含儲(chǔ)能裝置的獨(dú)立光伏發(fā)電系統(tǒng)研究
[Abstract]:With the rapid development of human society, fossil energy alone can not meet the increasing demand for energy. At present, the world is looking for its replacement. Some clean, efficient and cheap renewable energy sources, such as solar, wind, geothermal and so on, should be well developed. The use of renewable energy can also control atmospheric pollution caused by excessive use of fossil energy, so many countries are encouraging and supporting new research in this area. Of all the energy sources, solar energy is the richest in the world. Only 30 percent of the sun's light is reflected back into space, and the remaining 70 percent is absorbed by the earth's surface. In recent years, with the development of the material technology of photovoltaic cells, the efficiency of photovoltaic cells has been improved, and photovoltaic arrays are formed by series-parallel combination of photovoltaic cells. It can meet the needs of many different applications such as high power or low power. In this paper, the structure of the system and the control of each part are studied, aiming at the household independent photovoltaic power generation system. The system includes PV array boost rectifier, single phase photovoltaic inverter, battery, bidirectional DC/DC converter and AC / DC load. In order to maximize the output power of photovoltaic array, the maximum power point tracking control (MPPT) is used to track the maximum power point in real time. In the household system, the single-phase photovoltaic inverter is usually used to supply AC load. On the basis of modulation method and control strategy, a single-phase inverter control algorithm based on voltage RMS closed-loop control is designed, aiming at the traditional PI control can not track sinusoids without static error. It can be used to track sinusoidal signal without static error, has good dynamic and static characteristics, and is simple in principle and easy to realize. The energy storage device is indispensable in household system. In this paper, lead-acid battery is used as energy storage device, and its structure is analyzed. The principle and model are studied. The bidirectional DC/DC converter plays an important role in the control of battery charge and discharge and DC bus voltage. On the basis of analyzing the topology of the converter, the Buck mode and the Boost mode of the converter are modeled, and the one-step model predictive control and the satisfactory optimization control are used to control the converter. Simulation results verify the effectiveness of the control algorithm. According to the real time relationship between the output power and the load power of the photovoltaic array in the household system and combined with the charging state of the battery, the energy management strategy of the system is designed in this paper. The strategy classifies the load according to the degree of importance, and establishes five working modes, which greatly improve the reliability of the system. Finally, the simulation of the whole system is built in MATLAB/SIMULINK, which verifies the effectiveness of each part of the control algorithm and observes the operation effect of the system in different working modes.
【學(xué)位授予單位】:中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM615
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