In this paper the concept of integration of synchronous generator and power electronics converter is motivated and developed, wherein wound rotor synchronous generator and power electronic converter are connected parallel. According the integration concept the wound rotor synchronous generator is source of active power whereas the power electronic converter is source of reactive power. Thus the synchronous generator power factor moves from cosφ = 0.8 to cosφ = 1 and produces 25% more of active power keeping the synchronous generator rated current. Moreover volt-ampere power of the generation system rises 25%. If power converter is equipped in energy storage then it may deliver active and reactive power what, in transient states keeps stability of generated voltage and frequency. Such a generation system that contains wound rotor synchronous generator and integrated power electronic converter is called Synchrogenverter. A control concept of the integrated generation system is developed. Computer simulation study presents performance of the new arrangement in transient and steady state.

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The paper describes new topology of a generation system that consists of wound rotor synchronous generator and parallel connected power electronic converter. The wound rotor synchronous generator operates as AC voltage source whereas the power electronic converter as fully controllable current source. The converter with embedded energy storage delivers active and reactive power. The first main role of the converter is to deliver reactive power, what results in zero reactive power demanded from the synchronous generator. Thus the synchronous generator moves from cos = 0.8 to cos = 1. So if the generator keeps its rated current and unity power factor than its active power rises about 25%. Moreover the operation with cos = 1 results in significant reduction of its excitation current. Additionally the ability of quick production of the active and reactive power, by the parallel connected converter, keeps voltage and frequency stability in transients and so it permits to accept step load. Such a generation system that consists of the wound rotor synchronous generator, the parallel power electronic converter and common control of power flow is called "Synchrogenverter". Paper presents theory and computer simulation study related to high power Synchrogenverter operating off grid (autonomously).