Synchronous Generator Stator Windings for HVDC MMC Integration
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Solution Overview
Problem
Existing electrical power systems for vehicles, particularly those using hybrid electric technology with high voltage direct current (HVDC) distribution, face challenges in minimizing harmonic distortion and electromagnetic interference (EMI) while optimizing packaging and weight, especially in integrating modular multilevel converters (MMCs) with synchronous generators.
Innovation Solution
The proposed electric power system incorporates a synchronous generator with specific winding configurations and a modular multilevel converter (MMC) that converts three-phase signals to DC signals, utilizing inductive windings in outer slots connected to MMC arms, and includes a control winding for regulating output voltage, thereby reducing EMI and harmonic distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If modular multilevel converters (MMCs) are integrated with synchronous generators using traditional topologies, then the system can achieve HVDC conversion, but large inductors are required which increase device complexity and packaging difficulty
Solution Approach 1:
The patent merges the inductor function with the generator stator windings by configuring the stator windings to provide both power generation and inductive energy storage functions. The stator windings are designed with specific winding patterns and connections that simultaneously generate electrical power and provide the necessary inductance for MMC operation, eliminating the need for separate large inductor components.
Solution Approach 2:
The stator windings are designed to perform multiple functions: power generation from mechanical input, providing inductive reactance for the MMC arms, and enabling low harmonic distortion output. This multi-functionality reduces the overall component count and simplifies the system architecture by having the stator windings serve both as generators and as the inductive elements required for HVDC conversion.
2Power
If traditional converter topologies are used, then HVDC conversion is achieved, but harmonic distortion and electromagnetic interference increase
Solution Approach 1:
The patent applies local quality by designing specific winding patterns in different regions of the stator. The stator windings are configured with particular winding directions, slot placements, and connection patterns that locally optimize the magnetic flux distribution to minimize harmonic generation. Different portions of the stator have windings arranged to cancel out specific harmonic components, reducing overall harmonic distortion and EMI.
Solution Approach 2:
The patent changes key parameters of the generator system including winding configurations, connection patterns, and magnetic circuit design to optimize performance. By adjusting these parameters, the system achieves low harmonic distortion and reduced EMI while maintaining efficient HVDC conversion capability through the MMC integration.
3Power
If MMCs with large inductors are used, then HVDC conversion is achieved, but system weight and size increase
Solution Approach 1:
The patent combines the generator and inductor functions into a single integrated structure. The stator windings serve dual purposes as both power-generating elements and inductive energy storage elements, eliminating the need for separate large inductor components that would add significant weight and volume to the system.
Solution Approach 2:
The patent extracts the inductor function from separate external components and integrates it directly into the generator stator windings. This extraction and integration approach removes the need for additional heavy inductor components, reducing overall system weight and size while maintaining the necessary inductive characteristics for MMC operation.
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 configuration results in improved packaging, reduced weight and size of EMI filters, and low harmonic distortion with moderate switching frequency, enhancing the overall efficiency and performance of the electrical power system.
Implementation Method 1
a synchronous generator in communication with the modular multilevel converter (MMS)... The synchronous generator comprises a stator, inner slots disposed in the stator, outer slots disposed in the stator... configured to receive a first phase signal, a second phase signal, and a third phase signal
Implementation Method 2
a fourth winding disposed in the outer slots, the fourth winding configured to receive a first phase signal... The fourth winding, the fifth winding, the sixth winding, the seventh winding, the eighth winding, and the ninth winding may be inductive
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An electric power system (EPS) may comprise a modular multilevel converter (MMC) (130) and a synchronous generator (110) in electronic communication with the MMC (130). The synchronous generator (130) may comprise a stator (500) comprising inner slots (510) and outer slots (520). First, second, and third windings may be disposed in the inner slots configured to receive first, second, and third phase signals, respectively. The first, second, and third windings may each split into two arms, each arm comprising an additional winding disposed in the outer slots (520) of the stator (500).