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The DC current of the single-phase inverter or rectifier contains low frequency ripple whose frequency is twice that of the AC voltage. Traditionally, electrolytic capacitor is used to eliminate these ripple, but it has relatively short lifespan and affect the lifetime of the entire inverter or rectifier system. In this paper, a single-phase bidirectional bridge topology without electrolytic capacitor...
In this paper, the variable-bandwidth hysteresis-modulation sliding-mode (VB-HM-SM) method is applied for a single-stage single-switch isolated power-factor-correction (PFC) regulator. In the regulator, the dc-dc stage works in CCM and is regulated by PWM, while the ac-dc boost stage works in DCM and is regulated by PFM. However, both PWM and PFM are realized by a sliding mode (SM) controller, and...
over-voltages happen when electric locomotive passes the articulated phase insulator, which causes substation tripping and has serious influence on safe operations of the overhead contact system and traction substations. This paper analyzes the mechanism of over-voltage generated and simulates the process of the electric locomotive passing the articulated phase insulator, put forward a scheme to avoid...
This paper presents a hybrid PWM method under a low switching frequency based on SVPWM and SHEPWM, which use asynchronous carrier modulation SVPWM at low frequency, and SHEPWM at high frequency, a square wave after rated conditions. The transitive strategy is proposed to realize smooth transition of individual modes including SVPWM, SHEPWM and square wave. Simulation and experimental results confirm...
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