scholarly journals Algorithm of calculation and forecasting of functional safety indicators of railway power supply systems

Dependability ◽  
2018 ◽  
Vol 18 (3) ◽  
pp. 46-55 ◽  
Author(s):  
O. B. Pronevich ◽  
V. E. Shved
Keyword(s):  
Risk Management ◽  
Power Supply ◽  
Power Supply System ◽  
Complex Structure ◽  
Supply System ◽  
System Structure ◽  
Functional Safety ◽  
Railway Transportation ◽  
Transportation Management ◽  
Supply Systems

Acknowledgement: the authors express their personal gratitude to Prof. Igor B. Shubinsky, Doctor of Engineering, for his recommendations regarding the choice of the theoretical background that provided the foundation for the practical research, as well as hisadvice and valuable observations that contributed to this paper.Abstract. Aim. Uninterrupted transportation process is ensured by the highly dependable and safe power supply system of railway transport. In addition, the railway power supply system provides power to external consumers. A risk-oriented approach to railway transportation management requires an infrastructure risk management and safety system. The main purpose of risk management in this area is to improve the dependability and safety of railway infrastructure facilities [1, 2]. Additionally, given the growing numbers of intelligent information systems, as well as automated railway transportation management systems, the task of ensuring functional safety becomes very important. In most cases this problem is solved by introducing redundancy that is understood as an exceeding complexity of the system structure compared to the minimal values required for the performance of the specified task [3]. The simplest way of ensuring redundancy is by creating backup capabilities, particularly standby duplication within the system of functional units and components. In order to evaluate the safety of the railway transportation power supply systems it is required to calculate the functional safety indicators of their components and system as a whole taking into account the factor of redundancy. This approach will enable the optimal redundancy architectures and ensure compliance with the assigned level of general system safety. That requires taking into consideration the complex structure of the evaluated facilities: presence of diagnostics systems, right-side failures, wrong-side failures, as well as their random nature. The paper aims to develop an applied algorithm of calculation and prediction of functional safety indicators using the example of railway power supply systems that can be used in both manual and automated calculation.Methods. The power supply system evaluated for functional safety indicators is, from the functional point of view, a sequence of function implementations, while the failures of its components are random and some of them cause hazardous events. In this case, system analysis commonly involves Markovian and semi-Markovian methods, as well as graph methods. The advantage of these methods consists in the capability to evaluate the functional safety indicators of complex systems that go into many states, which is also typical for railway power supply systems.Result. This paper examines the application of graph semiMarkovian methods for calculation of stationary and non-stationary functional safety indicators for components of power supply systems taking into account redundancy and right-side failures. This algorithm allows calculating safety indicators using the example of power supply systems and includes a set of incremental actions aimed at constructing the state graph, calculation of the initial and intermediate graph factors. An example is provided of calculation of the functional safety indicators of a graph of a traction substation power transformer. 

scholarly journals Coupling real-time simulation of power supply, trains and dispatching for urban rail transit

2021 ◽  
Author(s):  
Yu Zhang ◽  
Zhaoyang Zhang ◽  
Li'en Xu ◽  
Ting Ying ◽  
Jianghong Li ◽  
...  
Keyword(s):  
Real Time ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Simulation System ◽  
Urban Rail Transit ◽  
System Structure ◽  
Rail Transit ◽  
Free Expansion ◽  
Urban Rail

Abstract In order to study the interaction among the traction power supply, the train group and the operation dispatching of urban rail transit, a coupling simulation system of power supply system, trains and dispatching management is constructed. In order to solve the problems of different timescales and difficult cooperation operation for related subsystems, a multi-bus distributed real-time network architecture based on hierarchical management of communication data is established, and simulation management software is developed to facilitate the free expansion of the simulation system. Meanwhile, the track line, train operation and other large timescale subsystems are realized by the pure digital simulation. And the time-sensitive subsystems, such as train traction system, braking system, auxiliary power supply system and network system etc., are built by the semi-physical simulation. In this article, the system structure and the main implementation principle of each simulation subsystem are given in detail, and the system is tested and verified at the end. The results show that the simulation system can meet the expected requirements.

scholarly journals Measurement of currents and voltages non-sinusoidal parameters in power supply systems with rectifier load

2018 ◽  
Vol 245 ◽  
pp. 06007 ◽  
Author(s):  
Valery Vanin ◽  
Alexandr Bulychov ◽  
Maxim Popov ◽  
Olga Vasilyeva ◽  
Maria Shakhova
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Negative Impact ◽  
Supply System ◽  
Municipal Services ◽  
Quality Indices ◽  
Electric Drives ◽  
Traction Substation ◽  
Railway Traction ◽  
Supply Systems

The use of frequency-controlled electric drives in industry and municipal services is accompanied by the problem of their negative impact on the distribution network. As examples, the results of measurements of power quality indices in the power supply system of an oil producing enterprise and on the supply input of a railway traction substation are given. It is shown that the voltage subgroup total harmonic distortions (THDS) can exceed their rated permitted values in 100% of the measurement time.

