create powershell script with next text:
clear

Function PostWebRequest{
param(
[String]$url,
[String]$data,
[int]$timeout=300000)

    $buffer = [System.Text.Encoding]::UTF8.GetBytes($data)
    [System.Net.HttpWebRequest] $webRequest = [System.Net.WebRequest]::Create($url)
    $webRequest.Timeout = $timeout
    $webRequest.Method = "POST"
    $webRequest.ContentType = "application/x-www-form-urlencoded"
    $webRequest.ContentLength = $buffer.Length;


    $requestStream = $webRequest.GetRequestStream()
    $requestStream.Write($buffer, 0, $buffer.Length)
    $requestStream.Flush()
    $requestStream.Close()


    [System.Net.HttpWebResponse] $webResponse = $webRequest.GetResponse()
    $streamReader = New-Object System.IO.StreamReader($webResponse.GetResponseStream())
    $result = $streamReader.ReadToEnd()
	return $result
}
$url = "http://xxxxxxxxx/index.php/admin/remotecontrol"
function survey-get-session{
param([string]$url)
$data = "<?xml version=""1.0""?>
<methodCall>
   <methodName>get_session_key</methodName>
   <params>
      <username>
         <value>admin</value>
      </username>
	  <password>
	     <value>xxxxxxxxx</value>
	  </password>
   </params>
</methodCall>"
	[xml]$res_xml = [xml](PostWebRequest $url $data)
	$session_key = $res_xml.methodResponse.params.param.value.string."#cdata-section"
	if($session_key -ne $null){
		return $session_key
	}
	else{
		$Host.get_UI().WriteErrorLine("can't get session!")
		return $null
	}
}
function survey-release-session{
param(
[string]$url,
[string]$session
)
$data = "<?xml version=""1.0""?>
<methodCall>
   <methodName>release_session_key</methodName>
   <params>
      <sSessionKey>
         <value>"+$session+"</value>
      </sSessionKey>
   </params>
</methodCall>"
	[xml]$res_xml = [xml](PostWebRequest $url $data)
	$closed = $res_xml.methodResponse.params.param.value.string."#cdata-section"
	if($closed -ne $null){
		return $closed
	}
	else{
		$Host.get_UI().WriteErrorLine("can't close session!")
		return $null
	}
}

function survey-list-surveys{
param(
[string]$url,
[string]$session,
[string]$user=$null
)
	$data = "<?xml version=""1.0""?>
<methodCall>
   <methodName>list_surveys</methodName>
   <params>
      <sSessionKey>
         <value>"+$session+"</value>
      </sSessionKey>
      <sUser>
         <value>"+$user+"</value>
      </sUser>
   </params>
</methodCall>"
	$objs=@()
	$props = @{sid = ""; surveyls_title = ""; startdate = ""; expires = ""; active = ""}
	$obj = New-Object -TypeName PSObject -Property $props
	
	[xml]$res_xml = [xml](PostWebRequest $url $data)
	$list = $res_xml.methodResponse.params.param.value.array.data
	
	foreach($val in $list.value){
		$struct = $val.struct
		$obj_cur = $obj.PSObject.Copy()
		foreach($mem in $struct.member){
			$param_name = $mem.name.FirstChild.value
			$param_value = $mem.value.FirstChild.FirstChild.value
			$obj_cur.($param_name) = $param_value
		}
		$objs+=$obj_cur
	}
	if($objs -ne $null){
		return $objs
	}
	else{
		$Host.get_UI().WriteErrorLine("can't get list of surveys!")
		return $null
	}
}
function survey-add{
param(
[string]$url,
[string]$session,
[string]$title,
[string]$lang="ru",
[string]$fmt="G"
)
[long]$id = Random(999999)
	$data = "<?xml version=""1.0""?>
<methodCall>
   <methodName>add_survey</methodName>
   <params>
      <sSessionKey>
         <value>"+$session+"</value>
      </sSessionKey>
      <iSurveyID>
         <value/>"+$id+"</value>
      </iSurveyID>
      <sSurveyTitle>
         <value>"+$title+"</value>
      </sSurveyTitle>
	  <sSurveyLanguage>
	  	<value>"+$lang+"</value>
	  </sSurveyLanguage>
	  <sformat>
	  	<value>"+$fmt+"</value>
	  </sformat>
   </params>
</methodCall>"
	Write-Host (PostWebRequest $url $data)
}

	$session_key = (survey-get-session $url) # work!
	if($session_key -ne $null){
		Write-Host ("session = "+$session_key)
		(survey-list-surveys $url $session_key) | ft –AutoSize # work!
		Write-Host (survey-add $url $session_key "Test survey from RPC") # not work!
		Write-Host (survey-release-session $url $session_key) # work!
	}