Reactive power compensation by TCR technology: simulation for large electrical loads control

It is noted that the ability of an FC-TCR (fixed-capacitor thyristor controlled reactor) compensator to change its reactive power within the theoretical time of half a period requires, as a prerequisite, the setting up of a proper control function. In other words, the firing angle α of the thyristors in antiparallel has to be related to properly detectable input variables, i.e. load reactive power. The theoretical and computer-simulation approaches to this problem are examined and compared. The equations describing the relation between α and the load reactive power are introduced. The whole system is then modeled and simulated by computer, and the results are compared with the theoretical ones. The control curves obtained theoretically agree well with those obtained by simulation. It is concluded that the proposed analytical approximating equation offers quite good results for practical purposes