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Section 20 Static Var Compensator
20.1 General Comments .............................................................................. 20-1
20.2 Applications ........................................................................................ 20-1
20.3 Computer Aspects ............................................................................... 20-2
20.3.1 Time Step ....................................................................... 20-2
20.3.2 Dimensioning ................................................................. 20-2
20.4 Structure .............................................................................................. 20-2
20.4.1 Overview ........................................................................ 20-2
20.4.2 Internal EMTP Node Names ........................................... 20-3
20.4.3 Control System Signal Names ....................................... 20-4
20.4.4 Output and Plot .............................................................. 20-4
20.5 Main Data File ..................................................................................... 20-5
20.6 SVC Module Files ................................................................................ 20-6
20.6.1 Overview ........................................................................ 20-6
20.6.2 Top Level Modules - SVCA or SVCB .............................. 20-6
20.6.3 Distribution Unit, ALLOCATOR ...................................... 20-10
20.6.4 Flip-Flop, BCOUNTER .................................................... 20-12
20.6.5 Binary Function with Hysteresis, BFHYST ..................... 20-13
20.6.6 Damped Filter, DAMPFILT ............................................. 20-14
20.6.7 Transformation from 3-Phase to 
(d,q)-components, DQTRNS ............................................ 20-15
20.6.8 TCR Current Measurement, ITCRMEAS ......................... 20-16
20.6.9 Measurement Circuit Type-A, MEASUREA .................... 20-17
20.6.10 Measurement Circuit Type-B, MEASUREB .................... 20-19
20.6.11 Phase Comparator Type-A, PHCOMPA .......................... 20-21
20.6.12 Phase Comparator Type-B, PHCOMPB ........................... 20-22
20.6.13 Proportional and Integral Regulator, PIREG ................... 20-24
20.6.14 Phase Locked Loop for One Phase, PLL1 ...................... 20-25
20.6.15 Phase Locked Loop for a 3-Phase System 
Type-A, PLLA ................................................................. 20-27
Section 20 Static Var Compensator
20.6.16 Phase Locked Loop for a 3-Phase System 
Type-B, PLLB ................................................................ 20-28
20.6.17 Potential Transformer, PT .............................................. 20-29
20.6.18 Measurement of a 3-Phase Voltage or Current, 
RMSMETER .................................................................... 20-30
20.6.19 Single Tuned Filter, STFILT ........................................... 20-31
20.6.20 Six-Pulse Delta-Connected TCR Unit, TCR6 ................. 20-32
20.6.21 Six-Pulse Delta-Connected TSC Unit, TSC6 .................. 20-34
20.6.22 TCR Firing Angle Calculation, TCRCONV ..................... 20-35
20.6.23 TCR Overcurrent Control, TCROVCUR .......................... 20-36
20.6.24 Firing Pulse Generator for a Six-Pulse 
TCR Unit, TCRPULS ....................................................... 20-38
20.6.25 Firing Pulse Generator for a Six-Pulse 
TSC Unit, TSCPULS ........................................................ 20-39
20.6.26 Secondary Overvoltage Limiter, UOVLIM ..................... 20-41
20.6.27 Voltage Response Filter Type-A, URFILTA ................... 20-42
20.6.28 Voltage Response Filter Type-B, URFILTB ................... 20-43
20.6.29 Undervoltage Strategy, UVSTRATEGY .......................... 20-43
20.6.30 Voltage Controlled Oscillator, VCO .............................. 20-45
20.6.31 Voltage Regulator, VREG .............................................. 20-47
20.6.32 Three-Phase Two-Winding Transformer, XFORM2W ... 20-49
20.6.33 Three-Phase Three-Winding Transformer, XFORM3W . 20-50
20.7 Initialization ........................................................................................ 20-51
20.8 Some Comments About Modules ....................................................... 20-52
20.9 TACS Signal Names ............................................................................ 20-52