Hi,
Based on my knowledge, you can start a workflow using PowerShell:
$siteURL="http://servername:5555/"
$listName="Test"
$site=Get-Spsite $siteURL
$web=$site.RootWeb
$list=$web.Lists[$listName]
$item=$list.Items[0]
$manager=$site.WorkFlowManager
$association=$list.WorkFlowAssociations[0]
$data=$association.AssociationData
$wf=$manager.StartWorkFlow($item,$association,$data,$true)
For more information about starting workflow in PowerShell, check out the following articles:
http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.workflow.spworkflowmanager.startworkflow.aspx
http://www.moss2007.be/blogs/vandest/archive/2008/01/18/programmatically-start-workflow.aspx
http://www.c-sharpcorner.com/UploadFile/anavijai/how-to-start-the-workflow-for-an-item-using-powershell-in-sharepoint-2010/
Thanks,
Rock Wang
Rock Wang TechNet Community Support
