DFIG Reactive Power Control Under Wind Turbine Thermal Limits
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Solution Overview
Problem
Existing wind farms face challenges in extending their reactive power capability to meet dynamic requirements, which is essential for efficient operation and grid stability.
Innovation Solution
A control method and system that utilize wind forecast data to generate a real-time thermal model of a Doubly-Fed Induction Generator (DFIG) wind turbine, allowing for dynamic adjustment of the reactive power set point within system limits, thereby enhancing reactive power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the reactive power generation of wind turbines is increased to meet dynamic requirements, then the reactive power capability is improved, but the thermal limits of system components (DFIG, power converter, cables) may be exceeded
Solution Approach 1:
The control device obtains wind forecast data in advance and generates a real-time thermal model predicting future thermal states of the DFIG, power converter, and cables. This preliminary thermal assessment allows the system to proactively adjust reactive power set points before thermal limits are reached, enabling extended reactive power capability while preventing overheating of components
Solution Approach 2:
The system dynamically adjusts the reactive power set point based on real-time thermal model predictions and actual operating conditions. The reactive power capability is not fixed but adapts continuously to thermal capacity availability, allowing maximum reactive power generation when thermal margins permit and reducing it when thermal limits approach, thus resolving the contradiction between power output and thermal constraints
2Adaptability or versatility
If the reactive power set point is dynamically adjusted based on real-time thermal model, then the adaptability to meet reactive power requirements is improved, but the control system complexity increases
Solution Approach 1:
The patent introduces a control device as an intermediary between the wind turbine components and the grid requirements. This control device generates the real-time thermal model and calculates optimal reactive power set points, acting as a mediator that simplifies the overall control architecture while enabling sophisticated adaptive reactive power management. The control device consolidates the complexity in a single dedicated component rather than distributing it across multiple control elements
Data Source
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AI summary
A control method 300 for increasing reactive power generation of a wind turbine 100 having a Doubly-Fed Induction Generator DFIG 120 includes obtaining 302, by a control device 510 having one or more processors 512 and one or more memory devices 514, wind forecast data of the wind turbine 100. Further, the method 300 includes generating 304, by the control device 510, a real-time thermal model of the DFIG 120 of the wind turbine 100 using the wind forecast data. More specifically, the thermal model defines a thermal capacity for the DFIG 120 that does not exceed system limits. Thus, the method 300 also includes dynamically adjusting 306, by the control device 510, a reactive power set point of the DFIG 120 of the wind turbine 100 based on the real-time thermal model.