Research on Control Strategy of PV MPPT and Grid-Connected Single Phase Converter Based on Two Stage Topology

Abstract:

This paper studied the control strategy of single-phase two-stage grid-connected photovoltaic generation system. The two-stage topology includes the boost converter and single phase inverter. The function of maximum power point tracking (MPPT) is achieved in the boost circuit by IC (Increment Conductance) method. The inverter circuit adopted the double-closed loop control, a DC voltage outer loop control for power balance with PI correction and an AC current inner loop control for feedback designed to ensure the current quality and stabilize the DC voltage. The inner loop used the novel quasi-Proportional-Resonant (PR) controller, which has a better steady tracking characteristics and stronger anti-interference ability to the disturbance. Finally, a simulation system is built with Matlab/Simulink in this paper to verify the validity of the MPPT algorithm and the quasi-PR control strategy.Keywords：Photovoltaic Generation System;Maximum Power Point Tracking; Grid-connected Inverter; quasi-Proportional-Resonant (PR) controller

• Periodical: Applied Mechanics and Materials (Volume 535)
• Pages: 97-101
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.535.97
• Online since: February 2014
• Authors: Chun Xue Wen*, Zhen Zang, Zheng Xi Li
• Keywords: Grid-Connected Inverter, Maximum Power Point Tracking (MPPT), Photovoltaic Generation System, Quasi-Proportional-Resonant (PR) Controller

References

[1] Freris L, Infield D. Renewable energy in power systems[M]. John Wiley & Sons, (2008).

[2] DONG Mi, LUO An. Design and control strategies of inverters for a grid-connected photovoltaic power system[J]. Automation of Electric Power Systems, 2006, 30(20): 97-99.

[3] ZHANG Housheng, ZHAO Yanlei. Single-phase double-stage photovoltaic grid-connected inverter[J]. Electric Power Automation Equipment, 2010, 30(8): 95-99.

DOI: 10.1109/icacc.2010.5487010

[4] XIONG Yuansheng, YU LI, XU Jianming. MPPT control of photovoltaic genereation system combining constant voltage method with perturb-observe method[J]. Electric Power Automation Equipment, 2009, 29(6): 85-88.

[5] Esram T, Chapman P L. Comparison of photovoltaic array maximum power point tracking techniques[J]. Energy conversion, IEEE transactions on, 2007, 22(2): 439-449.

DOI: 10.1109/tec.2006.874230

[6] Hussein K H, Muta I, Hoshino T, et al. Maximum photovoltaic power tracking: an algorithm for rapidly changing atmospheric conditions[J]. IEE Proceedings-Generation, Transmission and Distribution, 1995, 142(1): 59-64.

DOI: 10.1049/ip-gtd:19951577

[7] CHENG Junzhao, WU Xike, LI Shusen, et al. Boost based two -level grid-connected photovoltaic inverter system[J]. High Voltage Engineering, 2009, 35(8): 2048-(2052).

[8] JIN Yuanyuan. Based on the PR control of grid-connected inverter study[D]. Hangzhou: Zhejiang University, (2008).