Method for restraining rotation speed fluctuation of gas turbine power generation system in case of sudden load change

Abstract

The invention discloses a method for restraining rotation speed fluctuation of a gas turbine power generation system in the case of sudden load change. On the basis of a control strategy of a 'voltageclosed loop and current closed loop' of a generator and a rectification control subsystem of the generator, the fluctuation amount of the rotating speed of an output shaft of the gas turbine is usedas the disturbance quantity to be compensated into voltage closed-loop control of the generator, the direct-current voltage valued output by the generator and the rectification control subsystem of the generator are changed, the variable quantity of the load power is adjusted when load on the gas turbine power generation system is suddenly changed, so that fluctuation of the rotating speed of a unit can be quickly restrained, and then stable operation of the gas turbine power generation system can be realized.

Description

technical field [0001] The invention relates to a method for coordinated control of a gas turbine power generation system, in particular to a method for suppressing rotation speed fluctuations of a gas turbine and its control subsystem. Background technique [0002] At present, gas turbines have been widely used in the fields of aero-engines, ground power stations, ship integrated power systems, and aviation auxiliary power supplies. Especially when it is applied to isolated grid operation power systems such as ship integrated power system and aviation auxiliary power supply, the total capacity of the generator set is equivalent to the load power. The gas turbine control unit mainly includes two parts: the power turbine controller and the gas turbine controller, which are used to realize the closed-loop control of the output shaft speed of the gas turbine. figure 1 It is a block diagram of a traditional cascade closed-loop control system for a gas turbine. The power turbin...

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Problems solved by technology

[0007] In order to overcome the shortcomings of the existing gas turbine power generation system load mutation caused by the fluctuation of the speed of the gas turbine output shaft, and affect the stability of the closed-loop control of the speed of the gas turbine control unit, thereby affecting the quality of power output by the generator and its rectification control subsystem, the present invention proposes a A gas turbine power generation system load mutation speed fluctuation suppression method, the invention does not need additional hardware detection circuit, and does not need complex algorithms, on the basis of not changing the control strategy in the gas turbine control unit, by changing the output of the generator and its rectification control subsystem The DC voltage characteristics of the generator and its rectification control subsystem can be adjusted to adjust the output load power variation, so as to quickly suppress the fluctuation of the output shaft speed of the gas turbine when the load changes suddenly.

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