POWER SYSTEM STABILIZER

PROBLEM TO BE SOLVED: To stabilize the power system and improve reliability by controlling the ignition of a pair of thyristors, based on the power deviation from the reference power to the transmission power of a linked line, or the current deviation from the reference current to the transmission current of the linked line. SOLUTION: Transmission power is obtained with a power detection means 6 by line currents and system voltage, and the reference voltage generated by a reference power setting means 10 is subtracted from these to draw out a power deviation, and reverse voltage is generated by a power control means 9. An ignition control means 5 generates the ignition pulses of thyristors 4a and 4b, using the plurality of a line current, the capacity voltage, and reverse voltage. As a result, the system can be stabilized by suppressing the trembling of the power system even at accident of the system. What is more, the power detection means 6 can be omitted by constituting it such that it draws out the current deviation by subtracting the reference current from the line current, using a reference current setting means, in place of the reference power setting means 10, in case that the phase difference between the systems is small.