To set the working directory for powershell add the following command to your PowerShell profile:

Set-Location c:\scripts

To Create a PowerShell Profile

1. Create a folder in your Documents folder called WindowsPowerShell in my case that is C:\Users\pera.virtualOne\Documents\WindowsPowerShell

2. Create a file called profile.ps1 inside this folder

3. Add any desired initialization commands to this file (Set-Location c:\scripts) and save it

4. Every time you launch PowerShell, the profile script will be executed

Copy / pasted from here.