scholarly journals Reactive Power Compensation for Non-Traction Railway Consumers

2020 ◽  
Vol 64 (188) ◽  
pp. 129-135
Author(s):  
Andrii M. Mukha ◽  
Oleh I. Bondarr
Keyword(s):  
Power Supply ◽  
Reactive Power ◽  
Voltage Drop ◽  
Distribution Networks ◽  
Reactive Power Compensation ◽  
Traction Current ◽  
Power Factor Corrector ◽  
Compensation Device ◽  
Traction Power Supply ◽  
Traction Power

This paper deals with the problems of power supply efficiency for non-traction railway customers. Unlike public distribution networks, the non-traction power supply network is within the zone of influence of electromagnetic fields and the conductive influence of the distorted traction current. As a result, poor power quality and additional losses are typical for non-traction railway networks. Subsequently, conflicts due to the low quality of electricity may arise between the railway and its customers powered by the distribution networks of the railway. The influence of a reactive power compensation device on the voltage drop in a non-traction power line is investigated in the article. The implementation of reactive power compensation allows voltage losses during its transmission to the final consumer to be reduced by almost 5% and electricity losses by 3%. Keywords: non-traction consumer, power factor corrector, reactive power compensator, graph of electric network, nodal analysis

scholarly journals Method for improving performance of devices for adjustable reactive power compensation

2019 ◽  
Vol 110 ◽  
pp. 01010
Author(s):  
Vasiliy Cheremisin ◽  
Andrey Nikonov
Keyword(s):  
Power Supply ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Point Selection ◽  
Traction Power Supply System ◽  
Current Voltage ◽  
Compensation Device ◽  
Traction Power Supply ◽  
The Relationship ◽  
Traction Power

The article presents a method for selecting the parameters of the current-voltage characteristics of adjustable reactive power compensation devices used at sectioning stations of railway sections electrified by alternating current with a voltage of 27.5 kV. This technique is based on the experience of operating two types of devices in the traction power supply system. Power control of these devices is implemented by the voltage level at the switching point. Selection of the setpoint voltage and slope characteristics was done. The developed method allows increasing the efficiency of devices by eliminating the voltage losses on the active component of traction loads. That will reduce the loss of electricity in the system of traction power supply. Changing the parameters of the characteristics will increase the relationship between the reactive power consumed in the zone and the voltage measured by the devices. Following the results of the formation of the methodology, an example of the choice of characteristics for a real compensation device is presented.

Conventional DC Voltage Operating System for High Speeed Traction Power Supplies Using LLC-HPQC Control

2015 ◽  
Vol 4 (4) ◽  
pp. 118
Author(s):  
Ch. Lenin Babu ◽  
P. Harinath Reddy ◽  
T. Reddi Sekhar
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Reactive Power ◽  
Design Procedure ◽  
Power Supplies ◽  
Parameter Design ◽  
Voltage Level ◽  
Harmonic Compensation ◽  
Traction Power Supply ◽  
Traction Power

<p>In this paper a hybrid power quality compensator (HPQC) is proposed for compensation in cophase traction power supply and minimum dc operation voltage is achievable for high-speed traction power supply. The parameter design procedure for minimum dc operation voltage in HPQC as well as minimum voltage rating with load PF is discussed. The detailed discussions of proposed circuit configurations of HPQC are provided in section II, together with comparison with conventional RPC. In comparison with conventional railway power compensator proposed HPQC can achieve reduced dc link voltage level. It is also verified through simulations results that the LLC-HPQC would operate at the minimum voltage with the proposed parameter design. HPQC is able to provide system unbalances, reactive power, and harmonic compensation in cophase traction power with reduced operation voltage. The cophase traction power supply with proposed HPQC is suitable for high-speed traction applications.</p>

scholarly journals DETERMINATION OF THE MAXIMUM VOLTAGE AT THE PHOTOVOLTAIC POWER PLANT CONNECTION POINT

2021 ◽  
pp. 10-15
Author(s):  
Mykola Volodymyrovych Bazylevych
Keyword(s):  
Power Plant ◽  
Power Supply ◽  
Power Plants ◽  
Reactive Power ◽  
Voltage Drop ◽  
Mode Of Delivery ◽  
Distribution Networks ◽  
Electrical Network ◽  
Successive Approximations ◽  
Photovoltaic Power

