Asynchronous Generator Voltage Control for Wind Turbine Noise Reduction

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Solution Overview

Problem

Asynchronous generators in wind turbines produce noise due to vibrations caused by alternating magnetic flux, which is irritating to nearby residents and requires costly noise-reducing measures.

Innovation Solution

An asynchronous power generator with a voltage supply that adjusts the voltage to the stator coils based on output power to reduce noise, by maintaining an optimal flux level that minimizes vibrations and noise emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If noise-reducing cladding is used for the generator housing, then noise emission is reduced, but material cost and manufacturing complexity increase

Engineering Contradiction:

Improvenoise emissionVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The invention changes the electrical parameters (voltage magnitude and frequency) supplied to the stator coils to control the magnetic flux level. By operating at reduced voltage and adjusted frequency, the magnetic flux is kept below saturation levels, which significantly reduces the vibration and noise generation at the source, eliminating the need for additional noise-reducing cladding

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If voltage supplied to stator coils is reduced, then noise emission is reduced, but power output may be compromised

Engineering Contradiction:

Improvenoise emissionVSAvoidpower output

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The invention dynamically adjusts both the voltage magnitude and frequency supplied to the stator coils based on operating conditions. By coordinating voltage reduction with frequency adjustment, the system maintains optimal magnetic flux levels that prevent saturation and minimize noise while preserving the ability to deliver required power output

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes multiple electrical parameters simultaneously - reducing voltage magnitude while adjusting frequency - to maintain the relationship between voltage, frequency, and magnetic flux. This coordinated parameter change allows noise reduction through lower flux levels while maintaining power output capability

Inventive Principle:

Principle #35Parameter changes

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

Significantly reduces noise emission while maintaining optimal power output, without increasing material costs or manufacturing complexity.

Implementation Method 1

the stator coils are supplied with an alternating voltage. This alternating voltage induces an alternating magnetic flux

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentEP2166664B1An asynchronous power generator for a wind turbine

Publication Date: 2020.02.12 SIEMENS GAMESA RENEWABLE ENERGY AS

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AI summary

An asynchronous power generator for a wind turbine, comprising a voltage supply and a stator with stator coils supplied with an alternating voltage by the voltage supply, wherein the voltage supply is configured to adjust the voltage supplied to the stator coils based on the output power generated by the wind turbine, and a method of voltage control therefor.