Abstract In this paper, a small hydropower microgrid solution with high applicability is proposed to solve the problem of high line failure rate and long maintenance time, which can improve the reliability of distribution network in mountainous areas. In this scheme, small hydropower and local load constitute a low-cost but efficient microgrid operation to improve the reliability of rural electricity. In this scheme, small-sized hydropower and local load constitute microgrid operation. In case of failure, the scheme makes full use of the independent operation of microgrid to provide qualified power quality to local load. This scheme is easy to realize and does not need additional energy storage, so it has good economy. Firstly, the frequency disturbance characteristics of small hydropower microgrid is analyzed, which lays a theoretical foundation for small hydropower microgrid operation. Then it introduces the island operation mode to grid-connected operation mode transition of small hydropower, including the key technologies such as frequency adjustment strategy in island operation stage. Finally, the simulation studies show the effectiveness of the method.

中文翻译：

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适用性强的小水电微网运行策略及控制技术

摘要 为解决线路故障率高、维护时间长的问题，提出了一种适用性强的小水电微网解决方案，可提高山区配电网的可靠性。在该方案中，小水电和当地负荷构成低成本但高效的微电网运行，以提高农村电力的可靠性。在该方案中，小水电和本地负荷构成微电网运行。在发生故障时，该方案充分利用微电网的独立运行，为当地负荷提供合格的电能质量。该方案易于实现，不需要额外的储能，因此具有较好的经济性。首先分析了小水电微电网的频率扰动特性，为小水电微网运行奠定了理论基础。然后介绍了小水电孤岛运行模式向并网运行模式的转变，包括孤岛运行阶段的调频策略等关键技术。最后，仿真研究表明了该方法的有效性。