The paper addresses the practical design aspects of a 200 MW prototype
for the interconnection of two synchronous 120-kV networks that are c
lose to their short-circuit limits. The Interphase Power Controller is
a new concept for the control of active and reactive power; it uses o
nly standard components connected in an original manner. The paper giv
es the results of EMTP simulations for the conditions governing the de
sign of the components. The significant steady-state and transient cap
abilities of the components are given as well as insulation coordinati
on and protection aspects. Finally, a preliminary layout is presented
for the prototype.