Math model of a power beam feeding a spacecraft under conditions of intermittent power supply

2020 ◽  
pp. 56-65
Author(s):  
Aleksey M. BEZNYAKOV ◽  
Aleksey V. NEMIROV ◽  
Gennadiy B. STEGANOV
Keyword(s):  
Power Consumption ◽  
Power Supply ◽  
Power Plants ◽  
Power Supply System ◽  
Supply System ◽  
Solar Array ◽  
Math Model ◽  
Operational Conditions ◽  
Supply Systems

The paper discusses transmission, reception, conversion and consumption of energy of laser and microwave radiation from Earth or space power plants. It proposes a classification of advanced systems for remote supply of power to spacecraft (SC). It addresses practicability of using remote power supply to SC under various operational conditions. The paper formulates the problem of evaluating the capability of the existing SC power supply systems to receive and convert emissions from additional sources. An analysis of criteria for the quality of pulsed or rapidly varying flow of energy into a SC power supply system. It reviews the structures of typical channels of power consumption in a SC power supply system. An equivalent circuit replacing receivers of pulsed or rapidly changing radiation is described. A math model is proposed for a power consumption channel operating under conditions of intermittent power supply to photovoltaic converters. Math modeling results are presented and analyzed. Key words: space power plant, solar array, onboard power supply system, power consumption channel, voltage converters.

scholarly journals Improvement of Quadruple Structure and Optimization of Control Algorithm for Co-Phase Traction Power Supply System

2020 ◽  
Vol 38 (5) ◽  
pp. 1112-1121
Author(s):  
Shu Cheng ◽  
Chang Liu ◽  
Jianxiang Tang ◽  
Tianjian Yu ◽  
Kaidi Li
Keyword(s):  
Power Supply ◽  
Control Algorithm ◽  
Power Supply System ◽  
Reactive Power ◽  
Supply System ◽  
System Structure ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
And Control ◽  
Traction Power

Co-phase power supply is one of the key technologies to solve the technical bottlenecks such as electrical phase separation zone, poor power quality and defects in structure and control algorithms in traditional traction power supply systems and single co-phase power supply schemes, and an inevitable way to realize the development of electrified railways in the direction of safety, high speed and heavy load. Based on the single co-phase power supply technology, a novel quadruple co-phase power supply scheme with negative sequence elimination and to suppress reactive power and harmonic better for the two aspects of the system structure improvement and control algorithm optimization is proposed by combining the technologies of power system flexible transmission grid-connected and multiple inverters. Finally, the simulation model for the novel co-phase traction power supply system was designed and built, and the present method was verified by a set of simulation experiments so as to obtain the expected results.

Rationalisation of the Operation Process of Power Supply Systems of Highway Telematics

2016 ◽  
Vol 817 ◽  
pp. 253-260
Author(s):  
Adam Rosiński
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
The State ◽  
System Of Equations ◽  
Operation Process ◽  
Supply Systems

The paper presents the issues related to the operation of the operation process of the power supply system of highway telematics. A relationships graph was presented in the considered system, and the Kolmogorov-Chapman system of equations was derived to describe it. Drawing on those equations, relationships for calculating probability of the power supply system staying in state of complete usability SPZ, state of the impendency over safety SZB as well as the state of unreliability of safety SB were derived. Next, this enabled rationalisation of the operation process of the analysed systems.

scholarly journals Modeling of reliability of power supply systems with autonomous energy source

2019 ◽  
Vol 139 ◽  
pp. 01036
Author(s):  
M.S. Ershov ◽  
R.B. Jalilov ◽  
S.P. Shayimova ◽  
A.I. Choriyev ◽  
M.R. Charieva
Keyword(s):  
Energy Source ◽  
Comparative Analysis ◽  
Power Supply ◽  
Power Supply System ◽  
Random Processes ◽  
Supply System ◽  
Software Implementation ◽  
Energy Sources ◽  
Markov Random ◽  
Supply Systems

