Generator Frequency Control for Robust Engine-Generator Assemblies
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Solution Overview
Problem
Existing closed-loop control devices for power assemblies with internal combustion engines and generators have dynamic variables that lead to less robust control, particularly affecting steady-state behavior and requiring complex adaptations for different power assemblies.
Innovation Solution
A closed-loop control device that uses generator frequency as a controlled variable, determining a control deviation and target torque as a manipulated variable, with an adaptable control rule based on adaptation variables like generator frequency, target torque, and power, allowing for consistent loop gain across operating points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If speed of internal combustion engine is used as controlled variable, then direct engine control is achieved, but control robustness deteriorates and steady-state behavior worsens
Solution Approach 1:
The patent introduces generator frequency as an intermediary controlled variable between engine speed and load control. Instead of directly controlling engine speed, the system controls generator frequency which indirectly regulates engine operation, providing better damping and reduced torsional vibrations while maintaining control effectiveness
Solution Approach 2:
The patent changes the controlled parameter from engine speed to generator frequency. This parameter transformation exploits the generator's higher moment of inertia and quieter dynamic characteristics, resulting in improved control robustness and steady-state behavior while maintaining the ability to regulate power output
2Reliability
If generator frequency is used as controlled variable, then control robustness and steady-state behavior improve, but control complexity increases due to adaptable control rule
Solution Approach 1:
The patent implements a dynamically adaptable control rule that adjusts control parameters based on operating conditions. The control rule modifies its characteristics according to adaptation variables such as generator frequency, target torque, and power output, enabling the system to maintain optimal performance across different operating points without requiring complex manual tuning
Solution Approach 2:
The control system performs self-adjustment through the adaptable control rule that automatically modifies its parameters based on real-time operating conditions. This self-service capability eliminates the need for external tuning and adaptation for different power assemblies, reducing overall system complexity despite the sophisticated control strategy
3Reliability
If standard controller parameters are used, then robustness improves, but adaptability to different power assemblies deteriorates
Solution Approach 1:
The control rule is designed to dynamically adapt to different power assemblies by using adaptation variables (generator frequency, target torque, power) that capture the specific characteristics of each configuration. This dynamic adaptation allows standard controller parameters to work across different assemblies without requiring assembly-specific tuning
Solution Approach 2:
The patent creates a universal control solution where the adaptable control rule can be applied to different power assemblies with varying characteristics. By incorporating adaptation mechanisms that respond to operating conditions rather than assembly-specific parameters, the same controller can effectively manage diverse configurations without losing robustness
Data Source
AI summary
A closed-loop control device includes: the closed-loop control device which is configured for: detecting a generator frequency (fG) of the generator as a controlled variable; determining a control deviation (ef) as a difference between the generator frequency (fG) which is detected and a target generator frequency (fsoll); determining a target torque (Msoll) as a manipulated variable for controlling an internal combustion engine as a function of the control deviation (ef); using a control rule for determining the target torque (Msoll); and adapting the control rule—which is used to determine the target torque (Msoll)—as a function of at least one adaptation variable, the at least one adaptation variable being selected from a group consisting of the generator frequency (fG) which is detected, a target torque variable, and a generator power.