A study on effect on simulation by using reduced model of transmission network for real-time power system simulator

In modern power systems, it is important to analyze many dynamic phenomena which appear on the system when the usefulness of new power electronic based apparatus protective relay systems and others is verified, for which a real-time power system simulator is becoming a very effective means. In general, however, it is very expensive and it is very difficult for beginners to understand how to use it. Therefore, studies on low-cost and easy-use real-time power system simulators have so far been done. We have developed models of power system components for the real-time power system simulator using DSP (digital signal processor) combined with commercial CAD (computer aided design) software "MATLAB/SIMULINK". The use of commercial software can drastically decrease the development cost of the simulator. In this paper, a simplified reduction model of a transmission network consisting of unbalanced three phase transmission line with mutual impedance is proposed for reducing computing time for the transmission network of the digital simulator.