Purpose of the work is improved approaches to ensure the required quality parameters of voltage in the traction network based on modern technologies and equipment in the application of power distribution system. Actuality. The introduction of high-speed traffic, increase weight standards Train necessitates increasing the carrying capacity of railways. Often the carrying capacity of existing sections electrified at 3.0 kV DC power supply unit limits. Such limitations include voltage decrease on the electric current collector below the allowable value for the normal operation of 2700 (2900 for high-speed V) and heating the contact wires, thereby losing their mechanical strength. Existing power supply system of RS, which have considerable installed traction substations, can not provide the required level of power density traction network for high-speed movement within 1.5 - 2 MW / km and, respectively, the required voltage quality. At the same time, the daily loading of a powerful traction substations in providing intensive schedule of trains does not exceed 20-25%, while the energy loss in traction network peak load increases and reaches 10-15% of the energy consumed. Thus, the existing system of power traction networks is not sufficiently effective and economical, even with the application of existing methods to strengthen them. In our view, the main limiting factor for a given quality of voltage in the traction network is the use of centralized power. From this, the development of measures to improve the quality of voltage in the traction network in the implementation of high-speed traffic in a growing scarcity of energy resources is an urgent task. Scientific novelty. Using distributed power supply system with adjustable supply points combined into intelligent power supply, which enables adaptive change the characteristics of the transfer, conversion and consumption and optimize the mode of functioning of the traction power supply is suggested for improving the quality of voltage in the traction network in the implementation of high-speed and heavy traffic. Practical significance. Improving the quality of voltage in the traction network by using the proposed circuit design traction power supply will ensure the desired mode voltage and power characteristics of the traction network in the implementation of high-speed and heavy traffic while reducing electricity losses by 20-30%.
The article proposes an approach to the simulation of parallel operation of external power supply system and AC traction power supply system in unbalanced conditions which based on separated phase representation of three-phase electric networks. Using this approach allows to take into account various configuration of traction substation connection to external power supply system, nonlinear transformer parameters with the use of approximation the magnetic permeability by function from magnetic field strength and nonlinear parameters of traction load by using active and exchange characteristics of AC electric locomotives. Analytic expressions for determining parameters of evaluation system help formulate mathematical model in the normal form of differential equation system. Using this method, various complex mathematical models can be created, because every block are described with the typical equations. Parallel simulation of external and traction power supply system allows to calculate and analyze the power quality indices, perform research focused on power system checking while new equipment or new technical decision provides in steady-state and transient modes. References 29, figures 6, tables 2.
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The paper conducted research to reduce the cost of electricity for traction power in the wholesale electricity market. Our calculations show that the previously known criteria for evaluating energy consumption in the market conditions are irrelevant.
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