Compressor Fuel Gas Control Device for Rapid Load Stabilization
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Solution Overview
Problem
Existing fuel gas supply systems face challenges in stabilizing pressure during rapid load variations, such as load interruptions or tripping, leading to overshoot and undershoot, and require time to achieve stability.
Innovation Solution
A control device and method that utilize a combination of feedforward and feedback control mechanisms, including a main pressure control unit and an inlet pressure control unit, to regulate the inflow amount, anti-surge valve, and inlet pressure control valve, using first and second feedforward control values based on load variations and conversion processes, with additional corrections for state quantities and bias values to rapidly stabilize pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback control is used to maintain compressor discharge pressure, then pressure stability is improved under normal operation, but response speed deteriorates during rapid load variation
Solution Approach 1:
The system performs preliminary action by calculating feedforward control values based on anticipated load variations before they actually affect the compressor discharge pressure. The control device uses the load variation notification signal to trigger feedforward control, which proactively adjusts the inlet guide vane and anti-surge valve to counteract upcoming pressure changes, thereby improving response speed during rapid load variation while maintaining pressure stability.
2Device complexity
If only feedback control is used, then control simplicity is maintained, but control precision deteriorates during rapid load variation causing overshoot and undershoot
Solution Approach 1:
The system merges feedforward control and feedback control into a unified control mechanism. The control device combines the feedforward control value (based on load variation prediction) with the feedback control value (based on actual pressure deviation) to generate the final control output. This combination allows the system to maintain control simplicity while achieving high control precision during rapid load variation, eliminating overshoot and undershoot by anticipating and compensating for pressure changes before they occur.
3Speed
If feedforward control is added to improve response speed, then response speed is improved, but device complexity increases
Solution Approach 1:
The system introduces an intermediary element - the load variation notification signal - that mediates between the load apparatus and the compressor control system. This notification signal triggers the feedforward control mechanism, allowing the system to achieve improved response speed without requiring complex continuous monitoring and calculation systems. The intermediary signal simplifies the activation of feedforward control, making the overall device complexity manageable while maintaining fast response capabilities.
Data Source
AI summary
A control device that controls a fuel gas supply system that has: a compressor that supplies compressed fuel gas to a load apparatus; an inflow amount regulating means that regulates the amount of fuel gas that flows into the compressor; an anti-surge valve that is for returning to an inlet side of the compressor fuel gas that is discharged from the compressor; and an inlet pressure-regulating valve that regulates the pressure of fuel gas supplied toward the inflow amount regulating means. The control device includes: a main pressure-regulating unit that controls the inflow amount regulating means and the anti-surge valve using a first feedforward control value that is generated on the basis of the load of the load apparatus and of a first conversion process and using a feedback control value that is generated on the basis of the deviation between a set value and a measured value for the discharge pressure of the compressor; and an inlet pressure-regulating unit that controls the inlet pressure-regulating valve using a second feedforward control value that is generated on the basis of the load of the load apparatus and of a second conversion process.