I need to read existing dacpac using powershell and change schema then replicate the database. Is there any possibility to use "System.Reflection
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There is a full public API that supports loading dacpacs, reading the contents (tables, views etc. in the schema), and adding / updating these contents before saving back. The samples project is at https://github.com/Microsoft/DACExtensions, with a tutorial explaining core concepts here. There are a number of additional examples, such as Ed Elliott's blog and open source contributions that can help you understand what to do.
Disclosure: I work on the DacFx team and wrote the linked tutorial.