Induction Generator Power Buffering for Fast Load Response

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Solution Overview

Problem

Electrical machines face challenges in quickly accommodating varying power demands and managing voltage transients in power distribution systems, particularly in aircraft applications, due to the difficulty in rapidly adjusting power generation to meet changing load requirements.

Innovation Solution

The implementation of a controller module that manages an electrical machine with an induction generator and a converter, allowing for rapid adjustment of power output by supplementing or absorbing power from a power storage device, thereby maintaining electrical characteristics within defined thresholds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the electrical machine uses a conventional generator design, then the structure is simple and reliable, but the response time to varying power demands is slow

Engineering Contradiction:

Improveresponse timeVSAvoidsystem complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent combines the generator with a power conversion system and energy storage device into an integrated electrical machine assembly. The power conversion system includes a rectifier converting AC to DC, and an inverter converting DC to variable frequency AC, allowing rapid adjustment of power output to meet varying load demands while maintaining simple overall system architecture

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The electrical machine incorporates a variable speed drive system with a permanent magnet synchronous generator that can dynamically adjust its rotational speed and power output. The controller modulates the inverter switching to vary the frequency and voltage of the AC output, enabling rapid response to changing power demands without mechanical complexity

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the generator operates at variable speeds to meet changing load demands, then adaptability improves, but voltage stability becomes difficult to maintain

Engineering Contradiction:

Improveload adaptabilityVSAvoidvoltage stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The controller implements closed-loop feedback control by continuously monitoring the AC output voltage and frequency, and adjusting the inverter switching signals to maintain voltage within specified thresholds. The system measures the actual voltage and compares it with the reference value, then modifies the PWM duty cycle to correct any deviations, ensuring voltage stability despite variable operating conditions

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The power conversion system dynamically changes electrical parameters including frequency, voltage magnitude, and phase angle through inverter control. The controller adjusts these parameters in real-time based on load conditions, allowing the generator to operate at variable speeds while maintaining stable voltage output through electronic parameter modulation rather than mechanical adjustment

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the electrical machine rapidly adjusts power output to meet varying demands, then productivity improves, but voltage transients and electrical instability increase

Engineering Contradiction:

Improvepower adjustment speedVSAvoidvoltage transients

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The system incorporates an energy storage device (capacitor or battery) that acts as a buffer to cushion rapid power demand changes. When load demands suddenly increase or decrease, the energy storage device absorbs or supplies power to prevent large voltage transients, allowing the generator to respond quickly to load changes while the energy storage smooths out the electrical disturbances

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The power conversion system serves as an intermediary between the generator and the electrical loads. The rectifier-inverter combination transforms the generator's variable frequency output into a controlled AC output with regulated voltage and frequency, mediating the power transfer and filtering out voltage transients before they reach the loads, thus enabling rapid power adjustment without electrical instability

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution enables the electrical machine to respond quickly to changing power demands, reducing response delays and efficiently managing voltage transients, thus optimizing power distribution.

Implementation Method 1

an induction generator mechanically coupled to the rotatable shaft and defining a power output

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12537426B2Electrical machine and method of operating electrical machine

Publication Date: 2026.01.27 GE AVIATION SYSTEMS LLC

AI summary

An electrical machine comprising a rotatable shaft; an induction generator mechanically coupled to the rotatable shaft and defining a power output connectable with an electrical load, wherein the power output defines a desired constant voltage output; a converter electrically connected with the power output; and a controller connected to the converter, the controller configured to at least one of provide supplemental power at the power output or absorb excess power at the power output.