The modes of the electrical network have not been calculated for the photovoltaic power plants if they are used for small and medium-sized applications. It is known that the voltage at the point of installation of a photovoltaics power plant may exceed the critical limit voltage and as a result it may cause the emergency with the electrical equipment. According to the existing methods, it is possible to find the voltage only by full electrical network modes calculating. In practice such calculation is not convenient, especially for 0.4 kV distribution networks. The suggestion is to find the most probable limit voltage at the point of installation of a photovoltaic power plant without calculating the mode of the electrical network using instead the information about the voltage value in the power supply centre. The voltage at the installation point of the photovoltaic power plant mainly depends on the generated power of the photovoltaics power plant, line resistance, load power connected to a voltage of 0.4 kV and bus voltages of 0.4 kV of the power supply. The voltage hardly depends on the power of the power transformer, the parameters of 10 kV lines and the parameters of 0.4 kV lines, except for the line "power centre–photovoltaic power plant". The highest voltage at the point of installation of the photovoltaics power plant will be in the case when the load on the line is absent. The suggested methods allow finding analytically the maximum value of voltage at the point of installation of a photovoltaic power plant without using of the successive approximations methods. As a rule the photovoltaics power plant operates in the mode of delivery of the maximum active power. By the range of various analytical formulas, the value of voltage at the point of installation of a photovoltaic power plant has been determined. The accuracy of finding the voltage by different formulas has also been determined. It is established that in order to achieve the required accuracy, the dependence of the current at the output of the photovoltaics power plant on the voltage at the connection point should be taken into account. Modification of formulas for the purpose of simplification of their application is considered. The conditions for finding the maximum possible voltage value at the point of installation of a photovoltaics power plant are considered. This requires that the argument of the voltage drop vector on the line be equal to the argument of the voltage vector on the busbars of the power supply. This is achieved by the fact that the photovoltaic power plant generates active and reactive power in a certain ratio. It is shown the inexpediency of finding the maximum possible voltage value at the point of installation of a photovoltaic power plant due to a small difference with the most possible voltage value with a significant complication of calculations.

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.

scholarly journals Analysis of compensating devices efficiency in ac traction power supply systems

2021 ◽  
Vol 2131 (4) ◽  
pp. 042083
Author(s):  
A V Agunov ◽  
D A Sokolov
Keyword(s):  
Power Supply ◽  
Reactive Power ◽  
Electricity Consumption ◽  
Traction Power Supply System ◽  
Consumption Reduction ◽  
Before And After ◽  
Compensating Devices ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Traction Power

Abstract The article describes the main methods of reactive power compensation used in 27.5 kV AC traction power supply systems on the railways of the Russian Federation. The cases of installation of the longitudinal and transverse capacitive compensation devices at traction substation and sectiolizing post are considered in this paper. Based on experimental data their effectiveness has been analysed by comparing the main parameters of the traction power supply system before and after the installation of the compensating devices. The main effect in terms of power consumption reduction is achieved through application of reactive power cross-compensation devices. The results of the analysis show that the total electricity consumption in the researched area decreased by 23 % and the proportion of higher harmonic elements of voltage decreased by 15 %.

scholarly journals Algorithm for calculating the rail-ground potential in heavy load conditions

2021 ◽  
Vol 284 ◽  
pp. 06002
Author(s):  
Ivan Ignatenko ◽  
Sergey Vlasenko ◽  
Evgeniy Tryapkin ◽  
Vladimir Kovalev
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Alternating Current ◽  
Supply System ◽  
Traction Power Supply System ◽  
Traction Current ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Ground Potential ◽  
Traction Power

Increased freight turnover on railway transport inevitably leads to increased traction current in DC and AC traction power supply systems. The increase in traction current is already causing problems related to the normal operation of the 25 kV AC traction power supply systems. One of the adverse consequences of the increased traction currents is the increased rail-to-ground potential. This has already caused a number of accidents and related traffic interruptions on the Far Eastern Railway of Russia and other railway sections powered with alternating current. The study considers the problem of increased rail-to-ground potentials and provides basic formulae for calculating the wave parameters of the rail network and rail-to-ground potentials. Various methods are given for calculating rail-to-ground potentials for a 25 kV AC traction power supply system. Since in an alternating current system, expressions for calculating the potential are functions of a complex variable, the calculation of such expressions requires the use of special programs. Adaptation of existing methods to modern software and computing systems allows you to optimize and significantly speed up the process of calculating the “rail-to-ground” potentials, either considering the use of certain potential-reducing measures or not. A calculation method includes an algorithm developed for calculating the rail-to-ground potentials in the 25 kV AC traction power supply system for an inter-substation zone of any length with any number of electric locomotives within the zone.

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