Wind Turbine Dynamic Brake Switch Control
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Solution Overview
Problem
Conventional dynamic brake systems in wind turbines face issues with temperature-related shutdowns during grid faults, leading to incomplete energy dissipation and potential damage to power converters, as they are gated off before excess voltage levels can be fully absorbed, risking further damage to the system.
Innovation Solution
A method is introduced where the dynamic brake switch remains engaged even when temperature thresholds are exceeded, disabling the over-temperature protection mechanism to ensure continuous energy dissipation and prevent premature shutdown, while enabling shutdown only when the system is not in use, thereby maintaining the dynamic brake's functionality and protecting the power converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the dynamic brake is gated off due to increased temperature conditions, then the dynamic brake components are protected from overheating, but the power converter may be damaged due to insufficient energy dissipation
Solution Approach 1:
The system performs preliminary action by gating off the dynamic brake switch before the temperature reaches critical levels that would cause permanent damage. The controller monitors temperature and preemptively opens the switch when predefined temperature thresholds are approached, preventing both overheating damage and ensuring safe energy dissipation conditions
Solution Approach 2:
The system implements feedback control by continuously monitoring the temperature of dynamic brake components and using this information to control the gating of the dynamic brake switch. The controller adjusts the switch state based on real-time temperature feedback, creating a closed-loop control system that balances heat protection with energy dissipation requirements
2Reliability
If the dynamic brake remains engaged during grid faults to absorb excess energy, then the power converter is protected from damage, but the dynamic brake components may overheat and fail
Solution Approach 1:
The controller takes preliminary action by monitoring temperature trends and gating off the dynamic brake switch before critical overheating occurs. This preemptive approach allows the system to protect the power converter during grid faults while preventing dynamic brake component failure from excessive heat accumulation
Solution Approach 2:
The system dynamically adjusts the operational state of the dynamic brake switch based on real-time temperature conditions. The switch is gated on when temperature conditions permit energy dissipation and gated off when temperature thresholds are approached, creating a dynamic response that balances energy absorption with thermal protection
3Loss of energy
If the dynamic brake switch is gated on during grid faults, then excess energy is dissipated, but grid disturbances and generator torque transients occur that can damage the system
Solution Approach 1:
The controller uses feedback control to monitor grid conditions and dynamically adjust the gating state of the dynamic brake switch. By responding to real-time grid fault conditions, the system dissipates excess energy only when necessary and safe, minimizing grid disturbances and torque transients while protecting against converter damage
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 approach ensures that the dynamic brake effectively absorbs excess energy during grid faults, reducing the risk of power converter damage by maintaining engagement beyond temperature limits and allowing safe shutdown only when necessary, thus enhancing the operational reliability and safety of wind turbine systems.
Implementation Method 1
Conventional dynamic brake systems include a resistor in series with a switch, such as an insulated-gate bipolar transistor (IGBT), and absorb excess energy in the converter when gated on
Data Source
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AI summary
Wind turbine systems 100 and methods for operating wind turbine systems 100 are provided. In one embodiment, a method includes gating on a dynamic brake switch 184 of a dynamic brake 180 in a wind turbine power converter 130 when an experienced direct current (DC) bus voltage 202 is equal to or greater than a threshold DC bus voltage 204. The method further includes disabling a threshold temperature rating 222 for the dynamic brake switch 184 when the dynamic brake switch 184 is gated on, and gating off the dynamic brake switch 184 when the experienced DC bus voltage 202 is less than the threshold DC bus voltage 204.