Electrolytic capacitor

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Joined Nov 20, 2007

I'm building a circuit which uses an inverter. The voltage output is connected to an inductor. My problem lies with current flow through the electrolytic capacitor. To ease understanding, I've attached a pdf file which is a study similar to the project I'm doing.

The word doc focusses on my problem. My circuit is similar to Figure 1(a). As it can be seen in Figure 2, in the first circuit diagram when current is positive and gradient positive, i.e., switch S4 is conducting, current seems to flow from -ve side of electroltic capacitor to +ve side. If electrolytic capacitor is polarised, how is it possible? Can someone help; am I missing something?

Thanks a lot