Process for stabilizing of an AC network against reactive power fluctuations and reactive power compensating apparatus

摘要

A process for stabilising an AC network supplying a load against reactive power variations has the load current controlled in a circuit using the load (8) as a control path. At least one converter (5) is used. The reactive power drawn by the load is kept to a preset value by a separate control circuit, also using the load as a control path. The current through the load flows through at least two control circuits, one being independent of the reactive power control circuit, the other not being independent of it. The load is actually a DC arc furnace and the distance of the moving electrode from the bath surface depends on the output signal of the reactive power control circuit.