Analysis of measurement and simulation results of freight train power supply
Modeling of electric railway system
A model of electric railway system connected to 110 kV network was developed in order to determine power quality parameters of voltage and current. A model consists of electric railway substation and contact line feeding electric locomotives equipped with diode rectifiers. Figure 12 shows the model in EMTP-RV software which is used for analysis of electromagnetic transients.
An electric railway substation consists of one 110/25 kV transformer with rated power 7.5 MVA which is connected to the transmission grid. The transformer impedance was calculated from the manufacturer data.
POWERSYS has discussed EMTP-RV with Mr. Jair Cassoli, Electrical Engineer at Enercon. Founded in 1984 in Germany, ENERCON is a leader in the design and sale of wind turbines and recognized worldwide for reliability and performance of its direct drive generators, its high manufacturing standards and its long-term service agreements.
To date, ENERCON has installed more than 24,500 wind turbines worldwide, ranging from 500 kW to 7.5 MW, accounting for over 38.6 GW of installed capacity. ENERCON employs over 20,000 persons worldwide and has its head office in Aurich, Germany.
They carried out a simulation study using EMTP-RV and they consequently wrote a technical paper to present their work.
The mission of the R&D department is to help the operators of all electricity production sites to buy, put under service, maintain and troubleshoot all the electrical machines (transformers, power generators and motors).
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In 2011, CIGRE B4 study committee initiated several Working Groups (WG) to study the potential future introduction of dc grid. In order to organize the discussions among the groups it was decided to develop a VSC based DC Grid test system with ac and dc systems with all input data.