Duplex Power Supply Switching for Wind Turbine Auxiliary Machines
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Solution Overview
Problem
Existing power supply methods for wind turbine generators lack redundancy, making them vulnerable to power outages and operational disruptions due to single-path power delivery to auxiliary machines.
Innovation Solution
A power supply device with a switching section that connects multiple paths between a direct-current link, a utility grid, and auxiliary machines, allowing power to be switched between these paths based on grid stability and converter status, ensuring redundant power supply and continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single path for supplying power to auxiliary machines is used from the DC link, then the device complexity is reduced, but the reliability of power supply deteriorates
Solution Approach 1:
The power supply system is segmented into multiple independent paths: a first path from the DC link through a third converter, and a second path from the utility grid through a switching section. This segmentation allows each path to operate independently, providing redundancy and improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The switching section dynamically switches between the first and second paths based on system conditions such as grid availability, converter status, and operational requirements. This dynamic reconfiguration enables the system to adapt to changing conditions, maintaining reliable power supply while managing complexity through intelligent control rather than permanent redundant infrastructure.
2Reliability
If multiple paths for power supply are configured, then the reliability of auxiliary machine operation is improved, but the device complexity increases
Solution Approach 1:
The switching section serves multiple functions: it selects between different power sources (DC link or utility grid), isolates faulty paths, and enables maintenance operations. This multi-functionality consolidates control logic into a single component, providing the benefits of multiple paths without proportionally increasing system complexity.
Solution Approach 2:
The switching section acts as an intermediary between the power sources and auxiliary machines, managing the complexity of path selection and transition. By placing this intelligent mediator in the control path, the system achieves reliable multi-path operation while keeping the overall architecture manageable through centralized decision-making logic.
3Reliability
If power is supplied from the DC link via the third converter, then the auxiliary machines can operate independently of utility grid status, but the ease of operation for grid-connected mode is reduced
Solution Approach 1:
The control section automatically monitors system conditions and switches between power paths without requiring manual intervention. The system self-manages the complexity of mode switching by implementing automatic detection of grid status, converter health, and optimal power source selection, thereby maintaining operational independence while preserving ease of use through automation.
Solution Approach 2:
The control section continuously receives feedback from the utility grid status, converter operational state, and switching section position to make intelligent decisions about power path selection. This feedback mechanism enables the system to automatically adapt to changing conditions, providing both independence from grid issues and ease of operation through automated control rather than manual switching.
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 provides a duplex auxiliary machine power supply, ensuring continuous operation by switching power sources based on grid stability and converter conditions, reducing the risk of power outages and allowing for inspection and maintenance without interrupting auxiliary machine operation.
Implementation Method 1
a first converter for converting alternating-current power received from the power generation apparatus into direct-current power
Implementation Method 2
a second converter for converting the direct-current power into alternating-current power matching the frequency of a utility grid
Implementation Method 3
via a third converter for converting direct-current power supplied from the direct-current link into alternating-current power
Data Source
AI summary
An object is to provide a duplex power supply for auxiliary machines. A power supply device includes a switching section that is connected to a direct-current link between a generator-side inverter and a grid-side inverter via an auxiliary machine power inverter for converting direct-current power supplied from the direct-current link into alternating-current power to form a first path, that is connected somewhere between a power-converting section and a utility grid to form a second path, and that is connected to auxiliary machines to form a third path, and the switching section switches between connection of the third path to the first path and connection of the third path to the second path.