Hello Manoj,
You said something about 1 km in between the injection points. I don't what what you really want, to have 2-3 units of all, or to have 5-10 units covering the shore of an interesting, contant slope, mountain river. If you want more than 2-3 units, the system may be unstable, due to uneven load distribution or so. Another thing: if some unit from one end colapses, then the power has to come from the other end, thus bringing a supplemental voltage drop on wires, etc. If you suddenly loose 10% of your energy sources, then the voltage and frequency of the remaining units will enter in the oscillation zone very fast. There are strong reasons that very large units (100-400 MW each) are used to impose the system frequency and stability in national grids. So, I have big problems imagining a stable system of more than 2-3 units, 10-20 kW each. You will easily find synchronisation relays on the market, but then you will need a coordination between those generators, so that unit no. 2 and 3 (in the order of connection to the grid) will not pump or suck reactive energy randomly, thus "killing" it's neighbouring unit. Coordination means on-line coomunications between those control boxes (4-20 mA or so on long cables), which sounds like science fiction in rural area. It's useless to add that all of the above are valid only for synchronous generators, with static excitation systems, and so on. My overall question for you is why would you think of "globalising" small scale island networks ? Is it so obsolete to stay off the grid ? Perhaps flexibility is an issue here, so if something goes wrong (some local flood or so) only 20-40 houses will black out. Perhaps if you would be more specific on what layout you think of, the comments from the group memebrs will become more project oriented. BR, Radu ----- Original Message ----- From: "Redp Tehrathum" <[EMAIL PROTECTED]> To: "Girish" <[EMAIL PROTECTED]>; <[email protected]> Sent: Saturday, September 10, 2005 12:51 AM Subject: Re: [microhydro] synchronization of two or more micro hydro schemes > Dear Girish Ji, > Thank you for your kind information. I'd like to scrutinize the issue > little bit more in detail. The interconnection as you mentioned is for 100 > kW scheme. Furthermore, it is interconnected to the national grid. My > concern is regarding community managed micro hydro schemes of 10-20 kW > range, situated far from national grid. My further inquiries are: > > 1) What about technical and financial aspects of synchronizing two or > more schemes (10-20 kW range) with each other. > > 2) In community managed micro hydro schemes financial obligation > plays most important role. Is there any possibility of reducing additional > cost of equipment (Anti-islanding protection equipment, fault protection > equipment, lighting protection equipment, transformer and equipment for > safety measures etc) primarily required for synchronization system? > > > > I look forward to getting the epitome of such application. > > > > Regards, > > Manoj > > ----- Original Message ----- > From: Girish > To: Redp Tehrathum ; "microhydro%yahoogroups.com"@nilgiri.mos.com.np > Sent: Friday, September 09, 2005 5:24 AM > Subject: Re: [microhydro] synchronization of two or more micro hydro > schemes > > > You might be interested to know that the 100 kW plant in Tehrathum is > synchronised to the grid. > > Girish > > --------- Original Message -------- > From: "Redp Tehrathum" <[EMAIL PROTECTED]> > To: "[email protected]" <[email protected]> > Subject: [microhydro] synchronization of two or more micro hydro > schemes > Date: 08/09/05 17:34 > > > Glacier > Dear All, > > In Nepal, we can get many appropriate sites to develop micro hydro > schemes (10-20 kW range) along the same river within small distance apart > each other (Say within 1 km range). It is imperative that we synchronize > such micro hydro schemes with each other for optimal power utilization. > But, In context of Nepal, we have to consider both technical and financial > viability of the system. I'd like to know that whether such system is > possible (both technically and financially) or not in case of micro hydro > schemes. > > Manoj Pokhrel > > Nepal > > > > [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 > > > > > > > > > > > > > > ______________________________________________________ > Message sent using Mercantile Communications Web Mail Service 0.1 > > > > [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. 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