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Experiment 1 (II Cycle): Synchronization of a given alternator with infinite bus and seeing
power exchange with the grid
A...
2. Study of the effect of speed controller of prime mover on real power sharing
3. Study of effect of excitation on reacti...
- If the alternator excitation current is increased from zero-power excitation current
(Iz), more reactive power is transf...
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EEP303 Cycle ii exp-1

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EEP 303 lab report

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EEP303 Cycle ii exp-1

  1. 1. Experiment 1 (II Cycle): Synchronization of a given alternator with infinite bus and seeing power exchange with the grid Aim: - Synchronization of a given alternator with infinite bus - Study of the effect of speed controller of prime mover on real power sharing - Study of the effect of excitation on reactive power sharing Basic theory:  For complete synchronization of two 3-phase systems the following conditions should be met: 1. Frequency of both the systems should be same 2. Voltages must be equal 3. Phase sequences of both systems should be same  Changing its excitation cannot change the real power output of a synchronous generator operating in parallel in a system of constant frequency and constant voltage. As the generator speed remains same, change in excitation would change the power factor at which the synchronous generator operates without changing the power output.  The output of a synchronous generator with fixed V terminal, fixed excitation and fixed frequency may be changed by changing its governor setting (speed load characteristic) Equipment and components: - Two synchronous machines coupled to D.C. shunt motors (prime movers) - DC and AC ammeters and voltmeters - Watt meters - Synchronized panel with lamps - Tachometer - Loading and field rheostats Circuit diagram: 1. Synchronization of the alternator with grid:
  2. 2. 2. Study of the effect of speed controller of prime mover on real power sharing 3. Study of effect of excitation on reactive power sharing: Observations: 1. Active power flow exchange with grid: Vterminal = 385 V Motor armature current Alternator armature current Power (W) 14.4 2.7 1240 12.6 2.5 1080 11.2 2.3 1000 9.8 2.1 880 2. Reactive power exchange with grid: Excitation current at zero power = 0.3 A (Alternator field current) Alternator excitation current Alternator armature current Power Over-excitation 0.76 3.95 13603 0.70 3.55 12003 0.62 2.9 9603 0.40 1.15 3603 Under excitation 0.0 2.4 8003 0.06 1.85 6003 0.10 1.45 4403 0.16 1.00 2403 Conclusion: - As the speed of primer mover is controlled, i.e. motor field current is changed the real power sharing of the alternator with grid is affected. More the speed, more the real power transfer from alternator to the grid
  3. 3. - If the alternator excitation current is increased from zero-power excitation current (Iz), more reactive power is transferred to the grid (over-excited state). If it is decreased from Iz more and more reactive power is taken from grid and the alternator is said to be in under-excited state

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