Gas Turbine Controller Adaptive Fuel Flow Transient Load
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Solution Overview
Problem
Conventional gas turbine controllers are limited by conservative control methods that restrict transient events such as load acceptance and load rejection, preventing efficient and accurate adjustments in power output during these events.
Innovation Solution
A method and controller for gas turbines that adapt air and fuel mass flow rates within specific thresholds to manage load changes, using a closed-loop control system that adjusts compressor air flow and fuel supply based on model-based parameters like compressor surge and lean blowout limits, enabling more robust and precise control during transient events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative control methods are used, then safety margins are maintained, but transient load acceptance and rejection capabilities are restricted
Solution Approach 1:
The control system dynamically adjusts air and fuel mass flow rates based on real-time operating conditions and model-based predictions, transitioning from static conservative control to adaptive dynamic control that optimizes performance while maintaining safety
Solution Approach 2:
The system changes control parameters (air mass flow rate, fuel mass flow rate) within dynamically determined thresholds based on model-based parameters such as compressor surge margin and lean blowout margin, allowing flexible adjustment of load acceptance and rejection capabilities
2Productivity
If model-based control with dynamic thresholds is implemented, then transient performance is improved, but control system complexity increases
Solution Approach 1:
The control system uses feedback from model-based calculations of compressor surge margin and lean blowout margin to dynamically adjust air and fuel mass flow rates, creating a closed-loop control system that improves transient performance through continuous monitoring and adjustment
Solution Approach 2:
The system performs preliminary model-based calculations to determine safe operating thresholds before executing load changes, predicting compressor surge and lean blowout conditions in advance to guide control actions within safe boundaries
Data Source
AI summary
A controller for a gas turbine wherein the gas turbine includes the compressor arranged to operate at a rotational speed n, the combustor and the fuel supply includes the first fuel supply and the second fuel supply, wherein the compressor is arranged to provide air to the combustor at a steady state air mass flow rate mss and wherein the fuel supply is arranged to supply fuel at a fuel mass flow rate mtotal to the combustor. The controller is arranged to, responsive to the load change ΔL to the load L, control the fuel supply to supply a proportion Z of the fuel mass flow rate mtotal as a fuel mass flow rate mfuel pilot via the first fuel supply based, at least in part, on a combustor mass flow rate mt.