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An Innovative Topology for Harmonics and Unbalance Compensation in Electric Traction System Using Direct Power Control Technique

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Figure

Figure 1 shows the proposed control design. A parallel active filter is used, indirectly connected to the power system  using a voltage expanding transformer
Fig.2 Traction transformer schemes a) V-V transformer b) Scott transformer
Figure 3 shows the open delta transformer (V-V) used to tie a traction substation to the electric grid, whereas the voltage space vector calculated in (11) is synthesized with the dual converter modulation method
Fig.4.Simulated active filter effect on the power system currents feeding a single phase rectifier load for the Scott and V–V connections (a) V–V (b) Scott
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