It is permitted to operate multiple accounts on Wikipedia. The guidelines are documented in a Wikipedia policy here: WP:SOCK#LEGIT.
If you are not trying to abuse the system, and you are making genuine contribution to the Wikipedia without misleading anyone by use of your multiple accounts then it is all fine! Take care of basic things like not participating in a discussion with multiple accounts to give the impression of multiple editors. Do not try to mislead other editors and no one should have any problem with your multiple accounts!
This post does not encourage socking.