How PSS/E calculates flow(P&Q) of branch in dynamic simulation?

dat
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When I apply a line fault to my UDM WTG model in dynamic simulation, I find that the QELEC of UDM WTG is good, while the flow (Q) of branch becomes very large in a short period of time after applying fault. I believe this problem is caused by UDM codes, but I have no idea which part of UDM would influence the calculation of flow in dynamic simulation. Perhaps it's because the precision is different when stored in different types of arrays？

answered May 26 '3

perolofl

3452 ●1 ●9 ●20

As I understand it: QELEC is calculated by the UDM, while the branch flow is calculated by PSSE from the bus voltages.

The bus voltages are updated at the network solving performed for each time step in the simulation.

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Yes, QELEC is calculated by my UDM, and it looks good in the channel plot. In addition, I noticed that bus voltages are good as well, which means there are no big spikes when applying fault. However, the value of branch flow (Q) shows significant spikes when the fault is applied and cleared.

dat (May 26 '3)

It is normal for converter models to have (numerical) spikes when applying and clearing faults.

perolofl (May 26 '3)

Yse, the 2nd generic WTG models have spikes when applying faults as well, but the spikes of the UDM models are larger than the generic models. So, I wonder there are ways to decrease these spikes by improving the UDM codes?

dat (May 29 '3)

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How PSS/E calculates flow(P&Q) of branch in dynamic simulation?

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