Abstract.The distributed generation which is integrated in the active distribution network changes power flow, bringing new challenges to the voltage control. When voltage limit violation happens, in order to make the voltage return to normal range and improve the voltage quality, a novel voltage control strategy is proposed. Considering the voltage quality and node importance, the electrical closeness centrality and key node contribution degree are defined, and the key nodes are determined by the orders of the key node contribution degree. This paper uses the reactive power compensation devices which are installed at the key nodes coordinated with the reactive power output of the distributed generation to realize the voltage optimization control. The voltage optimization control model is established by taking the minimum power loss as an objective function. Using the particle swarm optimization algorithm solves the model. The simulation results of the improved IEEE-33 bus system verify the effectiveness of the proposed method.
This article is based on the practical engineering need of expressway .Study about the mechanical properties of phyllite filler, and then improve the property by using the cement. Testing the original rock phyllite minerals analysis experiment, uniaxial compressive strength test and physical parameters of phyllite filling test and water disintegration test and analysis. After that we make test about different gradation of the cement improved phyllite packing compaction test and unconfined compressive strength test, analyzed the change characteristics of modified phyllite filler engineering, comprehensive analysis and selection of cement admixture is 3%, content of coarse aggregate gradation is 55%.This is the best combination to meet the requirements of economy and the mechanical properties.
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