Function to load the needed SCCM dll's that are needed to automate Application and enhanced detection rules with powershell. Call the function at the start of your sccript.

Load-ConfigMgrAssemblies.ps1

Function Load-ConfigMgrAssemblies {
 Param(
    $AdminConsoleDirectory = "C:\Program Files (x86)\Microsoft Configuration Manager\AdminConsole\bin"
 )
     #Add-Type -Path "C:\Program Files (x86)\Microsoft Configuration Manager\AdminConsole\bin\DcmObjectModel.dll"
     $filesToLoad = "Microsoft.ConfigurationManagement.ApplicationManagement.dll","AdminUI.WqlQueryEngine.dll", "AdminUI.DcmObjectWrapper.dll","DcmObjectModel.dll","AdminUI.AppManFoundation.dll","AdminUI.WqlQueryEngine.dll","Microsoft.ConfigurationManagement.ApplicationManagement.Extender.dll","Microsoft.ConfigurationManagement.ManagementProvider.dll","Microsoft.ConfigurationManagement.ApplicationManagement.MsiInstaller.dll"
     Set-Location $AdminConsoleDirectory
     [System.IO.Directory]::SetCurrentDirectory($AdminConsoleDirectory)
      foreach($fileName in $filesToLoad)
      {
         $fullAssemblyName = [System.IO.Path]::Combine($AdminConsoleDirectory, $fileName)
         if([System.IO.File]::Exists($fullAssemblyName ))
         {
             $FileLoaded = [Reflection.Assembly]::LoadFrom($fullAssemblyName )
         }
         else
         {
              Write-Host ([System.String]::Format("File not found {0}",$fileName )) -backgroundcolor "red"
         }
      }
 }