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Power Electronics : Assignment

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Added on  2020-05-16

Power Electronics : Assignment

   Added on 2020-05-16

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Power Electronic Applications for Energy SystemsSOLUTIONS1.Cage Induction generator PART A: Operation of cage induction generator scheme: The wind turbine consists of a stalled-controlled rotor with three blades, a gearbox, and a pole-switched asynchronous generator with squirrel cage rotor and a direct mains grid coupling. Normally, the inrush currents are produced when the generator is coupled with the grid soft-starters installed between the generator and grid during the starting period. Now, the blades are exposed to the wind to draw in mechanical power. This power is thentransformed into electrical via the 3-phase ac induction generator whose mode of operation is as follows: The AC supply is attached to the stator terminals such that the power excites the stator while the rotor is connected to the prime mover (which could be a diesel engine). While in rotation, it induces the rotating magnetic field which then cuts with the flux of the stator to induce a voltage. Normally the generator would take in reactive power as it is not self-excited while the active power is fed back to the line as shown in figure 1. The transformer steps up the line voltage beforehand. Figure 1: The wind turbine squirrel cage induction generator scheme (Image courtesy of mdpi.com)
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