基于DSP的光伏水泵系統(tǒng)研究
[Abstract]:Facing the increasingly tense energy problem, the development of new energy and the realization of sustainable economic development have become the consensus of the world. In Northwest China, the sun is abundant, but the groundwater resources are not fully utilized, which seriously affects the quality of life of people in this area. The development and use of photovoltaic pump is a way to effectively utilize light energy, and it can also solve the drinking water problem of people in this area. At present, the bottleneck of photovoltaic pump system is that the efficiency is too low, so it is necessary to study the control strategy to improve the efficiency of photovoltaic pump system. Based on this, this paper mainly studies the portable low power photovoltaic pump control system with the functions of maximum power tracking (MPPT) and variable voltage conversion (VVVF). This paper mainly introduces the full bridge high frequency boost rectifier circuit, IPM inverter circuit, driving circuit with IR2100S as the core, and control circuit with TMS320F2812 as the core. The system adopts variable voltage variable frequency (VVVF) control based on space voltage vector pulse width modulation (SVPWM) to realize high performance operation and full digital control of three phase asynchronous motor. The main work of this paper is as follows: 1. The structure of photovoltaic pump system is analyzed and compared, and the main circuit structure of photovoltaic pump is determined. 2. The hardware design and component parameter selection of photovoltaic pump control system are analyzed in detail. 3. The principle and algorithm of SVPWM modulation and VVVF control are deeply studied. VVVF is mainly used to adjust the speed of the pump, in order to make the pump run in high efficiency and make the pumping flow of the pump larger. 4. The output characteristics of solar cells are deeply studied, and several commonly used MPPT algorithms are analyzed and compared. Combined with their advantages and disadvantages, an improved fixed step size MPPT algorithm is proposed to make the photovoltaic array output the maximum power. Make pump motor gain more energy. 5. A 180 W prototype is designed, and the experimental waveform is given. The experimental results show that the system can meet the design requirements.
【學位授予單位】:揚州大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:TH38;TM615;TM343.2
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