Abstract
The harmonics produced by the voltage source converters (VSCs) will be a challengeable power quality problem in modern power system. The digital simulation is an important approach to analyze the harmonic problems of the power electronic devices. The time step of simulation is the key point which affects the accuracy of the harmonic analysis of discrete signals in the digital simulations. This paper studies the impact of the time step on the harmonic analysis results in digital simulations of VSCs. Firstly, the difference between the discrete and continuous PWM signal is analyzed. Secondly, the magnitudes of the low order harmonics of discrete signal are calculated with double Fourier transformation. The errors between the discrete and continuous signals are relative with simulation time step. Finally, in order to improve the accuracy of the harmonic analysis, this paper presents two principles of the selection of the time step with consideration of spectral leakage and the difference between discrete and continuous signals. The upper limit of the time step is deduced theoretically. The simulation results with different time steps show that the principles are correct, which are instructive for improving the accuracy of the harmonic analysis with digital simulation.
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