recitatin4 - Electric Energy Processing: Fundamentals and...

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1 Electric Energy Processing: Fundamentals and Applications 18-418: Recitation #4 Dr. Nermeen T. Mahmoud ( nermeentalaat@cmu.edu ) September 16,2009 Synchronous Generator
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2 Synchronous Machines Synchronous Machine Structures Stator The armature winding of a conventional synchronous machine is almost on the stator and is usually a three phase winding. Rotor The field winding is usually on the rotor and excited by dc current, or permanent magnets. The dc power supply required for excitation usually is supplied through a dc generator known as exciter. [1]
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3 Figure 4-1:Schematic illustration of synchronous machines of (a) round or cylindrical rotor and (b) salient rotor structures (a) (b) Synchronous Machines [2]
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4 Synchronous Generator Equivalent Circuit [1] Where: V a the terminal voltage for phase a . I a the stator current for phase a. E a the internal emf for phase a. R a the armature resistance for phase a. X s the synchronous reactance per phase a. Approximation
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Synchronous Generator Tests [2] The DC test : By applying a DC source between terminals (a-b, b-c, c-a ), and measuring the DC voltage and current, the DC stator resistance can be determined. Considering a wye connection, the resistance per phase is half of the measured. dc ac Temp a ca ca ca dc ca bc ab R K K R R R R R R R R 6 I V I V I V ca ca bc bc ab ab K temp : the correction factor for temperature. K
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recitatin4 - Electric Energy Processing: Fundamentals and...

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