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Wind_Energy_Essentials_Lecture 4

25 miles hr copyright source n mohan 2010 9 power from

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Unformatted text preview: ht Source: N. Mohan 2010 9 Power from the Wind © Copyright N. Mohan 2010 Source: 10 Electrical System Model: Source: © Copyright N. Mohan 2010 11 El Electric Power Basics Basics Power Systems Electric Generators Generators Power Electronics Research (2 slides) (2 slides) Curricular Reform (2 slides) © Copyright N. Mohan 2010 12 Power System Basics Power System Basics 161 kV V 0 Time Low-Voltage Ride-Through 0 690V 10 60 Hz Generator 690V 34.5 kV 60 Hz 13 Power Electronics Electronics Converters © Copyright N. Mohan 2010 Reason for using AC: Ability to Transformer Voltage Levels © Copyright N. Mohan 2010 14 Phase Relationship between Voltage and Current: p (t ) 2V 2I average power / v(t ) p (t ) average power 0 v(t ) t 0 t (a ) Average P V I i (t ) ( b) Average P V I cos cos i (t ) © Copyright N. Mohan 2010 15 Phasors Imaginary v (t ) 2 V cos t positive angles i (t ) 2 I cos(t ) V V 0 Real i( t ) I I I j L j X L v( t ) 2V cos( t ) L V V 0 Z R jX L jX c R 1 j j XC C (b) R C (a ) V V I Z Z Ri (t ) L di (t ) 1 i (t ) • dt 2 V cos(t ) dt C © Copyright N. Mohan 2010 16 P and Q I Subcircuit 1 V Subcircuit 2 S P jQ Im (a) IP V V v Im S QQ j IQ Re P (c) Re I I i (b) P...
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