Integration of Real-Time Controls and Computer Programs for Simulation of Direct Current Transmission

Abstract

Studies of dynamic performance of dc transmission and static var compensators, for example, often involve control modeling in dynamic stability programs, detailed (point-on-wave) control models in EMTP or other transients programs, and real-time control on a physical system simulator. This paper introduces a new concept: actual real-time controls are interfaced with a digital system simulator without relaxation of real-time constraints. The concept, time transposition, synchronizing and software interface aspects are discussed. The approach has implications for enhanced simulation, controller design and on-site controller diagnostics. It applies to various forms of real-time digital control for power systems. © 1990 IEEE