Study on the superposition of multi-harmonic sources in electrified railway traction substations

The harmonic current generated by electrified railway traction substation has stochastic volatility. Aiming at the superposition of multi-harmonic sources caused by electrified railway traction substations in a certain area, this paper establishes the harmonic sources model of electrified railway traction substation, and calculates to superpose harmonic sources with random amplitude and phase angle by the national standard method and Monte Carlo method in MATLAB. Then built the power grid model of the area to verify the above methods based on ETAP simulation software. The results show that Monte Carlo method has less calculation error in calculating random harmonic sources and is more suitable for evaluating the superposition of multi-harmonic sources in electrified railway traction substations.