ABSTRACT
Presented
is pulse-width modulation (PWM) for single-phase five-level inverter via field-programmable
gate array (FPGA). The proposed inverter has conventional full bridge configuration
and one bidirectional switch. The control technique is digitally generated
based on multicarrier PWM in Altera DE2 board, which has many features that allow
implementation of the system design through Cyclone II FPGA device. A
sinusoidal reference signal and two triangular carrier signals in phase and of
the same frequency but different offset voltages were used to generate the PWM
signals for the inverter switches. Besides Altera Quartus II software,
Matlab/Simulink software was used to simulate and verify the proposed circuit before
it was implemented in a prototype hardware. Simulation and experiment results
closely agreed.
KEYWORDS:
1. Pulse-width
modulation (PWM)
2. FPGA
3. Multilevel inverter.
SOFTWARE: MATLAB/SIMULINK
CIRCUIT
DIAGRAM:
Figure
1. The five-level inverter equipped with LC filter and a resistive
load.
EXPECTED SIMULATION RESULTS:
Figure 2. Simulation results for
PWM switching patterns on (a)Quartus II, (b) Matlab/Simulink.
Figure 3. Simulation result for the
dead-time designed on Quartus II.
Figure
4. Simulation result for the output voltage waveforms, before and after
filtering.
Figure
5, Simulation result for the output voltage and load current waveforms.
Figure 6. THD of the filtered ac
voltage.
CONCLUSION
PWM
switching patterns were applied to the proposed inverter switches to produce a
five-level output voltage. Altera FPGA enabled fast, flexible design and
implementation. Simulation and experiment results were satisfactory for pulse generation,
the five-level output voltage and the filtered output voltage and current.
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