Q2 (a) Outline with the aid of a suitable diagram the necessary power conversionstages required to interface a small permanent magnet (PM) wind generatorto a 3 phase AC grid.(b) Given the operating conditions for a stand alone star connected 3 phasesynchronous generator outlined in Table Q2b construct a scaled phasordiagram and determine the resultant load current and power factor. On thesame phasor diagram indicate the resultant changes when the load currentincreases by approximately 20% for no change in (lagging) power factor orexcitation voltage.ValueParameterV.415VExcitation VoltageLoad Angle300V20°Xs1.50Table Q2bA star connected 3 phase wound field synchronous generator with asynchronous reactance of 120 is connected to a 11kV (line) grid andsupplies 1MW at 0.92 lagging power factor at its terminals. Calculate thephase current and resultant voltage across the synchronous reactance (Vxs),and from a scaled phasor diagram graphically determine the requiredexcitation voltage (Eph) and load angle (8).(c)(d) The load is now increased to 3MW with the Excitation Voltage keptconstant. Using the phasor diagram drawn in part (c) graphically determinethe resultant phase current, power factor and load angle.

There is Star connected three phase system.

Q2 (a) Outline with the aid of a suitable diagram the necessary power conversion stages required to interface a small permanent magnet (PM) wind generator to a 3 phase AC grid. (b) Given the operating conditions for a stand alone star connected 3 phase synchronous generator outlined in Table Q2b construct a scaled phasor diagram and determine the resultant load current and power factor. On the same phasor diagram indicate the resultant changes when the load current increases by approximately 20% for no change in (lagging) power factor or excitation voltage. Value 415V Parameter Excitation Voltage Load Angle Xs 300V 20° 1.50 Table Q2b A star connected 3 phase wound field synchronous generator with a (c) synchronous reactance of 122 is connected to a 11kV (line) grid and supplies 1MW at 0.92 lagging power factor at its terminals. Calculate the phase current and resultant voltage across the synchronous reactance (Vxs), and from a scaled phasor diagram graphically determine the required excitation voltage (Eph) and load angle (8).

Q2 (a) Outline with the aid of a suitable diagram the necessary power conversion stages required to interface a small permanent magnet (PM) wind generator to a 3 phase AC grid. (b) Given the operating conditions for a stand alone star connected 3 phase synchronous generator outlined in Table Q2b construct a scaled phasor diagram and determine the resultant load current and power factor. On the same phasor diagram indicate the resultant changes when the load current increases by approximately 20% for no change in (lagging) power factor or excitation voltage. Value 415V Parameter Excitation Voltage Load Angle Xs 300V 20° 1.50 Table Q2b A star connected 3 phase wound field synchronous generator with a (c) synchronous reactance of 122 is connected to a 11kV (line) grid and supplies 1MW at 0.92 lagging power factor at its terminals. Calculate the phase current and resultant voltage across the synchronous reactance (Vxs), and from a scaled phasor diagram graphically determine the required excitation voltage (Eph) and load angle (8).

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.38P: Consider a three-phase generator rated 300MVA,23kV, supplying a system load of 240 MA and 0.9 power...

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