基于改进Logistic模型阶段划分理论的饱和负荷预测

用电需求的饱和负荷预测可以确定一个地区未来电网发展与用电需求的最终规模,并以其远期电网规划目标指导近期电网建设,可以有效减少电网改造成本,做到有步骤有条理地进行该地区区域电网的改造与建设,对区域规划、区域经济与电网之间的协调发展具有重要意义。该文提出了基于改进Logistic模型的负荷发展历程阶段划分理论,并给出了饱和负荷的新内涵,修正与完善了判定电力饱和负荷的量化指标体系。最后采用改进Logistic模型对案例进行了研究与分析,完成了案例用电饱和规模以及饱和时间点的预测与分析工作,并验证了其可行性。     

Second Discharge Characteristics of Aluminum Wire Electrical Explosion Under Various Argon Pressures

Electrical wire explosion is a promising method for the preparation of metal nanopowder, but the properties of metal nanopowder are affected by the second discharge process of electrical wire explosion. The second discharge characteristics of aluminum wire electrical ex- plosion under variant argon pressures were studied in a RLC discharge circuit. The results show that the curve of the second discharge voltages versus the pressure presents a U-shape. To clarify the roles of aluminum vapor and argon in the process of the second discharge, a spectrograph and a high speed framing camera were used to study the radiation spectrum and spatial distribution of the electrical explosion plasma. It is observed that argon participates in the second discharge process under low pressure. A discharge channel develops along the surface of the aluminum vapor. Under higher pressure, a second discharge takes place in the aluminum vapor and the discharge channel is inside the aluminum vapor.