power electronics assignment
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Document submitted for assessment in Power Electronic CourseTRANSCRIPT
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Assignment #: 3
Simulation of single and three phase converters using MATLAB Simulink
By
Muhammad Anwer Nazir (GS34907)Jabir Malik (GS35125)Rahman lateef (GS34124)Sani Dahiru Buba (GS34084)
Course Code: EEE5301Course Title: Power Electronic ConvertersLecturer: Prof. Ishak Aris
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Question No. 1 (6.2)
Figure 1 Simulink circuit diagram of a single phase converter
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Figure 2 Input voltage waveforms
Figure 3 (a) Output current waveform
Figure 3 (b) Output voltage waveform
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The diagram in Figure 1 shows a single phase full wave bridge rectifier constructed using MATLAB
Simulink. It consists of four thyristors connected back to back with a pair (T1 and T3, T2 and T4)
conducting during each half cycle. Two stray inductances Ls1 and Ls2 are connected in series with the supply
Vs (source side) and another inductance Ld in the load side. When α is varied between 0 to 900 the converter
operates in the rectifier mode and transfers power to the load. However, if α is greater than 900 but less than
1800 the converter operates in the inverter mode and transfer power back to the source. The input and output
waveforms are shown in Figures 2 and 3.
Question No. 2 ( 6.3)
Figure 4 Simulink circuit diagram of three phase converter
The circuit of Figure 4 shows a three phase converter constructed using MATLAB Simulink. It consists of six thyristors with a pair conducting for 1200 of a complete cycle. Each thyristor is triggered separately but in sequence. The input and output waveforms are shown in Figures 5 and 6.
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Figure 5 Input waveform
Figure 6 Output waveforms
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Conclusion
Single and three phase power converters have been studied using MATLAB Simulink. The performance of
the two converters was observed by changing the firing angle of the thyristor. The aim of the exercise has
been achieved by the simulation experience acquired. Also, the exercise has inspired us to develop more
interest in power converters.
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