Wind Turbine Power Factor Control via Reactance Correction
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Solution Overview
Problem
Conventional wind-power generation systems face challenges in accurately adjusting power factor at an interconnection node due to uniform reactive power commands, which limits voltage stability in utility grids.
Innovation Solution
A method and system where power-factor command values for individual wind turbines are determined by correcting a predetermined power-factor command using power factor correction levels set for each turbine, taking into account reactance components between the turbines and the interconnection node, allowing for precise power factor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a uniform reactive power command value is provided to individual wind turbines, then the control system is simple and easy to operate, but the accuracy of power factor adjustment at the interconnection node cannot be improved
Solution Approach 1:
The patent applies local quality by determining power factor correction levels individually for each wind turbine based on its specific reactance components and operating conditions. Instead of using a uniform reactive power command for all turbines, the system calculates customized power factor command values for each turbine that account for local variations in reactance, thereby improving overall power factor adjustment accuracy at the interconnection node.
Solution Approach 2:
The system changes the control parameter from a uniform reactive power command to individualized power factor command values. By calculating power factor correction levels for each turbine based on its reactance components and adjusting the power factor command accordingly, the system transforms the control approach to achieve higher precision power factor adjustment while maintaining manageable complexity through automated calculations.
2Measurement precision
If simple feedback control is performed without taking into account reactance components, then the control method is simple, but the power factor at the interconnection node cannot be adjusted accurately
Solution Approach 1:
The patent applies preliminary action by pre-calculating power factor correction levels for each wind turbine based on their reactance components before实际控制. The central controller determines these correction levels in advance and uses them to adjust power factor commands, allowing the system to compensate for reactance effects proactively rather than reacting to power factor deviations after they occur.
Solution Approach 2:
The system introduces power factor correction levels as an intermediary parameter that mediates between the uniform power factor command and the individual turbine responses. This intermediary accounts for the reactance components of each turbine, translating the central control intent into turbine-specific commands that compensate for line reactance effects and achieve accurate power factor adjustment at the interconnection node.
3Reliability
If different power-factor command values are set for individual wind turbines based on power factor correction levels, then the accuracy of power factor control is improved, but the control system becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the wind farm into individual wind turbine units, each with its own power factor correction level and command value. The central controller segments the control task by calculating and managing individual correction levels for each turbine based on their reactance components, allowing precise control of each unit while maintaining overall system reliability through coordinated management.
Data Source
AI summary
An object is to improve the accuracy of power factor adjustment. Power-factor command values corresponding to individual wind turbines are determined by correcting a predetermined power-factor command value for an interconnection node using power factor correction levels set for the individual wind turbines.