The global warming of the planet is as a result of human activities. Fossil fuel depletion and its high prices have caused a worldwide economic instability; governments around the world turn to alternative energy sources that are pollution-free. Solar photovoltaic system is one of the biggest renewable energy resources to generate electrical power and the fastest growing power generation in the world. The objectives of this work are: to ensure the maximum power point tracking (MPPT) in the side of the PV panels, to ensure the DC–DC boost converter boosts DC voltage by using the MPPT algorithm and pulse width modulation (PWM) technique, to invert the boosted DC voltage to three-phase AC voltages by using sine PWM technique to five-level VSI, to synchronize the PV-generated power to the grid power aided by the synchronous reference frame (SRF) controller. The step of modelling the photovoltaic system with MATLAB/Simulink was performed with RL-load and L-load and %THD got through FFT analysis. The results show that the DC voltage generated by the PVA produces an AC current sinusoidal at the output of the inverter. The contribution of the PV system to the grid consequently reduces the power fluctuation of the grid.

中文翻译：

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三相并网光伏系统建模与分析

地球的全球变暖是人类活动的结果。化石燃料的枯竭及其高昂的价格导致了世界范围内的经济不稳定；世界各国政府转向无污染的替代能源。太阳能光伏系统是世界上发电量最大的可再生能源之一，也是发电量增长最快的系统之一。这项工作的目标是：确保光伏电池板侧面的最大功率点跟踪（MPPT），通过使用 MPPT 算法和脉冲宽度调制（PWM）技术确保 DC-DC 升压转换器提升直流电压，利用正弦PWM技术将升压后的直流电压逆变为三相交流电压，形成五电平VSI，在同步参考系 (SRF) 控制器的帮助下将光伏发电与电网同步。使用 MATLAB/Simulink 对光伏系统进行建模的步骤是使用 RL 负载和 L 负载执行的，并通过 FFT 分析得到 %THD。结果表明，PVA产生的直流电压在逆变器的输出端产生正弦交流电流。光伏系统对电网的贡献因此减少了电网的功率波动。