The invention discloses an iron core
reactance regulator with the current control and short-circuit current-limiting functions and a control method thereof. The iron core
reactance regulator comprises six square-shaped iron cores,
direct current coils and
alternating current coils. Each square-shaped iron core comprises a
middle column, a side column, an upper
magnet yoke and a lower
magnet yoke, the six middle columns are combined to form a combined
middle column, and the distance between the combined column and each side column adjacent to the combined column is equal. The
direct current coils wind the combined
middle column and are connected with an adjustable bias
direct current source. The
alternating current coils wind the side columns, and dotted terminals of the two
alternating current coils on the opposite side columns are connected into a whole to be connected to a
power grid. Air gaps are formed in the square-shaped iron cores. The control method comprises that when the
power grid operates stably, the current value of the adjustable bias direct
current source is adjusted to the command value; when the
short circuit occurs and the short-circuit current is larger than the stable working current, the output current of the adjustable bias direct
current source is lowered to the zero. The iron core
reactance regulator is simple in structure, easy to achieve, low in cost and high in reliability.