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Anonymous Poster

Hydro Electric Synchronous Generator

10/02/2009 5:05 AM

Sir,

Please give a detailed description regarding my below doubts:-

1. How the load of synchronous generator can be varied even though the generator runs in synchronous speed.

2. How the output voltage & frequency can be varied?

3. The Synchronous generator is running in synchronous speed even though the % of opening of water nozzle for the runner is varying and thus the water output from penstock is varying?

4. If negative / positive MVAR introduced to the system, what will happend?. Is this effect the generation?. Is it affect voltage?. Please expain with vector diagram?.

Rgds

BIJU
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Hendrik
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#1

Re: Hydro Electric Synchronous generator

10/02/2009 7:30 AM

The impulse turbine is fitted with a Governor (sensitive to RPM)

When more power is drawn the wheel will slow down causing the nozzle to open to deliver more water & power.

When too much water is released the speed will pick up causing the Governor to close the nozzle slightly.

The Governor therefore always attempt to keep the volume * pressure in balance with the Volts * Amps at a constant frequency.

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byjuram
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Join Date: Mar 2009
Posts: 57
#3
In reply to #1

Hydro Electric Synchronous generator

10/04/2009 10:08 AM

Good reply

How the excitation current varies ?. Is there any equations?

How the MVAR introduced in the system affects the voltage ?.
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parameshmalakar
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Join Date: Sep 2009
Posts: 4
Good Answers: 1
#2

Re: Hydro Electric Synchronous Generator

10/03/2009 11:23 AM

Regarding the above I say:

1. Vary the power input to the shaft, i.e., increase the opening of the inlet valve. Keep an watch over the PF.[ Conditions apply like water head.]

2. Voltage can be varied with change in excitation. Frequency can be varied with variation in prime mover input [ if the generator is in solo operation.]

3. Most likely the water head is changing.

4. The generator will be stable within the capability limit. The voltage will decrease with lagging and increase with leading MVAR.
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