ELECTRICITY LOSSES IN AC TRACTION NETWORK WITH STATIC REACTIVE POWER GENERATOR

2020 ◽  
pp. 17-28
Author(s):  
L.A. German ◽  
A.I. Chivenkov
Keyword(s):  
Reactive Power ◽  
Power Generator ◽  
Traction Network

scholarly journals Increasing railway capacity with the installation of reactive power compensation

2021 ◽  
Vol 80 (1) ◽  
pp. 35-44
Author(s):  
L. A. GERMAN
Keyword(s):  
Reactive Power ◽  
Operational Efficiency ◽  
Payback Period ◽  
Reactive Power Compensation ◽  
Power Generator ◽  
Term Operation ◽  
Traction Network ◽  
Thyristor Switch ◽  
Railway Capacity

The article considers existing regulated installations of transverse capacitive compensation for increasing the capacity of sections of the traction network of 25 and 2×25 kV of Russian railways. Characteristics of a static reactive power generator based on bipolar IGBT transistors (manufactured by LLC NPP “RU-Engineering”, Naberezhnye Chelny), a switchable filtercompensating unit (manufactured by the Gorkovskaya Railway and the Nizhny Novgorod branch of SamGUPS), a three-stage switchable filter-compensating unit. To increase the capacity, all installations are switched on at the traction network sectioning posts. Long-term operation of the static reactive power generator and switchable filter-compensating unit have proven their operational efficiency. At the same time, the following upgrades are proposed: in a static reactive power generator it is proposed to reduce the installed power, replacing it with unregulated compensation, and in a switchable filter-compensating installation, it is proposed to switch in 400–500 V steps to normalize the traction mode of the electric rolling stock.It is shown that in terms of technical characteristics, a switchable filter-compensating installation with a thyristor switch is not inferior to a static generator of reactive power in terms of increasing the capacity, and in some respects it surpasses it. On the whole, in terms of payback period, a switchable filter-compensating installation surpasses a static generator of reactive power due to the high cost of the latter. The following options for using the considered installations are proposed. With the required power of transverse capacitive compensation units up to 5–6 MVAr, to increase the capacity, switchable filter-compensating units should be installed. Taking into account real loads, such a solution will be implemented at most sectioning posts. For installations with a capacity of more than 5–6 MVAr, the option of using a static reactive power generator of reduced power should be considered: at high loads, its efficiency will increase.

Photovoltaic solar system connected to the electric power grid operating as active power generator and reactive power compensator

Solar Energy ◽  
2010 ◽  
Vol 84 (7) ◽  
pp. 1310-1317 ◽  
Author(s):  
Fabio L. Albuquerque ◽  
Adélio J. Moraes ◽  
Geraldo C. Guimarães ◽  
Sérgio M.R. Sanhueza ◽  
Alexandre R. Vaz
Keyword(s):  
Solar System ◽  
Electric Power ◽  
Reactive Power ◽  
Power Grid ◽  
Active Power ◽  
Power Generator ◽  
Electric Power Grid ◽  
Reactive Power Compensator

scholarly journals Reduction of electric power losses by the reactive power compensation unit at the point of AC electric traction network sectioning

2019 ◽  
Vol 78 (5) ◽  
pp. 297-302
Author(s):  
Leonid A. German ◽  
Aleksander S. Serebryakov
Keyword(s):  
Electric Power ◽  
Carrying Capacity ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Baseline Data ◽  
Power Losses ◽  
Method Of Calculation ◽  
Traction Network ◽  
Electric Traction ◽  
Positive Effect

Changes of electric traction network with regulated and not-regulated reactive power compensation units (CU) are required due to switching on the reactive power static generators at the AC electric traction network sectioning points the specifying calculations of the reactive power. The method of calculation of power losses in the traction network with regulated and not-regulated cross capacity compensation units at the sectioning point was developed. The main positive effect of CU at the sectioning point is increasing of the carrying capacity of the railroad sections. However, calculation of CU effectiveness for reduction of electric power losses, as well as calculation of continuously controlled CU requires appropriate calculations. It is demonstrated that CU effectiveness at the sectioning points of reactive power compensation is reduced in connection with distribution of the draft load; CU regulation effectiveness is also reduced as a response to increase of the carrying capacity of the railroad section, which allows assessing the proposed calculation formulae. Presented examples of calculation for the actual baseline data demonstrate that full losses in the traction network (assumed as 100%) can be reduced by using of CU of the sectioning point up to 21% maximum with continuously controlled units and up to 13.4% with uncontrolled CU. As automatics of the reactive power static generator is designed for increasing the carrying capacity of the railroad, its operation frequently complies with the reactive power overcompensation regime when losses in the traction network are increased.

