Dear Mr. Zimmermann, dear all,
I have another few questions concerning the limits of reactive power generation within the CPF. I created a code by myself which should implement the limits:
1. After every corrector-step the code checks if any reactive power limits of the generators were exceeded.
2. If "no" – go on, if "yes" then the following steps are done:
3. Identify the generators, which exceed their reactive power limit and set the corresponding value (Q_g) to the limit of the generator. Afterwards, the corresponding bus is converted to a pq-bus.
4. Update Sbusb with the new busb and genb, update Sbust with the new bust and gent. Update Sxfr (which should still be the same). Update bus_types-list.
5. If the ref-bus was exceeded then chose a new ref-bus and adjust the voltage-angle. The angle for the ref-bus is “0” and the length is “1”. The other buses are shifted accordingly.
6. Go back to the previous corrector-step and start the step with new stats.
So when the new the next step predictor and corrector step starts the following values have changed: Sbusb, V0, Vprv, ref, pv and pq.
So in my opinion it should be able to determine the next corrector-step with the new information.
Unluckily it doesn't work because the corrector-step does not convert, I tested the additions with case9.m. Remarkable is the change in lambda, during the normal cpf-procedure it gets continuously larger, but if a reactive power limit is exceeded and my code is applied, lambda gets negative – I do not know why.
I attached the code if you need to have a closer look. The qlimit-code is applied between 277 and 431.
Thank you very much for your help
Kind regards,
Thomas
runcpf_with_qlim.m
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