Feasibility Study of 500 Kv Line High-Voltage Reactor Out of Operation in a Hydropower Station

In the early stage of construction of a large hydropower station, in order to solve the problem that the 500 kV long-distance transmission line will lead to the increase of line charging power, a set of high-voltage shunt reactors were installed on the left bank of the hydropower station. In the actual operation process, the high resistance has many defects, which has caused great safety hazards to the safe and stable operation of the transmission line. At present, due to the change of power grid structure parameters and operation mode, it creates conditions for the out of high-voltage reactor. In order to prevent the impact on the transmission line after the exit of the high-voltage reactor, this paper calculates the power frequency overvoltage, secondary-arc current, recovery voltage and switching over-voltage after the exit of the high-voltage reactor, analyses the reactive power balance of the 500 kV power grid near the left bank power station, and verifies the phase modulation and voltage regulation level under the typical operation mode. The results show that the outlet of the hydropower station has the condition of safe operation without high-voltage reactor.