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Single-stage grid-connected PV system with MPPT Research and Implementation

Author: GuXueZuo
Tutor: SunPeiDe
School: Donghua University
Course: Power Electronics and Power Drives
Keywords: Single-stage photovoltaic inverter New MPPT algorithm Based on the voltage loop and dp / dv compensation MPPT algorithm DSP2812
CLC: TM615
Type: Master's thesis
Year: 2011
Downloads: 392
Quote: 0
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Abstract


World energy shortage problem is very serious , we have been working to develop new energy sources , wind, biomass , hydro, solar and other renewable energy has become the main development of new energy objects. Among these, solar energy as an important renewable energy development, its resource potential, low environmental pollution , but also has flexible installation, and other energy resources and strong complementary advantages. In recent years, the global average annual total renewable energy rankings, ranked first solar photovoltaic power generation has become an important development direction of energy . This paper studies the single-phase single -stage grid-connected PV systems and MPPT technology . Starting from the basic structure of the inverter design circuit parameters structure, built in Simulink of Matlab simulation model . Also studied the maximum power point tracking technology, the research of new MPPT algorithm simulation model validation , and finally in the actual system application . First, the analysis of the inverter structures were designed preamp circuit filter capacitor energy storage , post-stage filter inductor and SPWM prediction algorithm . According to the designed circuit structure and parameters in the Matlab Simulink simulation model created to complete the DC-AC inverter function, the realization AC inverter current THD lt; 5%. Secondly , research the maximum power point tracking technology . Analysis of classical MPPT algorithm - constant voltage method, the disturbance observer method, three center of gravity method and incremental conductance method . Photovoltaic cells based on classical algorithm and transfer characteristics of the operating point with the environment , design new and improved method and voltage disturbance observer loop dp / dv Compensation Act . The new MPPT algorithm simulation model Embeded Function in programming , and through the oscilloscope detects the maximum power point tracking effectiveness and efficiency of the inverter , a comparative analysis with the classical algorithm , to obtain satisfactory results. Final design of the hardware system and software program that enables inverter system to work properly. The MPPT algorithm implemented on DSP2812 eventually AC inverter current THD is less than 5 %, maximum power point tracking efficiency greater than 99% . This paper gives a detailed experimental simulation models and algorithms to build the experimental hardware and software platforms , high reliability, waveform data and reliable inverter power up to 3000W, and successfully into the grid electricity.

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