Grid-Connected Control Strategy Based on Fixed Mi Coefficient for Single-Phase Photovoltaic System

Abstract:

This paper presents a grid-connected control strategy for single-phase photovoltaic (PV) system. Voltage source inverter (VSI) of a PV system is a core component which will produce some harmonics when the switch is operated between on and off continuously. To suppress harmonic distortion in the VSI output current, a fixed modulation index (MI) control loop based on PI controller is added to the traditional double closed-loop. The proposed method can fix the MI coefficient to be a large value in any conditions. The design of the controller and the stability of the grid-connected system are discussed in detail. Simulation and experiment results are presented to demonstrate the dynamic and precision performance of the controller for harmonic suppression when the proposed PV system is connected to the grid.

• Periodical: Applied Mechanics and Materials (Volumes 494-495)
• Pages: 1764-1770
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.494-495.1764
• Online since: February 2014
• Authors: Wen Jie Zhu, Fei Rong*, An Luo, Yong Xu, An Ping Hu
• Keywords: Fixed Modulation Index (MI) Coefficient, Grid-Connected Control, Harmonics, Photovoltaic (PV), Stability

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