Power generation apparatus and power system

A power generation apparatus, comprising:

• a first transportation means, having a first platform, wherein a first housing is provided on the first platform,
• a gas turbine, arranged in the first housing and having a first input terminal and a first output terminal, and
• a generator, arranged in the first housing and having a second input terminal and a second output terminal,
• an exhaust passage, arranged in the first housing and located between the gas turbine and the generator,
• wherein the first output terminal is connected with the second input terminal, and the generator is disposed rearmost on the first platform,
• the first output terminal and the second input terminal are connected through a coupling,
• the exhaust passage comprises a volute exhaust structure, the volute exhaust structure comprises an annular housing, and the annular housing comprises a central passage and a first exhaust opening, and
• the coupling passes through the central passage to connect the first output terminal and the second input terminal, and the annular housing surrounds the coupling.