System and method for adjusting combustion stability of gas turbine

The invention provides a system and a method for adjusting the combustion stability of a gas turbine. The system comprises an exhaust pipeline, a control valve, a temperature sensor and a control system; the air inlet end of the exhaust pipeline communicates with the interior of an air compressor of the gas turbine; the air outlet end of the exhaust pipeline communicates with a turbine exhaust diffusion section of the gas turbine; the control valve is arranged on the exhaust pipeline and is used for controlling the flow of gas entering the turbine exhaust diffusion section; the temperature sensor is arranged on the turbine exhaust diffusion section and is used for collecting the exhaust temperature in the turbine exhaust diffusion section; and the control system is connected with the control valve and the temperature sensor. According to the system and the method, the temperature of smoke exhausted by the gas turbine can be reduced, the opening degree of the control valve is controlledto ensure that the tempe