Influence of grid-connected distributed power sources with different penetration rates on residual current of human body electric shock

Abstract

In recent years, new energy power generation and distributed power supply have been widely used, and smart grid technology has also developed rapidly. The introduction of DC power supply has a great impact on the previous current waveform; the residual current waveform after the organism is electrocuted will also occur. Variety. The change of the power supply system will bring new challenges to the residual current protection after the living body is electrocuted. The research object of this paper is the simulation model of the AC-DC hybrid microgrid power supply system, and the biological equivalent impedance is connected through a certain AC-DC topology structure. The part as the power supply system includes the ordinary three-phase power supply system as the AC power supply and the photovoltaic system and the energy storage system as the DC power supply. Taking the organism as the experimental object, the electric shock experiment was carried out and the electric shock waveform and the residual current waveform were obtained. Secondly, the characteristics of the waveform are analyzed and studied by mathematical methods such as fast Fourier transform. The research tools of this paper are Matlab and the simulation software Simulink, which are used for modeling and simulation to study the characteristics of electric shock current.