Abstract
This study presents two methods of controlling neutral-point voltage oscillation in a hybrid VIENNA rectifier, which is composed of the parallel association of a three-phase single-switch Boost rectifier with a VIENNA-type rectifier. The neutral-point oscillation reason has been analysed with a mathematical model. Meanwhile, the two neutral-point control methods of a simplified method based on a zero-sequence component injection and a dual-carrier pulse-width modulation (PWM) method are proposed to control the voltage deviation of the split DC-link and three-time fundamental frequency neutral-point voltage fluctuation with a decrease from ±1.6 to ±1 V, respectively. Moreover, the significant oscillation in the neutral-point voltage caused by unbalanced loads or asymmetric capacitor parameters can also be effectively suppressed by using the dual-carrier PWM method. Furthermore, the performance comparison between these two methods is provided. The experimental results show that the system after being introduced the proposed two methods still exhibits a low-order input current harmonic such as second, third, and fourth harmonics as well as the input current total harmonic distortion is lower than the standard 5%.
Highlights
The hybrid VIENNA rectifier is assembled by the parallel connection of a three-phase single-switch boost rectifier (TPSSBR) and a VIENNA-type rectifier
The neutral-point voltage oscillation is an inherent problem in three-level topology including hybrid VIENNA rectifier, which can lead to unbalanced voltage of the capacitor and cause the switch over-voltage damage, it affects the input line voltage waveform as well as making the total harmonic distortion (THD) of input current become large with the same filter parameters [12, 13]
The THD of input current is 4.23%, which is lower than THD = 5%, illustrating that the hybrid VIENNA rectifier has a good performance in low current THD and power factor (PF) under the d–q-axis cross-decoupling control system
Summary
The hybrid VIENNA rectifier is assembled by the parallel connection of a three-phase single-switch boost rectifier (TPSSBR) and a VIENNA-type rectifier. The hybrid rectifier is reported to have many advantages, including low input current harmonics, higher efficiency, and reliable performance compared with the single rectifier [4,5,6,7] This rectifier has an application potential in the aspect of the DC arc furnace, plasma arc torches, electro-winning, plasma cutting system [8,9] and aviation power source [10], and charging pile power source [11], on the other hand, it can find application in the retrofit projects where a three-phase diode rectifier already exists, but its input current distortion is to be reduced to comply with new standards only through a parallel connection of VIENNA-type switch bridge instead of significant changing the topology structure [9]. Song et al [17] presented a hybrid neutral-point voltage fluctuation control method combining a dynamic adjustment factor with a voltage deviation of two DC-link capacitors in a VIENNA
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
