Gas turbine fuel pressure control method and gas turbine fuel pressure control system

Abstract

The invention relates to a gas turbine fuel pressure control method and a gas turbine fuel pressure control system. The method comprises the following steps: S1. comparing a pressure reference value with a pressure measured value to obtain a pressure error, and carrying out differential operation on the pressure error to obtain a change rate of the error; S2. carrying out blurring operation on the error and the change rate of the error to obtain a PID parameter variation; S3. correcting an original PID parameter value according to the PID parameter variation to obtain a corrected PID parameter value; S4. carrying out PID operation according to the corrected PID parameter value to obtain target valve opening; and S5. regulating the opening degree of a speed ratio valve according to the target valve opening and actual valve opening. By combining blurring control with PID, the adaptability and the robustness of pressure control are improved, the parameter self-tuning is achieved, and when control parameters in a gas turbine are changed, the pressure of the gas turbine still can be regulated accurately, so that a good control effect can be obtained.

Description

technical field [0001] The invention relates to the technical field of gas turbines, in particular to a gas turbine pressure control method and a gas turbine pressure control system. Background technique [0002] The gas turbine is an impeller-type power machine that uses gas and liquid as fuel to convert the heat released during fuel combustion into useful work and can rotate at high speed. It controls the increase or decrease of the speed and load by changing the amount of fuel. The adjustment of the fuel volume is accomplished through the speed ratio valve and the control valve. The speed ratio valve adjusts the pressure, and the control valve adjusts the flow. In order to adjust the flow into the combustion chamber only by changing the opening of the control valve after full speed and no load, the pressure before the control valve should be kept constant, that is, the speed ratio valve should be adjusted to keep the fuel pressure behind the valve constant. [0003] Sin...

AI Technical Summary

Problems solved by technology

[0003] Since the gas turbine control system is a multi-variable, strong interference and parameter time-varying system, at the same time, in the process of tuning the traditional PID parameters, its setting value has the optimal value in a certain area, not the global optimal value, so it cannot be obtained from Actually solve the contradiction between dynamic quality and steady-state accuracy

Therefore, in the fuel pressure control system, the traditional PID control will not be able to achieve the ideal control effect

Images