when I use this command:

Install-SPSolution -Identity ADUserManagement.wsp  -GACDeployment -CompatibilityLevel  {14,15} -Force:$true

got this error:

Install-SPSolution : A parameter cannot be found that matches parameter name 'CompatibilityLevel'.
At C:\Users\xt\Documents\AddSoltuon.ps1:16 char:68
+     Install-SPSolution -Identity ADUserManagement.wsp  -GACDeployment -Compatibilit ...
+                                                                       ~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Install-SPSolution], ParameterBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.SharePoint.PowerShell.SPCmdletInstallSolution
 

Is this working if you provide only 15 as CompatibilityLevel?

Install-SPSolution -Identity ADUserManagement.wsp  -GACDeployment -CompatibilityLevel 15 -Force:$true

got same error.

yes, same error.

Check you powershell version, try running this command in V3 if it is running in V2

http://technet.microsoft.com/en-us/library/ee806878.aspx

http://stackoverflow.com/questions/13017734/how-to-load-powershell-ise-3-with-powershell-v2-inside