Development and design of a power  supply system for intelligent  monitoring equipment in smart grids

Authors

Hongguang Zhang School of Automation and Information Engineering, Xi’an University of Technology, No. 5 South Jinhua Road, Xi’an,710048, Shaanxi, China, Author
Jiandong Duan School of Automation and Information Engineering, Xi’an University of Technology, No. 5 South Jinhua Road, Xi’an,710048, Shaanxi, China Author
Quan Quan Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, No. 5 South Jinhua Road, Xi’an, 710048, Shaanxi, China Author
Bing Ye School of Automation and Information Engineering, Xi’an University of Technology, No. 5 South Jinhua Road, Xi’an,710048, Shaanxi, China Author
Yi Teng School of Automation and Information Engineering, Xi’an University of Technology, No. 5 South Jinhua Road, Xi’an,710048, Shaanxi, China, Author

Smart grids, Electromagnetic induction, Tapoff power, Intelligent monitoring equipment.

In recent years, a variety of distributed intelligent moni

toring equipment has been installed in smart grids, and this

equipment often requires low-power DC supply. This paper

examines a power supply system which is used by distributed

intelligent monitoring equipment in smart grids. The power

supply system taps-off low-power from the transmission line

or bus bar through the Faraday electromagnetic induction

principle. First, the induction coil through which the transmis

sion line or bus bar pass obtains low AC power, then AC volt

age is rectified and filtered to a DC voltage which is converted

into 5V by a DC/DC converter. A lithium battery (LB) was

used as a standby power module to solve the dead zone of the

induction coil. Finally, a power management module based on

the STC15F2K60S single chip was able to switch between the

energy of the induction coil and standby module by monitor

ing battery voltage and output voltage, so that output voltage

and current can supply the intelligent monitoring equipment.

Experiments indicated that this power supply system could

stably supply 5W power in 5V when the current of the trans

mission line or the bus bar is in the range of 0~1000A.