A novel utility interfaced high-frequency link photovoltaic power conditioning system

Utility-line-interfaced photovoltaic power conditioning (PVPC) systems are gaining popularity in augmenting energy. PVPC systems utilizing a high-frequency (HF) isolation link have the well-known advantages of small size, light weight, etc. Here, a utility interfaced HF-link PVPC system is presented. The system discussed consists of a resonant (load commutated asymmetrical silicon-controlled rectifier) (ASCR) HF inverter, a rectifier, and a line-commutated inverter working with a power factor near unity. An HF transformer provides the isolation between the photovoltaic array and the utility line. The HF resonant inverter uses an LCC type commutation circuit and has inherent fault-protection capability under a number of fault conditions. The working details of the scheme are presented together with logic circuit schematics. Experimental results obtained with a prototype unit are also given