Research and Design of Conditioning Units for Wireless Energy Harvesting Device in Smart Grid

Abstract

With the rapid development of Chinese power industry, the wireless sensor technology has become an important part of realizing the intelligent construction of the power grid. However, the problem, that how to convert the energy collected by wireless storage device into stable DC output for wireless sensors, has limited the large-scale of wireless sensor. Therefore, it is an urgent need to design conditioning units for wireless energy harvesting device. According to the actual situation of the substation and the lower efficiency of traditional energy harvesting device, this research has proposed a new type of spherical capacitive energy converters topology, and designed energy collected and accelerated circuit and the PWM double-loop controlling and conditioning circuit with rectifier, storage and voltage regulation function. Besides that, the main parameters have been determined by theoretical calculation, and the conditioning circuit is simulated by PSIM simulation software. The simulation results verify the effectiveness of the mentioned topology and parameter selection method.Keywords: wireless sensor, conditioning unit, energy collected and accelerated circuit, isolated fly-back conditioning circuit. INTRODUCTIONAdvanced sensing and measurement technology is required to accomplish the normal operation of intelligent monitoring and diagnosis in smart grid. However, the energy supply problem has become the main barrier which hinders it to further develop. The high voltage substation and transmission line in the power grid are rich in electromagnetic energy [1]. Thus, it is necessary to develop a wireless energy harvesting device that can collect stray energy in the surrounding environment of a substation, and a conditioning unit that converts the collected power to DC power for wireless sensor. The energy collection unit converts the spatial electromagnetic energy in the substation into electric energy. In this article, a new type of spherical capacitive energy converter topology is proposed to collect the electric field _______________________