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Author: search.filters.author.Karaipoom, TanaponSubject: search.filters.subject.superconducting magnetic energy storage

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    Improving Low-Voltage Ride-Through Performance and Alleviating Power Fluctuation of DFIG Wind Turbine in DC Microgrid by Optimal SMES with Fault Current Limiting Function
    (2014-10-01)
    Ngamroo, Issarachai
    ;
    Karaipoom, Tanapon
    The vital problems of doubly fed induction generator (DFIG) wind turbine are power fluctuation and low-voltage ride-through performance. To tackle both problems, the new circuit configuration and optimization technique of the superconducting magnetic energy storage with fault current limiting function (SMES-FCL) in a DC microgrid are presented. The SMES-FCL circuit mainly consists of two DC choppers with common superconducting coil (SC). During normal operation, the SMES-FCL acts as the SMES unit to suppress the power fluctuation of DFIG. When severe faults occur in the system, the SC is automatically connected to the system and used as the fault current limiter. Consequently, the fault current and the terminal voltage drop of DFIG can be alleviated. The energy function method is used to formulate the optimization problem of SC inductance, initial stored energy, and proportional-integral control parameters of choppers. Simulation study confirms the superior control effect of the SMES-FCL over the conventional SMES.
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    Enhancement of LVRT performance and alleviation of power fluctuation of DFIG wind turbine in DC microgrid by SMES
    (2013-01-01)
    Karaipoom, Tanapon
    ;
    Ngamroo, Issarachai
    Recently, a doubly fed induction generator (DFIG) wind turbine has been extensively paid attentions as a renewable energy source in the DC microgrid. However, the inevitable problems of DFIG wind turbine are low voltage ride through (LVRT) due to the occurrence of faults as well as the power fluctuation. To overcome both problems, a superconducting magnetic energy storage (SMES) unit which is able to provide fast control of active and reactive power, can be used. This paper applies a SMES unit to enhance LVRT performance and alleviate the power fluctuation of DFIG wind turbine in the DC microgrid. The SMES circuit is mainly composed of the DC chopper. The PI controllers of DC chopper are used to control the exchange energy between the superconducting coil and the system. Simulation study using MATLAB/SimPowerSystems ensures the SMES control effect on both enhancing LVRT performance and smoothing power fluctuation of DFIG wind turbine. © 2013 IEEE.