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OLS and UFR Simulation in PSS/E

asked 2020-10-14 22:36:59 -0500

F7R gravatar image

I would ask about Over Load Shedding (OLS) and Under Frequency Load Shedding (UFLS) Simulation in PSS/E :

  1. Based on the guide in PAGV2, simulation OLS using Over Current Relay (OCR) could only switched off the line in TIOCR model library. How to configure switched off the load?
  2. Simulation UFLS using Under Frequency Relay (UFR) could only switched off the load, generator and shunt in LDS3xx model library. How to configure switched off the line for islanding study purposes?
  3. How to create more than 3 step under frequency load shedding in LDSHxx?
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answered 2020-10-15 08:33:06 -0500

perolofl gravatar image

1: Model TIOCR1 can shed a load at a bus. It is specified in ICON(M+1) and ICON(M+2).

2: You have to write a user model.

3: Split the load into two loads with specific id, e.g. 'LA' and 'LB'. Call LDSHxx two times, one for loads with id 'LA' for step 1, 2 and 3,and one for loads with id 'LB' for step 4, 5, 6. In that way up to six load shedding steps can be modeled.

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Thank you for your answer perolofl, based on your experiences and your tricks as described as answer no.3. If you have example of user dll model about creating line target of UFLS, could you give or send to my email fajar.ari.k@gmail please?

F7R gravatar imageF7R ( 2020-10-15 23:02:15 -0500 )edit

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Asked: 2020-10-14 22:36:59 -0500

Seen: 50 times

Last updated: Oct 15