A Single-Stage Three-Phase Grid-Connected Photovoltaic System With Modified MPPT Method and Reactive Power Compensation

• Published in: IEEE transactions on energy conversion Vol. 22; no. 4; pp. 881 - 886
• Main Authors: Wu Libo, Wu Libo, Zhao Zhengming, Zhao Zhengming, Liu Jianzheng, Liu Jianzheng
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2007; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Compensation; Control systems; Digital signal processing; Grid-connected inverters; Maximum power; maximum power point tracking (MPPT); photovoltaic (PV); Photovoltaic cells; Photovoltaic systems; Power electronics; Pulse width modulation inverters; Reactive power; Solar cells; Solar energy; Solar power generation; Stability; Synchronism; Topology; Voltage control; solar energy; maximum power point tracking (MPPT); Grid-connected inverters; photovoltaic (PV)
• ISSN: 0885-8969; 1558-0059
• DOI: 10.1109/TEC.2007.895461

Single-stage grid-connected photovoltaic (PV) systems have advantages such as simple topology, high efficiency, etc. However, since all the control objectives such as the maximum power point tracking (MPPT), synchronization with the utility voltage, and harmonics reduction for output current need to be considered simultaneously, the complexity of the control scheme is much increased. This paper presents the implementation of a single-stage three-phase grid-connected PV system. In addition to realize the aforementioned control objectives, the proposed control can also remarkably improve the stability of the MPPT method with a modified incremental conductance MPPT method. The reactive power compensation for local load is also realized, so as to alleviate grid burden. A DSP is employed to implement the proposed MPPT controller and reactive power compensation unit. Simulation and experimental results show the high stability and high efficiency of this single-stage three-phase grid-connected PV system.