A horizontal-axis two-blade wind turbine feeds power to the grid through a doubly-fed induction generator (DFIG)...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A horizontal-axis two-blade wind turbine feeds power to the grid through a doubly-fed induction generator (DFIG) operating with slip power control. The grid frequency is 50 Hz and the generator has 6 poles. The diameter of the wind turbine is 50 m and the maximum blade efficiency is 48% at tip speed ratio (TSR) of 5.5. The gearbox has a speed ratio of 45 and efficiency of 90%. The air density at the hub height is 1.22 kg/m³. If the wind turbine is operating at maximum efficiency and the wind speed at the hub. height is 12 m/s, (a) Determine the power of the wind and the mechanical power in kW at the rotor of the induction generator (high-speed shaft). (5 Marks) Calculate the slip of the induction generator and the slip power (Ps). Under this operation mode, are the power converters processing electric power from the rotor to the grid or vice versa? Justify your answer. (8 Marks) (b) (c) The hub height of this wind turbine is 80 m and the air temperature is 4°C. Determine the altitude of the terrain with respect to the mean sea level. Consider the following expression: pression TANIMA -00341 212 353 T MOTEPT300M - HEA e HTTW 21/T2Y? (4 Marks) (d) Comment on two advantages and two drawbacks of two-blade wind turbines with word respect to three-blade wind turbines when used for electricity generation. MlingA (4 Marks) (e) In the context of horizontal-axis wind turbines, sketch an upwind configuration and a downwind configuration. Comment on the main advantage and the main disadvantage of downwind turbines with respect to upwind turbines. q aid (4 Marks) VEMA A horizontal-axis two-blade wind turbine feeds power to the grid through a doubly-fed induction generator (DFIG) operating with slip power control. The grid frequency is 50 Hz and the generator has 6 poles. The diameter of the wind turbine is 50 m and the maximum blade efficiency is 48% at tip speed ratio (TSR) of 5.5. The gearbox has a speed ratio of 45 and efficiency of 90%. The air density at the hub height is 1.22 kg/m³. If the wind turbine is operating at maximum efficiency and the wind speed at the hub. height is 12 m/s, (a) Determine the power of the wind and the mechanical power in kW at the rotor of the induction generator (high-speed shaft). (5 Marks) Calculate the slip of the induction generator and the slip power (Ps). Under this operation mode, are the power converters processing electric power from the rotor to the grid or vice versa? Justify your answer. (8 Marks) (b) (c) The hub height of this wind turbine is 80 m and the air temperature is 4°C. Determine the altitude of the terrain with respect to the mean sea level. Consider the following expression: pression TANIMA -00341 212 353 T MOTEPT300M - HEA e HTTW 21/T2Y? (4 Marks) (d) Comment on two advantages and two drawbacks of two-blade wind turbines with word respect to three-blade wind turbines when used for electricity generation. MlingA (4 Marks) (e) In the context of horizontal-axis wind turbines, sketch an upwind configuration and a downwind configuration. Comment on the main advantage and the main disadvantage of downwind turbines with respect to upwind turbines. q aid (4 Marks) VEMA
Expert Answer:
Related Book For
Posted Date:
Students also viewed these accounting questions
-
A wind turbine with a blade diameter of 50 m is to be installed in a location where average wind velocity is 7.5 m/s. The average temperature and pressure of ambient air in this location are 23oC and...
-
A wind turbine with a blade diameter of 25 m is to be installed in a location where average wind velocity is 6 m/s. If the overall efficiency of the turbine is 34 percent, determine (a) The average...
-
A horizontal-axis wind turbine has a diameter of 50 m and faces air coming at it at 20 miles per hour. If the density () of air is estimated as 1.1 kg/m3, determine the mass flow rate of air through...
-
Under unit-based absorption costing systems, are high- or low-volume products overcosted? Why?
-
Compare spontaneous emission to stimulated emission.
-
Platinum Pipeline Inc. needs a Caterpillar D6T dozer to install water and sewer lines. How does its fixed cost change if it can rent a dozer rather than buy one?
-
For each of these five separate cases, identify the principle of internal control that is violated. Recommend what the business should do to ensure adherence to principles of internal control. 1....
-
Jarriot, Inc., presented two years of data for its Furniture Division and its Houseware Division. Furniture Division: Houseware Division: Required: 1. Compute the ROI and the margin and turnover...
-
A company that manufactures recreational pedal boats has approached Richard Cichanowski to ask if he would be interested in using Current Designs' rotomold expertise and equipment to produce some of...
-
1. East Coast Yachts uses a small percentage of preferred stock as a source of financing. In calculating the ratios for the company, should preferred stock be included as part of the companys total...
-
of side 10 cm and carries a current of 50 A. It is placed A wire is bent in the form of an equilateral triangle PQR in a magnetic field B of magnitude 20 T directed perpendicularly to the plane of...
-
For pipe flow, can you give a simplified form of the Reynolds transport equation?
-
Fill in the Blank. Systems undergo dangerously large oscillations at ________.
-
What are the conditions for the Existence of Bernoulli integrals? Write the ideal incompressible fluid, with gravity as mass force, steady flow, energy equation per unit mass, and explain the...
-
Write the energy equation for an ideal incompressible fluid, without mass force, steady flow, unit mass, and explain the physical meaning of each.
-
What is the velocity change of flow with and without mass force? Please use specific examples to illustrate this.
-
Barclays Bank bought swap with 3 years to expiration from a hedge fund. The expected value of the swap and the probabilities of default are given below: Year Expected value of swap to bank ($...
-
1. Following are information about Alhadaf Co. Cost incurred Inventory Purchases Sales Adverting expense Salary Expense Depreciation Beginning Inventory Ending Inventory Amount 118,000 350.000 90,000...
-
Figure shows the general nature of the slot-leakage flux produced by current i in a rectangular conductor embedded in a rectangular slot in iron. Assume that the iron reluctance is negligible and...
-
Consider the long-shunt, 250-V, 100-kW dc machine of Example 7.3. Assuming the machine is operated as a motor at a constant supply voltage of 250-V with a constant shunt-field current of 5.0 A, use...
-
Consider the inductor of Problem 1.17. Write a simple design program in the form of a MATLAB script to calculate the number of turns and air-gap length as a function of the desired inductance. The...
-
October 20X1, Little Raven plc issued 50,000 debentures, with a par value of 100 each, to investors at 80 each.The debentures are redeemable at par on 30 September 20X6 and have a coupon rate of 6%,...
-
On 1 October year 1, RPS plc issued one million 1 5% redeemable preference shares. The shares were issued at a discount of 50,000 and are due to be redeemed on 30 September Year 5. Dividends are paid...
-
(a) Who are considered to be the potential users of financial reports? (b) What do you consider to be their information needs? (c) How would you expect a consideration of user needs to influence...
Study smarter with the SolutionInn App