| Abstract |
A special application of a co-generation system was developed for producing electrical and heat energy from low pressure saturated steam or some other working medium is presented in the paper. The system consists of a high speed turbine, coupled to a three-phase permanent magnet synchronous generator, a three-phase AC/AC converter and a microprocessor supervisory control unit. The main purpose of the system is to reduce the pressure of the working medium by a turbine instead of throttling valves thus producing electric energy, that can be utilised directly to supply loads in stand-alone mode or feeding it back to existing utility mains. In the latter case the converter connected in parallel to the mains can serve also as a source of reactive ppower and higher harmonic current components, i.e. the converter, by changing its control method, can be turned into a system providing not only active power, but functioning as a complete active filter or ac line conditioner at the same time. Details of the technical solution and results of analyses, comparison of various control strategie are also described in the paper. |
