POWER-SYSTEM APPLICATIONS FOR PASC CONVERTER SYSTEMS

This paper shows, using computer EMTP simulations, some preliminary re sults of applying pulse amplitude synthesis and control (PASC) technol ogy to single-source voltage converter systems. The method can be appl ied to any single terminal pair source with appropriate modifications in power extraction interface and computer control program to match so urce and load impedance characteristics. The PASC realization as discu ssed here employs banks of transformers, one bank per phase, in which the primaries are connected in parallel through a switch matrix to the de source. Two opposite polarity primaries per transformer are pulsed alternatively in time to produce an oscillatory sinusoidal output wav eform. PASC conversion system capabilities to produce both leading and lagging power factor power output in single-phase and three-phase Del ta or Upsilon configurations are illustrated. EMTP simulations are use d to demonstrate the converter capabilities. Also included are discuss ions regarding harmonics and potential control strategies to adapt the converter to an application or to minimize harmonies.