Small signal stability in a rural microhydro powered micro grid?

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Sanjoy Roy

Hi Samundra,

(The answers are in the same order as the Q's.)

Unless you do something unrealistic in your simulation (like setting absurd parameter values, etc.) there should be no local or inter-area modes, for the simple reason that (a) The overall inertia of the generation system will be too small to provide a significant value of H relative to the rest of the system, and (b) For correct set of system parameters, the tie between the generating bus to the system should always be a strong one (say, not more than 0.2pu reactance on the system base).

Yes, a convenient way to "ape" a load controller will be to judiciously use the governor module or block. But be careful with the parameters once again - realistic parameter values for the LC are totally different from those of the governor !

Are you using PSCAD/EMTDC, by any chance ? If so, the system will be particularly easy to simulate !

With best wishes.

-Sanjay

Srete Nikolovski

I can advice you to use DIgSILENT software and you can easy check it by easy modeling your system, using Stability-modal analysis module .

Samundra Gurung

Thank you for such clear explanations. I will be using PSAT which runs in the Matlab environment.

Jeremy Lin

I am curious;

what is the size (peak load) of that rural microgrid?

and what is the size (MW capacity) of each synchronous generator?

I can understand you can have SSR kind of problem with synchronous generator. But, answer my two questions will tell you IF your stated problem makes any sense!!

Regards,

Jeremy

The peak load is only around 80KW and the rating of each generator lies in between 8-16KVA.

that size of synchronous generator seems too small. You can increase your peak load a bit more so that your assumption about the size of synchronous generators seem more reasonable.

After quick search, I can find the smallest synchronous generators can be from 150 KVA to 5000 KVA. But, don't forget, "synchronous" really means the generator(s) are connected to the grid all the time. If they are not connected to the grid, or in your isolated microgrid case, the word synchronous does not mean anything and you may not have SSR kind of problem.

I hope that is clear to you.

I have to do the stability analysis of that grid as it is like a project and a case study for my course. I think I will go with the analysis of transient stability , short term voltage stability and frequency of that grid. Do you guys have any specific suggestions?