Active and Reactive Power Concept in Simulink Design
in [Matlab]
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From: RAGAVENDAR on 9 Aug 2010 03:57 Hello Friends I designed the wind farm using squirrel cage induction generator. While taking power output at the Point of Connection it is behaving in a strange way.According to the Concept, as Active Power increases my reactive power should be increased. But here as Active Power increases my reactive power decreases. Why is this anamoly happening? Looking forward for suggestions. Thanks in advance.
From: Frank W. on 12 Aug 2010 04:41 > I designed the wind farm using squirrel cage induction generator. While taking power >output at the Point of Connection it is behaving in a strange way.According to the >Concept, as Active Power increases my reactive power should be increased. But here >as Active Power increases my reactive power decreases. According to which concept? Active and reactive power of an AC motor are not independent from each other. > Why is this anamoly happening? Looking forward for suggestions. Thanks in advance. Try searching for 'osanna circle'. This diagrams represents the motor current phasor(s) for different rotor speeds (thus load/active power). Or try to find a single line representation consisting of motor stator resistance and stray inductance, mutual inductance and rotor stray inductance and rotor resistance. The term for the latter should be something like Rr'/s with s being the so called slip. Now calculated the motor current phasor for a constant motor voltage for s=0 (approximates no load) and some slip like s=0.08. Then think what the different current phasors (i.e. pahse relation between voltage pahsor and current phasor) mean for active and reactive power.
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