MATT: For small Single phase AC hydros, up to maybe 5 KW one may use a single ballast phase controller with SCR or Triacs.
For intermediate Single Phase AC Hydros one can use an ELC with 2 or 3 Ballast loads steps. For small high voltage DC hydros a very simple controller can be made using a MosFET or IGBT to control up to 20 - 30 amps DC. For AC that is rectified for battery charging, then the controller could be the one used for DC. For higher power like you want a multi step ELC controller is desired. For Single phase, the ELC ( I prefer ELC name instead of the IGC name) could have several ballasts, either binary or equal steps, let's say 15 steps binary ( 4 loads= 1,2,4,8 Resistive Value) ) or linear ( 1/8 of the total power). Power up to 50 KW could be done this way. For 3 Phases, the ELC will need to have 3 equal ELC ( one per Phase) to load each phase independently and ballast to load 50 or more KW with a common ELC controller. Though, for powers greater than 10 KW, I prefer to have a power management that includes ELC, plus water control for easy system operation., specially with systems that may have water level limitations. There are several companies offering such equipment that for many maybe too expensive. Please connect with me directly to discuss your needs. Regards Nando ----- Original Message ----- From: "Matt Fombong" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, October 15, 2005 4:02 AM Subject: Re: [microhydro] Locating an IGC controller > Dear Nando, > > I am very interested in any other more modern designs of IGCs > Nigel does not give details of his system until you go taining with him > such that on reading his book one is left with the basic concepts only. > Moreover his IGC units are for small powers of below 25 KW. In your > response to Martin, you said he should write to you directly. So I am > trying to be like him. > > Suppose one is trying to regulate 25 KW and above, are any systems > presently available ? Let me say that our system requires a 25 Kw IGC > > We in Africa and most of you in Europe use Voltages (220 to 240 V single > phase, 380 to 440 V 3-phase) and a Frequency of 50 Hz. > > We in Cameroon use the 220V/380V, 50Hz system. > > Thanks and regards > > > > > > > > > FOMBONG Matty FRU, Executive Director, > Rural World Resources International > NWCA, Commercial Avenue > P O Box 522, Mankon, > Bamenda > North West Province, > CAMEROON > Tel: 00237 5153746 > > > > --------------------------------- > Yahoo! Music Unlimited - Access over 1 million songs. Try it free. > > [Non-text portions of this message have been removed] > > > > > > > Does your company feature in the microhydro business directory at > http://microhydropower.net/directory ? If not, please register free of > charge and be exposed to the microhydro community world wide! > > NOTE: The advertisements in this email are added by Yahoogroups who > provides us with free email group services. The microhydro-group does not > endorse products or support the advertisements in any way. > > More information on micro hydropower at http://microhydropower.net > > To unsubscribe: send empty message to > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
