Background. The problem of this work is to optimize the currently used methods for calculating the available bandwidth based on analytical calculations by building a simulation model in the AnyLogic software package. Most scientists are working on the issues of laying the traffic schedule without taking into account the complex of issues related to predictive modeling and improving the accuracy of calculating the available capacity. Materials and/or methods: simulation modeling, economic and mathematical modeling, AnyLogic software package, methods of general systems theory, logistics. Results. In the course of the work, an abstract model of a railway line was developed and built that simulates the movement of trains according to the specified traffic parameters. The results of the study can be used in the dispatching centers of transportation management of JSC “Russian Railways” in order to optimize the analysis of the subject of the completed work of the railway landfill of the road. Conclusion. The paper considers and proposes a method for calculating the available capacity on a railway line based on existing analytical formulas and the use of simulation modeling tools in order to adjust them and calculate the value of the simulation modeling coefficient proposed in the work.

The object of the work is the projected traffic-transfer hub (TTH) in the area of station B. Based on the passenger flows between all modes of transport present in the transport hub, the parameters of service devices are determined by simulation modeling. The obtained data will allow organizing the necessary capacity of the hub during "peak hours", at the same time during the period of decreasing passenger traffic flow there will be no significant idle time of the passenger devices. Based on the data obtained, technical and economic comparison of options for equipping the transport hub with service devices was made, as a outcome of which the most optimal number of devices was identified.

Background. The problem of this work is to develop a methodology for calculating cash throughput, which is based on the well-known formulas for calculating cash throughput, the main innovation of which is to take into account the time spent by trains on acceleration and deceleration en route. Currently, in the process of calculating the available capacity, a formal approach is used to determine the removal coefficients, and the site speed is also taken into account, calculated taking into account acceleration and deceleration, but representing only the ratio of the length of a certain section of the railway polygon to the time of the train following it. Materials and/or methods: simulation modeling, economic and mathematical modeling, AnyLogic software package, methods of general systems theory, logistics. Results. An analytical formula is proposed that allows calculating the available throughput with higher accuracy. The results of the study can be used in the dispatch centers of transportation management of JSC “Russian Railways” in order to more fully analyze the operation of the landfill of the road, railway lines or individual sections in order to more fully analyze the work performed on transportation. Conclusion. The article develops a methodology for calculating the available capacity on a railway line with full consideration of the effect of acceleration and braking of trains on their way to the resulting available capacity.

This paper considers methods of determining the capacity of railway lines with mixed traffic. This issue is relevant, since the calculation with the help of standard analytical formulas often does not correspond to the actual existing capacity of the railway line. In connection with this circumstance, the paper considers the method of calculating the capacity of the railway line using simulation modeling, the results of which are closer to the real values of the available capacity.

Currently, Vietnam‘s energy source structure is being changed by which renewable energy sources play more important role to meet the electricity demand and reduce greenhouse gas emissions from fossil energy sources. Vietnam’s energy development strategy determines to build some renewable energy centers, of which Ninh Thuan is the first province designated to become a national renewable energy center. This is based on Ninh Thuan’s endowment as a province having the largest renewable energy potential in Vietnam. Development of a large renewable energy center allows power system planners to overcome the mismatch in timescales associated with developing transmission power grid and renewable energy generation. Besides, renewable energy center can facilitate a significant pipeline of large-scale renewable energy and storage projects. However, Ninh Thuan province is far away from the major load centers of Vietnam so the calculation and analysis of economic indicators need to be studied. This paper will present the results of the analysis of economic indicators of major renewable electricity sources in Ninh Thuan (onshore wind power, offshore wind power, solar power) to provide scientific arguments for developing a renewable energy center in Vietnam. Also the paper addresses the problem of the large-scale penetration of renewable energy into the power system of Vietnam. The proposed approach presents the optimization of operational decisions in different power generation technologies as a Markov decision process. It uses a stochastic base model that optimizes a deterministic lookahead model. The first model applies the stochastic search to optimize the operation of power sources. The second model captures hourly variations of renewable energy over a year. The approach helps to find the optimal generation configuration under different market conditions.