The Study Of Distributed PV Generation Flexible Grid-connected Technology

This paper reviews various main circuit topology and operation mode of distributed photovoltaic power generation system at home and abroad,and expounds the various kinds of topological structure and the working state of run mode PWM DC/AC power interface and power supply.Focusing on distributed photovoltaic system double PWM DC/AC grid power interface topology structure,operation mode are studied.The public power grid side PWM DC/AC power balance and active,reactive power regulation are analyzed in theory.To exchange the network side PWM DC/AC inverter driving control,the article designs the methods of the research.To exchange the network side three-phase inverter power supply PWM driving control signal generating method,the article puts forward the "one objective function","the three following principles" and "a logical relationship between" design idea,and takes several specific designs for example.In view of the public power grid side PWM DC/AC analog interface and the working mode,the article puts forward three kinds of operation modes: the distributed power transmission to the public power grid pattern,the public power grid to the energy storage system power supply mode and “camera” mode.Especially for the first two commonly used models,on the basis of theoretical analysis on the balance of active and reactive power,the article concludes the control strategies of active and reactive power regulation and control methods.Finally,in the MATLAB software platform.the article does some research and simulation tests to solve the problems of distributed power grid-conneted low voltage though and improving the ability of low voltage through.