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As the rapid development of electrified railway, the proportion of traction loads in the power system is increasing, which imposes some hazardous effect to power system stability. Power system simulation is believed as an indispensable tool for power system planning, design, operation, research etc. Therefore, it is a important factor of research on the influence of traction loads to power system, which is how to construct the load model accurately reflecting the synthesis load characteristics of traction loads. To settle the time-variation problem of traction load in measurement-based load modeling, this paper uses the method of classification and synthesis for dynamic load characteristics. A novel improved load model is introduced based on the actual load structure of the traction power supply system. By the parameters identification, this paper provides recommended parameters of several different traction conditions. The results of a instance verify the improved description of measured data and the effectiveness and rationality of the method of the classification and synthesis. This paper provides the foundation of the research on the influence of traction loads to power system and putting forward corresponding measures.

Owing to the characteristics of nonlinearity, asymmetry and stochastic volatility, electrified railway traction loads have arose some hazardous effects to security and stability, reactive power compensation and voltage control, power supply quality of power system. It has practical significance to research on the influence of traction loads to power system for ensuring security and stability of power system. By using Power System Analysis Software Package/User Program Interface (PSASP/UPI) function, the electrified railway traction measurement-based load model (traction load model, TLM) for transient stability simulation are established, and then the TLM is applied to Hunan Electrical Power Network. The dynamic characteristics of TLM and the difference characteristics between TLM and the traditional load model are analyzed through setting different faults. The paper provides a convenient reference for further research on the relay protection setting calculation of power system and safety controlling strategies of traction power supply system.