses are identified via a fuzzy technique that utilizes two critical indices: Line Flow Index (LFI) and Voltage Profile Index (VPI) during normal and fault conditions. These indices are used to evaluate Criticality Index (CI) using Fuzzy rules, and thus, the system buses are ranked. Remedial actions are discussed to enhance the power system voltage stability by using FACTS devices (SVC and STATCOM) at the most vulnerable system buses. The results of this study show that the (STATCOM) performance is preferable to that of the (SVC) during fault conditions.

Research on Impacts of FACTS on Static Voltage Stability Characteristics of AC/DC Power System

2013 ◽  
Vol 347-350 ◽  
pp. 1440-1444 ◽  
Author(s):  
Fang Li ◽  
Xing Lei Chen
Keyword(s):  
Power System ◽  
Power Flow ◽  
Voltage Stability ◽  
Stability Limit ◽  
Static Voltage Stability ◽  
Facts Devices ◽  
Dc Power ◽  
Steady State Model ◽  
Calculation Results ◽  
Shunt Compensation

Based on the improved Continuation Power Flow algorithm, this paper investigates the impacts of FACTS on static voltage stability characteristics of AC/DC hybrid power system. This paper introduces the steady-state model of different FACTS devices, and the power flow mathematical model is established about AC/DC power system with FACTS devices. The impacts of FACTS devices with various capacities in different locations on static voltage stability are compared and analyzed. The calculation results of a four-machine two regions AC/DC power system show that FACTS are able to improve the voltage stability and the installation of SVC shunt compensation can possess a better effect to improve the system static voltage stability limit than TCSC series compensation.

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