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Aimed at the impact of extreme weather on the stable operation of microgrid, an optimal configuration strategy of microgrid based on fuzzy scene clustering is proposed. Using historical weather data, a fuzzy scene clustering method is used to deal with the problem of new energy output fluctuations caused by random weather on the source side, and a robust optimization model is established on the load side to deal with load fluctuations within a certain range. Using scenes of 8 760 hours in a year, typical scenes and extreme scenes are obtained by distinguishing the unique membership characteristics of fuzzy scene clusters. Considering the impact of extreme scenarios on the optimal configuration of the microgrid, a two-stage robust model with the smallest comprehensive cost is established, which is decomposed by the column and constraint method, and is finally solved iteratively by Cplex solver. The effectiveness and feasibility of the proposed optimal configuration strategy are verified by simulation analysis.

In order to solve problems of self-compacting mortar used in the ballastless track slab of the urban rail transit, including high technical requirements, strict construction process, difficult of pouring quality control and expensive price, a new self-filling concrete technology was researched based on the mature highspeed rail self-compacting concrete technology. Influences of mineral admixtures and admixtures on the rheological properties, mechanical properties such as compression resistance, flexural resistance and elastic modulus of self-filling concrete were carried out by the mixing test. The performance indicators of self-filling concrete were verified by poured and uncovered concrete tests. The research shows that: fly ash can improve the fluidity of the new self-filling concrete. A certain degree of bleeding and the cohesion will become worse when the content of fly ash is more than 40%; The slump expansion reaches the maximum when the content of slag powder is 20%, and then decreases gradually; The compressive strength and flexural strength decrease gradually with the increase of the content of fly ash and mineral powder, but have little effect on the elastic model; The change of the content of water reducer agent has little effect on the compressive strength; and the self-filling concrete meets the requirements of various performance indicators finally, and the cost is reduced by more than 20%. [ABSTRACT FROM AUTHOR]