JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III WIND AND SOLAR ENERGY SYSTEMS Previous Question Paper (February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What are the disadvantages of wind power?
Answer
The primary disadvantages of wind power include the intermittency and variability of wind speeds, which make power generation unpredictable and require energy storage or backup systems. Additionally, wind farms can have negative environmental and aesthetic impacts, such as noise pollution, visual disturbance, and potential risks to local bird and bat populations. Furthermore, wind energy sites are often located in remote areas, necessitating significant investment in transmission infrastructure to transport electricity to load centers.
What is the principle of wind power generation?
Answer
The principle of wind power generation is based on the conversion of kinetic energy present in moving air (wind) into mechanical energy and subsequently into electrical energy. When wind strikes the blades of a wind turbine, it exerts an aerodynamic force that creates lift and drag, causing the rotor to rotate. This mechanical rotation is transmitted through a shaft, often connected to a gearbox to increase the rotational speed, which then drives an electrical generator. The generator uses electromagnetic induction to convert the mechanical energy into usable electrical power.
In this equation, P is the power extracted, ρ is the air density, A is the swept area of the blades, v is the wind velocity, and Cp is the power coefficient representing the efficiency of the turbine.
Draw the induction generator torque speed characteristics and brief.
Answer
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What is the need for Power electronics converters in wind energy technology?
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What is beam and diffused radiation?
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Draw and brief the V-I characteristics of a PV cell.
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List out the advantages of hybrid operation of solar and wind energy systems.
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What are the major Network Integration Issues of Wind energy system?
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Draw the Parabolic trough collector diagram.
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Compare Flat plate and Paraboloidal types of solar collectors.
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Part B
Discuss in detail about Wind power-cumulative distribution functions.
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Describe with a neat sketch the working of wind energy system with main components.
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From fundamentals derive the expression for Betz limit ratio.
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With neat and necessary diagrams, explain the working principle of doubly fed Induction Generator.
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Discuss in detail about the differences between fixed speed and variable speed wind turbines.
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With neat and necessary diagrams, explain the working principle of Permanent Magnet Synchronous Generator.
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With neat and necessary diagrams, explain about the power electronic converters used in wind energy conversion.
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With suitable example, explain the estimate the solar energy availability.
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What do you understand about solar radiation spectra? Explain in detail.
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Classify the Power Electronic Converters used for Solar Systems and explain any one control technique.
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Discuss in detail about the grid code technical requirements: real and reactive power Regulation.
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Discuss in detail about isolated operations of solar PV and wind systems.
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Discuss in detail about solar PV and wind farm behavior during grid disturbances.
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With neat and necessary diagrams, explain the construction and working of parabolic dish, and Fresnel solar collectors.
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Explain the construction and working of central receivers system.
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With neat and necessary diagrams, explain the construction and working of solar pond.
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