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Research on Control Method of Waste Heat Utilization System Based on Multi-parameter Coupling.

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This study introduces a new control system for low-quality waste heat power generation devices. The system effectively stabilizes rotational speed, improving energy recovery and meeting power fluctuation requirements.

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Area of Science:

  • Energy Engineering
  • Thermodynamics
  • Control Systems

Background:

  • Low-quality waste heat recovery is crucial for energy efficiency but faces challenges in stable power generation.
  • Existing devices with Roots power machines struggle with speed adjustment and variable coupling, limiting performance.
  • A 10 kW power output with a ±7% fluctuation tolerance is a key target for practical application.

Purpose of the Study:

  • To design and implement an advanced control system for a low-quality waste heat power generation device.
  • To address the strong coupling and instability issues inherent in Roots machine-based systems.
  • To achieve stable rotational speed and meet specific power output fluctuation requirements.

Main Methods:

  • Development of a coupled mathematical model for system variables.
  • Introduction of nonlinear multi-model adaptive closed-loop decoupling control.
  • Design and simulation of a novel control system architecture.

Main Results:

  • Simulation demonstrated a maximum overshoot of 3.9% and reduced adjustment time.
  • Experimental results confirmed stable rotational speed for the Roots motor, within ±21.4 r/min deviation.
  • The system successfully maintained power output within the required ±7% fluctuation range.

Conclusions:

  • The developed control system effectively stabilizes the low-quality waste heat recovery device.
  • This research provides a foundation for future grid-connected power generation from waste heat.
  • The nonlinear multi-model adaptive control strategy overcomes strong coupling issues in such systems.