Wind Turbine Battery Storage With Cell Bypass Voltage Control
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Solution Overview
Problem
Existing energy storage systems for wind turbines face inefficiencies in managing power fluctuations and grid integration, as they often rely on conventional batteries connected directly to DC-links or via inverters, lacking flexible control over current paths and voltage regulation.
Innovation Solution
A battery storage system with individually controllable battery cells and semiconductor switches, connected to the electric flow path, allowing dynamic control of current paths and voltage regulation based on real-time requirements, enabling efficient charging and discharging, and integration with both AC and DC voltage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional batteries are connected directly to DC-link or via inverters, then the energy storage system can store and deliver power, but the system lacks flexible control over current paths and voltage regulation
Solution Approach 1:
The battery storage system is divided into multiple individually controllable battery cells, each equipped with its own semiconductor switches. This segmentation allows independent control of current paths through each cell, enabling flexible voltage regulation and adaptive operation without requiring a complex centralized control system.
Solution Approach 2:
The system employs dynamic control of semiconductor switches to adjust current paths and voltage levels in real-time based on operational requirements. This dynamic switching capability provides flexibility in managing power flow between the battery storage, wind turbine, and grid, while maintaining manageable system complexity through standardized switch configurations.
2Reliability
If all battery cells are always active in the current path, then maximum power storage and delivery capacity is achieved, but system reliability decreases when individual cells fail
Solution Approach 1:
The control system is designed to identify and bypass failed or degraded battery cells, effectively 'discarding' them from active service while maintaining operation of healthy cells. This allows the system to continue delivering power at reduced capacity rather than failing completely, thereby improving reliability without permanently sacrificing the productivity of remaining functional cells.
Solution Approach 2:
Problematic battery cells can be extracted from the active current path through semiconductor switch bypass mechanisms, allowing the rest of the battery system to continue operating independently. This extraction of failed components maintains system reliability while minimizing impact on overall power storage and delivery capacity.
3Loss of energy
If battery storage is integrated with wind turbine, then energy fluctuations can be managed, but capital and operational expenses increase
Solution Approach 1:
The battery storage system with individually controllable cells and semiconductor switches serves multiple functions: energy storage, voltage regulation, harmonic mitigation, and reliable operation during grid disturbances. This multi-functionality allows a single system to address various energy fluctuation challenges, reducing the need for separate specialized equipment and thereby lowering overall capital and operational expenses despite the integrated design.
Data Source
AI summary
A battery storage and/or a wind turbine including the battery storage. A generator for generation of an electric current. An electric flow path configured for conducting the electric current to an electric grid via a power converter, the power converter. The battery storage electrically connected to the electric flow path, the battery storage comprising a plurality of battery cells, each battery cell comprising at least one battery element and at least two semiconductor switches. A controller is configured for selectively controlling the voltage over the battery storage by controlling the status of the at least two semiconductor switches of a plurality of the battery cells, and thereby whether a current path through the battery storage is bypassing the at least one battery element or passing through the at least one battery element of one or more of the plurality of battery cells.