Power Factor Correction Using Single Stage Discontinuous Conduction Mode Booster Rectifier
A single stage three-phase power factor correction circuit using a boost input current shaper has been described in both simulation and experimental work. To reduce the cost and avoid complexity the boost dc-to-dc converter is operated in discontinuous conduction mode using only one active switch...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
2003
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/12214/1/FK_2003_53.pdf |
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| Summary: | A single stage three-phase power factor correction circuit using a boost input current
shaper has been described in both simulation and experimental work. To reduce the
cost and avoid complexity the boost dc-to-dc converter is operated in discontinuous
conduction mode using only one active switch. A low cost harmonic injection
method for single switch three-phase DCM boost rectifiers has been simulated and
tested. In this method, a periodic voltage which is proportional to the inverted ac
component of the rectified three-phase line-to-line input voltage is injected in the
control circuit to vary the duty cycle of the rectifier switch within a line cycle, so that
the fifth-order harmonics of the input current is reduced to meet THD<10%
requirement.The analysis of the injected signal and modified harmonic currents of the rectifier has
been presented and verified on a laboratory prototype. Based on the equivalent multimodel
an average small signal model of the boost power stage is developed and
verified by simulation. The variations of the small signal model against load are
demonstrated, and the compensator designed for constant switching frequency PWM
is discussed. The simulated results show that at light load, the dominant pole of the
control-to-output transfer function approaches the origin and causes more phase
delay, complicating the control design circuit. To avoid the no load case and simplify
the control design, a dummy is added.
The single stage three-phase boost power factor correction with improved input
current distortion has been simulated using OrCad release 9.1 software. The results
show there is an agreement between the simulation and experimental work. |
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