I found this on Virtualization Admin, but I think it refers to an older version of the library as some commands were different.

Management Library for Hyper-V

Make sure to download the PDF documentation, it shows you how to load the module and which Cmdlets are available.

Run install.cmd, that will install the files etc.Then run "import-module C:\Program Files\modules\Hyper-V.psd1"

You can type Get-VMState to list VMs and whether they are running

Start-VM "VM Name" to start it.