Abstract
It has been well recognized that the methods for electrical load modeling have significant impacts on the power systems operation, simulation, analysis and security assessment. Compared with the power grid of infinite capacity, the equipment power system with a large number of power electronic devices has larger internal resistance, and the application objects of the model face to the three-phase four-wire independent power supply system. Therefore, this paper deals with the problem of the three-phase four-wire harmonic load modeling in the equipment power system of infinite capacity, including the basic idea and principle of nonlinear load design, the main circuit structure of the chosen four-leg PWM converter, and the overall control strategy. Based on FFT analysis comparison between the real measured data and the simulation data, it is further shown that the load model can reproduce accurately the current waveform distortion, and simulate the harmonic characteristics of the steady state and transient state of equipment power system.
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