Generator Control Mode Switching for Engine Load Impact Recovery
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Solution Overview
Problem
Existing power supply systems struggle to manage sudden load impacts on large engines with turbochargers, leading to engine speed drops and difficulties in recovering transient performances.
Innovation Solution
A controller with multiple control modes is introduced, where the generator is feedback-controlled based on engine speed and independently of output voltage during load impacts, minimizing the torque peak applied to the engine and enhancing recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the AVR increases exciter current to compensate for voltage decrease under load, then the alternator can supply current to the load, but the engine speed drops due to increased torque demand
Solution Approach 1:
The controller detects a load impact event and proactively switches to the second control mode before the engine speed drops too much. This preliminary action allows the system to prepare for the speed drop by changing control strategy, thereby minimizing the actual speed drop and improving transient recovery performance
Solution Approach 2:
The controller dynamically switches between two control modes based on operating conditions. In the first mode, voltage feedback control is used for normal operation. In the second mode, during load impacts, the control is based on engine speed feedback or independent of output voltage. This dynamic adaptation resolves the contradiction by adjusting the control strategy to prioritize engine speed maintenance during transient events
2Stability of the object's composition
If the engine controller maintains target speed through feedback control, then speed stability is improved, but the engine cannot respond quickly enough to sudden load demands due to hardware and emissions limitations
Solution Approach 1:
The controller detects load impact events and switches to a special control mode in advance, preparing the system for the upcoming speed disturbance. This allows the engine to respond more quickly to sudden load demands without compromising normal speed stability during steady-state operation
Solution Approach 2:
The controller changes the control parameters dynamically by switching between different control modes. During normal operation, voltage feedback control parameters are used for stability. During load impacts, the system switches to speed-based or independent control parameters that enable faster response, thus resolving the contradiction between stability and response speed
3Reliability
If the AVR applies an unload factor to decrease voltage target and let time for air mass flow increase, then engine stalling is prevented, but transient performance recovery is slow for large engines with turbochargers
Solution Approach 1:
The controller detects load impact events and switches to the second control mode proactively, before the engine speed drops below critical thresholds. This preliminary action prevents the need for aggressive unload factors that would extend recovery time, allowing the engine to maintain better speed and recover faster while still preventing stalling
Solution Approach 2:
The controller changes the control strategy parameters during transient events by switching between control modes. Instead of applying a fixed unload factor that slows recovery, the system dynamically adjusts to speed-based control that maintains better engine response, thus reducing transient recovery time while maintaining reliability
Data Source
AI summary
The present disclosure comprises a controller for controlling an electrical power supply system, the electrical power supply system comprising a generator for generating electrical energy and an engine for driving the generator, wherein the controller comprises a first control mode in which the generator is feedback-controlled on the basis a difference between an output voltage produced by the generator and a target voltage. The controller further comprises at least a second control mode in which the generator is feedback-controlled on the basis of engine speed and/or independently of output voltage.