Research On The Minitype Grid-Connected Photovoltaic Control Syetem

Intelligent Photovoltaic Grid-Connected Inverter is designed to control the switching process between different working modes.There are two working modes, Grid-Connected mode and Independent mode. The main function of the common grid connected inverter is grid connected photovoltaic power generation. It can increase the diversity of grid energy sources. Intelligent Photovoltaic Grid-Connected Inverter can switch between the different modes.This paper analyzes the system functional requirements and control strategy.The most important thing for the system is the stability, reliability and security.First of all,this paper analyzes the design requirements and relevant control strategy. Through the analysis of the system function, completed circuit structure selection and filter circuit design.Secondly,the circuit and the program are designed based on the simulation of the control system. Analysis the design of hardware circuit,then calculate the details of circuit parameters,including MCU and signal detection circuit.And then, the switching technology bteween different work modes is the key technology. Possible solutions are put forward to solute the problems when switching mode. Correct control strategy and control method are the critical things for smooth switching. Based on theoretical analyses,the select of the control mode under different working modes are implemented.Related software is used to complete the simulation of different working modes.At last, aceording to the results of analysis, an experimental prototype is developed with MCU.Theoretieal analysis is verified by the experiment results. To solve the final problems of the system, possible methods are proposed to improve the control method.