Modified electromagnetic transient model of transmission line based on rotation transformation

Abstract

The traditional electromagnetic transient (EMT) model of transmission line is very slow for the large-scale power systems simulation due to the small step. To accelerate the electro-magnetic transient program (EMTP) calculation, a modified line model used for realising multi-step simulation is proposed. This model is based on the timescale transformation of single-phase coordinate which can transform the primary high-frequency signal into a lower one. By this means, the part which needs to be simulated in detail, such as power electronic devices, can be calculated with a small time step, and a large time step can be used for the other part. In this article, the basic theory of timescale transformation is introduced firstly, and then the new line model is deduced in detail. Finally, a simple system is simulated by the new and traditional model, respectively, and the validity of this approach is verified by comparing with the traditional EMTP simulation. Furthermore, due to the large-step simulation, the calculation speed is improved.

Keywords

• power system simulation
• power system transients
• EMTP
• power transmission lines
• large-step simulation
• calculation speed
• modified electromagnetic transient model
• transmission line
• rotation transformation
• large-scale power systems simulation
• EMTP calculation
• modified line model
• multistep simulation
• timescale transformation
• primary high-frequency signal
• power electronic devices
• single-phase coordinate