The 2.8 kW wind turbine at CIT has a direct drive powertrain and uses an 8 pole three phaseelectrical generator. The turbine blades rotate at speeds of 150 to 300 rpm. Calculate the rangeof electrical supply output frequencies from this generator and describe the primary purpose ofthe rectifier and inverter specified in this wind turbine’s drivetrain.
Question
The 2.8 kW wind turbine at CIT has a direct drive powertrain and uses an 8 pole three phaseelectrical generator. The turbine blades rotate at speeds of 150 to 300 rpm. Calculate the rangeof electrical supply output frequencies from this generator and describe the primary purpose ofthe rectifier and inverter specified in this wind turbine’s drivetrain.
Solution
Step 1: Calculate the Frequency
The frequency of the electrical output can be calculated using the formula:
Frequency (f) = Number of rotations per minute (N) * Number of poles (P) / 120
Given that the turbine rotates at speeds between 150 to 300 rpm and the generator has 8 poles, we can calculate the frequency range as follows:
Lower limit: f = 150 * 8 / 120 = 10 Hz Upper limit: f = 300 * 8 / 120 = 20 Hz
So, the range of electrical supply output frequencies from this generator is 10 Hz to 20 Hz.
Step 2: Purpose of the Rectifier and Inverter
The primary purpose of the rectifier in a wind turbine's drivetrain is to convert the alternating current (AC) produced by the generator into direct current (DC). This is necessary because the electrical grid and most appliances use DC.
The inverter's role is to convert this DC back into AC. This is because while the electrical grid and appliances use DC, they require the current to be in a specific frequency (usually 50 or 60 Hz depending on the country) and voltage. The inverter ensures that the electricity produced by the wind turbine matches the grid specifications.
Similar Questions
The instrument used to turn wind energy into electrical energy is aa.turbineb.Yaw motorc.bladed.generator
Describe how wind turbines produce electricity by referring to energy transfers and transformations
A power-generating windmill is being designed and will consist of a tower with three large blades that rotate on a central hub at the top of the tower. The height of the tower from the ground to the center of the hub where the 3 blades meet is 262 feet, and the length of the blades from the center of the hub to the tip of each blade is 148 feet. The tower is in the shape of a right circular cylinder that has a diameter of 40 feet, as shown in the figure.QuestionAs the blades rotate they span an area and displace the air in that area. In 13 of a full rotation of one of the blades, which of the following is closest to the area, in square feet, that the blade spans?
A power-generating windmill is being designed and will consist of a tower with three large blades that rotate on a central hub at the top of the tower. The height of the tower from the ground to the center of the hub where the 3 blades meet is 262 feet, and the length of the blades from the center of the hub to the tip of each blade is 148 feet. The tower is in the shape of a right circular cylinder that has a diameter of 40 feet, as shown in the figure.QuestionThe windmill’s tower extends from the ground to the center of the hub. Which of the following is closest to the volume of the windmill’s tower?
A 3-phase, 1.5 kW, 415 V, 2-pole, 50 Hz, 2910 rpm induction motor delivers rated output power to a load. If the rotational loss is 150 W, determine the air-gap power.
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.