B.TECH - Semester 8 power electronics applications in power systems Question Paper 2021 (feb)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Define Harmonic Factor.
- Draw the phase to neutral voltage of a star connected load in a 3 phase voltage source inverter working in $120^{\circ}$ conduction mode.
- Distinguish between unipolar and bipolar operation of a bridge inverter.
- Draw the circuit of a line commutated inverter.
- What are the constructional differences between power frequency and high frequency transformers?
- What is meant by slip energy recovery?
- What are the key features of a solar PV Grid-connected system?
- What is meant by a static var compensator?
- Differentiate between series and shunt compensation.
- Can both series and shunt compensation be combined? What do you call such a system? $$ \text { ( } 10 \times 2=20 \text { Marks) } $$ P.T.O. Answer one full questions from each Module.
- (a) Obtain the frequency spectrum of a square wave inverter using Fourier analysis. Assume $v_{d c}$ is the peak of the square wave.
- (b) Explain biopolar modulation in single phase bridge inverter.
- (a) Describe Space vector modulation applied to 3-phase voltage source inverters.
- (b) Draw the diagram of a diode clamped three level inverter.
- Explain the working of a solar PV system with line commutated inverter for grid connection. Describe the method of controlling the active power injected into the grid, in this system.
- What is meant by Maximum Power Point Tracking in a solar system? Explain how it is implemented with the help of a flowchart.
- Explain with the help of circuit diagrams, how the varying frequency voltage obtained from a wind generator is converted into constant frequency for grid connection using power electronic converter.
- Explain the working of a slip energy recovery based wind energy generation scheme with necessary diagrams. What are the advantages and limitations of this scheme?
- Draw the block diagram of the control scheme of a STATCOM and explain its operation.
- Explain the working of a series compensator circuit diagram, waveforms and control scheme. $$ \text { ( } 4 \times 20=80 \text { Marks) } $$