Closed-Loop Control Device for Power Assemblies
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Solution Overview
Problem
Existing closed-loop control systems for power assemblies comprising internal combustion engines and generators are inherently less robust due to the dynamic nature of the variables used, leading to challenges in steady-state control and requiring specific parameterization for each power assembly, especially in island or grid parallel operations.
Innovation Solution
A closed-loop control device that detects generator power as a controlled variable, calculates a control deviation, and determines a target speed for the internal combustion engine using a control rule, which is adapted based on detected generator power, generator frequency, droop variable, and target torque variables, allowing for robust power control without the need for specific parameterization for each power assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic variables are used for closed-loop control of generator frequency, then the control system can respond to changing conditions, but the control becomes less robust and requires special parameterization for each power assembly
Solution Approach 1:
The patent changes the controlled variable from dynamic speed/frequency to static generator power, and introduces a control rule that adapts parameters based on operating conditions. The control rule modifies the proportional coefficient based on generator power, frequency, droop variable, and target torque, enabling robust control across different power assembly configurations without requiring separate parameterization for each system.
2Reliability
If separate parameterization is performed for each speed controller of each power assembly, then the control can be optimized for specific conditions, but the complexity and adaptation effort increase significantly
Solution Approach 1:
The patent creates a universal closed-loop control device that can be applied to different power assemblies without requiring separate parameterization. The control rule is designed to work across multiple power assembly configurations (island parallel operation, grid parallel operation) by automatically adapting to different operating conditions through the proportional coefficient modification based on generator power, frequency, droop variable, and target torque.
3Reliability
If speed controllers are optimized for specific power assembly configurations, then control performance improves, but the system becomes less flexible for different operating modes
Solution Approach 1:
The patent introduces dynamic adaptation through the control rule that modifies the proportional coefficient based on real-time operating conditions. The system automatically adjusts control parameters according to generator power, frequency, droop variable, and target torque, enabling the same control device to maintain optimal performance across different operating modes (island parallel, grid parallel) without manual reparameterization.
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 for: detecting a generator power (PG) of the generator as a controlled variable; determining a control deviation (eP) as a difference between the generator power (PG) which is detected and a target generator power (Psoll); determining a target speed (nsoll) as a manipulated variable for controlling the internal combustion engine as a function of the control deviation (eP); using a control rule for determining the target speed (nsoll); and being 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 the open-loop control device.