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Content beyond syllabus power electronics
- 1. 1 Sem.: Sec.: Course: Content delivered: Date of delivery: Faculty: 7th , Asec Power Electronics Power electronics circuit simulation and analysis MATLAB/Simulink 21st Aug 2017 Dr. B. G. Shivaleelavathi ContentbeyondsyllabusPowerElectronics: C403.5 Apply computer skills (e.g., PSPICE and MATLAB/Simulink) for the simulated analysis and design of Power Electronic circuits. L3 Q. No. Topic COs 1 MATLAB/Simulink SimulationStudy and Analysis of Harmonics Generation in Uncontrolled and Controlled Rectifier Converters. (i) Simulate a Full wave bridge uncontrolled rectifier in Simulink for R and RL load and analyze for harmonic contents in the rectifier output voltage waveform. (ii) Simulate an controlled Full wave bridge Fully Controlled Rectifier in Simulink for R and RL load and analyze for harmonic contents in the rectifier output voltage waveform.(with and without free wheeling diode). (iii) Perform a comparative analysis for the above two cases and give your conclusion. C403.5 Solution: Full Wave Diode Rectifier Continuous powergui1 v + - Voltage Measurement1 output voltage1 v + - Voltage Measurement1 V1 Scope1 RL load1 m a k D8 m a k D7 m a k D6 m a k D5 i + - Current Measurement1 DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING JSS ACADEMY OF TECHNICAL EDUCATION JSS Campus, Dr. Vishnuvardhana Road, Bengaluru - 560060.
- 2. 2 Simulink model of Single Phase Full Wave (Uncontrolled) Bridge Rectifier--SPFBR SPFBRdiode rectifier with RL load FFT analysis of SPFBR (Diode)with RL Load 0 0.02 0.04 0.06 0.08 0.1 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s)
- 3. 3 (ii)Single Phase Controlled Rectifier (using SCR)---SPFBR Single phase Bridge Contolled Rectifier Low Inductive Effect High Inductive Effect Low inductance with free wheelingHigh inductance with free wheeling Resistive load Discrete, Ts = 5e-006 s. powergui v+ - v + -v + - v + - v + - Single phase Pulse Generator P1 P2 Subsystem [P2] [P1] [P1] [P2] [P2] [P1] [P1] [P2] [P2] [P2] [P1] [P2] [P1] [P1] [P2] [P2] [P1] [P1] [P2] [P2] [P1] [P1] m a k m a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k g a k i + - i + - i +- i +- i +-
- 4. 4 (ii)Single Phase Controlled Rectifier (using SCR)---SPFBR SPFBR with resistive load FFT analysis of SPFBR with Resistive load 0 0.02 0.04 0.06 0.08 0.1 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s) 0 200 400 600 800 1000 0 20 40 60 80 100 Frequency (Hz) Fundamental (100Hz) = 112.7 , THD= 31.88% Mag(%ofFundamental) 0 0.02 0.04 0.06 0.08 0.1 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s)
- 5. 5 SPFBR with resistive inductive(low) load. FFT SPFBR with resistive inductive(low) load without free wheeling load 0 0.02 0.04 0.06 0.08 0.1 -100 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s) 0 200 400 600 800 1000 0 20 40 60 80 100 Frequency (Hz) Fundamental (100Hz) = 127.6 , THD= 47.81% Mag(%ofFundamental) 0 0.02 0.04 0.06 0.08 0.1 -100 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s)
- 6. 6 SPFBR with resistive inductive(high) load. FFT SPFBR with resistive inductive(high) load without freewheeling diode. 0 0.02 0.04 0.06 0.08 0.1 -100 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s) 0 200 400 600 800 1000 0 20 40 60 80 100 Frequency (Hz) Fundamental (100Hz) = 127.6 , THD= 47.80% Mag(%ofFundamental) 0 0.02 0.04 0.06 0.08 0.1 -100 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s)
- 7. 7 SPFBR with resistive inductive(high) load with Freewheeling diode. SPFBR with resistive inductive(high) load with Freewheeling diode. SPFBR with resistive inductive(low) load with freewheeling diode. 0 0.02 0.04 0.06 0.08 0.1 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s) 0 200 400 600 800 1000 0 20 40 60 80 100 Frequency (Hz) Fundamental (100Hz) = 112.9 , THD= 32.02% Mag(%ofFundamental) 0 0.02 0.04 0.06 0.08 0.1 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s)
- 8. 8 FFT SPFBR with resistive inductive(low) load with freewheeling diode. 0 0.02 0.04 0.06 0.08 0.1 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s) 0 200 400 600 800 1000 0 20 40 60 80 100 Frequency (Hz) Fundamental (100Hz) = 112.9 , THD= 32.04% Mag(%ofFundamental) 0 0.02 0.04 0.06 0.08 0.1 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s)
- 9. 9 Conclusion: The above simulation results are tabulated as below: SPFBR diode uncontrolled RL α = 00 SPFBR Controlled R α = 300 SPFBR Controlled. α = 300 RL (Low) Without FWD SPFBR Controlled α = 300 RL(Low) with FWD SPFBR Controlled α = 300 RL(High) without FWD SPFBR Controlled α = 300 RL(High) with FWD Vodc 144.8volts 135.9volts 126volts 135.7volts 126.7volts 135.6volts THD 22.73 31.88 47.81 32.04 47.81 32.04 From the above comparative table we conclude: In fully controlled rectifier the DC output voltage reduces with RL Load. And THD also increases. Fully controlled rectifier the sue of Free Wheeling Diode (FWD) increases the DC output voltage and also reduces the Total Harmonic Distortion (THD). And the DC output voltage and THD are same as Resistive load. Note: the firing angle can be set in the single phase pulse generator system block. α(Alpha) can be varied from 0o to 180o . SPFBR with Resistive / RL load with Firing angle alpha = 0o , Vodc = 145.6, THD=22.72 0 0.02 0.04 0.06 0.08 0.1 0 100 200 Selected signal: 10 cycles. FFT window (in red): 10 cycles Time (s)
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