Single-Phase Double-Stage PV Grid-Connected System Based on Multi-Carrier PWM

Abstract:

In the traditional single-phase grid-connected photovoltaic(PV) system, the output grid-current has the shortcoming of high harmonic distortion rate. In order to solve the problem, an improved method on the inverter is proposed. The inverter consists of full-bridge circuit and auxiliary circuit. With the multi-carrier PWM, the inverter produces output voltages in five levels, which can reduce the THD of the grid current. At the same time, the hysteresis comparison method is introduced into traditional MPPT algorithm, which greatly avoids the oscillation problem of the maximum power point. At last, the simulation results show the effectiveness of the proposed method.

• Periodical: Advanced Materials Research (Volumes 542-543)
• Pages: 1231-1237
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.542-543.1231
• Online since: June 2012
• Authors: Guo Shun Zhou, Ye Jin Lin, Yan Cheng Liu, Qin Jin Zhang
• Keywords: Grid-Connected PV Inverter, Hysteresis Comparison Method, Maximum Power Point Tracking (MPPT), Multi-Carrier PWM Technology

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