Comparative Study among Shunt Capacitor, SVC and STATCOM for Prevention of Voltage Collapse

K. Mori, M. Goto, T. Matsukawa, Y. Yokomizu, and T. Matsumura (Japan)


Voltage Stability, Voltage Collapse, Shunt Capacitor, SVC, STATCOM.


This paper describes a quantitative study of a shunt capac itor, an SVC (Static Var Compensator) and a STATCOM (Static Synchronous Compensator) in the purpose of pre venting voltage collapse. The voltage stability as affected by the response time of the reactive power compensators is studied. The stability limit of the response time of a shunt capacitor is theoretically obtained. The relationship between the response time of the shunt capacitor and the load time constant was found to be linear. Also, the stabi lizing effects of shunt capacitor, SVC and STATCOM were compared in terms of response time. The quantitative dif ference of SVC being composed of capacitors and reactors, and STATCOM based on voltage-source inverters were in vestigated in terms of required reactive power (capacity). The required capacity for the SVC was found to be 1.7 times as large as that of the STATCOM. Therefore, to avoid voltage collapse, the STATCOM can be more effective than the SVC.

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