Black-start method

Abstract

The invention discloses a black-start method, which realizes the improvement of the rapid recovery of a grid and ensures system stability and equipment safety during the black-start process. The invention is achieved by the following technical proposal: in the black-start method, first, taking a large-capacity thermal power generating unit as black-start power supply to impact a large-capacity transformer with the power supply capacity less than that of the black-start power; then gradually restoring the significant load power supply, controlling the current to impact the load transformer towards a lower voltage level progressively, and carrying out power supply to the next electricity grid by the load transformer; and then gradually restoring the power supply to the partition power grid and the district power plants, and transferring electric current to other thermal power generating units with the same voltage level so as to provide electricity necessary for the operation of the corresponding thermal power plant, restore the electricity generation of the corresponding thermal power plant, control the electric current supplied by the power plant with the electricity restored, and impact other load transformers matched with the short-circuit capacity of the power supply system in the electricity networks; and finally gradually restoring the load power supply of the whole electricity grid.

Description

technical field [0001] The invention relates to a black start method, in particular to a method for performing a black start of a power grid with the FCB function of a thermal power unit. technical background [0002] To implement power system reconfiguration, that is, black start, the prevailing method is generally the "snowball" method. The ultimate goal of black start is to quickly restore power supply. Once the power plant is delayed, the power plant will be permanently down, and the consequences will be disastrous. The current common start-up method is to drive various auxiliary systems of the generator set to be started by several thousand kilowatt-class diesel generators, so as to restore the normal operation of the generator set to be started. The power required for normal operation and its power generation capacity are generally about 5% to 7%. In the black start method commonly used at present, the capacity of the generator set to be started is relatively small, g...

AI Technical Summary

Problems solved by technology

Since the black-start power supply generally has a small capacity, impacting a large-capacity transformer with a small power supply will inevitably damage the power equipment and adversely affect the stable operation of the black-start system

The hydroelectric unit is an ideal black-start power source, but it is far away from the load center. As the load recovery of the remote load center, it can be said that "the far-end hydropower cannot quench the thirst of the near"; the thermal power unit or gas unit in the load center usually uses diesel generators to drive Generator, then start a large generator, and gradually restore the load, so it takes a long time; the rapidity of load recovery is also difficult to guarantee