Abstract
To reduce the requirement of DC-biasing capacity and improve the biasing ability of a permanent magnet (PM), a novel hybrid saturated-core fault-current limiter (HSCFCL) is proposed in this paper. Compared with traditional saturated-core fault-current limiter (SCFCL), the HSCFCL has the advantages of small size, low DC-biasing capacity, a high biasing ability of the PM and excellent limiting performance. Firstly, the principle and the magnetic circuit model of the HSCFCL are introduced. Then, the improvement of DC-biasing capacity with a PM is analyzed. In addition, the influence of the leakage-flux effect on the biasing ability of the PM is presented in detail, and a small-section optimal structure is proposed to improve the biasing ability of the PM. Finally, to validate the principle and performance of the HSCFCL, various electromagnetic simulations, optimization studies and experiments are carried out. The simulation and experimental results demonstrate the effectiveness of the proposed method.
Highlights
Since renewable energy, energy demand and the scale of power grids continue to grow, excessive short-circuit current has been a serious problem for power systems [1,2,3,4]
This paper proposed a novel hybrid saturated-core fault-current limiter (HSCFCL), which has the advantages of small size, low DC-biasing capacity, a high biasing ability of the permanent magnet (PM), and excellent limiting performance
According to the principle of magnetic field division, the air region above the HSCFCL is divided in According to the principle of magnetic field division, the air region above the HSCFCL is divided in six types of cylindrical flux tubes with areas,which which referred as arch the arch six types of cylindrical flux tubes withdifferent differentcross-sectional cross-sectional areas, areare referred to astothe type type
Summary
Energy demand and the scale of power grids continue to grow, excessive short-circuit current has been a serious problem for power systems [1,2,3,4]. A small-section structure of the PMFCL is proposed to improve the biasing ability of the PM in [20]. There has been a lack of attention to the biasing ability of the PM that considers the leakage effect and the optimization of a small-section structure in a hybrid DC coil/PM structure. Due to the coupling effect between the AC and DC windings, even though the cores are driven out of saturation, the limiting impedance of the SCFCL is still not large, resulting in insufficient limiting performance [21]. This paper proposed a novel hybrid saturated-core fault-current limiter (HSCFCL), which has the advantages of small size, low DC-biasing capacity, a high biasing ability of the PM, and excellent limiting performance. A small-section optimal structure is proposed to improve the biasing ability of the PM.
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