LCT諧振式高頻隔離型光伏并網(wǎng)逆變器的研究
[Abstract]:From the long-term development of energy, new energy will replace conventional energy. From the recent development, new energy is bound to become an important part of the electricity market. As an important part of the new energy field, photovoltaic power generation industry has developed rapidly in the past decade. Photovoltaic grid-connected inverter, as the core component of energy conversion and control, has become the focus of scholars at home and abroad. According to the development trend of miniaturization and high power density of power equipment, this paper studies a LCT resonant high-frequency isolated photovoltaic grid-connected inverter, which has the advantages of light weight, high power density and electrical isolation. It is suitable for single phase, medium and small power distributed photovoltaic grid-connected generation system. Firstly, the topology of inverter is introduced, the working mode of the circuit is briefly described, and the function of each module of the circuit is explained. The sinusoidal pulse width modulation mode is deduced in detail, and the working modes when the phase shift angle is less than the critical phase shift angle when the circuit works in the resonant state are analyzed, and the feasibility of the scheme is proved. Then the steady state of the circuit model is analyzed and the resonant equivalent model is established. The influence of the resonant cell parameters on the gain, soft switching and efficiency of the inverter is obtained, and the principle of designing the resonant parameters is given. Secondly, according to the working characteristics of the circuit topology, a closed-loop control strategy including voltage feedforward and dead-time compensation is designed to realize efficient and stable grid-connected operation of inverter unit power factor. The maximum power point tracking, dead-zone compensation, phase-locked loop technology and islanding detection are systematically explained from principle to simulation. Then the stability of the control system is analyzed theoretically, the feasibility of the closed-loop system is verified, and the whole inverter system model is established. Finally, according to the proposed circuit topology and control strategy, the hardware and software systems of the prototype are designed, and the inverter runs stably and efficiently under the closed-loop control system. By analyzing the waveforms of each link of the prototype, the feasibility of the hardware and software system and the correctness of the theory are proved, which provides a reference for the further study of this kind of inverter.
【學(xué)位授予單位】:北方工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM464;TM615
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