IEEE PSAP PTI data format

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Partial Description of the IEEE Common Data Format for the   
Exchange of Solved Load Flow Data
. L) h4 A! t" k$ U- DThe complete description can be found in the paper "Common Data
% J( u* `& \. m2 W% e0 h3 vFormat for the Exchange of Solved Load Flow Data", Working Group on a
Common Format for the Exchange of Solved Load Flow Data, _IEEE
Transactions on Power Apparatus and Systems_, Vol. PAS-92, No. 6,
November/December 1973, pp. 1916-1925.
The data file has lines of up to 128 characters. The lines are grouped
0 ~: t' P/ s- M5 r: h- S0 Ainto sections with section headers. Data items are entered in specific
columns. No blank items are allowed, enter zeros instead. Floating point
items should have explicit decimal point. No implicit decimal points
% a' a* S3 L: ]. Zare used.
# H# E. {2 L* rData type codes: A - Alphanumeric (no special characters)
; g) J( }9 o- h: j8 V, b& s6 a                 I - Integer
- b! E, r' m) n4 V' @1 {                 F - Floating point
                 * - Mandatory item
Title Data
==========
, h5 {# F& K- `; I% b7 W" wFirst card in file.
Columns  2- 9   Date, in format DD/MM/YY with leading zeros. If no date
                provided, use 0b/0b/0b where b is blank.
Columns 11-30   Originator's name (A)
Columns 32-37   MVA Base (F*)
Columns 39-42   Year (I)
3 b9 S5 b: I% t% C* z/ ~Column  44      Season (S - Summer, W - Winter)
Column  46-73   Case identification (A)
Bus Data *
1 `1 D* o0 P4 @5 O; i. |! U5 }! l==========
Section start card *:
1 ?2 j3 x( h# i---------------------
Columns  1-16   BUS DATA FOLLOWS (not clear that any more than BUS in
0 _3 f0 @6 v- Q% B, f                1-3 is significant) *
* ^$ p2 B, I. G( d( u" W  yColumns  ?- ?   NNNNN ITEMS (column not clear, I would not count on this)
$ \) T% [" i( r9 G! }1 D2 l$ eBus data cards *:
1 b" |' D, T7 {! r6 Q-----------------
8 S* ]' F5 q7 \8 {& ?+ C* JColumns  1- 4   Bus number (I) *
Columns  7-17   Name (A) (left justify) *
8 u8 }0 p$ t) l# GColumns 19-20   Load flow area number (I) Don't use zero! *
Columns 21-23   Loss zone number (I)
( W# I5 _" d3 IColumns 25-26   Type (I) *
                 0 - Unregulated (load, PQ)
* M! F& M6 ?. t, s9 g$ @. ~                 1 - Hold MVAR generation within voltage limits, (PQ)
                 2 - Hold voltage within VAR limits (gen, PV)
8 b7 G# G; a( m                 3 - Hold voltage and angle (swing, V-Theta) (must always
) L7 M4 l9 j/ E  j. G) C5 @                      have one)
) G, F# W( v9 t7 v# o! g/ hColumns 28-33   Final voltage, p.u. (F) *
. B; r2 w4 ~7 K# o$ yColumns 34-40   Final angle, degrees (F) *
% n! u+ i! z1 m* T* zColumns 41-49   Load MW (F) *
3 X4 B) W3 H5 `/ D0 A: w3 ^Columns 50-59   Load MVAR (F) *
Columns 60-67   Generation MW (F) *
# H8 i( I8 |4 B; ?; W, r2 A" g3 R& zColumns 68-75   Generation MVAR (F) *
Columns 77-83   Base KV (F)
( b* y; C& P. e- S/ w( @7 q. `7 GColumns 85-90   Desired volts (pu) (F) (This is desired remote voltage if
                this bus is controlling another bus.
) e/ A6 {5 z2 X: `( J; D) ^' kColumns 91-98   Maximum MVAR or voltage limit (F)
Columns 99-106  Minimum MVAR or voltage limit (F)
4 ~6 C; H: x3 [- |: gColumns 107-114 Shunt conductance G (per unit) (F) *
Columns 115-122 Shunt susceptance B (per unit) (F) *
Columns 124-127 Remote controlled bus number
Section end card:
5 J: X7 s5 \0 W! t; \-----------------
# [6 T; h" |8 z. K6 gColumns  1- 4   -999
Branch Data *
- F; I  C& L$ T2 }=============
Section start card *:
: @2 o$ e2 \2 D% R' Q9 m# r# w---------------------
  B9 v; I( `  q* f+ qColumns  1-16   BRANCH DATA FOLLOWS (not clear that any more than BRANCH
: J0 H1 A, V' w$ D) g8 c                is significant) *
& ~/ a- d4 ^3 C8 |& sColumns 40?- ?  NNNNN ITEMS (column not clear, I would not count on this)
6 c2 ~8 C* b+ f% g2 m7 ^Branch data cards *:
7 H* A5 W! g- g6 h--------------------
8 A7 ~' ~! `& {5 i) I+ t& |Columns  1- 4   Tap bus number (I) *
. e$ r7 o8 E+ `                 For transformers or phase shifters, the side of the model
                 the non-unity tap is on
Columns  6- 9   Z bus number (I) *
, `" l! B2 P7 O/ o                 For transformers and phase shifters, the side of the model
% D: u+ u6 h2 D$ C: @- d! H5 T                 the device impedance is on.
