ERIC: Too much equipment , just the Induction motor is what you need THAT IS ALL. If you have GRID 3 phase use a 3 Phase motor, that is best.
Of course you can use the 3 phase as a single phase GRID Tied. AND if you want to have isolated power in case the GRID drops, then set a circuit to convert the induction motor as a generator with capacitors and add an ELC to regulate the output voltage for local available power ( this can be done in about 4-8 voltage cycles). Since you have a variable water level you could make the system automatic by using an electronic pressure gauge to maintain the dynamic pressure equal and stable by controlling the Nozzle size -- power to the grid will be ALWAYS MPPT. This set has been done many times Regards Nando ----- Original Message ----- From: "ericfusa" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, May 02, 2005 5:45 PM Subject: [microhydro] Grid-Tie Inverter with Induction Motor as Generator > Hello, > > I am new to the group. > I have a potential microhydro site of about: > -100 ft head > -100 gpm(Winter) to 30gpm(Summer). > -I plan to use 3" or 4" pvc piping with about a 375 to 400 foot run > of the river. > -Pelton or Turgo Impact Turbine > > I had the idea to use a 3ph/4 pole 220VAC Induction Motor as a > Generator and connect the rectified/smoothed output directly to a > Grid Tie Inverter. I noticed that SMA makes a version of their > popular Sunny Boy Inverters for Wind Generation using the same > concept. SMA calls this version a Windy Boy. According to SMA, this > inverter is designed to allow Maximum Power Point Tracking(MPPT) for > an induction motor driven as a generator for Wind Power applications. > > According to my calculations, the induction generator should be able > to output a rectified voltage of about 310V DC or higher which is > perfect fo the inverter. > > Questions: > > Does anyone have any experience with this type of grid-tie/net- > metering system? It seems quite simple and efficient to me but, I am > a micro-hydro newbie and may be making major estimation errors. > > I've been told that a PM Generator is more efficient than a driven > 3ph induction motor but, I feel that the overall efficiency of the > system should still be quite good and simple. > > Any comments or critisism would be greatly appreciated and will > surely save me time, frustration, and money. > > Kind Regards, > Eric Kunz > Camas, WA USA > > > > > > > > > > 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 --------------------~--> What would our lives be like without music, dance, and theater? Donate or volunteer in the arts today at Network for Good! http://us.click.yahoo.com/TzSHvD/SOnJAA/79vVAA/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/
