The Research Of Photovoltaic Grid-connected Generation Control Strategy

This thesis completed the task is Grid-connected PV system design and controlStrategy research. The first describes the grid-connected PV systems the Background andSignificance, Analysis of the photovoltaic power generation system development status athome and abroad. A brief analysis of grid-connected PV system structure and workingprinciple, For grid-connected PV systems more difficult to solve islanding detection donea detailed analysis of the discourse, AFD and the proposed disturbance AFDPFcycle-based detection method and its made the corresponding simulation. OnPhotovoltaic Maximum Power Tracking Control introduces the constant voltage controlmethod、Incremental conductance method, perturbation and observation method, Threeclassic maximum power point tracking control algorithm, Proposed variable stepincremental conductance method and its MPPT control algorithm and make thecorresponding simulation analysis. Finally a detailed analysis discusses the photovoltaicinverter control system, Proposed types of technology and the development of theinverter，SVPWM technique analyzes the basic principles and algorithms. For sectorswhere the judgment reference voltage vector, Calculate X, Y, Z and SVPWM algorithm todo the analysis for research, SVPWM algorithm combined for double-loop current andvoltage control to do the simulation analysis.