Columns 11-12   Load flow area (I)
) c1 U' [7 c/ z8 e( ~, F$ qColumns 13-14   Loss zone (I)
, C8 X, S, ~; Z; ^/ iColumn  17      Circuit (I) * (Use 1 for single lines)
: v3 i4 h9 I4 o& f2 `4 ^Column  19      Type (I) *
& Y) k& J) D8 p2 M                 0 - Transmission line
  Y$ _5 M1 [. ?" \" i, }9 d! w                 1 - Fixed tap
2 I. i; w( j3 U& V                 2 - Variable tap for voltage control (TCUL, LTC)
                 3 - Variable tap (turns ratio) for MVAR control
                 4 - Variable phase angle for MW control (phase shifter)
" e7 S& p$ a. F8 T# ?Columns 20-29   Branch resistance R, per unit (F) *
# u4 F) K& I4 _( d2 O, SColumns 30-40   Branch reactance X, per unit (F) * No zero impedance lines
8 G0 _  a- Y; a* K# eColumns 41-50   Line charging B, per unit (F) * (total line charging, +B)
Columns 51-55   Line MVA rating No 1 (I) Left justify!
$ n9 o5 x1 i3 |+ l% U! J8 Z/ cColumns 57-61   Line MVA rating No 2 (I) Left justify!
Columns 63-67   Line MVA rating No 3 (I) Left justify!
Columns 69-72   Control bus number
Column  74      Side (I)
                 0 - Controlled bus is one of the terminals
5 ^- n: E7 @& G0 ^( [# q3 g* U                 1 - Controlled bus is near the tap side
- C2 T& c  ^4 R/ `" S/ |                 2 - Controlled bus is near the impedance side (Z bus)
) v" \  T) i9 B8 e7 tColumns 77-82   Transformer final turns ratio (F)
7 K  U; p9 B1 q3 y6 NColumns 84-90   Transformer (phase shifter) final angle (F)
5 I2 k$ u& o' E, D7 _) [+ s, @# bColumns 91-97   Minimum tap or phase shift (F)
Columns 98-104  Maximum tap or phase shift (F)
4 u' ?% i6 J9 [0 u/ jColumns 106-111 Step size (F)
: |# f# Z9 A3 R1 r: q1 S2 X/ n& L# aColumns 113-119 Minimum voltage, MVAR or MW limit (F)
1 i# D+ w* n* s' F0 tColumns 120-126 Maximum voltage, MVAR or MW limit (F)
6 H; W' `# J6 {( O7 _Section end card:
& {3 i1 k) p( C/ @% b, B( U7 i-----------------
Columns  1- 4   -999
Loss Zone Data
==============
+ M# H4 t) w1 x* |) l9 _Section start card
2 K2 a, r/ ~5 y$ F------------------
% P- Y% K$ \+ b+ L/ U5 I' q6 AColumns  1-16   LOSS ZONES FOLLOWS (not clear that any more than LOSS
7 H4 y6 d0 a; `2 t% W2 M2 z                is significant)
; Z/ _+ j5 {7 d2 u- f2 g" |Columns 40?- ?  NNNNN ITEMS (column not clear, I would not count on this)
: `  m8 P+ m# C; U- m' RLoss Zone Cards:
0 I2 y: r8 C$ b6 Y----------------
Columns  1- 3   Loss zone number  (I)
Columns  5-16   Loss zone name (A)
! Z9 l' L5 S2 h: ASection end card:
% `8 ]5 g0 f! J2 b5 j% K-----------------
Columns  1- 3   -99
Interchange Data *
- q+ p8 F5 \1 c4 u& b& l==================
. |4 Z1 K6 i% _3 TSection start card
------------------
, j: w+ W) Q7 k/ Y# i; |3 G; \Columns  1-16   INTERCHANGE DATA FOLLOWS (not clear that any more than
                first word is significant).
