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CYME User Defined Model for a Frequency Converter

CYME User Defined Model for a Frequency Converter

CYME User Defined Model for a Frequency Converter

(OP)
Hello,

Our company has recently started using CYME PSAF (version 2.64) for our power analysis.  As a large Pulp and Paper Mill we have a decent sized electrical grid.  Our power system uses both 60Hz power generated on site and imported as well as an older 50 Hz system generating power onsite.  We have a 20MVA Frequency Converter (FC) to exchange power between the grids.

What I am having a problem with is a stability model for the FC is not available for PSAF, and would have to be created.  It is a dual generator FC that starts on the 50Hz side.

We have tossed around a number of ideas for this model, but have not yet been able to decide on the final model that we will use.  Our current top choice is a dual static load model that reads generation/load values on both sides, factors in frequency (higher current draw / more heat dissipation at frequencies lower then rated values) and then distributes the surplus power accordingly.

The pros are implementation of the model and an accurate transfer of power between 50/60 cycle systems.  The main cons we have with this option is there are limited functions for acquiring the power generation values during the simulation and the fact that the behaviors of a synchronous machine are neglected by modeling as static loads.  

Has anyone worked with CYME software on a similar project?  I am curious to hear any ideas that have been implemented for modeling FC's in this, or other, software packages.

Any help would be appreciated, Thanks!

RE: CYME User Defined Model for a Frequency Converter

Suggestion: Contact the frequency manufacturer for FC modeling. Please, clarify whether the FC is static or rotating.

RE: CYME User Defined Model for a Frequency Converter

(OP)
Hello,

The frequency converter is a rotating machine comprised of two synchronous generators.  The 50Hz side is rated at 20MVA and the 60 Hz side is 21MVA.  The 50 Hz side is also motor assisted for starting.

The frequency converter has been a part of our electrical system since the mid 1950's.  It was originally manufactured by English Electric, but we upgradred the generators to output more power in 1996.  I have been unable to find any resources online about English Electric. Also I have been able to find any documentation in our engineering library; unfortunately all the information I have on it is the nameplate data from the generators.

If you need any more information let me know.

Cheers.

RE: CYME User Defined Model for a Frequency Converter

You could try Alstom Power Conversion, Rugby, England.
They purchased English Electric some years ago, but still operate in this business.

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