Modular Generator Load Sharing via Dynamic Decoupling Control
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Solution Overview
Problem
Conventional control methods for modular generators with interleaved three-phase windings are insufficient in managing dynamic torque or power sharing due to significant magnetic coupling between systems, leading to instability and reduced reliability.
Innovation Solution
A dynamic decoupling control method is implemented using a torque/power scheduler that limits slope changes and introduces fixed time delays to prevent simultaneous changes in torque or power reference signals across three-phase systems, coupled with rotor flux linkage and angular shift identification from back electromotive force measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current feedback field oriented control is used in modular generators with interleaved windings, then the control structure is simple, but the magnetic coupling between three phase systems causes instability and poor load sharing
Solution Approach 1:
The patent segments the control of each three-phase system into independent control modules, where each module controls one set of three-phase windings. This segmentation allows independent optimization of each module while reducing the impact of magnetic coupling between systems, thereby improving load sharing stability without requiring complete redesign of the entire control system.
Solution Approach 2:
The patent introduces an intermediary coupling compensation mechanism that actively compensates for the magnetic coupling effects between interleaved three-phase systems. This intermediary control layer processes the interaction effects and adjusts the control signals accordingly, enabling stable load sharing while maintaining a relatively simple base control structure.
2Power
If multiple three phase systems operate simultaneously in modular generators, then power output is increased, but dynamic transitions and instability occur due to cross-magnetic coupling
Solution Approach 1:
The patent implements a feedback control mechanism that continuously monitors the operational state of each three-phase system and adjusts control signals in real-time. This feedback loop detects dynamic transitions and cross-magnetic coupling effects, then compensates for them by adjusting the control parameters, thereby maintaining stability while enabling multiple systems to operate simultaneously at high power output.
3Adaptability or versatility
If torque or power reference signals are changed dynamically in modular generators, then load adaptability is improved, but simultaneous changes across systems cause dynamic transitions and instability
Solution Approach 1:
The patent applies preliminary action by pre-coordinating torque or power reference signal changes across multiple three-phase systems before actual load changes occur. The control system plans and sequences the reference signal adjustments to avoid simultaneous changes, thereby maintaining stability while preserving load adaptability. This proactive coordination prevents dynamic transitions caused by synchronized reference signal modifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively mitigates dynamic transitions caused by cross-magnetic coupling, enhancing the robustness of control against parameter variations and improving load sharing and power distribution in modular generators.
Implementation Method 1
rotor flux linkage and angular shift identification from back electromotive force measurements
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
A method for providing dynamic load sharing between a first and a second three phase system is disclosed, wherein the first and second three phase system are connected to a first and second three phase interleaved winding in a generator. The method comprises determining a first q-axis control signal for the first three phase system and a second q-axis control signal for the second three phase system based on a torque and/or power demand for the generator, determining a first d-axis control signal for the first three phase system and a second d-axis control signal for the second three phase system based on a coupling effect between the first and second three phase systems, and adjusting the q-axis control signals and d-axis control signals by including at least one feed forward compensation signal, wherein said at least one feed forward compensation signal is based on a coupling effect between the first and second three phase systems.