Dual PMG Power System with Active Rectifiers for Fault Tolerance
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Solution Overview
Problem
Existing electric power generating systems for vehicles lack sufficient fault tolerance and efficient power management, leading to potential system failures and increased weight and volume due to EMI filter requirements.
Innovation Solution
The system employs dual permanent magnet generators with co-axially mounted windings and active rectifiers, along with a load management controller that monitors and controls output, allowing for fault tolerance by isolating faulty components and optimizing power distribution through DC link management, reducing the need for heavy EMI filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If EMI filters are added to meet electromagnetic interference standards, then electromagnetic compatibility is improved, but system weight and volume increase
Solution Approach 1:
The patent removes the EMI filter component from the system by using a voltage source inverter topology that inherently produces clean sinusoidal output currents without requiring external filtering. This extraction of the harmful filtering requirement reduces system weight and volume while maintaining electromagnetic compatibility.
Solution Approach 2:
The patent replaces the mechanical/physical EMI filter system with an electronic control system that uses pulse width modulation and active switching to generate clean output waveforms. This substitution eliminates the need for heavy inductors and capacitors while achieving the same electromagnetic compatibility goals.
2Object-affected harmful factors
If EMI filters are added to meet electromagnetic interference standards, then electromagnetic compatibility is improved, but system volume increases
Solution Approach 1:
The patent removes the EMI filter component from the system by using a voltage source inverter topology that inherently produces clean sinusoidal output currents without requiring external filtering. This extraction of the harmful filtering requirement reduces system weight and volume while maintaining electromagnetic compatibility.
3Device complexity
If a single power generating system is used, then system complexity is reduced, but fault tolerance decreases
Solution Approach 1:
The patent divides the power generating system into two independent single-phase voltage source inverters, each capable of operating autonomously. This segmentation allows one inverter to continue providing power if the other fails, thereby improving fault tolerance while maintaining relatively simple system architecture.
Solution Approach 2:
The patent assigns different functional roles to the two inverters: one operates as the primary power source while the other serves as a standby or auxiliary source. This local differentiation of function allows the system to achieve redundancy without requiring complete duplication of all system components, thus balancing complexity and reliability.
4Productivity
If active rectifiers with EMI filters are used, then power conversion efficiency is improved, but system weight increases
Solution Approach 1:
The patent replaces the mechanical/physical EMI filter system with an electronic control system that uses pulse width modulation and active switching to generate clean output waveforms. This substitution eliminates the need for heavy inductors and capacitors while achieving the same electromagnetic compatibility goals.
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 enhances fault tolerance, reduces system weight and volume, and ensures continuous power delivery by equally sharing load between active rectifier-based power systems, effectively managing faults and minimizing EMI filter requirements.
Implementation Method 1
a first permanent magnet generator (PMG) and a second PMG
Data Source
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AI summary
An electrical power generating system comprises a first permanent magnetic generator (PMG) stator winding (102a) of a generator machine, a first active rectifier (106a) communicatively connected to the first PMG stator winding (102a), the first active rectifier (106a) operative to receive alternating current (AC) from the first PMG stator winding (102a) and convert the AC to direct current (DC), a direct current link communicatively connected to the first active rectifier (106a), wherein the first active rectifier (106a) is operative to output the DC to the direct current link, a second PMG stator winding (102b) of the generator machine, and a second active rectifier (106b) communicatively connected to the second PMG stator winding (102b), the second active rectifier (106b) operative to receive AC from the second PMG stator winding (102b) and convert the AC to DC, the second active rectifier (106b) communicatively connected to the direct current link and operative to output DC to the direct current link.