DFIG Wind Turbine Reactive Power Allocation via Priority Ratio
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Solution Overview
Problem
Doubly-fed induction generator (DFIG) wind turbine systems face increased stresses on the stator due to reactive power production, leading to reduced efficiency and shorter operational life, as the stator is subjected to higher currents, temperatures, and losses compared to the line side converter.
Innovation Solution
A control method and system that determine a priority ratio based on operating parameters such as current, voltage, and stress factors for the DFIG and line side converter to allocate reactive power production, ensuring the combined output meets the reactive power requirement while minimizing stress on both components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator supplies reactive power for the system, then the reactive power production requirement is met, but the stator is subjected to increased currents, temperatures, and losses that reduce efficiency and operating life
Solution Approach 1:
The patent divides the reactive power production function between two separate components: the stator and the line side converter. Instead of relying solely on the stator, the system segments the reactive power supply task and allows the line side converter to share or assume this function, thereby reducing the burden and stress on the stator while maintaining overall reactive power production capability.
Solution Approach 2:
The line side converter is designed to perform multiple functions: it handles real power conversion and also provides reactive power support. By making the line side converter multi-functional, the system reduces dependency on the stator for reactive power, thereby extending stator operating life while maintaining system reliability.
2Reliability
If the stator supplies all reactive power, then the reactive power production requirement is met, but system complexity increases due to stress management and component wear
Solution Approach 1:
The control system continuously monitors operating parameters such as stator current, line side converter current, and reactive power production levels. Based on this feedback, the controller dynamically adjusts the allocation of reactive power between the stator and line side converter, optimizing stress distribution and extending component life while maintaining system availability.
Solution Approach 2:
The reactive power allocation is made dynamic rather than fixed. The control system continuously adjusts the reactive power distribution between stator and line side converter based on real-time operating conditions, allowing the system to adapt to changing demands and minimize stress on critical components.
Data Source
AI summary
Systems and methods for allocating reactive power production in a doubly-fed induction generator (DFIG) wind turbine system including a DFIG and a power converter including a line side converter and a rotor side converter are provided. A method can include obtaining a reactive power production requirement, obtaining one or more operating parameters for the DFIG and the line side converter, and determining a priority ratio based at least in part on the one or more operating parameters. The priority ratio can be a ratio of reactive power production between the DFIG and the line side converter. The method can further include controlling the DFIG and the line side converter based at least in part on the reactive power production requirement and the priority ratio such that the combined reactive power production from the DFIG and the line side converter meet the reactive power production requirement.