Modelling and Analysis of Electric Shock Simulation for Hybrid Power Supply System

Abstract:
With the increase of new energy power generation and distributed power generation and the development of smart grid technology, the addition of DC power supply will affect the waveform of the generated residual current, which is a composite signal superimposed by various AC and DC waveform. At this time, the traditional residual current circuit breaker has been unable to accurately protect the residual current, and can not meet the requirements of electricity safety. Therefore, the AC and DC residual current waveform bring new challenges to the residual current protection technology. Firstly, the low-voltage AC-DC power supply system is modelled, and the overall models of photovoltaic, energy storage, interface converter and AC-DC power supply system are established respectively. Secondly, the multi-port impedance circuit model of biological electric shock is designed and the simulation of biological electric shock under the AC-DC hybrid power supply system is carried out to obtain experimental data. Finally, based on fast Fourier transform, the spectral characteristics and waveform characteristics of residual current transient signal are analysed. Based on the simulation results of residual current protection of living body electric shock in AC and DC power supply system, this paper uses fast Fourier transform to analyze waveform and spectrum, and studies the variation law of waveform amplitude and phase of living body electric shock data. Design provides the basis.