In this study, the hot deformation of a Cu–0.55Sn–0.08La (wt.%) alloy was studied using a Gleeble-3180 testing machine at deformation temperatures of 400–700 °C and various strain rates. The stress–strain curve showed that the hot deformation behavior of the Cu–0.55Sn–0.08La (wt.%) alloy was significantly affected by work hardening, dynamic recovery, and dynamic recrystallization. The activation energy Q was 261.649 kJ·mol−1 and hot compression constitutive equation was determined as ε=sinh0.00651σ10.2378∙exp33.6656-261.649RT. The microstructural evolution of the alloy during deformation at 400 °C revealed the presence of both slip and shear bands in the grains. At 700 °C, dynamic recrystallization grains were observed, but recrystallization was incomplete. In summary, these results provide the theoretical basis for the continuous extrusion process of alloys with promising application prospects in the future.
Combined with actual situation of Fengxian power Supply Company, the neutral grounding modes of Fengxian 35 kV and 10 kV power grid are studied in the paper. The different frequencies injected method is used to measure the capacitive current of Fengxian 28 substations, and the neutral grounding modes of the 28 substations are determined based on the measured values of capacitive current.
Solar photovoltaic (PV) has been developed rapidly due to its clean and green renewable characteristics. The connection of photovoltaic power generation to the traditional grid system is bound to bring power quality problems. Based on above, this paper introduces the power quality testing method of photovoltaic grid-connected power grid in detail. And then takes the Shanghai Qingpu Nanrong distributed photovoltaic power generation for example, which is the largest single roof photovoltaic power station in Shanghai by far, to use the method to test its power quality. The power quality index include harmonic, voltage imbalance, and frequency deviation. The test and analysis provide a reference for the monitoring and analysis of power quality of photovoltaic grid-connected power grid.
Facing the rapid development of renewable energy which is represented by wind and photovoltaic power generation, the installed capacity of renewable energy in the power system is increasing with each passing day. While the proportion of wind and photovoltaic power in the total installed power supply of the system is small, the power system is able to fully accept wind power and photovoltaic grid-connected power generation; However, when wind power and photovoltaic reach a certain scale, the intermittency and volatility of their output make their influence on the system not negligible, so it is necessary to study the acceptance capacity of renewable energy. In this paper, based on many innovative energy sources which are connected to the power grid in a certain region, the corresponding model is established, and the risk analysis of different innovative energy links correlating with the power grid and the optimization operation research are carried out.
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