Wind Turbine Supercapacitor Backup Control for Off-Grid Stability
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Solution Overview
Problem
Existing energy storage systems for wind turbine generators face challenges in providing stable off-grid backup power due to intermittency and volatility, leading to instability and safety risks, and lack effective regulatory strategies to adapt to grid fluctuations, resulting in high costs and poor system reliability.
Innovation Solution
A method utilizing supercapacitors for off-grid backup power regulation, which involves calculating active and reactive power requirements based on real-time grid conditions and wind farm output to adjust power output of wind turbine generators, enhancing frequency and voltage stability through real-time power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a decentralized energy storage backup power supply is equipped for each wind turbine generator, then system reliability and safety are improved, but system complexity and cost increase
Solution Approach 1:
The patent divides the energy storage system into decentralized units, with each wind turbine generator equipped with its own supercapacitor backup power supply. This segmentation allows each unit to operate independently and provide local support, improving overall system reliability without requiring a complex centralized control architecture.
Solution Approach 2:
Each wind turbine generator is equipped with its own supercapacitor backup power supply that can autonomously detect grid failures and switch to backup mode without external control signals. The system automatically monitors its own state and provides backup power when needed, reducing control complexity while maintaining high reliability.
2Productivity
If existing centralized power energy storage systems are used, then cost is reduced, but the system fails to respond promptly to grid fluctuations and stability is poor
Solution Approach 1:
The patent transitions from a centralized energy storage system to a decentralized architecture where each wind turbine has its own supercapacitor unit. This segmentation enables each unit to independently and rapidly respond to local grid fluctuations, significantly improving response speed and stability compared to centralized systems that must communicate and coordinate across the entire farm.
Solution Approach 2:
The supercapacitor acts as an intermediary energy storage device between the wind turbine generator and the grid. It rapidly absorbs or releases energy to smooth out fluctuations and provide immediate support during grid disturbances, enabling the system to respond within milliseconds rather than seconds or minutes.
3Reliability
If simple regulatory strategies are used for energy storage backup power supplies, then operational costs are reduced, but frequency and voltage regulation effectiveness is insufficient
Solution Approach 1:
The patent implements a feedback control mechanism where each decentralized supercapacitor unit continuously monitors grid frequency and voltage conditions. When deviations are detected, the system automatically adjusts its charge/discharge rate to restore nominal values, creating a closed-loop control system that maintains stability without requiring complex external coordination or high operational costs.
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 method stabilizes frequency and voltage in off-grid operations, reducing costs by up to 20% and improving system reliability, while enabling flexible and reliable power regulation, thus enhancing safety and economic benefits.
Implementation Method 1
utilizing supercapacitor to participate in off-grid backup power regulation
Data Source
AI summary
The present disclosure provides a method and system for utilizing a supercapacitor to participate in off-grid backup power regulation for a wind turbine generator, a device and a medium, and the method includes the following steps: S1, calculating an active power allocation requirement and a reactive power allocation requirement of a target wind farm, respectively; S2, determining active allocated power and reactive allocated power for a supercapacitor and a wind turbine in each wind turbine generator according to the obtained active power allocation requirement and reactive power allocation requirement of the target wind farm; and S3, adjusting an active power target value and a reactive power target value of each wind turbine generator according to the obtained active allocated power and reactive allocated power.