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International Journal of Photoenergy
Volume 2017 (2017), Article ID 5051489, 11 pages
https://doi.org/10.1155/2017/5051489
Research Article

Synergetic Control of Grid-Connected Photovoltaic Systems

School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing 210042, China

Correspondence should be addressed to Xiaohui Li; nc.ude.unjn@11016

Received 8 October 2016; Revised 26 November 2016; Accepted 16 January 2017; Published 29 March 2017

Academic Editor: Md. Rabiul Islam

Copyright © 2017 Junjie Qian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

It is important to improve the dynamic performance and the low-voltage ride-through (LVRT) capability of a grid-connected photovoltaic (PV) system. This paper presents synergetic control for the control of a grid-connected PV system. Modeling of a grid-connected PV system is described, and differential-algebra equations are obtained. Two control strategies are used in normal operation and during LVRT of a PV system. Practical synergetic controllers with two control strategies are synthesized. The mathematical expressions are derived for computing control variables. The design of the synergetic controllers does not require the linearization of the grid-connected PV system. A grid-connected PV system with synergetic controllers is simulated in Simulink surroundings. The control performance is studied in normal operation and during LVRT. Simulation results show that the synergetic controllers are robust and have good dynamic characteristics under different operation states.