In most of frequency response type program, it is common to assume that all harmonic sources have the same phase angle. In this paper this assumption is investigated for distorting loads with diode rectifier front ends. Based on these investigation correct equivalent models of distorting loads are proposed firstly on one distribution feeder and secondly for distribution feeders in different sub...

Earlier models of quality differentiation showed that the qualities, of differentiated products, were lowered below efficient levels. Recently, qualities were shown to be enhanced, not degraded, in some cases. This paper presents a complete characterization of quality choices under vertical product differentiation by incorporating and refining assumptions on consumer preferences and production ...