What is the difference between an open cycle power plant and a closed-cycle or combined cycle?

The difference between closed cycle gas turbine and open cycle gas turbine can be done on the basis of source of heating, types of working fluid, circulation of air, wearing capacity of turbine blades, installation, maintenance cost and much more. The basic difference between them is the circulation of working fluid. In the closed cycle gas turbine the same working fluid is circulated again and again within the turbine but in the open cycle gas turbine the working fluid i.e. air is replaced again and again while flowing through the gas turbine.

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A combined cycle plant, commonly called CCGT (Combined Cycle Gas Turbine), or TGV (Steam Gas Turbine), is a thermal power plant that combines two types of turbines: combustion turbine and steam turbine. Each of these turbines drives a generator that produces electricity ("multi-shaft" or "multi-shaft" configuration) or both types of turbines are coupled to the same generator ("single-shaft" configuration). open cycle plant contains only gas turbines so the combined cycle plant is a more economical plant than the other