Kateflux

Thank you Roger. I tried setting the generator model = 3 but the power flow does not converge. I tried to set pvfactor = 0.1, solve mode = direct but obtained unfruitful results.

There are no loads because the generators needs to deliver its power to the 115 kV circuit which was modeled as Vsource.

I set the wind turbine generator model = 1 (constant kW, specified pf). When I solved the load flow, the WTG terminal voltage do not fall within the specified Vminpu and Vmaxpu. The output kW and kVAr also deviated from the specified values. Please let me know if I'm missing something on the models. The feeders in the model are 34.5 kV underground cables with significant lengths.

Hi Davis, My apologies. In my previous post I was referring to kVA, not kW. I think the model is working properly contrary to what I initially thought. Thank you. If I adjust the MVAsc of the Vsource from 50 to 5, there are large voltage drops. Because I want to represent the diesel generator as a Vsource having weak short circuit capacity, is there a turn-around (in OpenDSS) to this without having the voltages in the entire model dropping to unacceptable value?

So I came up with the attached microgrid model. Following were my observations: 1. The Vsource is a diesel generator in Power Plant 1 with P = 8 MW, and another generator in Power Plant 2 is modeled with P = 608 kW. For Power Plant 1, MVAsc3 and MVAsc1 were set to 50 and 40, respectively because if i put the actual values associated with the diesel generator, the voltage collapses. The parameters of generator in P/P are as follows: X"=0.18, X'=0.18 Contrary to my comment above, the generators in...

If i understand it correctly, the 4 generators in my case can be converted into current sources in order to excite the microgrid?

I'm about to construct a microgrid system model in OpenDSS for load flow analysis. The distribution system is supplied by 4 diesel generators and transmitted at 13.8 kV distribution voltage. The network is not connected to main grid since its a small island. I remember in OpenDSS, there should be a VSource object to represent the rest of the main network. In a microgrid set-up, I don't think that object can be used. Has anyone have had the same situation like this? I will be studying only power flows...

My idea when performing short-circuit studies is that the saturated subtransient Xdv" reactance should be used. On the other hand, the unsaturated subtransient Xdi" reactance is used when performing dynamic studies. I am aware that OpenDSS is bit different from traditional power flow programs but I would appreciate if someone can give reasons to this modeling requirement. Thanks.