中文摘要：

与同步发电机相比,逆变型新能源电源在运行机理、控制方式和并网拓扑结构方面均有较大区别,故障下其电磁暂态特性研究仍不够深入。在改进直流侧卸荷电路投切控制策略的基础上,建立了综合考虑典型并网控制和低电压穿越控制的逆变电源电磁暂态模型,从理论定性和定量分析2个角度,揭示了该电源在故障发生、切除全过程中的暂态特性,并深入讨论了故障位置、电源本体输入功率及接入台数、无功功率注入量以及所接电网短路容量等因素对逆变电源故障暂态特性的影响规律。这将为大量新能源电源接入电网后现有保护适应性分析及其新原理研究提供理论参考。

英文摘要：

As compared with the traditional synchronous generators, the inverter-interfaced renewable energy sources are different in the electricity generation principles, the integration topology and the control mode, which make their fault behaviors change a lot. To reveal the fault characteristics of the inverter-interfaced renewable energy sources with fault ride-through capability, the integration control strategy was outlined and the low voltage ride through （LVRT） control scheme for the DC-side crowbar was improved. On the basis of this, the detailed electromagnetic model was built. The fault characteristics of the sources were systematically clarified for the entire period from the occurrence of the faults to its clearance from the perspectives of theoretical qualitative and quantitative analysis. Moreover, the main impact factors were discussed, such as fault location, the input active power and the rated capacity of the sources, the reactive power delivered to grid, and the short-circuit capacity of the power grid, etc.