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随着半导体开关器件的快速发展,其在电力电子产品中的应用也越来越多,开关频率的升高和开关的开通与关断导致了严重的电磁干扰问题。在光伏逆变系统中,其自身的电磁干扰问题日益成为一个主要的制约因素。电磁干扰检测是产品投产前的最后一个关键步骤,因此其重要性不可忽略。对光伏逆变系统进行了建模,并对该系统中共模干扰的路径进行了完整的分析。基于阻抗不平衡原则给出了直流侧EMI滤波器设计过程。分别对4种常用的滤波器拓扑进行研究分析,并在光伏逆变器的直流侧分别加入这4种类型的滤波器,得到与之对应的仿真结果和实验结果,验证了理论分析的正确性。
With the rapid development of semiconductor switching devices, their applications in power electronic products are also more and more. The rise of switching frequency and the opening and closing of switches lead to serious electromagnetic interference problems. In the photovoltaic inverter system, its own problem of electromagnetic interference is increasingly becoming a major constraint. Electromagnetic interference detection is the product before the last key step, so its importance can not be ignored. The photovoltaic inverter system is modeled, and the path of common mode interference in the system is analyzed completely. Based on the principle of impedance imbalance, the design process of DC side EMI filter is given. Four commonly used filter topologies were studied and analyzed respectively. The four types of filters were added to the DC side of the PV inverter respectively. Simulation results and experimental results were obtained and the correctness of the theoretical analysis was verified .