Research on Active Disturbance Rejection Control Strategy of Static Reactive Power Generator

2015 ◽  
Vol 1092-1093 ◽  
pp. 316-320
Author(s):  
Jing Bai ◽  
Yu Zhang ◽  
Hui Da Duan ◽  
Shi Qi Lu ◽  
Chao Chao Li ◽  
...  
Keyword(s):  
Control Strategy ◽  
Pid Control ◽  
Disturbance Rejection ◽  
Control Algorithm ◽  
Reactive Power ◽  
Error Feedback ◽  
Power Generator ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Nonlinear State

For the shortcomings of large overshoot and poor anti-disturbance ability when using the traditional PID control, ADRC control algorithm that is a nonlinear state error feedback control algorithm has been proposed in the sophisticated control system of static reactive power generator. The simulation results show that the algorithm can make the system reactive power compensation more quickly and more effectively, therefore the control strategy is feasible.

Design and Simulation of Variable Speed Constant Frequency Brushless Doubly Fed Wind Power Generator

2011 ◽  
Vol 383-390 ◽  
pp. 537-542
Author(s):  
Kai Jun Wu ◽  
Yan Yan Wang
Keyword(s):  
Wind Power ◽  
Reactive Power ◽  
Variable Structure ◽  
Constant Frequency ◽  
Power Generator ◽  
Structure Control ◽  
Power Decoupling ◽  
Wind Power Generator ◽  
Doubly Fed ◽  
And Control

Brushless Doubly-fed Machine (BDFM) is a new inverter-driven induction motor, and it has broad prospects in wind power generation. This paper analyses the structure and VSCF electricity generating principle of a cascade Brushless Doubly fed Wind Power Generator, deduces the BDFG’s mathematical model, The variable structure control (VSC) was used to the active and reactive power decoupling control of the BDFM, analysis the relation of electromagnetism and energy balance .Finally, simulation and analysis of the whole system and control strategy are carried through in matlab/simulink soft. According to these results, the correct of parameters and simulation model for BDFM is proved.

A Reactive Power Generator Based on Voltage Source Inverter

2012 ◽  
Vol 260-261 ◽  
pp. 432-437
Author(s):  
Tao Song
Keyword(s):  
Power Systems ◽  
Power Factor ◽  
Reactive Power ◽  
Voltage Source ◽  
Total Power ◽  
Good Effect ◽  
Voltage Source Inverter ◽  
Nonlinear Load ◽  
Power Generator ◽  
Reactive Compensation

With the application of large scale nonlinear load in power systems, lots of harmonic are produced, causing the total power factor to decrease. Therefore, it needs to compensate the reactive power of power systems. The disadvantages of the widely applied static var compensator are that the size of the compensator is too large, and the control ability is poor when the capacity of power systems is small. So a reactive power generator based on voltage source inverter is proposed in this paper. The reactive power generator takes series connection of IGBTs as the main circuit structure, the inverter as core and DSP as controller. The close loop framework consists of human-computer interaction, measurements and feedback control. The inverter is controlled by a digital PI close loop controller to feed a phase adjustable current to power systems to compensate reactive power. The system’s structure is simple, the control is flexible, and the size is small. The test results show that the response of this reactive power generator is quick, and it can compensate the power factor to be 1 which means that it has good effect of static reactive compensation.

Loss Of Excitation (LOE) Protection of Synchronous Generator

2017 ◽  
Vol 8 (1) ◽  
pp. 230 ◽  
Author(s):  
Hui Hwang Goh ◽  
Sy yi Sim ◽  
Mohd. Nasri Abd Samat ◽  
Ahmad Mahmoud Mohamed ◽  
Chin Wan Ling ◽  
...  
Keyword(s):  
Reactive Power ◽  
Harmful Effect ◽  
Synchronous Generator ◽  
Synchronous Generators ◽  
Financial Cost ◽  
New Techniques ◽  
Power Generator ◽  
Grid Systems ◽  
Protection Scheme ◽  
Power Swing

<p>Synchronous generators require certain protection against loss of excitation because it can lead to harmful effect to a generator and main grid. Systems of powers are evolving with applications of new techniques to increase reliability and security, at the meantime techniques upgradation is being existed to save financial cost of a different component of power system, which affect protection ways this report discuss the way of loss of excitation protection scheme for an increase in a synchronous generator. It is obvious that when direct axis synchronous reactance has a high value, the coordination among loss of excitation protection and excitation control is not effective. This lead to restricting absorption capability of the reactive power generator. This report also reviews the suitable philosophy for setting the limiters of excitation and discusses its effect on loss of excitation protection and system performance. A protection scheme is developed to allow for utilization of machine capability and power swing blocking is developed to increase the reliability when power swing is stable.</p><p><em> </em></p>

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