非隔離型單相光伏并網(wǎng)逆變器及其共模電流抑制的研究
[Abstract]:With the global energy crisis and environmental pollution increasingly serious, the development and utilization of clean renewable energy is imperative, in which solar energy as renewable energy, not only green, but also widely distributed, has received extensive attention. Photovoltaic grid-connected power generation is an important way to use solar energy, and photovoltaic grid-connected inverter as the core of photovoltaic grid-connected generation system, its efficiency affects the efficiency of the whole photovoltaic grid-connected generation system. Among all kinds of photovoltaic grid-connected inverters, non-isolated photovoltaic grid-connected inverters are popular because of their advantages such as small size, high efficiency and low cost. However, the common-mode current of the non-isolated system is a potential threat to the safety of human beings and equipment. Based on this, aiming at the non-isolated single-phase photovoltaic grid-connected inverter and its common-mode current suppression, this paper carries on in-depth research as follows: firstly, the principle of isolated photovoltaic grid-connected inverter and non-isolated photovoltaic grid-connected inverter is analyzed. The advantages and disadvantages of each are compared. Secondly, the generation mechanism of common-mode current and the effect of parasitic capacitance on common-mode current of non-isolated single-phase photovoltaic grid-connected inverter are analyzed. Based on the inverter topology and PWM modulation strategy, the common-mode current suppression method is studied from the angle of changing the modulation mode and topology. The validity of the common-mode current suppression method is verified by the MATLAB simulation platform. Thirdly, the control strategy of two-stage photovoltaic grid-connected inverter is studied and analyzed. The variable step-size perturbation observation method is used to realize the maximum power point tracking (MPPT), of photovoltaic array, which solves the oscillation and misjudgment problems of the constant step-size disturbance observation method. The double closed loop control strategy is adopted in the back stage inverter circuit, which stabilizes the voltage of the intermediate DC side and realizes the fast control of the current. Through the establishment of MATLAB simulation platform, the feasibility of the control strategy is verified. Finally, on the basis of theoretical analysis and simulation, the hardware and software design of the system is carried out. DSP2812 is used as the control core, and the experimental platform of photovoltaic grid-connected power generation system is built. The experimental results are consistent with the simulation results, which verify the feasibility of the system design and the effectiveness of the common-mode current suppression method.
【學位授予單位】:安徽工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM464;TM615
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