Gas Turbine Control Device for Rapid Frequency Reduction
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Solution Overview
Problem
Existing control devices for gas turbines struggle to reduce the rotational frequency of the gas turbine in a short time when the output power is decreased, leading to inefficiencies and potential overcharging of batteries due to excess power generation.
Innovation Solution
A control device for a power unit system that includes a gas turbine, generator, battery, required power setting unit, fuel injection amount setting unit, and condition determination unit, which adjusts fuel injection and power settings to reduce output power and rotational frequency in a controlled manner, using first and second output power reduction controls based on predetermined conditions to optimize power and frequency alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output power of the gas turbine is reduced, then the battery overcharge problem is solved, but the rotational frequency cannot be reduced quickly enough
Solution Approach 1:
The control method segments the power reduction process into two distinct phases: first reducing output power while maintaining rotational frequency, then reducing rotational frequency while maintaining output power. This segmentation allows each parameter to be controlled independently, solving the contradiction by preventing battery overcharge in the first phase and enabling quick frequency reduction in the second phase.
Solution Approach 2:
The control device performs preliminary action by first reducing the output power to match the target power before reducing the rotational frequency. This preliminary power reduction prevents battery overcharge from occurring, and then the subsequent frequency reduction can proceed quickly without causing power mismatch issues.
2Loss of time
If the rotational frequency is reduced quickly, then the response time is improved, but the output power control becomes unstable
Solution Approach 1:
The control process is segmented into two sequential stages: Stage 1 reduces output power while maintaining rotational frequency at a stable level, and Stage 2 reduces rotational frequency while maintaining output power. This segmentation ensures that quick frequency reduction occurs only after power stability is established, resolving the contradiction between response time and stability.
Solution Approach 2:
The control strategy dynamically adjusts which parameter (power or frequency) is reduced based on the current operational phase. In the first phase, power is dynamically reduced while frequency remains stable; in the second phase, frequency is dynamically reduced while power is maintained. This dynamic approach allows quick response when appropriate while maintaining stability during critical transitions.
3Reliability
If the output power is reduced to match target power first, then battery overcharge is prevented, but the rotational frequency reduction is delayed
Solution Approach 1:
The control method segments the reduction process into two phases: Phase 1 focuses on power matching by reducing output power while maintaining frequency, preventing battery overcharge; Phase 2 focuses on frequency reduction by reducing rotational frequency while maintaining power. This segmentation resolves the contradiction by ensuring power matching accuracy in Phase 1 and enabling subsequent quick frequency reduction in Phase 2 without delay.
Solution Approach 2:
The control device performs preliminary power reduction to achieve accurate power matching before initiating frequency reduction. This preliminary action ensures that power is already matched to target levels, preventing battery overcharge, and then allows frequency to be reduced quickly in the subsequent phase without causing power instability or delays.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables rapid reduction of gas turbine rotational frequency when output power is decreased, thereby reducing surplus electric power generation and preventing battery overcharge, allowing for a smaller battery capacity and improved system efficiency.
Implementation Method 1
a generator that is driven by the gas turbine
Implementation Method 2
a battery that stores electric power generated by the generator
Implementation Method 3
a gas turbine that includes a compressor and a turbine rotating together with the compressor
Implementation Method 4
fuel to be injected into a combustion chamber of the gas turbine
Data Source
AI summary
When the output power of a gas turbine is going to be reduced and when the relationship between the target output power and the rotational frequency of the gas turbine satisfies predetermined conditions, a control device of a power unit system reduces the output power of the gas turbine to the target output power and thereafter reduces the rotational frequency of the gas turbine to the target rotational frequency, whereas when the relationship between the target output power and the rotational frequency of the gas turbine does not satisfy the predetermined conditions, the control device reduces the rotational frequency of the gas turbine to the target rotational frequency and thereafter reduces the output power of the gas turbine to the target output power.