Wind Turbine Generator Temperature Control via Power Factor Adjustment
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Solution Overview
Problem
Wind turbine generators experience reduced cooling efficiency and potential over-temperature conditions when operated at high altitudes or in high ambient temperatures, leading to the need for improved cooling systems that are costly and challenging to retrofit.
Innovation Solution
Implementing a converter reactive power support capability that adjusts the operational power factor of the generator to reduce heat loss by sharing reactive load between the generator and a power converter, thereby minimizing the need for additional cooling systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the generator operates at high altitudes or high ambient temperatures, then the generator can be installed in more locations, but the cooling capability is reduced and over-temperature conditions occur
Solution Approach 1:
The invention changes the operational parameters of the generator by adjusting the power factor through reactive power support from a converter. This parameter change reduces the reactive current component, thereby reducing total current and heat loss, allowing the generator to operate within temperature limits even in high-altitude or high-ambient-temperature environments where cooling capability is reduced
2Temperature
If an enhanced cooler with axial and/or radial cooling fans is implemented, then the cooling capability is improved, but the cost and device complexity increase
Solution Approach 1:
The invention replaces the mechanical cooling enhancement approach (adding axial/radial cooling fans) with an electrical control approach. By using a converter to provide reactive power support and adjust the power factor, the system reduces heat generation at its source, eliminating the need for complex mechanical cooling system modifications
3Temperature
If an enhanced cooler is implemented, then the cooling capability is improved, but the cost increases
Solution Approach 1:
The invention substitutes expensive mechanical cooling enhancements with a more cost-effective electrical control solution. The converter's reactive power support capability allows the generator to operate efficiently without requiring costly retrofits of cooling systems, reducing both initial retrofit costs and ongoing maintenance expenses
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
Enables wind turbine generators to operate efficiently in high-altitude and high-temperature environments without derating, reducing cooling requirements and costs by managing heat loss through reactive power management.
Implementation Method 1
Implementing a converter reactive power support capability that adjusts the operational power factor of the generator to reduce heat loss by sharing reactive load between the generator and a power converter
Data Source
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AI summary
A wind turbine generator (10) system is provided. The system includes a generator (24) comprising a rotor (14) and a stator, the generator configured to generate electricity at a first power factor in a first mode of operation and to generate electricity at a second power factor in a second mode of operation wherein the second power factor is greater than the first power factor. The system further includes a power converter (404) electrically coupled to the rotor, the power converter configured to convert the electricity from the rotor to direct current (DC) electricity above a synchronous speed of the generator. The power converter is also configured to supply electricity to the rotor below the synchronous speed. The power converter is further configured to convert electricity at a third power factor in the first mode of operation and to convert electricity at a fourth power factor in the second mode of operation wherein the fourth power factor is less than the third power factor such that the power output of the generator system in the second mode of operation is substantially equal to the power output of the generator system in the first mode of operation and the generator currents are facilitated being reduced in the second mode of operation relative to the first mode of operation.