The harmonic analysis of firing delay angle based on self-power supply optical trigger 10kv high-voltage TSC device

As a conventional high-voltage reactive power compensation device, high-voltage thyristor switched capacitor (TSC) reactive power compensation device is widely used in high-voltage areas. However, when the thyristor is turned on completely, the valve terminal voltage is zero, and trigger circuit can not taken energy from the damping circuit to trigger thyristors. In order to solve the problem, the self-power supply optoelectronics trigger circuit has been a hot research. A set of device based on self-power supply photoelectric trigger 10 kv High-voltage TSC is proposed in this paper. It can delay a certain angle to achieve self-power supplying of the thyristor trigger circuit. It will result in a surge current due to the impact of voltage jumping when firing angle delay exists, which causes the trigger pulse disorder further. Therefore, in order to restrain the surge current, the reactor must be configured properly in actual. In this paper, the relationships between TSC trigger pulse delay angle and reactor and the harmonic content are analyzed according to the theory and simulation results.