With the deepening of the electricity market reform and the development of community economy, as well as the increasing of grid scale, researching and establishing the adaptability evaluation theory and method of power grid construction not only is a realistic demand, but also has great influence on improving the evaluation theory system of power grid planning. In this paper, the adaptability evaluation content for large power grid construction consists of the adaptability of the national economy, the energy structure adaptability, grid structure adaptability and the adaptability of technology development. The paper also discusses the constructing theory and practice basis of the evaluation contents, in addition, the evaluation indexes of adaptability are presented in the paper.
Congestion management is a hot point for research in power system. Optimal power flow (OPF) model is often used to solve this problem. However, the results cannot satisfy with market needing. To solve this problem, this paper presents a novel method of congestion management based on risk constraint and fuzzy optimization in electricity power markets. The risk constraint is used for transmission line thermal security instead of the traditional deterministic current or power constraint. The multi-objective functions are used to coordinate the conflict between security and efficiency of transmission network. Primal-Dual Interior Point Method (PDIPM) is adopted to solve the RBOPF problem. The method can minimize re-dispatch cost and the system operating risk.
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In this paper, I designed a differential planetary gear for flip climbing transmission system which was applied to the star-climbing wheelchair. According to space limitation and the stair climbing per
formance requirements, distributing the number of teeth for each gear under transmission ratio requirements. Furthermore, modifying tooth profile parameters on each gear for improving the quality of the transmission. Using SolidWorks software established
t
he three-dimensional model. Then impact and contact simulated analysis is studied based on the SolidWorks Motion Plugins to get transmission and meshing condition. At the same time, gave the SolidWorks Motion output data as a result of the input data to t
h
e SolidWorks Simulation. Through the simulation results validate the output center gear tooth can meet the carrying capacity requirements. On the other hand, it also provides theoretical basis for further improve the structure design.
In the view of the safe and stable operation of power system in the extreme environments, the status and the role of two typical provincial power systems in China were analyzed. Combined with the spatial and temporal distribution characteristics of this total solar eclipse in July 22, the operations of the two provincial power systems in different regions during the total solar eclipse were compared. The main impacts of the development process of the total solar eclipse on power systems were analyzed. At last, combined the development trend of the extreme environments in the world, how to reduce the running risk of power system in the extreme environments by the crisis dispatch was explored.
Voltage is a key factor not only to power system but also to user. Keep voltage steady is a hot point for researching. Paper proposed keeping steady voltage and improving power quality by using intelligent auto voltage control system. This method is based on the existing power system software and hardware platforms. It is of the advantages of mature technology, small investment, and can improve user’s power quality effectively. Second, the application of auto voltage control on textile manufacture is analyzed. It can improve running environment of textile devices and textile quality
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