Sizing of STATCOM to Enhance Voltage Stability of Power Systems for Normal and Contingency Cases

Abstract

The electric power infrastructure that has served huge loads for so long is rapidly running up against many limitations. Out of many challenges it is to operate the power system in secure manner so that the operation constraints are fulfilled under both normal and contingent conditions. Smart grid technology offers valuable techniques that can be deployed within the very near future or which are already deployed nowadays. Flexible AC Transmission Systems (FACTS) devices have been introduced to solve various power system problems. In literature, most of the methods proposed for sizing the FACTS devices only consider the normal operating conditions of power systems. Consequently, some transmission lines are heavily loaded in contingency case and the system voltage stability becomes a power transfer-limiting factor. This paper presents a technique for determining the proper rating/size of FACTS devices, namely the Static Synchronous Compensator (STATCOM), while considering contingency cases. The paper also verifies that the weakest bus determined by eigenvalue and eigenvectors method is the best location for STATCOM. The rating of STATCOM is specified according to the required reactive power needed to improve voltage stability under normal and contingency cases. Two case system studies are investigated: a simple 5-bus system and the IEEE 14-bus system. The obtained results verify that the rating of STATCOM can be determined according to the worst contingency case, and through proper control it can still be effective for normal and other contingency cases.

Mejora del proceso de molienda de lactosa para una empresa fabricante de productos lácteos

“…Estos dispositivos están construidos con elementos estáticos y mediante elementos de electrónica de potencia que, en su conjunto, nos permite mejorar el control y aumentar la capacidad de transferencia de energía en sistemas de corriente alterna (CA). El principio de funcionamiento del compensador sincrónico, que es un tipo de FACTS, opera bajo tres criterios fundamentales i) un condensador de corriente continua (CC) detrás de un transformador opera como una fuente de tensión controlable, ii) la diferencia de tensión en la reactancia del transformador produce intercambios de potencia activa y reactiva entre el STATCOM y el SEP y iii) la magnitud de tensión de salida del STATCOM se puede controlar a través de la variación de tensión que circula por el condensador de CC [19][20][21]. Una estructura básica que resume la arquitectura del STATCOM se ilustra con la Figura 2.…”

Voltage Profile and Sensitivity Analysis for a Grid Connected Solar, Wind and Small Hydro Hybrid System

“…There are various criteria for determining the required size of STATCOM devices [62] and [63]. STATCOM devices can be sized considering the ratings of the renewable energy systems connected to the gridas presented in [64].…”

Improvement of the performance of STATCOM in terms of voltage profile using ANN controller

“…Where in this study, a STATCOM device was added to the system. Previous studies had reported that the placement criterion of STATCOM is to have it connected at the weakest bus of the system [20]. The weakest bus was identified as bus 14.…”