Abstract
This paper presents an impedance-based stability analysis of metro traction power system considering the grid-feedback regenerative braking application. The impedance model of metro traction power system is first established based on the constant power characteristics of metro train and grid-feedback inverter. Further, the impedance-based stability criterion is developed to investigate the instability issue in traction operation and regenerative braking operation, respectively. Simulation verification is performed to validate the proposed impedance-based stability analysis method of metro traction power system. The proposed stability analysis method is able to provide design guideline for grid-feedback inverters in terms of stability.
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