抄録
New technologies such as synchronized switching and power electronics will make it possible to change the configuration of transmission network in the future electric power systems. It is called VIPS (Variable Impedance Power System) by the authors. The authors have been studying the effects of those technologies on power system stabilities. This paper deals with the improvement of transient stability by means of switching-over control of transmission lines. It is made clear that in some power systems the simultaneous energization of the line de-energized in normal state with the fault clearing better improves first swing stability than the pre-and post-fault energization of the line. The energy function based index to select such a transmission line is derived. In addition, this paper shows multiple switching of transmission line improves damping of post-fault conditions, where minimization of time derivative of energy functions is used. The switching-over control is applied to multi-machine power systems and its effectiveness is demonstrated.
