Wind Turbine Storage Charging Under Grid Power Limits
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Solution Overview
Problem
Existing wind turbines face inefficiencies in energy delivery to external systems due to energy storage system charging methods that result in energy loss and reduced power output, particularly when drawing power from the external grid.
Innovation Solution
A method and system for wind turbines that monitor power generation capacity and limit external delivery to a maximum power limit, redirecting excess power to an energy storage system for charging, utilizing the turbine's overhead capacity to maintain nominal power output while optimizing energy storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If power is extracted from the external power grid to charge the storage device, then the energy storage system is charged, but the net amount of electrical power delivered to the grid is reduced
Solution Approach 1:
The patent charges the energy storage device using power generated in advance by the wind turbine itself, rather than extracting power from the grid at the moment of charging. This preliminary generation and storage of power allows the system to later deliver maximum power to the grid without having to draw from external sources, thus resolving the contradiction between storing energy and maintaining high power delivery capability.
2Quantity of substance
If power is redirected to charge the storage device from the wind turbine output, then the storage device is charged, but the amount of power delivered to the power grid is reduced
Solution Approach 1:
The system generates excess power in advance using the wind turbine's overhead capacity and stores it in the energy storage device. This preliminary action ensures that when power is needed for grid delivery, the storage device can supplement the turbine output, allowing the turbine to operate at full capacity without compromising grid delivery amounts.
Solution Approach 2:
The patent utilizes the wind turbine's overhead capacity parameter - the ability of the turbine to generate more power than its rated output under certain conditions. By changing the operating parameter to allow temporary exceedance of rated power, the system can charge the storage device without permanently reducing the power delivery capability to the grid.
3Productivity
If the wind turbine operates at maximum power limit delivery, then external power delivery is maximized, but no excess power is available for charging the energy storage system
Solution Approach 1:
The patent exploits the parameter of overhead capacity in wind turbines, which allows the turbine to generate power above its rated output for periods of time. By temporarily increasing the generation parameter beyond the maximum power limit used for grid delivery, the system creates excess power that can be redirected to charge the energy storage system, thus resolving the contradiction between maximum delivery and charging availability.
Data Source
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AI summary
A method of charging an energy storage system (30) of a wind turbine (100) is provided, wherein the wind turbine (100) comprises a power generation system (20) for generating electrical power and a power delivery interface (110) for delivering the generated electrical power to an external system (120, 200) that is external to the wind turbine (100). The method comprises obtaining a maximum power limit (402) to which electrical power supplied to the external system (120, 200) via the power delivery interface (110) is limited; monitoring at least one of an amount of electrical power provided from the power generation system (20) to the power delivery interface (110) or an amount of power generatable by the power generation system (20); and determining if a predefined condition is met. If the predefined condition is met, a power system (10) of the wind turbine (100) is operated in a charging mode in which electrical power generated by said power generation system (20) in addition to a first amount of electrical power is supplied from the power generation system (20) to the energy storage system (30) to charge the energy storage system (30). The first amount preferably corresponds to a power rating of the wind turbine.