The methodology for calculating the reliability of power supply systems with autonomous and mixed energy sources has been considered. Autonomous sources are widely used in industrial power supply systems as primary, backup or emergency sources. The functioning and interchangeability of these systems has features that affect the reliability of power supply. The proposed methodology is based on the method of semi-Markov random processes and can be used for comparative analysis of the reliability of options for power supply systems. The methodology has been brought to software implementation and is accompanied by an example of calculating the reliability of the power supply system for stationary marine oil production platforms.

scholarly journals A Dispatching Optimization Model for Park Power Supply Systems Considering Power-to-Gas and Peak Regulation Compensation

Processes ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 813 ◽  
Author(s):  
Yunfu Qin ◽  
Hongyu Lin ◽  
Zhongfu Tan ◽  
Qingyou Yan ◽  
Li Li ◽  
...  
Keyword(s):  
Power Supply ◽  
Optimization Model ◽  
Power Supply System ◽  
Clean Energy ◽  
Supply System ◽  
Compensation Mechanism ◽  
Net Profit ◽  
The Stability ◽  
Power To Gas ◽  
Supply Systems

To ensure the stability of park power supply systems and to promote the consumption of wind/photovoltaic generation, this paper proposes a dispatching optimization model for the park power supply system with power-to-gas (P2G) and peak regulation via gas-fired generators. Firstly, the structure of a park power system with P2G was built. Secondly, a dispatching optimization model for the park power supply system was constructed with a peak regulation compensation mechanism. Finally, the effectiveness of the model was verified by a case study. The case results show that with the integration of P2G and the marketized peak regulation compensation mechanism, preferential power energy storage followed by gas storage had the best effect on the park power supply system, which minimized the clean energy curtailment to 11.18% and the total cost by approximately $120.190 and maximized the net profit by approximately $152.005.

scholarly journals The methodology for choosing solutions by developing an optimal topology of power supply system

2021 ◽  
Vol 289 ◽  
pp. 01018
Author(s):  
Olga Svezhentseva ◽  
Marina Umnova
Keyword(s):  
Genetic Programming ◽  
Power Supply ◽  
Power Supply System ◽  
Optimization Problems ◽  
Supply System ◽  
Optimal Topology ◽  
Single Task ◽  
Intractable Problem ◽  
Supply Systems ◽  
Formal Statement

The development of the optimal topology of power supply systems for various purposes is an intractable problem that cannot be formalized as a single task. This problem can be considered as a complex of tasks having a hierarchical structure – the hierarchy is present both at the functional and at the territorial levels. The main typical tasks arising in the process of developing of the optimal topology of the power supply system in a city microdistrict are highlighted, a formal statement of tasks is given, methods for their solution are proposed and demonstrated. Approaches to solving typical problems are built on the theory of combinatorial analysis, methods of heuristic modeling, genetic programming, methods for solving optimization problems on graphs.

scholarly journals Simulation modeling of the power supply system of the coal mine excavation area with facts devices

2021 ◽  
Vol 315 ◽  
pp. 01013
Author(s):  
Vyacheslav Voronin ◽  
Fedor Nepsha ◽  
Andrew Kulikov ◽  
Anton Korneev ◽  
Anastasia Khasanova
Keyword(s):  
Coal Mine ◽  
Power Supply ◽  
Power Supply System ◽  
Coal Mines ◽  
Voltage Regulation ◽  
Supply System ◽  
Mining Equipment ◽  
Extraction Area ◽  
Facts Devices ◽  
Supply Systems

The introduction of technologies for active-adaptive control of the operating modes of the power supply systems of coal mines can contribute to an increase in the energy efficiency of coal mining. High-response FACTS devices of the second generation can be used for dynamic reactive power compensation, voltage regulation and limitation of current and voltage harmonic components in conditions of sharply variable electrical loads of mining machines at a breakage face. Evaluation of the effectiveness of the implementation of FACTS devices in the power supply systems of coal mines can be performed using simulation methods.This article discusses the main approaches to the development of a simulation model of a power supply system of a coal mine, mining equipment and FACTS devices. The main results of modeling the joint operation of mining machines are shown. Conclusions about the effectiveness of the use of FACTS devices in the extraction area of a coal mine are made.

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