there is a dc grid (metro line) which we are trying to regulate its voltage by means of energy storage systems specially suppercapacitors. because of long period of simulation using the real converter with IGBT and switching issues is not an option so we are forced to use the average model. there are some papers which represents buck and boost converter average model separately. i was wondering if we could use these model for our bidirectional converter or we should rewrite an integrated model.
If your grid is DC then you just connect a capacitor to it and that will regulate it over the short term. I don't see any alternative to switching regulators over a long term. Capacitor or battery storage is insufficient for say days or weeks of storage of that sort of energy. Or are you talking about regulation periods of seconds or minutes? I don't follow why you are considering capacitors over the 'long term'. As I wondered earlier, how long is 'long' in that context?
there is not just the voltage regulation. actually my case is about the train which is using regenerative braking an energy storage system (ESS) is needed to store the energy in braking phase and fed the energy back to the grid in acceleration phase of the train. in this way there should be a converter between supercapacitors and dc grid so that it could manage power flow and power direction. As the simulation time is so long (200s) we cannot use IGBTs or real switches so average model is needed to control the converter.
For the "train case" one might use LA (Lead Acid) batteries[1,2] and LA modeling[1-4].
1. http://123.49.46.157/bitstream/handle/10361/3229/09221053.pdf?sequence=1
2. http://www.sciencedirect.com/science/article/pii/S0378775397024981
3. https://www.mathworks.com/help/physmod/simscape/examples/lead-acid-battery.html?s_tid=gn_loc_drop.
4. https://www.mathworks.com/tagteam/40542_SAE-2007-01-0778-Battery-Modeling-Process.pdfhttps://www.mathworks.com/tagteam/40542_SAE-2007-01-0778-Battery-Modeling-Process.pdf
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