Black-start control device and method for supplying station service power to hydroelectric generating set during line tripping

Abstract

The invention discloses a black-start control device for supplying station service power to a hydroelectric generating set for line tripping. The black-start control device comprises a power supply module, a circuit breaker position detection module, a main control module and a tripping module. According to the device, a circuit breaker position detection module detects tripping of a circuit breaker and then transmits a signal to a main control module, the main control module judges the number of operating units of a hydropower station through the positions of circuit breakers, connected witha power grid, of all the units of the circuit breaker position detection module, and only one unit is reserved in the operating units when the circuit trips; other operation units disconnect the circuit breaker connected with the power grid through the tripping module, thereby ensuring operation of one unit in the hydropower station, and realizing line tripping. The isolated network operation of one unit is kept in the hydropower station, thereby realizing station service power island operation, and waiting for power grid dispatching to quickly implement black start and send out a power supply. According to the invention, the black start preparation time can be shortened, and the safety of a plant system is ensured.

Description

technical field [0001] The invention belongs to the technical field of black start, and in particular relates to a black start control device and method for power supply of a hydroelectric unit for power supply by line tripping. Background technique [0002] The AC power supply system maintains the balance between power generation and power consumption in real time. In the event of an accident, the balance between supply and demand will be disrupted. In severe cases, it may cause a power outage of the entire network. The restart of the power grid will require the support of a black start. Therefore, in order to cope with extreme situations, the power grid must consider various possible technologies for rapid transmission after power failure. When the output line of the hydropower station trips, generally the units in the hydropower station will enter the shutdown state. At this time, if the backup power supply is also without power supply, it will cause the units of the hydr...

AI Technical Summary

Problems solved by technology

When the output line of the hydropower station trips, generally the units in the hydropower station will enter the shutdown state. At this time, if the backup power supply is also without power supply, it will cause the units of the hydropower station to have no factory power, and the auxiliary machines of the hydropower station will stop working, and the whole station will be shut down. It will develop towards unpredictable and serious consequences, which is very detrimental to the safety of the main and auxiliary equipment in the entire station

When the power grid line trips, some hydropower stations transform the hydropower units into isolated grid operation without shutting down when the line trips. The speed and frequency will increase rapidly, and finally the hydroelectric units will compete for power, that is, the power will be positive and negative at one time, and the stable operation of the isolated grid cannot be maintained. Finally, the protection action will cut off the hydroelectric units, causing the entire plant to In the case of power failure, the hydropower station must designate a hydroelectric unit to quickly perform a black start in order to quickly restore the power consumption of the plant, but usually it takes time to start a unit, so it is necessary to keep only one unit in the hydropower station after the line trips. One unit supplies power to the plant, and other units trip, so that the equipment in the hydropower station can operate without power failure. At the same time, according to the grid dispatching instructions, the power is sent again quickly, shortening the black start time

At present, there is no relevant literature on the black start control device and method for the power supply of a hydropower unit for power supply of a hydropower station. In the future, this direction will also become a popular research direction for black start.

Images