Multiplex Winding Synchronous Generator Voltage Regulation
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Solution Overview
Problem
Synchronous generators with duplex stator windings are prone to current unbalance and circulating currents, leading to thermal damage due to overheating, which is not effectively addressed by existing technologies.
Innovation Solution
A multiplex winding synchronous power generating system is introduced, featuring a rotating part with multiple windings, a prime mover, a stator part with multiple windings, rectifiers, 3-phase 5-level motor drives, at least one H-bridge, and a generator voltage regulator that regulates current of local DC busses, reducing parasitic effects of current imbalance and circulating currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplex stator winding configurations are used in synchronous machines, then fault tolerance and reduction of cross section of magnet wire and terminal leads are achieved, but current unbalance and circulating currents occur leading to thermal damage
Solution Approach 1:
The control system continuously monitors currents in all phases and windings, detecting unbalance and circulating currents in real-time. Based on feedback signals, the controller adjusts switching patterns of the multilevel inverters to eliminate harmful currents while maintaining balanced operation, preventing thermal damage to the stator winding insulation
Solution Approach 2:
The system dynamically changes operating parameters including switching frequencies, pulse width modulation (PWM) duty cycles, and inverter switching patterns to optimize current distribution in the multiplex windings. By adjusting these parameters, the system eliminates circulating currents and maintains balanced phase currents, preventing overheating while preserving the fault tolerance benefits of duplex windings
2Object-generated harmful factors
If multilevel topologies are used to achieve high power levels, then low harmonic distortion and reduced EMI emissions are achieved, but device complexity increases
Solution Approach 1:
The power conversion system is divided into multiple independent inverter modules, each handling a specific phase or winding set. Each module contains its own H-bridge or multilevel inverter circuitry, allowing independent control and simplifying the overall system architecture. This modular segmentation reduces harmonic distortion and EMI while making the complex system more manageable and maintainable
Solution Approach 2:
The multilevel inverter system is designed to perform multiple functions simultaneously: power conversion, harmonic elimination, EMI reduction, and current balancing across all phases and windings. By integrating these functions into a unified control architecture, the system achieves high performance without proportionally increasing complexity, as the same hardware infrastructure serves multiple purposes
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 system enhances reliability and fault tolerance, reduces electromagnetic interference emissions, and achieves low harmonic distortion with moderate switching frequency, thereby preventing thermal damage and improving power system efficiency.
Implementation Method 1
a generator voltage regulator that regulates current of voltages of local DC busses of the three 3-phase 5-level motor drives
Implementation Method 2
a plurality of rectifiers, three 3-phase 5-level motor drives
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
Multiplex winding synchronous power generating systems and vehicle power systems are provided that include a rotating part (434a) including a plurality of windings, a primer mover (436) configured to drive the rotating part, a stator part (434b) having a plurality of windings, a plurality of rectifiers (404a-f), three 3-phase 5-level motor drives (444a-c), at least one H-bridge (454), at least one 3-phase AC motor (448a-c), and a generator voltage regulator (450) that regulates current of voltages of local DC busses of the three 3-phase 5-level motor drives.