Gas Turbine Control Device for Rapid Output Increase
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Solution Overview
Problem
Gas turbines face challenges in rapidly increasing output while preventing excessive turbine inlet temperature, which can lead to damage if the temperature exceeds design limits.
Innovation Solution
A control device for gas turbines that calculates a control target value greater than the output demand value until a threshold is reached, then decreases it to suppress fuel flow and prevent overheating, using a bias value adjustment based on conditions such as turbine inlet temperature and valve openings to optimize fuel command values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fuel flow rate is increased rapidly to increase gas turbine output quickly, then the output increase speed is improved, but the turbine inlet temperature increases excessively causing potential damage
Solution Approach 1:
The control device performs preliminary actions by increasing the control target value before the actual output reaches the demand value. Specifically, when the difference between demand and actual output is within a threshold range, the control target value is set to be higher than the demand value, preparing the system to respond quickly while preventing temperature excess through proactive control adjustment
Solution Approach 2:
The control target value is dynamically adjusted based on the difference between demand and actual output. The system transitions from a static target value to a dynamic one that changes according to real-time operating conditions, allowing the control target to increase before the threshold is reached and then decrease afterward, optimizing both response speed and temperature control
2Ease of operation
If the control target value is set higher than demand value to improve responsiveness, then control responsiveness is improved, but fuel command value may become excessive causing temperature control issues
Solution Approach 1:
The control device uses feedback mechanisms where the actual output is continuously monitored and compared with the demand value. Based on this feedback, the control target value is adjusted - increasing it when the difference is within the threshold to improve responsiveness, and decreasing it when the difference exceeds the threshold to maintain temperature control accuracy
Solution Approach 2:
The control target value parameter is changed dynamically based on operating conditions. The system changes the control target value from a fixed parameter to a variable parameter that adapts to real-time differences between demand and actual output, allowing optimization of both responsiveness and temperature control through parameter adjustment
Data Source
AI summary
A control device for a gas turbine include: a target value calculation part configured to calculate a control target value being a target value of an output of the gas turbine; anda command value calculation part configured to calculate a fuel command value on the basis of a deviation between the control target value and an actual output value of the gas turbine. The target value calculation part is configured to: set the control target value to a value which is greater than an output demand value of the gas turbine immediately before a difference between the output demand value and the actual output value becomes not greater than a threshold; and subtract the control target value from the value after the difference becomes not greater than the threshold.