2020-2021年冬季京津唐电网负荷与气温之间的关系研究

冬季空调器、电采暖等供暖设备的使用率逐步提高,京津唐电网负荷受气温的影响也愈发明显,并在2021年1月6日的极寒天气影响下创历史新高.为了解气温对京津唐电网负荷的影响,并且准确预测次日负荷大小,首先对京津唐电网日最大(小)负荷与日最低(高)气温进行相关性分析;其次,建立负荷与气温的线性回归模型,分析京津唐地区负荷对气温...     

Performance and Stability of Supercapacitor Modules based on Porous Carbon Electrodes in Hybrid Powertrain

Hybrid power sources have attracted much attention in the electric vehicle area. Particularly, electric-electric hybrid powertrain system consisting of supercapacitor modules and lithium-ion batteries has been widely applied because of the high power density of supercapacitors. In this study, we design a hybrid powertrain system containing two porous carbon electrode-based supercapacitor modules in parallel and one lithium ion battery pack. With the construction of the testing station, the performance and stability of the used supercapacitor modules are investigated in correlation with the structure of the supercapacitor and the nature of the electrode materials applied. It has been shown that the responding time for voltage vibration from 20 V to 48.5 V during charging or discharging process decreases from about 490 s to 94 s with the increase in applied current from 20 A to 100 A. The capacitance of the capacitor modules is nearly independent on the applied current. With the designed setup, the energy efficiency can reach as high as 0.99. The results described here provide a guidance for material selection of supercapacitors and optimized controlling strategy for hybrid power system applied in electric vehicles.