Method for connecting nuclear power plant to external power supply again after black start of power grid

Abstract

The invention belongs to the electrical field, and particularly relates to a method for connecting a nuclear power plant to an external power supply again after black start of a power grid. After severe natural disasters occur, no actual power supply exists in the black start process of a power grid, and after electric energy stored in a storage battery is used up, equipment in a station cannot be operated, and access of an external power grid power source cannot be achieved. Therefore, a method and a necessary device for re-accessing the external power supply to the nuclear power plant after the black start of the power grid need to be provided. The method comprises the following steps: step 1, determining the type of a temporary external power supply; 2, determining the capacity of a temporary external power supply; step 3, determining an access mode of an external power supply; 4, an external power supply is connected; 5, switching station equipment is put in; and 6, quitting the external power supply. According to the method, the temporary external power supply transfer box is additionally arranged, so that the access work of the temporary external power supply is simplified, the working efficiency is improved, and a better emergency plan is provided for emergency exercises of black-start related nuclear power plants at ordinary times.

Description

technical field [0001] The method belongs to the electrical field, and specifically relates to a method for reconnecting a nuclear power plant to an external power supply after a grid black start. Background technique [0002] After a severe natural disaster, during the black start of the power grid, after a long time (days or even weeks) loss inside and outside the nuclear power plant, although the improvement item considered that the nuclear island safety system continued to use mobile diesel generators for power supply, but Other non-safety-related systems and workshops have actually no power supply. The 500kV and 220kV power plants and other switch stations connected to the external power grid have also lost power supply for a long time. The duration of power supply is also limited (for example: the battery capacity of the DC system power distribution of the M310 power plant generally only guarantees power supply for 1 hour). After the electric energy stored in these ba...

AI Technical Summary

Problems solved by technology

After the electric energy stored in these batteries is also used up, all the AC and DC power sources in the switch station have been lost, the switch auxiliary power supply has lost, the switch energy storage power supply and control and protection power supply will be lost, and the equipment in the station cannot be operated and the power supply from the external grid cannot be realized. access

[0003] At present, in the various accident plans of nuclear power plants (especially in operating nuclear power plants), they have not fully considered how the external power grid will be restored after the external grid fails to supply power for a long time (that is, after the grid "black start"), how the nuclear power plant will use the external power supply The problem of connecting to the nuclear power plant for normal power supply affects the reliability of the power supply for the long-term operation of the nuclear safety facilities of the nuclear power plant.

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