Question: Support pq generator in gen table?

[wangzhenassd]

In a transmission grid, synchronous generators could sometimes be controlled with Q value instead of U value. These generators need to be modelled in pandapower as sgen for powerflow analysis. However, for shortcircuit calculation, these generators need to be handled as synchronous generator and thus needs to be modeled as gen. This behaviour caused inconsistency in pandapower network for pf and sc analysis. There are two possible way to properly solve the inconsistency:

• Support pq generator in gen table (similar to "slack" and add extra column "q_mvar")
• Support generator sc parameter in sgen table

The advantage of the first would be more elegant for the user, but the pd2ppc functionality needs to be double checked as well as e.g. the behaviour of such generator in OPF. The advantage of the second would be more simple to implement and only the pd2ppc process for sc calculation needs to be updated, but the sgen table would be more complicated and might also cause misunderstanding.

Additional discussions on the topic are very welcome! @rbolgaryn @lthurner

[SteffenMeinecke]

Currently there is no mechanism to allow gen elements to be considered as pq elements. One solution that works today is to switch back and forth with replace_gen_by_sgen() and replace_sgen_by_gen(). With a future pandapower 3.x we can think about general changes of flexibility and consistency of node types (slack, PV, PQ).