Research On Key Technologies Of None-isolated Photovoltaic Grid-Connected Inverter

Nowadays, with the increasing of energy exhaustion and environment pollution, the utilization of photovoltaic technology has become a hotspot of the whole world. The main utilization of solar energy will be the grid-connected photovoltaic system. The core technology of the grid-connected photovoltaic system is grid-connected inverter. In this article the single-phase isolated inverter is designed and the hardware is constructed. It provides the main circuit of the hardware. Aiming, at the features of grid-connected PV system, a kind of grid-connected control strategy is presented, which is based on one cycle control. The problem of integrator, which is supposed to be reset instantaneously, can be overcome and the good performances, the fast dynamic response and admirably suppressing the perturbation, are preserved. The average current is accessed by using synchronizing the on-chip analog-to-digital function of DSP56F803.