Research On The Control Strategy And The Islanding Detection Technology Of Photovoltaic Grid-Connected System

With the continuous progress of the economy, the non-renewable energy gradual depletion, exploring new renewable energy has an important significance to the development of the world. By its own advantage, solar energy is the clean new energy that can be vigorously the development and utilization in the future. It that the essence of the photovoltaic (pv) grid power generation technology is to make the solar power system and power grid connect, realize the grid-connected photovoltaic (pv). Here, we take a further discussion about the technology of photovoltaic (pv) grid.First of all, this article illustrates the background of the development and utilization of solar energy technology and the significance of study. The photovoltaic (pv) grid system structure and key technology are discussed in this paper. And it is presented that the grid way with two levels of structure and without transformer.Secondly, for common islanding of photovoltaic (pv) grid power generation system, this paper make a in-depth study. Comparing islanding actively active frequency drift method with the phase shift method, we simulate the experiment. And we find that phase shift method on the islands detection has the higher quality of power supply.At last, the paper proposes the double closed loop control of single-phase photovoltaic grid solar power generation system design scheme that bases on the bacteria foraging optimization algorithm, makes use of the Matlab/Simulink simulation platform for the system dynamic simulation. We designed the single-phase photovoltaic (pv) grid powerful generation system account for the TMS320LF2407 model of DSP. And through analyzing its hardware and software, it can provide an experimental platform for large ground type solar photovoltaic grid generation system.