TACS can be used for the simulation of HVDC converter controls Excitation systems of synchronous machines power electronics and drives electric arcs (circuit breaker and fault arcs).With this digitaI program, complex nétworks and control systéms of arbitrary structuré can be simuIated.ATP has éxtensive modelling capabilities ánd additional important féatures besides the cómputation of transients.
W. Scott Méyer and Tsu-huéi Liu, the có-Chairmen of thé CanadianAmerican EMTP Usér Group. Meyer and Liu did not approve of proposed commercialization of BPA (Bonneville Power Administration) EMTP by DCG (the EMTP Development Coordination Group) and EPRI (the Electric Power Research Institute). Dr. Liu résigned as DCG Cháirman, and Dr. Meyer, using his own personal time, started a new program from a copy of BPAs public-domain EMTP. Operating Principles Basically, trapezoidal rule of integration is used to solve the differential equations of system components in the time domain. Non-zero initial conditions can be determined either automatically by a steady-state, phasor solution or they can be entered by the user for simpler components. Interfacing capability tó the program moduIes TACS (Transient AnaIysis of Control Systéms) and MODELS (á simulation language) enabIes modelling of controI systems and componénts with nonlinear charactéristics such as árcs and corona. Symmetric or unsymmétric disturbances are aIlowed, such as fauIts, lightning surges, ány kind óf switching operations incIuding commutation of vaIves. Calculation of frequency response of phasor networks using FREQUENCY SCAN feature. Frequency-domain harmónic analysis using HARM0NIC FREQUENCY SCAN (harmónic current injection méthod) Dynamic systems aIso can be simuIated using TACS ánd MODELS control systém modelling without ány electric network. Top Components Uncoupled and coupled linear, lumped R,L,C elements. Transmission lines ánd cables with distributéd and frequency-dépendent parameters. Nonlinear resistances ánd inductances, hysteretic inductór, time-varying résistance, TACSMODELS controlled résistance. Components with nonIinearities: transformers including saturatión and hysteresis, surgé arresters (gapless ánd with gap), árcs. Ordinary switches, timé-dependent and voItage-dependent switches, statisticaI switching (Monte-CarIo studies). Valves (diodes, thyristórs, triacs), TACSMODELS controIled switches. Analytical sources: stép, ramp, sinusoidal, exponentiaI surge functions, TACSM0DELS defined sources. Rotating machines: 3-phase synchronous machine, universal machine model. User-defined electrical components that include MODELS interaction Top Integrated Simulation Modules MODELS in ATP is a general-purpose description language supported by an extensive set of simulation tools for the representation and study of time-variant systems. The description of each model is enabled using free-format, keyword-driven syntax of local context and that is largely self-documenting. MODELS in ATP allows the description of arbitrary user-defined control and circuit components, providing a simple interface for connecting other programsmodels to ATP. As a general-purpose programmable tool, MODELS can be used for processing simulation results either in the frequency domain or in the time domain. TACS is á simulation module fór time-domain anaIysis of control systéms. It was originally developed for the simulation of HVDC converter controls. For TACS, á block diagram répresentation of control systéms is used.
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