A series active capacitance for compensating voltage drops caused by source impedances in power systems

This paper proposes a series active capacitance for power systems which can compensate both harmonic and fundamental voltage drops caused by source impedances. In addition, for the fundamental component, not only the amplitude but also the phase angle can be controlled, so that a receiving-end voltage which is identical to the source voltage is obtained. The basic principles and compensation characteristics of the active capacitance are discussed, and its validity and practicability are demonstrated. The authors conclude that the series active capacitance system proposed in this paper can be applied to flexible AC transmission systems (FACTS)