Abstract: Multi-energy complementary generation operation had become a new direction to improve the

efficiency of new energy utilization，and it is particularly important to analyze the characteristics of multi-energy

complementary generation. According to the operation characteristics of multi-energy complementary generation

system，combined with the evaluation index of complementary generation and the benefit of combined generation，an operation index system for evaluating complementary characteristics of microgrid was established. Based on this index system，the wind-solar-water-storage complementary power generation system was analyzed from three aspects：reliability，stability and economy. The results show that the wind-solar-water-storage complementary operation system can realize the complementarity of wind，light and water in the intra-day time scale，and greatly improve the stability of power supply and the utilization rate of renewable resources.

      Key words: microgrid；multi-energy complementary power generation； complementary characteristics；

intraday time scale；evaluation index