L1 - U What Are Electromagnetic I Transients? ECE524...

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1 U I ECE524 Lecture 1 What Are Electromagnetic Transients? Power systems normally in steady-state » Or Quasi-steady-state Allows use of RMS phasors Switching, operations, faults, lightning, » Response frequencies from DC to MHz » Generally dies out rapidly (higher freq Introduction Spring 2012 1 » Generally dies out rapidly (higher freq.) Large voltage and currents are possible RLC response to change in voltage or current U I ECE524 Lecture 1 Analyzing Transients Understand the transient you want to model Good data to form detailed models Mathematical model of the system Solve coupled differential equations » Hand calculations in the LaPlace domain Introduction Spring 2012 2 » Hand calculations in the time domain » Time domain numerical circuit simulation » Frequency domain simulation
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2 U I ECE524 Lecture 1 Circuit Simulation Output often as waveforms Often want instantaneous peak values of v(t) and i(t) » Or in some cases energy » Missed with RMS or harmonic solutions Introduction Spring 2012 3 U I ECE524 Lecture 1 Transient Network Analyzer (TNA) Predates use of digital computers » Analog computer model » Hybrid: digital controls Real-time digital simulators Introduction Spring 2012 4 Expensive » Closed loop testing of control hardware
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3 U I ECE524 Lecture 1 Off-Line Time Domain Simulation Digital computer simulation of transients General purpose equation solvers: MATLAB, MathCAD Analog electronic and integrated circuits: SPICE, Saber Introduction Spring 2012 5 Not really designed for power system transients U I ECE524 Lecture 1 The Electromagnetic Transients Program-EMTP Hermann Dommel, Germany, then BPA
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L1 - U What Are Electromagnetic I Transients? ECE524...

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