110 kV voltage class pentagonal wiring hydropower station black-start test system and method

Abstract

The invention discloses a 110 kV voltage class pentagonal wiring hydropower station black-start test system and method, wherein the110 kV system is of a pentagonal wiring structure; after power loss of a sending-out line is simulated, a 400V factory bus power supply incoming line switch of a black-start test unit is disconnected, a standby power supply automatic switching system automatically switches on an interconnection switch, the 400V factory bus power supply of the black-start test unit recovers power supply, a diesel generating set is started, voltage is built to rated voltage, the 400Vinterconnection switch is disconnected, and the diesel generator supplies power to recover the plant load of the black-start test unit. A hydraulic turbine set is started, the generator with a main transformer is boosted to rated voltage from zero, an outlet switch of the diesel generator is switched off, a station service power supply switch is switched on, self power supply of the hydraulic turbine generator is recovered by a 400V station service bus power supply, a network switch is combined, power supply of a power transmission line is recovered, and connection to other lines in a grid-connected manner in the same period is realized; the safety of the black-start test of the hydropower station is improved, and the novel black-start test system and method are provided.

Description

technical field [0001] The invention belongs to the technical field of black start, and in particular relates to a black start test system and method for a pentagonal connection hydropower station with a voltage level of 110kV. Background technique [0002] With the continuous development of the power system, the scale of the power grid is getting larger and larger, and the country has higher and higher requirements for the safety level of the power grid. When it is started, the power supply will be supplied at the first time, helping the power grid to restore power supply in time, ensuring power supply, and improving the ability to respond to natural disasters, which has important social status and benefits. At present, the main power source of self-starting in my country is hydropower. With its natural advantages, the hydropower station will start the diesel generator immediately after the grid loses power, and restore the power supply of the power system of the hydropower...

AI Technical Summary

Problems solved by technology

At present, the known black start test technology has the following defects and deficiencies: (1) the time for power failure of the plant power bus of the hydraulic turbine unit to be tested is long, which reduces the safety of the black start test of the hydraulic turbine unit; (2) the 400V power switch of the diesel generator The switching mode and the pentagonal wiring system of the step-up station belong to the new black start test system; (3) For small hydroelectric units, it has not been seen that the water-type hydroelectric motor restores the usual electric load of the hydro-generator when charging the line. The method of charging the line after the island runs; (4) The common black start test sends out the test after the line is charged, and the test is completed after the line is charged, and it is not connected to the grid with other lines through the synchronization method

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