基于混合儲(chǔ)能的光伏發(fā)電系統(tǒng)功率波動(dòng)平抑技術(shù)研究
[Abstract]:Environmental pollution has been widely concerned, new energy will gradually replace coal, oil, natural gas and other traditional fossil energy. Distributed generation technology has been widely used. Photovoltaic power generation has been rapidly developed and widely used because of its wide resource and easy access. In the independent photovoltaic power generation system, the external conditions such as light intensity and temperature change will cause the output power fluctuation of photovoltaic power generation, which will easily lead to the instability of the system, and need to be stabilized by the energy storage system. Based on this, a hybrid energy storage photovoltaic power generation system is studied in order to stabilize the power fluctuation and improve the power quality. In this paper, the working principle of photovoltaic cell is analyzed, and the characteristic curve of photovoltaic cell is obtained by simulation experiment. In order to maximize the power utilization, a variable step size maximum power tracking method is studied. Compared with the traditional maximum power tracking method, the tracking effect is faster and more accurate. Then the energy storage system is further studied, several energy storage methods are compared, the hybrid energy storage structure based on storage battery and super capacitor is studied, and the simulation model is built by using the SimElectronics component library in Simulink, compared with the SimPowerSystems component library. The model is closer to reality and the simulation results are more accurate. Finally, in the aspect of control strategy, a kind of converter which can realize bidirectional energy flow is studied. By using PWM to control the power fluctuation, the stability and smoothness of output voltage can be guaranteed. Based on the above research, the whole simulation model of photovoltaic power generation system is built, and the voltage waveform of the system is obtained by the simulation experiment aiming at the variation of illumination intensity and load. The effectiveness of the proposed technique is verified by analyzing the voltage harmonic content.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TM615
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