Induction Generator Info needed
Induction Generator Info needed
(OP)
I am in need of information concerning the starter and power controler for a 300kW 480 VAC indcution generator system.
The generator will be driven by a hydro turbine and directly connected to the power grid once at synchro speed. The power control must would output s 4-20ma signal to turbine valve.
Dan
The generator will be driven by a hydro turbine and directly connected to the power grid once at synchro speed. The power control must would output s 4-20ma signal to turbine valve.
Dan






RE: Induction Generator Info needed
RE: Induction Generator Info needed
I had done the usual google search prior to my Eng-Tips inquiry and found the same site.
I am searching for a more technical presentations on the topic.
Dan
RE: Induction Generator Info needed
You just need a speed switch to give a close command to a breaker and then a governor to control it. I have used Woodward 2301D on many induction generators and they give great control. A small PLC integrated with it to do some general housekeeping and you have your system. Induction generators are very forgiving when it comes to synchronizing. A few rpm here or there doesn't matter.
RE: Induction Generator Info needed
I say starter because I assume that one would use an across the line starter contactor (what you are calling the breaker) that would close to connect the generator to the grid once the turbine brings it to synchronous speed.
You answered one of my question with your reference to the Woodward 2301D.
The proposed machine is to be approx 300kW and 480 volts.
I have requested specific turbine and water valve information and have not yet received it.
RE: Induction Generator Info needed
A cheap and flexible solution with lots of potential in it. There is also a lot of spare capacity in this EUR 150 (USD 180) PLC.
RE: Induction Generator Info needed
You may also want to add power factor correction capacitors, which need to have delay switching upon synchronzing to avoid counter torqures on your turbine.
RE: Induction Generator Info needed
Gas clothes dryers theoretically use the same motor and contact to control the gas burner.
This may sound really primitive but it is cheap.
An alternate method is that Telemecanique makes some inductive proximity switches that sense the speed of a toothed wheel or a simple bolt that passes through a shaft or a fan blade. You can adjust these to change the contact threshold at a certain speed. You would need at least 2 of these, 1 to control the contactor and the other to close the water valve in the event of overspeed.
More expensive but more precise.
Mike Cole mc5w at earthlink dot net