Harmonic Reduction in Wind Turbine Power Supply via Phase Angle Combination
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Solution Overview
Problem
Wind turbines in wind farms often generate electrical outputs with harmonics that can cause issues for electrical and electronic components, and existing solutions fail to effectively combine these outputs to reduce harmonics to acceptable levels for grid connection.
Innovation Solution
A power supply device and method that combine the output currents of multiple wind turbines' generators with different phase angles using a combination unit, which includes transformers and a generator control unit to adjust phase angles, resulting in a combination current with reduced harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If output currents of multiple wind turbines are combined to increase power output, then productivity is improved, but harmonic levels increase causing electrical and electronic component problems
Solution Approach 1:
The patent segments the power combination process by introducing separate combination units for different phase groups. Instead of directly combining all turbine outputs, the system divides turbines into first and second groups with different phase relationships, combining them separately before final aggregation. This segmentation allows harmonic cancellation within each group while maintaining overall power output.
Solution Approach 2:
The patent converts the harmful harmonics generated by individual wind turbines into a beneficial cancellation effect. By deliberately creating phase differences between combined outputs and utilizing the natural harmonic characteristics of different turbines, the system causes harmonics to oppose and cancel each other, transforming a harmful factor into a solution for harmonic reduction.
2Object-generated harmful factors
If phase angles of generator outputs are adjusted to reduce harmonics, then harmonic levels are reduced, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements dynamic phase angle adjustment through control units that continuously monitor and modify the phase relationships between different generator outputs. This dynamic control allows the system to adapt to changing operating conditions while maintaining optimal harmonic cancellation, balancing the need for harmonic reduction with operational flexibility.
Solution Approach 2:
The system incorporates feedback mechanisms where control units monitor the combined output and adjust phase angles accordingly. This feedback loop ensures that harmonic levels remain within acceptable ranges while minimizing the need for complex manual intervention, as the system self-regulates based on real-time measurements.
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 solution effectively reduces harmonic levels by canceling out harmonics through the combination of output currents with different phase angles, ensuring compliance with grid standards and improving energy efficiency in wind farms.
Implementation Method 1
a first electrical generator adapted for providing a first output current having a first phase angle, at least a second electrical generator adapted for providing a second output current having a second phase angle independent of the first phase angle
Implementation Method 2
combining the first output current and the second output current to a combination current having reduced harmonics with respect to the first and second output currents
Data Source
AI summary
A power supply device adapted for supplying electrical power to a load comprises a first electrical generator adapted for providing a first output current having a first phase angle; at least a second electrical generator adapted for providing a second output current having a second phase angle independent of the first phase angle; and a combination unit adapted for combining the first output current and the second output current to a combination current having reduced harmonics compared to the first and second output currents.