The principles of the hybrid back-to-back hvdc model

Abstract

The hybrid model of back-to-back HVDC is based on the concept of hybrid simulation and includes mathematical models of transformers, harmonic filters, phase reactors, direct current circuit and physical models of a static voltage converter, as well as model of an automatic control and protection system whose operation algorithms implemented at the digital level. The principle of realization of the mathematical models is presented, by example of the harmonic filter model, as well as the physical model of the static voltage converter. The developed hybrid model is integrated into the simulation complex, based on the concept of hybrid simulation, and in which a test scheme of a two-machine electric power system is prepared. In this scheme, the case of a short circuit and power control through the back-to-back HVDC are reproduced. The obtained simulation results coincide with the results obtained in the MatLAB Simulink, which indicates the compliance of the developed model to the digital model. In this case, the properties and capabilities of the concept of hybrid modeling, and as a result the developed model and simulation complex, allow using them in modeling the large scale electric power systems, including in real time and for an unlimited time interval, unlike many digital hard- and software complexes.