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.
For the company, ENGIE Lab Laborelec, we at POWERSYS performed an electromagnetic interference study, in order to evaluate the influences of three transmission lines (220 kV and 70 kV) on a buried gas pipeline. This is according to the standards ITU-T K33 and IEC 60479-1.
Different kinds of installations (metallic pipelines, telecommunication systems, power systems) can be subject to induced voltage and current in the vicinity of electrical systems. The operating conditions (normal steady-state or fault) of the disturbing systems and the position (overhead or buried) of each installation are the origin of inductive, capacitive, or conductive coupling. Electromagnetic interferences studies can be performed to investigate these effects.
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).