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Implementing Power Factor Correction in AC/DC Converters
Published in Fang Lin Luo, Hong Ye, Power Electronics, 2018
The VIENNA rectifier can be used to improve the PF of a three-phase rectifier. The critical input inductor is calculated for the nominal load condition, and both PF and THD are degraded in the low-output power region. A novel strategy implementing reference compensation current is proposed on the basis of the operation principle of the VIENNA rectifier in this section. This strategy can realize a three-phase three-level UPF rectifier. With the proposed control algorithm, the converter draws high-quality sinusoidal supply currents and maintains good DC-link voltage regulation under wide load variation. Theoretical analysis is initially verified by digital simulation. Finally, experimental results of a 1-kVA laboratory prototype system confirm the feasibility and effectivity of the proposed technique.
Power Factor Correction Implementing in AC/DC Converters
Published in Fang Lin Luo, Hong Ye, Renewable Energy Systems, 2013
The VIENNA rectifier can be used to improve the power factor of a three-phase rectifier. However, its “critical input inductor” is calculated for the nominal load condition, and both the power factor and total harmonic distortion are degraded in a low-output power region. A novel strategy implementing reference compensation current is proposed based on the operation principle of VIENNA rectifier in this section. This strategy can realize the three-phase three-level UPF rectifier. With the proposed control algorithm, the converter draws high-quality sinusoidal supply currents and maintains good DC-link-voltage regulation under wide load variation. Theoretical analysis is initially verified by digital simulation. Finally, experimental results of a 1 kVA laboratory prototype system confirm the feasibility and effectiveness of the proposed technique.
Maximum Power Tracking and Power Sharing in Grid Connected WECS Using Modified PFC Rectifier and PR Controlled Inverter
Published in Electric Power Components and Systems, 2020
Teena George, Jayaprakash Pychadathil
Figures 13 and 14 depict the experimental results. Figure 13 shows the performance of the generator and UPF rectifier for three different wind speeds. It is clear that with an increase in wind speed, generated voltage and current increases. The Vienna rectifier allows the voltage and current waveforms to remain its sinusoidal profile with reduced THD. Figure 14 shows the performance of PR controlled SRF based inverter at the grid side with the nonlinear load. The current injection from WECS to grid increases with an increase in wind speed, and also it acts as DSTATCOM, which makes the grid current sinusoidal.