小型家用光伏水泵揚(yáng)水系統(tǒng)的研究
[Abstract]:Nowadays, energy and environmental problems have become a major concern of the governments of all countries. As a renewable energy, the utilization of solar energy and photovoltaic power has developed rapidly. With the increasing shortage of fresh water resources, the problem of difficult to use electricity and water is difficult in the areas where the developing countries are still not covered by the power grid. The research of photovoltaic pump system with practical value and social value is of great significance.
Based on the analysis of the characteristics of photovoltaic panels and the working principle of the pump, a new type of photovoltaic water pump water lifting system is developed. The system uses photovoltaic cells as the power supply of the system. The DC brushless motor without position sensor is used as the driving motor of the pump, and the PIC16F877A MCU is used as the main control chip of the system. In order to improve the power and efficiency of the photovoltaic water pump system, the paper focuses on the relationship between the maximum power point tracking algorithm based on the improved variable step length admittance increment method and the output power of the photovoltaic cell and the flow rate of the pump. In order to make the PV pump system run steadily and reliably, the paper also studies the zero crossing point detection of the back EMF and the commutation of the motor. As well as the "three stage" starting method, a "virtual neutral" method is used to detect the zero crossing point of the back EMF. The paper uses the combination of hardware and software to control the system.
In order to verify the performance of the system, the system has been simulated and tested. The results show that the developed photovoltaic water pump system can always work in the maximum power state. The system can start smoothly in both sunny and cloudy days, and the system is efficient, reliable and stable.
【學(xué)位授予單位】:廣西大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:TH38
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