Subcode Subject Name Sem Degree PX5071 WIND ENERGY CONVERSION SYSTEMS III M.E. POWER ELECTRONICS & DRIVES, M.E.POWER SYSTEMS EEE V.BALASUBRAMANIAN Branch Staff Name Date of Updation Part Unit Group A A A A A 1 1 1 1 1 A A 17:9:18 Question 1 1 1 1 1 Q. No 1 2 3 4 5 1 1 2 2 1 2 List out advantages and limitations of WECS. What are the importance of TSR while designing a wind turbine? A A 1 1 2 2 3 4 What is Betz limit? A 1 2 5 Write the formula for power obtained from wind. B 1 1 1 Explain in detail about sabinin’s theory of ideal wind turbine. Differentiate BETZ and SABININ’S theory. What is nacelle? What is the use of wind vane in the wind turbine? What is swept area of wind turbine? Compare HAWT and VAWT. List out various wind energy conversion schemes. Derive the sabinin’s limit of power coefficient Cp. B 1 1 2 Explain in detail about simple momentum theory? B 1 1 3 Draw the block diagram shows the various component of wind turbine and explain function of each part. B 1 1 4 Derive the equation for power obtained from the wind from the first principles. B 1 2 1 What are the various attributes to be taken care in the aerodynamically designed wind turbine? Explain in detail. B 1 2 2 Derive the Betz limit of power coefficient Cp of an ideal wind turbine. B 1 2 3 What are the details of C-WET’s certification of wind turbines? B 1 2 4 What are the environmental impacts of wind power? Explain each case in detail. A A 2 2 1 1 1 2 ………….. Define thrust force, angle of attack. Define lift and drag force of an wind mill. A 2 1 3 What is lift and drag coefficient? A 2 1 4 List out the factors to be considered for rotor selection of WPP. A 2 1 5 Define stall control of wind turbine. A 2 2 1 What is yaw control of wind turbine? A 2 2 2 What is pitch control of wind turbine? A 2 2 3 Define tip speed ratio, laminar flow, turbulent flow. A 2 2 4 Compare the performance of 3 blade and 4 blade WPP. A 2 2 5 Draw the different blade profile for the different TSR. 1 ………. Explain the step by step procedure for designing the blade of a B 2 1 wind mill. B 2 1 2 Explain the factors affecting the performance rotor of a wind mill with necessary graphs and curves. B 2 1 3 Derive the formula for thrust force and TSR. B 2 1 4 Explain in detail about the lift force, drag force, different loads acting on the rotor blades with necessary diagrams and equations. B 2 2 1 Explain in detail different pitching mechanisms of wind mill. B 2 2 2 Explain in detail about active stall controlled WPP and passive stall controlled WPP. B 2 2 3 Explain the various features of pitch controlled WPP and stall controlled WPP. B 2 2 4 Explain the various requirements of Power Electronic Converters for the WPP applications. A 3 1 1 ………. What are the assumptions used in steady state stability analysis of wind mill generator model? A 3 1 2 What are the assumptions used in transient state stability analysis of wind mill generator model? A 3 1 3 Define short circuit ratio of generator. A 3 1 4 What are the advantages and disadvantages of fixed speed WECS? A 3 1 5 Compare fixed speed WECS and variable speed WECS. A 3 2 1 Define wind modeling. A 3 2 2 Compare SCIG and DFIG. A 3 2 3 Compare conventional synchronous machine and PMSG. A 3 2 4 Define weibull and rayliegh distribution for wind speed modeling. A 3 2 5 Draw the speed torque characteristics of induction machine. B 3 1 1 ………… Explain the different factors to be considered for choosing the generator for wind mill applications. B 3 1 2 Explain steady state stability analysis for generator model for wind mill application. B 3 1 3 Explain transient state stability analysis for generator model for wind mill application. B 3 1 4 Explain different methods used for modeling of wind with necessary equations and tabulations of data. B 3 2 1 Derive the torque equation of induction machine and deduce step by step equivalent circuit of it. B 3 2 2 Explain different types of drive train modeling of wind turbine with neat diagram and relationships of various parameters. B 3 2 3 Draw the block diagram for the implementation of constant speed constant frequency based WECS and explain the function of each block in it. B 3 2 4 Explain different type of turbines used for constant speed WECS. A A A A A A A A A 4 4 4 4 4 4 4 4 4 1 1 1 1 1 2 2 2 2 1 2 3 4 5 1 2 3 4 A 4 2 5 ……….. What are the features of variable speed WECS? Compare fixed speed WECS and variable speed WECS. What is the need for variable speed WECS? What are the pros and cons of variable speed WECS? List out features of DFIG used for WECS. List out the features of PMSG used for WECS. Compare DFIG and PMSG. Draw the wind power versus wind speed characteristics curve. Draw the block diagram of variable speed constant frequency WECS. Write down the formula for capacity factor. B B 4 4 1 1 1 2 B 4 1 3 B 4 1 4 B 4 2 1 B 4 2 2 ………. Deduce the equivalent circuit of induction machine. Derive the torque equation of induction machine. Derive the torque equation of induction machine and deduce step by step equivalent circuit of it. Prove P2:Pm:Prot.cu.loss = 1:(1-s):s Explain the equivalent circuit of PMSG with all of its parameters. Draw the block diagram of variable speed variable frequency systems and explain the function of each block in it. Explain the mathematical modeling of DFIG with necessary equations. B 4 2 3 B 4 2 4 A 5 1 1 A A A A 5 5 5 5 1 1 1 1 2 3 4 5 A A A A A 5 5 5 5 5 2 2 2 2 2 1 2 3 4 5 B 5 1 1 B 5 1 2 B 5 1 3 B B 5 5 1 2 4 1 B 5 2 2 B 5 2 3 B 5 2 4 Explain the mathematical modeling of PMSG with necessary equations. Describe the features of variable speed WECS and explain how it is advantageous than the fixed speed WECS. ……… What are the interconnection requirements for wind power plants? Name any two issues of grid connection. What is LVRT? How are wind power systems classified? What are the major problems related to grid interconnection? What are the advantages of grid connected systems? What is voltage dip and voltage swell? Define voltage sag. Define sub synchronous resonance SSR in power grid. What is matrix converter? ……….. Explain LOW VOLTAGE RIDE THROUGH control strategy of grid connected variable speed wind turbine generator system. Explain the choice of generators for fixed speed systems and derive the model of synchronous generator for wind speed. Derive the power wind speed characteristics of variable speed systems. Write the short notes on DFIG in variable speed systems. Derive the modeling for variable speed generators. Also explain variable speed and variable frequency schemes with necessary diagrams. What is meant by stand alone WECS system? Explain about the issues of grid connection. Explain in detail about (i) machine side controllers and (ii) grid side controllers. Explain wind energy storage systems and hybrid systems. ……….. C C 3 3 1 2 C 3 3 Explain all methods of pitch control techniques of a wind mill. Explain all types of towers used for wind mill with diagram. List out pros and cons of each type. Explain the complete operation of matrix converter used for wind mill applications. ……….. Note : Name of the file should be same as subject code [for example BA5201.doc] Last date to submit the question bank at exam office for I Yr PG – 13.04.2018 (All Units) PART – C – Not Applicable for Mathematics Paper. For case study & comprehensive type of questions, there will be no choice. PRINCIPAL
