ABSTRACT:
This paper presents a power factor correction (PFC)
based bridgeless-canonical switching cell (BL-CSC) converter fed brushless DC
(BLDC) motor drive. The proposed BL-CSC converter operating in a discontinuous
inductor current mode is used to achieve a unity power factor at the AC mains using
a single voltage sensor. The speed of BLDC motor is controlled by varying the
DC bus voltage of the voltage source inverter (VSI) feeding BLDC motor via a
PFC converter. Therefore, the BLDC motor is electronically commutated such that
the VSI operates in fundamental frequency switching for reduced switching
losses. Moreover, the bridgeless configuration of CSC converter offers low
conduction losses due to partial elimination of diode bridge rectifier at the
front end. The proposed configuration shows a considerable increase in efficiency
as compared to the conventional scheme. The performance of the proposed drive
is validated through experimental results obtained on a developed prototype. Improved
power quality is achieved at the AC mains for a wide range of control speeds
and supply voltages. The obtained power quality indices are within the
acceptable limits of IEC 61000-3-2.
KEYWORDS:
1.
BLDC Motor
2.
BL-CSC
Converter
3.
DICM
4.
PFC
5. Power Quality
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig.
1. Proposed BL-CSC converter fed BLDC motor drive
EXPECTED SIMULATION RESULTS:
Fig.
2. Performance of the proposed drive at rated condition with supply voltage as
220V and DC link voltage as (a) 310V and (b) 70V.
Fig.
3. Waveforms of (a) inductor’s currents and (b) intermediate capacitor voltage
with supply voltage at rated load on BLDC motor with DC link voltage as 310V
and supply voltage as 220V.
Fig.
4. Stress on PFC converter switches and its enlarged waveforms during its
operation at rated conditions.
Fig.
5. Recorded dynamic performance of the proposed drive at rated load on BLDC
motor during (a) starting at Vdc=50V, (b) speed control during change in DC
link voltage from 100V to 170V and (c) sudden change in supply voltage from
250V to 180V.
CONCLUSION:
A
PFC based BL-CSC converter fed BLDC motor drive has been proposed with improved
power quality at the AC mains. A bridgeless configuration of a CSC converter
has been used for achieving reduced conduction losses in PFC converter. The speed
control of BLDC motor and power factor correction at AC mains has been achieved
using a single voltage sensor. The switching losses in the VSI have been
reduced by the use of fundamental frequency switching by electronically commutating
the BLDC motor. Moreover, the speed of BLDC motor has been controlled by
controlling the DC link voltage of the VSI. The proposed drive has shown an
improved power quality at the AC mains for a wide range of speed control and supply
voltages. The obtained power quality indices have been found within the
acceptable limits of IEC 61000-3-2. A satisfactory performance of the proposed
drive has been obtained and it is a recommended solution for low power applications.
REFERENCES:
[1]
B. Singh and S. Singh, “Single-phase power factor controller topologies for
permanent magnet brushless DC motor drives,” IET Power Elect., vol.3,
no.2, pp.147-175, March 2010.
[2]
Chang Liang Xia, Permanent Magnet Brushless DC Motor Drives and Controls,
Wiley Press, Beijing, 2012.
[3]
P. Pillay and R. Krishnan, “Modeling of permanent magnet motor drives,” IEEE
Trans. Ind. Elect., vol.35, no.4, pp.537-541, Nov 1988.
[4]
M. A. Rahman and P. Zhou, “Analysis of brushless permanent magnet synchronous
motors,” IEEE Trans. Ind. Elect., vol.43, no.2, pp.256-267, Apr 1996.
[5]
J. Moreno, M. E. Ortuzar and J.W. Dixon, “Energy-management system for a hybrid
electric vehicle, using ultra capacitors and neural networks,” IEEE Trans.
Ind. Elect., vol.53, no.2, pp. 614- 623, April 2006.
