I was not able to find a PowerShell cmdlet in the Toolkit that satisfies your requirement, but you could run the native command using the "Invoke-NcSsh" cmdlet, like this:
Invoke-NcSsh -Command "set d; y; event generate -node segotx01-01 -message-name tcpip.duplicate.ip -values 0.0.0.0 0.0.0.0"