A basic study on a parallel resonant link converter for a high frequency link system

The parallel resonant link high frequency power distribution system can be an attractive system as a supplementary local distribution line linked with an existing AC commercial system line in a building or a plant, if some new energy sources and energy storage systems are combined and connected with the link. This paper deals with some basic issues of a unit converter for such systems from both microscopic (stable switching operation) and macroscopic (energy flow) points of view. A PDM (pulse density modulation) gate control circuit for stable operation and self start-up from standstill is tested. The effect of PDM sampling period on steady state waveforms is compared for three cases. The bad effect of parasitic capacitance of the switching arm is shown, and its countermeasure is given. Based on the probabilistic switching function technique, a DC equivalent circuit model suited for simulating macroscopic energy flow is proposed