The dc boosting and integration system has been increasingly used in photovoltaic power plants due to its flexible control and excellent performance. The dc boosting and integration system has complex topology and many photovoltaic branches. Because power electronic devices cannot withstand large fault currents, protection with fast operating speed is required. Thus, the starting element has to start quickly and sensitively, and the protective relays must identify the faulty section correctly based on the instantaneous value of the distorted transient fault current. Considering these, the conventional protection carries great potential for disoperation; therefore, a novel active protection is proposed. The starting elements start more sensitively, and the faulty region is correctly distinguished through identifying the fault information generated by active control. The effective fault information is derived from distorted transient instantaneous current data through the fuzzy logic algorithm. Simulation results reveal that the proposed protection can accurately operate within 1 ms when noise is up to 20 dB and transition resistance is up to 500 Ω.

中文翻译：

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基于模糊逻辑的光伏直流有源保护

直流升压一体化系统以其控制灵活、性​​能优良等优点，越来越多地应用于光伏电站。直流升压集成系统拓扑复杂，光伏支路多。由于电力电子设备不能承受大的故障电流，因此需要运行速度快的保护。因此，启动元件必须快速灵敏地启动，保护继电器必须根据失真的瞬态故障电流的瞬时值正确识别故障段。考虑到这些，常规保护具有很大的故障潜力；因此，提出了一种新型的主动保护。起始元素开始更敏感，通过识别主动控制产生的故障信息，正确区分故障区域。有效的故障信息是通过模糊逻辑算法从失真的瞬态瞬时电流数据中推导出来的。仿真结果表明，当噪声高达 20 dB 且过渡电阻高达 500 Ω 时，所提出的保护可以在 1 ms 内准确运行。