# The Reflection Of Mechanical Power

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Mechanical power is defined as torque and RPM (rotation per minute) and electric power is defined as current and voltage. Therefore, in order convert mechanical power into electric power, torque shall be converted into current and rpm shall be changed into voltage. The relation between the rpm and voltage can be defined with equations with the use of Equations. When there is a decrease in value in equations there is an increase in efficiency of power generator. In here, there is no loss when value is 0. Therefore, Equations can be defined accordingly with conservation of energy principle suggesting generating power is same as mechanical power. Then, the relation between torque and current can be induced as Equations.

Since current is
The (MPPT) technique is said to extract the most mechanical power from wind turbines. It only uses 1 wind speed sensor to regulate the speed to it’s normal value. Therefore there is no need for any kind of sensor (tachometer) or the shaft power meter, etc. the instant angular speed of the turbine is extracted from the output voltage of the generator coupled to the turbine. The (MPPT) technique is verified to have 98.04% efficiency that is more than any other technique used not only that the convergence time takes only 18ms, which is the shortest time compared to another techniques. The (MPPT) technique provides the highest MPPT efficiency along with the shortest tracking convergence time when it is compared to the state of the art techniques for extracting maximum mechanical power from turbines. It is very simple, has low cost, and has a very good response to sudden change in wind speed, and these are considered to be …show more content…
The wind turbines are used to change the kinetic energy to electrical energy & mechanical power as we all know that but what happens inside of that mechanism is what is important. Most turbines have from 2 to 3 blades and the wind moving over the blades causes them to rotate, as the blades rotate they spin the shaft which is connected to the electrical generator. Turbines are complicated machines that includes sophisticated gearboxes for increasing the spinning shaft speed from 30 to 60 (rpm) required by most of the generators to produce electricity. The power in the win is directly proportional to the cube of the wind speed, to make that clear, for example a 20 (KPH) wind speed will generate 8 times the power of 10 (KPH). However this doesn’t happen a lot cause of the wind change in speed that occur. The wind speed depends on many factors such as the time of the day, the change in temperature, and the height of pole the more higher you go the more wind speed you will have but with more turbulence at higher altitudes. The modern wind turbines are made from 60 to 100 meters tall. The rotor blades can be more than 120 meters, because of the wind turbine is operating at high altitude and the huge rotor diameter wind speed differs at the ends of the blades which may

• ## Wind Distortions Essay

Many factors affect flicker emission of grid connected wind turbines during continuous operation. Variable-speed wind turbines show better performance related to flicker emission in compared to fixed-speed wind turbines. The flicker study is necessary and important as the wind power penetration level is increasing quickly. Due to the smoothing effect, large wind turbine produce lower flicker than small wind turbines. The flicker level depends on the shape, amplitude & repetition frequency of the fluctuated voltage waveform.…

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• ## The Comparison Of Two Components Of Power Flow Theory

It is denoted by the symbol Q, and its magnitude is given by: Again, note how the equation converges for the resistive case where ø = 0 and sinø = 0, as there will be no reactive power at all. Reactive power is measured in VAR (also written Var or VAr), for volt-ampere reactive. We can represent power as a vector in the complex plane: namely, and arrow of length S (apparent power) that makes an angle ø with the real axis. The angle ø is the same as the phase difference between voltage and current. Therefore the VAR compensation improves the stability of ac system by increasing the maximum active power that can be transmitted.…

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• ## Wind Energy Dynamic

For instance, a coal plant would have very large maintenance cost, whereas a wind turbine has little to no maintenance cycles. Wind turbines mostly have an initial startup fee that would include cost of materials, labor of installing the wind turbine at the desired location, and a monthly fee for use of property. Another reason wind turbines are cost effective is because there is no royalty on wind that passes the blades of a wind turbine. The supply of energy is virtually endless since the temperature differences between the surface of the earth and the atmosphere always cause winds to circulate throughout the entire world. Although there seems to be little worry in terms of the sustainability of a wind turbine and its cost efficiency, as with many energy sources the…

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• ## The Scheatic Analysis Of Direct Flux And Torque Control

Duty cycle is expressed in percent, 100% being fully on. The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications…

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• ## Performance Analysis Of Centrifugal Blower

Pressure Blower total pressure ∆p_t, expressed in Pa, is the total pressure rise of a blower, i.e., the pressure difference between the total pressure at the blower outlet p_to and the total pressure at the blower inlet p_ti, both in Pa: ∆p_t=p_to-p_ti (1.5) As shown in Figure 1.9, ∆p_t-V ̇ curve of a forward blower is flatter than that of the backward blower. Figure 1.9 – PRESSURE-VOLUME FLOW PERFORMANCE CURVES FOR CENTRIFUGAL BLOWER Total…

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• ## Chapter 4: Modelling Of Permanent Magnet Synchronous Generator

Chapter 4 Modelling of Permanent Magnet Synchronous Generator 4.1 Overview The permanent magnet synchronous generator is used in this thesis as wind turbine generator because of their high efficiency, low losses, smaller size, less maintenance, high reliability and the ability to operate without gearbox [33], [34]. The main aspect which distinguishes the Permanent Magnet Synchronous machine from other types of electrical machines is that the rotor magnetic flux is generated by permanent magnets, instead of being supplied by other external power sources as in DC machines and synchronous machines. Therefore, there are no rotor copper losses associated with this type of generator. Another main feature of this type of generator is that it can…

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• ## Tidal Energy Research Paper

First of which is the very high potential energy of the tides. “Water is 832 times denser than air and consequently tidal turbine rotors can be much smaller than wind turbine rotors thus they can be deployed much closer together and still generate equivalent amounts of electricity.” (Askari Mohammad Bagher). Since water is so much denser then air it has a huge advantage over wind turbines which require powerful winds and huge rotors to catch the wind. The compact capabilities make it easier to fit more turbines in one place but the concentrated turbines might make enough noise to disrupt the migration patterns of many species. Tidal energy does not require any start fuel or fuel that has to be bought in general unlike nuclear power plants which need very expensive metals to produce energy.…

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• ## The Pros And Cons Of Alternative Energy And Nuclear Energy

To begin with, nuclear energy has several major advantages. Not only a large amount of energy can be produced with only a tiny amount of energy input to the power generator, but the maintenance cost is low also. Moreover, unlike fossil fuel, it will not cause serious air pollution. However, after the two serious nuclear…

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• ## Fuel Cells

In order to obtain the flow distribution in fuel cells, the following assumptions are applied to establish a flow network model. 1) The reactant ges in consid to be steady flow in impervious channels and the temperature is uniform. 2) A fluid network is comprised of straight pipe, intake, exhaust duct and T-shape connection. 3) The influence of inertia is ultralow in contrast to the viscosity due to the low Reynolds number. Furthermore, in the straight pipe, a fully developed laminar assumption is satisfied under the condition that shape change is negligible.…

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• ## Case Study: Direct Current (DC) Motors

The mode of the electrical connection will also determine the motor operating characteristics. Self-excited and separately excited is where the winding terminals are connected across the input voltage and separate voltage source respectively. 1.5 Efficiency of a DC motor Some power loses takes place as power flows from the input to the output terminals of the motor. Therefore, the motor efficiency can be calculated as the ration of the output power to the input power. Efficiency = power output / power input 1.6 Rating of a DC motor DC Motors are rated in terms of the rated voltage, rated power, rated speed and rated load.…

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