Transient short circuit current calculation using reduced and decoupled DQ0 networks

This paper presents a new method of calculating transient short circuit current in a large multi-machine power system that is numerically efficient, accurate and stable. The proposed methodology is based on network reduction that finds a minimally equivalent network, retaining buses where the machines and the fault are located, upon which the simulation is carried out. With a much reduced network the computation speed-up is huge. The new method also proposes working in dq0 domain either for the machines or the network components both in their individual model and in their integration as a system all throughout the computation stages. Besides saving the storages it gives a stable and accurate simulation.