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Previous Year Exam Questions for Advanced Power Electronics - APE of 2018 - bput by Bput Toppers

  • Advanced Power Electronics - APE
  • 2018
  • PYQ
  • Biju Patnaik University of Technology BPUT - BPUT
  • Electrical Engineering
  • B.Tech
  • 43 Offline Downloads
  • Uploaded 1 year ago
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Registration No : Total Number of Pages : 02 B.Tech. PEEE 5410 8th Semester Regular / Back Examination 2017-18 ADVANCED POWER ELECTRONICS BRANCH : EEE, ELECTRICAL Time : 3 Hours Max Marks : 70 Q.CODE : C556 Answer Question No.1 which is compulsory and any five from the rest. The figures in the right hand margin indicate marks. Answer all parts of a question at a place. Q1 a) b) c) d) e) f) g) h) i) j) Q2 a) b) Q3 a) b) Q4 a) b) Answer the following questions: What is the advantage of half bridge converter compared to full bridge one? What will be the maximum duty ratio in a forward converter with primary and demagnetising winding having turn ratio 1:4 ? Why is flyback converter more commonly used in the discontinuous mode? What is the input output voltage relationship of a cuk converter? What is the maximum line voltage you will get at the output of 3 phase Voltage Source Inverter controlled by Sin PWM technique, if its input dc link voltage is 400 V? What is the importance of null vectors in space vector PWM control What is the effect of frequency ratio on the relative harmonic content in a Sinusoidal PWM Converter? What are the advantages and limitations of Zero Voltage Switched (ZVS) inverter? What is the role of energy storage components in the grid connected renewable energy generation system? Mention some energy storage system used in conjunction with renewable energy sources with their interconnection to the utility grid. (2 x 10) Draw the circuit diagram of a practical forward dc-dc converter and explain the operation of this converter illustrating the function of each component used. In a Flyback converter, the supply coltage is 250V dc and required output voltage is 50 V dc. Calculate i. transformer turn ratio ii. switch duty ratio iii. peak transistor voltage (4) Explain with relevant circuit diagram and waveforms, the working of a series resonant converter with PWM method of control for the condition of f < fr where fr is the resonant frequency of the converter circuit. The supply voltage to a half bridge converter is 250 V dc and required output power is 200W. The operating frequency is 20 kHz. Calculate the value of the capacitor of the bridge to limit the output voltage ripple to within 20% (5) How is hysteresis band width decided in hysteresis band current control PWM? Explain with relevant circuit diagram and waveforms. Determine the number of notches and the notch angles of a multiple notch harmonic elimination PWM pattern such that the 5thand 11th harmonics are eliminated. (5) (6) (5) (5)

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Q5 a) b) Q6 a) b) Q7 a) b) Q8 a) b) c) d) Explain the principle of operation of diode clamped type Three Level Voltage Source Inverter showing the relevant circuit diagram and switching control strategy. Explain the principle of sigma delta modulation strategy as applied to Voltage Source Inverter. (5) Explain with relevant circuit diagram and waveforms the working principle of load commutated inverter. Explain the operation of Matrix Converter with relevant circuit diagram and waveforms with control strategy.. (5) With block diagram and relevant waveforms, explain the control characteristics of HVDC converters. How are the issues of interconnection of renewable energy sources to the utility grid addressed? Explain in brief. (5) Write short answer on any TWO : Multi output boost converter Selected harmonic elimination PWM Resonant inverter Active harmonic filter (5) (5) (5) (5 x 2)

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