Engine-Generator Control Using Combined Power and Frequency Feedback
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Solution Overview
Problem
Existing closed-loop control systems for power assemblies with internal combustion engines and generators face challenges in simultaneously achieving good load switching behavior and robust, stable control of both generator power and frequency, especially when controlling two different variables.
Innovation Solution
A closed-loop control device that combines power and frequency control deviations to form an overall preset variable, using a preselection module to determine a third preset variable for controlling the internal combustion engine, thereby enabling dynamic load switching and robust control of both generator power and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both generator power and generator frequency are controlled simultaneously, then comprehensive control of power assembly is improved, but control stability and load switching behavior deteriorate
Solution Approach 1:
The control system is segmented into two independent controllers: a power controller that detects generator power and determines a first preset variable, and a frequency controller that detects generator frequency and determines a second preset variable. This segmentation allows each controller to independently manage its respective parameter without interfering with the other, thus maintaining control stability while achieving comprehensive control of both power and frequency.
Solution Approach 2:
The first preset variable from the power controller and the second preset variable from the frequency controller are merged through an offset operation to form an overall preset variable. This overall preset variable is then used to control the internal combustion engine, combining the effects of both power and frequency control into a unified control signal that maintains system stability.
2Device complexity
If traditional separate control of power and frequency is used, then control simplicity is maintained, but load switching behavior and response speed worsen
Solution Approach 1:
The preselection module determines a third preset variable as a preselection variable for controlling the internal combustion engine before the final control action is executed. This preliminary determination of the third preset variable allows the system to proactively prepare control parameters, enabling faster response to load changes without waiting for the complete control cycle to finish.
Solution Approach 2:
The system dynamically adjusts the overall preset variable by offsetting the first preset variable, second preset variable, and third preset variable in real-time based on current operating conditions. This dynamic adjustment allows the control system to adapt quickly to changing load requirements, significantly improving load switching behavior and response speed compared to static separate control.
Data Source
AI summary
A closed-loop control device includes:a power controller for:detecting a generator power of a generator as a controlled variable,determining a power control deviation as a difference between the detected generator power and a target generator power; anddetermining a first preset variable as a function of the power control deviation;a frequency controller for:detecting a generator frequency of the generator as a controlled variable,determining a frequency control deviation as a difference between the detected generator frequency and a target generator frequency;determining a second preset variable as a function of the frequency control deviation; anda preselection module for determining a third preset variable,the closed-loop control device for:combining the first preset variable, the second preset variable, and the third preset variable with one another to form an overall preset variable; andusing the overall preset variable for controlling an internal combustion engine.