Abstract
This paper presents a study of FACTS devices mainly static synchronous compensator (STATCOM) on loading margin study and power stability. Their steady state modeling and effects on power system performance have been studied. Effects of STATCOM on system loadability have been discussed and presented here. Continuation power flow is used to evaluate the effects of this device on system loadability. Eigenvector analysis applied at the maximum loading point is used to rank the most critical voltage buses. After that, it would be possible to optimize location of STATCOM in order to achieve maximum enhancement of system loadability. The models and methodology for placing STATCOM are tested in a 14 bus system. Test system reveals that the incorporation of STATCOM significantly improves Loading Margin and the line power transfer capability of the system and therefore, the stability of the system is increased. Keywords: Continuation power flow; maximum loading; STATCOM; voltage stability
Highlights
Voltage stability refers to the ability of a power system to maintain steady voltages at all buses in the system after being subjected to a disturbance from a given initial operating condition (IEEE-CIGRE, 2004)
This paper presents a study of flexible AC transmission system (FACTS) devices mainly static synchronous compensator (STATCOM) on loading margin study and power stability
Short-term voltage stability problems are usually associated with the rapid response of voltage controllers (e.g., generators’ automatic voltage regulator (AVR)) and power electronic converters, such as those encountered in flexible AC transmission system or FACTS controllers and high voltage DC (HVDC) links
Summary
Voltage stability refers to the ability of a power system to maintain steady voltages at all buses in the system after being subjected to a disturbance from a given initial operating condition (IEEE-CIGRE, 2004). The voltage stability phenomenon may be due to slow change of the load in the system or large contingency occurring such as loss of generators, transmission lines and transformers. These disturbances are led to voltage progressive drop in a vital section of system, which cause instability (Taylor, 1993). A static synchronous compensator (STATCOM) is a regulating device used on alternating current electricity transmission networks It is based on a power electronics voltage-source converter and can act as either a source or sink of reactive AC power to an electricity network. The stability limit or critical point is defined as the point where the power flow Jacobian is a singular
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