ABSTRACT:
The brushless DC (BLDC) motor has
numerous applications in high-power systems; it is simple in construction, is cheap,
requires less maintenance, has higher efficiency, and has high power in the
output unit. The BLDC motor is driven by an inverter. This paper presents
design and simulation for a three-phase three-level inverter to drive the BLDC
motor. The multilevel inverter is driven by discrete three-phase pulse width
modulation (DPWM) generator that forced-commuted the IGBT’s three-level
converters using three bridges to vectored outputs 12- pulses with three levels.
Using DPWM with a three-level inverter solves the problem of harmonic
distortions and low electromagnetic interference. This topology can attract
attention in high-power and high-performance voltage applications. It provides
a three-phase voltage source with amplitude, phase, and frequency that are
controllable. The proposed model is used with the PID controller to follow the reference
speed signal designed by variable steps. The system design is simulated by
using Matlab/Simulink. Satisfactory results and high performance of the control
with steady state and transient response are obtained. The results of the
proposed model are compared with the variable DC-link control. The results of
the proposed model are more stable and reliable.
KEYWORDS:
1.
Brushless DC Motor
2.
Multilevel Inverter
3.
High-Performance Drive
4.
Pulse Width Modulation (PWM)
5.
Maltlab
6.
Simulink
SOFTWARE:
MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Figure 1. BLDC motor with MLI driven with PID controller.
EXPECTED SIMULATION RESULTS:
Figure. 2. Output of three-phase three-level inverter with DPWM.
Figure 3. The sample from output of the DPWM
Figure 4. Analysis of response for the proposed MLI with PID controller of BLDC
motor.
Fig. 5. Two outputs of controllers with proposed MLI and
variable DC-link
CONCLUSION:
The proposed MLI performance analysis
was successfully presented by using Matlab/Simulink software. The proposed topology
can be easily extended to a higher-level inverter. The simulation results were
sine waves and exhibited fewer ripples and low losses. This system would show
its feasibility in practice. The vector control was described in adequate
detail and was implemented with a three-level MLI. This method enabled the
operation of the drive at zero direct axis stator current. Transient results
were obtained when a DPWM was started from a standstill to a required speed.
The performance of the vector control in achieving a fast reversal of PDPWM even
at very high speed ranges is quite satisfactory. The performance of the
proposed three-phase MLI was investigated and was found to be quite
satisfactory. A comparison was made between the PID controller–based proposed
model MLI and the controller with variable DC-link voltage. The results showed
that the proposed model responded better in transient and steady states and was
more reliability with high performance.
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