研究目的
Investigating the effects of reactive power injection on the lifetime of power converters in a DFIG wind turbine system and proposing an optimized reactive power flow to balance the lifetime between the rotor-side converter (RSC) and the grid-side converter (GSC).
研究成果
The study concludes that the lifetime of the GSC is significantly longer than that of the RSC when there is no reactive power exchange. Over-excited reactive power injection further reduces the RSC's lifetime. An optimized reactive power flow between the GSC and the RSC can balance their lifetimes, enhancing the RSC's lifespan by 1.5 times compared to full reactive power support through the RSC.
研究不足
The study focuses on steady-state small thermal cycles and does not consider large cycles caused by wind speed and environmental temperature fluctuations. The experimental validation is performed on a downscale prototype, which may not fully represent the conditions of a full-scale system.
1：Experimental Design and Method Selection:
The study evaluates the lifetime expectancy of RSC and GSC based on a typical annual wind profile and analyzes the effects of reactive power injection on the stress of power semiconductors.
2：Sample Selection and Data Sources:
A 2-MW wind turbine system is used as a case study, and experimental validations are performed at a downscale
3：5-kW DFIG prototype. List of Experimental Equipment and Materials:
Two
4：5-kW Danfoss motor drives are used for the GSC and the RSC, controlled by the implementation of dSPACE Experimental Procedures and Operational Workflow:
The study involves calculating the loss breakdown and thermal behavior of power devices, evaluating the lifetime consumed per year based on an annual wind profile, and testing different reactive power compensation strategies.
5：Data Analysis Methods:
The thermal performance of power semiconductors is analyzed using the Cof?n–Manson equation and Miner’s rule for lifetime estimation.
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