Closed-Loop Control Device for Power Assembly Frequency Stability
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Solution Overview
Problem
Existing closed-loop control devices for power assemblies comprising internal combustion engines and generators are inherently less robust due to the dynamic nature of the controlled variables, leading to suboptimal steady-state control behavior and requiring specific parameterization for each power assembly.
Innovation Solution
A closed-loop control device that detects the generator frequency as a controlled variable, calculates a control deviation, and determines a target speed for the internal combustion engine using a control rule, thereby providing a robust frequency control system that can adjust to deviations without needing separate parameterization for each power assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a dynamic variable is used for closed-loop control of generator frequency, then the control system can respond to changes, but the control becomes less robust and steady-state behavior deteriorates
Solution Approach 1:
The patent implements a dual-mode control system that dynamically switches between open-loop control for transient response and closed-loop control for steady-state accuracy. The control device detects whether the power assembly is in transient or steady-state operation and activates the appropriate control mode, thereby achieving both rapid response and robust steady-state frequency control without the drawbacks of using purely dynamic control variables.
2Reliability
If a speed controller is parameterized for closed-loop control of generator frequency, then frequency control is achieved, but separate adaptation is required for each specific power assembly
Solution Approach 1:
The control device is designed with a universal control algorithm that automatically adapts to different power assembly configurations. Instead of requiring separate parameterization for each power assembly, the device uses a standardized interface and self-adjusting control logic that works across multiple applications. The control device can function as either a speed controller or frequency controller depending on the operational mode, eliminating the need for dedicated parameter sets for each specific power assembly configuration.
Data Source
AI summary
A closed-loop control device, for closed-loop control of a power assembly including an internal combustion engine and a generator having an operative drive connection to the internal combustion engine, includes:the closed-loop control device which is configured, in a first functional state, 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 speed (nsoll) as a manipulated variable for controlling the internal combustion engine as a function of the control deviation (ef);using a control rule for determining the target speed (nsoll); andbeing operatively connected to an open-loop control device of the internal combustion engine in such a way that the target speed (nsoll) can be transmitted by the closed-loop control device to an open-loop control device.