Dual-Wound Generator Excitation Control for Coupling Mitigation
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Solution Overview
Problem
Dual-wound machines face challenges in managing inductive and electromechanical coupling between two circuits, leading to potential disturbances in power distribution when one circuit's load changes affect the other, due to shared stator flux and mechanical speed effects.
Innovation Solution
A wound-rotor dual-wound generator with a feedback loop that controls the excitation voltage applied to the field winding, maintaining a constant or adjusted magnetic field flux to mitigate dynamic coupling between phase windings, thereby regulating power distribution across separate loaded zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If dual-wound machines use two sets of windings to supply multiple subsystems from a single compact generator, then power density and system integration are improved, but dynamic coupling between the two sets of windings causes disturbances in power distribution when one circuit's load changes affect the other
Solution Approach 1:
The patent applies segmentation by dividing the single generator's output into two separate three-phase winding sets (first and second sets of three-phase windings) that are electrically isolated from each other. Each winding set independently supplies a different powered zone, creating electrical segmentation that prevents dynamic coupling disturbances from propagating between zones. The rotor is segmented to produce multiple independent magnetic fields that can be controlled separately for each winding set.
Solution Approach 2:
The patent implements dynamic control through independent control systems for each three-phase winding set. The first control system controls the first set of windings while the second control system controls the second set, allowing dynamic adjustment of each zone's power parameters independently. This dynamic control capability enables the system to maintain stable power distribution in one zone while accommodating load changes in another zone, resolving the reliability issue.
2Device complexity
If dual-wound machines use shared stator flux and mechanical speed, then device complexity is reduced, but inductive and electromechanical coupling between circuits increases causing disturbances
Solution Approach 1:
The patent introduces an intermediary approach by using a single rotor that generates multiple independent magnetic fields. The rotor acts as a common intermediary component that enables both winding sets to share the mechanical structure and magnetic field generation, reducing device complexity. However, the control systems act as intermediaries between the rotor's magnetic field and each winding set, allowing independent control that mitigates the harmful inductive and electromechanical coupling effects.
Solution Approach 2:
The patent applies parameter changes by enabling independent control of electrical parameters (voltage, frequency, phase) for each three-phase winding set while sharing the mechanical parameter (rotor speed). The control systems adjust electrical parameters dynamically to compensate for coupling effects, changing the operational parameters of each winding set independently to maintain stable power distribution despite shared mechanical characteristics.
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
The solution effectively reduces cross-bus coupling, ensuring stable power distribution by actively controlling the magnetic field, thus isolating disturbances and maintaining power quality across unbalanced loads.
Implementation Method 1
a wound rotor having a field winding producing a magnetic field
Data Source
AI summary
A dual-wound machine comprises a dual-wound generator supplying power to two separate powered zones. The generator comprises a wound rotor with a field winding and a stator with two sets of phase windings and a field control loop that controls the excitation voltage applied to the field winding and therefore the magnetic field produced by the rotor, in order to maintain a constant field flux in the generator and mitigate dynamic coupling between the two sets of phase windings when supplying power to unbalanced loads.