A new grid-connected PV system based on cascaded H-bridge quasi-Z source inverter

Dongsen Sun, Baoming Ge, Fang Zheng Peng, Haitham Abu-Rub, Daqiang Bi, Yushan Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

79 Citations (Scopus)

Abstract

A new scheme for grid-connected photovoltaic (PV) interface by combination of a quasi-Z source inverter (qZSI) into cascaded H-bridge (CHB) is proposed in this paper. The proposed scheme enables PV string voltage boost to a higher level, and solves the imbalance problem of DC-link voltage in traditional CHB inverters. A multilevel voltage waveform of inverter output is generated by an improved phase shifted sinusoidal pulse width modulation (PS-SPWM) algorithm, which introduces shoot-through states into the conventional zero states to control qZS-CHB module. The effective control schemes are proposed to regulate the maximum power point tracking (MPPT) of each string, and control the DC-link voltage of each H-bridge, respectively. Grid injected power is controlled corresponding to the proportionality factors of each PV string output power. A 1.5 kW system is built in MATLAB/SIMULINK, and the simulation results verify the proposed novel multilevel PV interface inverter and its control principles.

Original languageEnglish
Title of host publicationProceedings - 2012 IEEE International Symposium on Industrial Electronics, ISIE 2012
Pages951-956
Number of pages6
DOIs
Publication statusPublished - 2012
Event21st IEEE International Symposium on Industrial Electronics, ISIE 2012 - Hangzhou, China
Duration: 28 May 201231 May 2012

Other

Other21st IEEE International Symposium on Industrial Electronics, ISIE 2012
CountryChina
CityHangzhou
Period28/5/1231/5/12

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering

Cite this

Sun, D., Ge, B., Peng, F. Z., Abu-Rub, H., Bi, D., & Liu, Y. (2012). A new grid-connected PV system based on cascaded H-bridge quasi-Z source inverter. In Proceedings - 2012 IEEE International Symposium on Industrial Electronics, ISIE 2012 (pp. 951-956). [6237218] https://doi.org/10.1109/ISIE.2012.6237218