Research On Solar Photovoltaic Grid-Control System

Nowadays,with the increasing burden on energy exhaustion and environment pollution,as a cleanly and renewable energy,Solar Energy has became a hotspot of the whole world .In the photovoltaic power generation systems, characteristics of PV array output nonlinear features, and its output by light intensity, temperature and load impact, the paper is in this context, solar power generation system on the core Device and inverter for a more in-depth study.Two core part of the solar photovoltaic power generation system is maximum power point tracking (MPPT) controlled the solar panel and photovoltaic inverter control.In this paper the working principle and working properties of solar cells are firstly introduced, work on the equivalent circuit and mathematical models of the solar battery analyzed in detail; After comparing the PV inverter main circuit structure and control strategy ,this paper advance the design of the single Photovoltaic grid-connected inverter using two-stage grid structure; Followed by Analyzing and comparing several conventional maximum power point tracking (MPPT) control algorithm, this presents their respective advantages and disadvantages, and designs MPPT control proposed implementation process for the two-stage grid structure inverter; Finally, using TI's TMS320LF2407 as CPU, and applying on POWER SYSTEM BLOCKSETS software tools to establish a photovoltaic power system dynamic model, PV systems is simulated. The simulation results show that the control strategy and design using the dynamic model can meet and network requirements, the system can be safe and stable operation.