Due to the high pressure rating of thyristor, the thyristor widely used in highvoltage dynamic reactive power compensation device. Thyristor valves composed of thyristor series are core devices of thyristor controlled reactor (TCR). In high voltage, driving circuit of the thyristor valve in which manner obtains energy is the problem of highvoltage dynamic reactive power compensation device that must consider. In order to increase the reliability of thyristor series operation, this paper design a voltage and current access circuits to meet both TCR in the trigger angle to obtain energy, to power driving circuit, achieving high thyristor valve system selfpowered. Establishment of each energyobtaining circuit simulation model in PSPICE software, the simulation results show that the high energyobtaining circuits can not only reduce switching losses and improve the efficiency of thyristor operation but also provide power to the drive circuit, which provide fundamental basis for stable power supply of thyristor driving circuit.