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.