Abstract
Due to fast dynamic response and simple implementation, the transient direct current control (TDCC) strategy is widely used for electric traction rectifiers in high-speed train drive applications. However, the inevitable digital delay may increase the steady-state error of the TDCC and consequently degrade the ac-side power factor (PF). To address this, a comprehensive effects analysis of digital delay on traction rectifier is first performed, in which the relationship between the digital delay and PF is revealed and quantified. Furthermore, a phase shift compensation scheme is proposed to improve the PF. In this scheme, the modulation signal is compensated by shifting a specified angle, where the calculation of phase shift angle only needs a few control parameters. Extensive experimental tests are carried out to verify the effectiveness of the proposed compensation method.
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