Abstract
Nowadays, the negative impact of traction load on power system operation poses a serious problem that may lead to false tripping or even failures of relay protection devices and reduce the quality of electrical energy. This situation is typical for the Zabaikal power system, in which in some areas the share of electricity consumption by railway reaches 70% of total consumption. A computing tool, that would allow simultaneous analysis of the modes, both in the utility’s grid and in the traction network, do not exist. The inability to carry out such analysis often leads to inconsistency in the actions of control centers and railway transport authorities, especially when maintenance planning. Mathematic modeling in such software systems as “Mustang”, “RastrWin3”, “MathCAD”, “Matlab/Simulink”, “PSCAD”, “Kortes”. The developed model represents Zabaikal power system and contain detailed railway between substation Razmahnino – Shilka, Chita – Mogocha. Negative-sequence voltage unbalance factors were calculated for the case of train movement between substation Razmahnino and substation Shilka. Also, the necessity of back-up relays tripping values correction is stated. It was shown that for the powerflow calculations taking into account the traction load, it is rational to use a complex mathematical model, which uses compatible software systems with the ability of quick and easy data exchange.
Highlights
Nowadays, a negative impact of traction load on utility grid operation is widely observed in numerous publications [1,2,3,4,5,6]
This is typical for Zabaikal powersystem (ZPS), where separate railway sections consume up to 70% from total demand
Voltage rises up to 110–130% of nominal voltage if there are no locomotives on the track
Summary
A negative impact of traction load on utility grid operation is widely observed in numerous publications [1,2,3,4,5,6] This effect is strongly pronounced when railway consume more than 50% of total demand in the powersystem. According to [3] it is planned to increase freight traffic through Transib railway, through Zabaikal railway too until 2030 Coordinated actions both of the control centers and railway authorities may often lead to mistakes when network calculations accounting the railway influence. Problem formulation The challenge is there are no any means that would facilitate utility system mode analysis considering traction systems impact As it was mentioned before, this fact causes inappropriate responses of control centers and railway authorities, especially while maintenance planning.
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