Asynchronized synchronous machines in self-contained power systems

The increasing role of self-contained power generation and the steady rise of its share in total balance of produced electric power necessitate development and improvement of highly efficient systems of electric power supply and its quality and reliability. In this connection asynchronized synchronous machines (ASM) have high prospects for use instead of traditional synchronous machines in diesel-generator sets (DGS), motor-generators, “variable speed-constant frequency” systems, and particularly in wind power plants. The paper describes structural-and-design specific features of ASM: incorporated in DGS, which allow improvement to some technical-and-economic indices related to fuel and oil consumption, increase of DGS service life and improvement of transient performance. A general block diagram of asynchronized synchronous machine operating in generator mode (ASG) is given, as well as the basic requirements to ASG excitation system are determined and static frequency converters included in excitation circuits are compared and briefly analyzed. A number of periodical nonsinusoidal curve shape quality indices are discussed in parallel with the analysis of methods for improvement of ASG building structure with an artificially-commutated direct frequency converter as well as new unique structural-and-technical solutions possessing broadened functional capacities and improved voltage curve shapes are given. ASG output voltage curve and its sine-distortion and harmonic rejection factors are described mathematically