Method for carrying out black start through extra-high voltage alternating current power station by using external power supply

Abstract

The invention discloses a method for performing black start by using an external power supply through an extra-high voltage alternating-current power station. The method comprises the following steps of: 1, inputting corresponding reactive equipment in a high-voltage transformer substation when a power grid is completely black so as to suppress load shedding overvoltage at the tail end of an extra-high voltage line; 2, according to the ultra-high-voltage alternating-current line to be recovered, an overcompensation mode is adopted to prevent line overvoltage; 3, gradually and sequentially recovering the ultrahigh-voltage alternating-current line according to the step 2 until the high-voltage bus of the to-be-started power plant is recovered to be charged; 4, the excitation inrush current, the power frequency and the operation overvoltage during idle charging of the boosting main transformer are verified, and if no risk exists, the boosting main transformer is charged; and step 5, calculating required reactive compensation according to the station load to be recovered, and if no voltage frequency risk exists, recovering the station load and then immediately putting the unit into output. According to the invention, the black start recovery process of the system is accelerated by utilizing the characteristics of high power supply capacity and high speed of the extra-high voltage alternating current, and the power failure loss caused by overlong black start time is reduced.

Description

technical field [0001] The invention relates to a black start process of a power grid completely shutting down after a serious failure of a power system, in particular to a black start method for an extra-high voltage AC power station using an external power supply. Background technique [0002] When the regional power system has a large-scale blackout due to an accident, the power grid is in a completely black state. In order to quickly restore load power supply, reduce economic losses and ensure social stability, it is necessary to immediately black start the power grid. Black start is the last line of defense for the safe operation of the power system. Making good use of various types of power supplies with self-starting capabilities for black start of the entire network is of great significance to speeding up the recovery process after the system blackout accident and stabilizing the national economy. [0003] In order to speed up the recovery after the blackout of the s...

AI Technical Summary

Problems solved by technology

However, the 1000kV Jindongnan-Nanyang-Jingmen UHV AC line between China's North China and Central China power grids did not participate in the black start process in the preparation of the black start scheme for the North China Power Grid and the Central China Power Grid, and the black start power resources were not maximized.

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