Can a new visa reset the 90/180?

[GGG]

Dear all,

I am an Asian research student in UK. I took part in a European project so that I have to work abroad in Schengen countries. I spent 2 months in schengen using a tourist visa from mid-April to mid of June and my visa was expired in August. I flew back to Uk to apply for a new tourist visa then I got a new 2-year visa from August. After that, I went back again to continue my work in Schengen countries and spent another 2 months there. Then I came back to uk without any issues. And I just knew about 90/180 from my friend. According to the 90/180, I have already spent more than 90days within the last 180 days. So im a little confused that why I did not get a penalty when I passed the border or the new visa can reset the 90/180?
What i have to ask is that next week i have to enter the Schengen country again due to my work. Consequently, could you please suggest me? Should we go there? or could you please answer the above question about resetting the 90/180 regarding the new visa.

Thank you very much in advance