Digital proportional multi-resonant current controller for improving grid-connected photovoltaic systems

RENEWABLE ENERGY

卷:76

Article

Almeida, Pedro M.¹  Barbosa, Pedro G.¹  Oliveira, Janaina G.¹  Duarte, Jorge L.²  Ribeiro, Paulo F.³ 

[1] Univ Fed Juiz de Fora, Elect Engn Program, Power Elect & Automat Grp, BR-36036900 Juiz De Fora, MG, Brazil

[2] Eindhoven Univ Technol, Dept Elect Engn, NL-5600 MB Eindhoven, Netherlands

[3] Univ Fed Itajuba, Inst Elect Engn, BR-37500903 Itajuba, MG, Brazil

关键词: Digital controller;    Resonant compensator;    Current controller;    Grid-connected;    Photovoltaic;    Discrete-time modeling;   

DOI  :  10.1016/j.renene.2014.11.087

来源: Elsevier

【 摘 要 】

This paper presents the modelling and design steps of a digital proportional multi-resonant controller. used in a grid-connected photovoltaic (PV) system. It is shown that the use of only one Proportional-Resonant (PR) compensator, tuned to the system fundamental frequency, may have its effectiveness compromised due to nonlinearities in the system components. To overcome this drawback and improve the system's output current waveform, a multi-resonant controller is introduced. The performance of the discrete-time designed controller is tested on a grid-connected photovoltaic power plant. Experimental results obtained with the operation of a 30 kWp PV system connected to a distribution network, using only the leakage inductances of a connection transformer as passive filter are presented and discussed to demonstrate the performance of the designed control strategy. (C) 2014 Elsevier Ltd. All rights reserved.

【 授权许可】

Free