Hello, you can easily copy your SVG logo to /img/ folder in your root. Thats where standard location for logo is. Then in DB you can replace value of the logo from logo.png to logo.svg and its done.
Change column "VALUE" in table "ps_configuration" from "logo.png" to "logo.svg".
SELECT * FROM `ps_configuration` WHERE (`name` LIKE '%logo.png%' OR `value` LIKE '%logo.png%')
This select should find it for you.
This works for me on ps 1.7.x.x, havent tried it on different version yet.