Wind Turbine DC Backup Bus Without AC-DC-AC Conversion
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Solution Overview
Problem
Conventional wind turbine power backup systems experience inefficiencies and increased complexity due to the need for voltage adjustment devices and AC-DC-AC inverters, leading to switching losses and higher installation costs when handling grid faults or temporary voltage drops.
Innovation Solution
A power backup system with a single DC bus configured at a high voltage level, utilizing series-connected power storage units that provide a total backup voltage within the nominal range of the internal power supply grid, eliminating the need for voltage boosters and AC-DC-AC inverters, and incorporating a redundant power storage module for increased reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power backup systems use voltage adjustment devices and AC-DC-AC inverters, then power can be supplied during grid faults, but switching losses increase and efficiency decreases
Solution Approach 1:
The patent extracts and eliminates the AC-DC-AC inverter stage from the power conversion path. By using a single DC bus architecture where both the power storage module and power consuming units operate at DC voltage, the system removes the unnecessary AC conversion环节 that causes switching losses, while maintaining reliable power supply during grid faults.
Solution Approach 2:
The patent changes the voltage parameter configuration by operating the entire power backup system at a single high voltage DC level (e.g., 600V or 1000V DC) instead of multiple voltage levels with AC conversion. This parameter change eliminates the need for voltage adjustment devices and AC-DC-AC inverters, reducing switching losses while ensuring reliable power delivery.
2Adaptability or versatility
If multiple voltage levels are used in internal power supply grids, then power distribution flexibility is improved, but device complexity and installation costs increase
Solution Approach 1:
The patent implements a universal single DC bus architecture that serves all power consuming units regardless of their specific power requirements. This single high-voltage DC bus can directly supply power to various DC loads and, when needed, convert to lower voltages through simple DC-DC conversion or controlled rectification, eliminating the need for multiple voltage levels and complex distribution networks.
Solution Approach 2:
Instead of the conventional approach of using multiple voltage levels with step-up/step-down transformers and AC-DC-AC conversion, the patent inverts the architecture by using a single high-voltage DC bus that can directly supply all loads. This inversion simplifies the system by eliminating intermediate voltage conversion stages and reducing overall complexity.
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 solution reduces voltage drops, motor, and cable dimensions, decreases installation complexity and costs, enhances power handling capabilities, and increases efficiency and backup time by directly supplying power to the internal grid without inverting losses, while ensuring high reliability through redundant power storage units.
Implementation Method 1
the power backup system comprises a power storage module providing a total backup voltage that falls within a nominal voltage range of the internal power supply grid of the wind turbine
Data Source
AI summary
The present invention relates to a wind turbine comprising an internal power supply grid for distributing power to a number of power consuming units of the wind turbine, the wind turbine further comprising a power backup system connected to the internal power supply grid for supplying power to said internal power supply grid during a grid fault, wherein the power backup system comprises a power storage module providing a total backup voltage that falls within a nominal voltage range of the internal power supply grid of the wind turbine.