$noshutdown = @("DC","vCenter","backup")

$vms = (Get-Cluster -Name $clusterName | Get-VM | where {$_.Powerstate -eq "PoweredOn"})

foreach ($vm in $vms)
{
    if ($noshutdown -contains $vm.Name)
    {
        continue
    }
    else
    {
        $vm | Shutdown-VMGuest -Confirm:$false
    }
}