Generator Power Feedback Control for Fast Load Sharing
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Solution Overview
Problem
Existing closed-loop control systems for power assemblies, comprising an internal combustion engine and a generator, suffer from inherent instability and delayed response due to using dynamic variables like speed or frequency, which is exacerbated in island or grid parallel operations, leading to inefficient load distribution.
Innovation Solution
A closed-loop control device that detects generator power as a controlled variable, determines a control deviation, and calculates target torque using a control rule based on a predetermined loop gain, allowing for direct manipulation of the internal combustion engine to quickly adapt to load changes, thereby improving dynamic control and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If speed or generator frequency is used as controlled variable for closed-loop control, then the control system can maintain basic operation, but the response to load changes is delayed and the system becomes less robust
Solution Approach 1:
The patent changes the controlled variable from speed or frequency to generator power. This parameter change enables direct detection of load changes through power measurements, eliminating the delay inherent in speed-based control. The control deviation is calculated based on power difference rather than speed difference, providing immediate response to load variations.
2Reliability
If dynamic variables like speed are used for closed-loop control, then the control process can function, but the system becomes intrinsically less robust with detrimental effects on steady-state control behavior
Solution Approach 1:
The patent implements feedback based on generator power measurements rather than speed measurements. The control deviation is determined from the difference between actual and target generator power, creating a robust feedback loop that directly responds to power imbalances. This feedback mechanism improves steady-state control behavior by eliminating the inherent instability of speed-based control systems.
3Loss of time
If speed controller reacts only after speed drop is detected, then the control logic remains simple, but an unavoidable delay occurs in responding to power changes
Solution Approach 1:
The patent performs preliminary detection of load changes by monitoring generator power before speed changes occur. Since power changes are detected immediately through electrical measurements while speed changes lag, the control system can initiate corrective action earlier. The control deviation is calculated based on power difference, enabling preliminary response to load variations.
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 operatively connected in terms of drive 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; ascertaining a control deviation (eP) as a difference between the generator power (PG) which is detected and a target generator power (Ptarget); determining a target torque (Mtarget) as a manipulated variable for actuating the internal combustion engine as a function of the control deviation (eP); using a control rule to determine the target torque (Mtarget); and determining the control rule used to determine the target torque (Mtarget) as a function of a predetermined loop gain (vP).