I. Introduction
Despite the large number of deep and extensive works on mode control and reactive power balance of ultra-high voltage transmission lines, it is believed that the features imposed by intermediate systems (PS) do not allow us to consider these issues exhausted [1]–[4]. The new generation of controlled shunt reactors, static thyristor compensators and capacitor banks, developed in recent years, significantly expands the possibilities of their application. for more flexible management of modes, primarily reactive power balancing.