Excitation mode of gas turbine

Abstract

The invention discloses an excitation mode of a gas turbine. The mode comprises the steps: replacing a low-voltage excitation transformer TG of the gas turbine with a low-voltage excitation transformer TG1, wherein the low-voltage excitation transformer TG1 is a primary side double-tap excitation transformer; arranging a circuit breaker Z1 additionally at the secondary side output end of the high-voltage exciting transformer TL, and enabling the high-voltage exciting transformer TL to be connected to a primary side tap 1 of the low-voltage exciting transformer TG through the circuit breaker Z1, wherein the voltage of the primary side tap 1 is 300V; transforming the voltage by the low-voltage exciting transformer TG1 and then providing a self-shunt excitation power supply; in addition, leading a path of auxiliary power to serve as a separate excitation power supply, and connecting the separate excitation power supply to a primary side tap 2 of the low-voltage exciting transformer TG1 through a circuit breaker T1, wherein the voltage of the primary side tap 2 is 380V, and the secondary excitation power supply is provided after the voltage transformation of the primary side tap 2 through the low-voltage exciting transformer TG1. The method has the advantages that an excitation mode of rapidly switching from self-shunt excitation to station service separate excitation is provided, when the self-shunt excitation system of the gas turbine unit breaks down, the station service separate excitation mode can be switched within a short time, and the operation reliability of the unit is effectively improved.

Description

technical field [0001] The invention relates to the technical field of gas power generation, in particular to an excitation method of a gas turbine. Background technique [0002] Gas-fired power generation is the process of using natural gas or other combustible gases to generate electricity. A gas turbine is a rotating machine that converts heat energy into mechanical work, including compressors, equipment for heating working fluid, turbines, control systems and auxiliary equipment, etc. Air is generally used as a working medium. [0003] Since the gas turbine entered the power generation industry stage in the 1950s, its power generation efficiency and thermal efficiency have been greatly improved, especially the gas-steam combined cycle unit is becoming more and more mature. The single unit power of the gas turbine has exceeded 334MW, and the thermal efficiency has reached 35%. 41.92%, while the unit power of the combined cycle unit has reached 489.3MW, and the thermal ef...

AI Technical Summary

Problems solved by technology

However, once the high-voltage excitation transformer at the generator end fails, it usually takes a long time for maintenance, which directly affects the operation of the unit.

And the 9E gas turbine is usually used as a peak-shaving unit, and the peak-shaving of the power grid is carried out through the start-up and shutdown units, so frequent start-up and stop-off have a great impact on the life of related electrical equipment

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