Application of phase-shifting reactor in harmonic suppression of the independent power supply system

The electric propulsive shipping power grid is a typical independent power supply system, and the anti-jamming ability to non-linear load is quit weak because of the limitation of generation capacity. So the influence of the harmonics becomes more serious. Meanwhile, the variation range of the voltage and frequency is often large, which can cause the tuning point deviation of the passive filter easily. A novel method to suppress the harmonics of this kind grid by adopting the phase-shifting strategy is put forward in this paper. The phase current can be divided into two branches through phase-shifting windings, and specific phase-shifting angle can be achieved by choosing proper winding turns and connection way. The configuration of the phase-shifting windings is analyzed in detail and the optimal selection of the phase-shifting angle is also done. The accuracy and the effectiveness are verified by the EMTDC/PSCAD based simulation results.