and so for motor operation it is positive and for generator operation negative.

Figure 7.29 shows how the active power varies with slip for a 1 MW induction machine. A convention has been chosen with the current flowing into the circuit and so the normal operating region for a generator is between O and A. At 1 MW generation (A) the slip is around —0.8 percent with the rotor rotating faster than the stator field. It may be seen that the maximum power that may be generated before the peak of the curve is reached is only some 1.3 MW. This is because the generator jXs jX

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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