New multi-stage DC–DC converters for grid-connected photovoltaic systems

Abstract

a b s t r a c tRenewable energy is high on international and national agendas. Currently, grid-connected photovoltaic (PV) systems are a popular technology to convert solar energy into electricity. Existing PV panels have a relatively low and varying output voltage so that the converter installed between the PVs and the grid should be equipped with high step-up and versatile control capabilities. In addition, the output current of PV systems is rich in harmonics which affect the power quality of the grid. In this paper, a new multistage hysteresis control of a step-up DCeDC converter is proposed for integrating PVs into a singlephase power grid. The proposed circuitry and control method is experimentally validated by testing on a 600 W prototype converter. The developed technology has significant economic implications and could be applied to many distributed generation (DG) systems, especially for the developing countries which have a large number of small PVs connected to their single-phase distribution network.

A Comprehensive Review on Grid-TiedSolar Photovoltaic System

“…Commonly buck converters are used to track MPP to extract maximum power [74][75][76]. Some highly efficient microcontroller based buck converters for PV applications are proposed by the researchers [77]. The output power is regulated by using some intelligent approaches to adjust the duty ratio in standalone applications [78].…”

“…The first category [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] covers the PV modelling and PV array designing. The second category is based on MPPT methods and their detailed study while third and fourth categories are based on converter [74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91] and inverter topologies [92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107][108]…”

Modeling and Simulation of Buck-Boost Converter with Voltage Feedback Control

“…The theory of state-space averaging applied in the switch-mode power converter was conceived in the early 1970s and well developed in the early 1980s [6]. Dr. Robert Middlebrook and his graduate student Dr. Slobodan Cuk were credited with the concept and techniques associated with it.…”

DC‐type grid‐connection system of PV generation and its control schemes

“…Besides, the response time and effectiveness of the MPPT control not only restraint each other but also are influenced by the scale of the PV generation . According to different scales of PV generations, the configuration of PV stations mainly includes the centralized type and string type, as illustrated in Figures A,B, respectively . In Figure A, PV panels are connected in series/parallels.…”