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The "regulation resonance" phenomenon in control systems and optimization schemes
Yongwei Chen1, Yongjing Xie1, Dailun You1
1China Nuclear Power Operation Co., Ltd, China.
ISA Transactions
|July 16, 2019
Summary
Steam generator water level control systems can oscillate due to resonance. This study identifies frequency and phase difference as key causes, proposing parameter optimization, phase adjustment, and dead-band settings to improve stability.
Area of Science:
- Nuclear Engineering
- Control Systems Engineering
Background:
- Steam generator water level control involves independent pump speed and valve position systems with reciprocal influence.
- A significant challenge is the oscillation of regulated variables in control actuators, even under stable operating conditions.
Purpose of the Study:
- To investigate and analyze the pervasive regulating resonance phenomenon in steam generator water level control.
- To identify the primary factors causing this resonance and propose optimization strategies.
Main Methods:
- Simulation of real working conditions to inspect the regulating resonance phenomenon.
- Utilizing a mathematical model of the main water feed flow to analyze the causes of resonance.
Main Results:
- The study reveals that frequency characteristics of the control system and the phase difference are the direct causes of the regulation resonance phenomenon.
- Oscillations with large amplitudes were observed in regulated variables under stable conditions.
Conclusions:
- Optimizing regulation parameters, adjusting the phase difference, and implementing a regulation dead-band are proposed as effective schemes.
- These strategies aim to enhance the stability of the steam generator water level control system.