Year: 2018
Type: conference-paper
Abstract: In view of that PI controller parameters changeswhen system model parameters of single-phase photovoltaic inverter change, a gradient reference based adaptive current loop control method is proposed.Ignoring the high order harmonics in PWM inverter, the mathematical model of the grid connected system is deduced, the reference model is selected reasonably,me according to the change parameters by using the normalized MIT adaptive law.The grid-connected current has good tracking effect on the instruction current.Control effect is insensitive to the change of the filter parameters, and has fast tracking speed and strong robustness. PrefaceWith the intensification of energy crisis and environmental pollution, more and more countries pay attention to the application of clean energy such as solar energy and wind power, and it becomesa major issue in the development of new energy at home and abroad [1,2] .The single stage PV(PhotoVoltaic) grid connected power system is composed of DC/AC converter and its control part.The controller performs the maximum power tracking and the injected grid current regulating respectively.As shown in Figure 1, two-stage PV grid-connected power generation system consists of two parts [3] , DC/DC conversion and maximum power tracking control, DC/AC inverter and grid-connected control [3] .The DC / DC converter is used to boost the DC voltage and to make the PV array output maximum power by adjusting the dutyin real time [4] .DC/AC inverter and its control part is used to stabilize the DC voltage and control the network side current [5] .DC PV array DC filter AC DC Power grid MPPT control Gridconnected control UPV IPV Udc Ig Ug Fig.1 Structure block diagram of photovoltaic power generation systemThe PV grid-connected inverter is consists of inverter, filter circuit and control system.The filter circuit generally has L, LC and LCL, and inductance filter is often used in small capacity inverter systems.The topological structure of single-phase PV grid-connected inverter is shown in FIG. 2.
Authors: Ruiping Zhang, Hongxia Lu, Jie Yang, Tingrong Zhang
Institution: Lanzhou Jiaotong University
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2806786178