The Shaft Driven Generating System goes a long way toward energy saving, space saving and labor saving on ships. For this reason, it has been used on many ships, and there have been strong requests for increased Reliability Availability and Serviceability. In order to meet the above demands, we have developed a new Shaft Driven Generating System that uses *Direct Digital Control* and *Fault Diagnosis Function*. This system consists of *Original Microcomputer module* and *Programable Controller (PLC)*.
Ever since a system for purchasing surplus power from private power generating systems was established in 1992, we have seen enthusiasm for new energy power generation rise along with interest in environmental problems. Besides, the technical guidelines provide for interconnected system with reverse power flow, had been established in 1993. We have been developing high-frequency linked inverter for photovoltaic power system. In this paper, we will describe a method for generating pulse width modulation for instantaneous current regulation with a digital signal processor, as well as a technology for peak power tracking of solar cells by microcomputer. Finally we will discuss field test results on an inverter system.
Variable Structure Systems(VSS) are discontinuous dynamic systems whose control structures are changed according to some chosen state variable(s) so as to achieve certain control objectives. In this tutorial-like paper, we shall give a brief theory of VSS and then demostrate its application to the control of the simple do-buck converter.
Recently, many methods of power-factor-correcting converters have been reported to realize a high power factor and to decrease harmonic distortion. If AC-DC buck-boost (B-B) converter is operated in discontinuous current mode (DCM), we can make input current sinusoidal and achieve a high power factor without a special control method. To realize a high power factor and decrease input ripple factor, we use a couple of B-B converter in parallel. In this paper, we present analyses of the input ripple factor, power factor, and output ripple voltage for this parallel connected B-B converter. Further more, we calculated those values theoretically and compared properties of parallel connected B-B converter with those of the usual B-B converter. In either case, the analyses are well verified by experiments.