I would have to agree with BNDas. Are you in a situation that a packaged AVR unit is not available to you? While the concept is straight forward the implementation is not.
You must know that AC generators can / will produce lethal voltages. If you get your hands in the wrong place, they can kill you.
That said, there is much information to be had in this area published on the internet. Lindsay Publications has a book available "Alternator Secrets" that will get you started.
You will need a healthy respect for electricity, a good set of tools and a selection of parts. The part values will need to be adjusted to produce the desired output voltage. I hope you have a sound background in the electrical field, that you can solder and that you will work safely.
I can't give you a circuit as I have no idea as to what type of generator you have and the final circuit would depend on that. The generators I work with use a pulse width modulation method to control the rotor field and this can be done with common, off the shelf parts. Common in my country but as you posted to CR4 as "guest", I can't really tell where you are in the world. Your name would suggest you are in Europe?
Lots of information on the internet and you will certainly increase your knowledge in the process of the design and implementation of your AVR.
Thanks, I'm taking care of a 120Mw gas turbine power plant both electrical and in automation side. I have a back ground in E&I for more than 15 years and I have been doing designing and fabrication of various electronic projects from simulation to pcb fabrication as my hobby for more than 23 years. So trust me, I am very good in Woodward governors, and many other controllers and many more not easy to mention all. I am coming from Tanzania, East Africa.
In short any avr circuit will be usefully to me, I will be very happy even if I can a have a look to that one you have, the one that is using pulse width modulation, What type of pwm chip that you're using? Is your avr having pots for under frequency, stability, and voltage? are you using thyristor or mosfets to control the excitation voltage? You can give to me the circuit that can be used both in single and three phase generator configuration.
Sir, if your not sure with it then try to purschase on other wise test it safely before puting to work, if you made one for your self also its a good idear to modifie the one you have currently.
If your generator is stand alone, it is relatively easy. Simply rectify the output and filter a little. Use this to feed an error amplifier with a RC network in the feedback. Use the amplifier output to drive a transistor that controls the field current. Make sure that you use a freewheeling diode. If you use a large gain, the amplifier will oscillate to generate a quasi PWM and reduce the losses in the drive transistors. The value of the components depends on the size of the generator. If you want to be fancy, some chips have most of these functions built in.
If you intend to connect your generator to another AC source, then the problem is much more complex as you have to regulate both the power (KW) and the KVAR. This is not for people who have to ask for a circuit over the net. If it is your case, buy a unit from a reputable MFG. This will cost many thousands of dollars but it will work (if you set it properly which is not easy). If you want to make your own, be prepared to earn the equivalent of an electrical engineering degree the hard way. Or hire an EE for a few months.
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Experienced is earned, common sense is taught, both are rare essentials of life.
You seems to be very good in generators, I'm good too in control and automation for gas turbines and big rotating machines. I hobbyist in electronics, that is way I was asking for anybody who is having circuits and theory that can enable me for DIY. please I hope that you can assist me for this!
We are manufacturers of AVRs in India and are a leading players in this field. But to achieve this we (a team of EEs) have given 11 Years of dedicated hard work and still we keep on doing lots more to upgrade these products as per new standards.
Anybody with sound acedemics can do this but it will require too much hard work which is no child's play.
I am very good in both electrical and Electronics, I have been doing pcb projects for more than 23 yrs, and up to now working with gas turbines generators, a 120MW power plant, I am very good in various automation systems and Woodward governor.
Automatic Voltage Regulator
Re: avr
