A New Approach for Integration of Two Distinct Types of Nu- merical Simulator

Electromagnetic transient simulation and electromechanical transient simulation are two distinct types of simulators, based on different modeling techniques. EMTP comprises a three-phase simulation engine which can accommodate phase unbalance and waveform distortion. TSP produces phasor solutions, usually only positive sequence, in the time domain. This paper presents a hybrid simulator, based on interfacing the two types of simulators. Hybrid simulation has the advantages of being computationally inexpensive while providing detailed dynamic modeling of systems containing nonlinear components such as HVDC and FACTS devices. By exchanging information between EMTP and TSP at specified time intervals, the two simulation engines can be integrated together almost seamlessly. Some of the problems associated with the interface and a new protocol which successfully solves the interface problems are described. A case study of an SVC interfaced to a 9-bus 3machine system, demonstrates the accuracy of the approach.