Columns 40?- ?  NNNNN ITEMS (column not clear, I would not count on this)
% S. E: ~9 V: k1 X/ L1 c9 vInterchange Data Cards *:
-------------------------
Columns  1- 2   Area number (I) no zeros! *
; q& t# G2 x% |) P- p/ |Columns  4- 7   Interchange slack bus number (I) *
# Q, D% f& k9 q( M4 IColumns  9-20   Alternate swing bus name (A)
' x& l( ~% [5 r% ?Columns 21-28   Area interchange export, MW (F) (+ = out) *
! h. V! p) I0 i/ w+ a, l/ KColumns 30-35   Area interchange tolerance, MW (F) *
Columns 38-43   Area code (abbreviated name) (A) *
/ `3 d' ~$ u: ]6 tColumns 46-75   Area name (A)
Section end card:
8 Y- `2 f1 L' w5 {-----------------
Columns  1- 2   -9
Tie Line Data
=============
* \1 [% y+ H4 S6 [# Y- LSection start card
' V: ?1 |1 T4 g; y- e5 z. _------------------
Columns  1-16   TIE LINES FOLLOW (not clear that any more than TIE
                is significant)
Columns 40?- ?  NNNNN ITEMS (column not clear, I would not count on this)
2 @) Y' A' f, S9 D4 m3 yTie Line Cards:
0 M: j8 r7 R% z& s---------------
, d" j$ B8 X$ v) W( {8 S4 ~Columns  1- 4   Metered bus number (I)
7 O5 u8 l& m: \4 A* W, o: \Columns  7-8    Metered area number (I)
- O! L0 @- ?: Y$ h9 j' [4 T: ?Columns  11-14  Non-metered bus number (I)
0 `- j* M$ p: r& a6 bColumns  17-18  Non-metered area number (I)
Column   21     Circuit number
Section end card:
, d! f& {2 d' l- w. O( f' z-----------------
Columns  1- 3   -999
& \7 k7 N' X& R" |% W8 K* w+ _- f* Z) lEND OF DATA

PSAP File Format
May 20, 1993
5 Z( F3 a$ [" t; EThe PECO PSAP File Format is fully described in the _PJM Power System
Analysis Package Use's Guide_, available from the Philadelphia
# ?3 I, I9 |" m% i) _! t+ @( V) cElectric Company. The following is a rough description of the
2 [+ V$ G" I# a- k9 n+ d3 n8 Pmost important parts of the format.
3 f; A6 I) X% t2 R  C  lA PSAP data file is divided into sections by code cards. The code is
/ p/ _, J. I: Q) G) min the first three columns. There are something like 60 codes, of
which only four are described in this document.
The 1 code indicates that the next card is the case title. Only one
* X" }; l6 v. ?title is allowed per case.
The 4 card indicates that line data follows. The line data ends with
a 9999 card.
% [. X5 m# T9 I' bThe 5 card indicates that bus data follows. The bus data ends with
a 9999 card.
The 15 card indicates that area interchange data follows. The data ends with
a 9999 card.
  z( L3 y. d9 s1 YLine Data Card (Code 4 cards)
=============================
Cols    Data
9 `. [8 F0 T* x; {' ?/ _& O. l1-4     From bus number
6       Change code (blank in 4 section)
7       'C' if second card present for same line. Used for transformers.
9-12    To bus number
14      Circuit number (blank in 4 section)
16      'T' or 'F' - Load flow area of bus at this end of line gets losses.
' k; y$ J) N8 k/ G. V5 U18-23   Line resistance in percent of base. (NOT per unit.)
        (percent = 100 x per unit) Two default decimal places.
24-29   Line reactance, in percent. Two default decimal places.
$ v% `% D* T( U- K30-35   Line charging MVAR (total). Three default decimal places.
5 {( J, n; J; r36-40   Transformer tap (per unit turns ratio). Three default decimal
        places, 1000 = 1.000.
41-45   Min tap, for OLTC. Three default decimal places.
! t; d) r4 J0 ?& `& `46-50   Max tap, for OLTC. Three default decimal places.
51-55   Phase shift angle, for OL phase shifter. Two default decimal places.
56-60   Remote voltage control bus number. Negative if lower tap increases
1 e0 s: e! P; i# {- d% w        voltage of this bus.
61-64   Normal MVA rating
9 I! G4 y( D0 q+ y* r65-68   Emergency MVA rating
69-72   MVA Base. Default value 100 MVA if blank.
Second Line Card (follows 'C' in first card)
: B5 x4 {$ a  o4 V1 f7 A============================================
1-17    Same as first card, except no 'C'. Can be left blank.
35-40   Desired MVAR flow or Min voltage setpoint for OLTC.
: G1 {+ g8 o' d* L  a41-45   Min phase shifter degrees. Two default decimal places.
46-50   Max phase shifter degrees. Two default decimal places.
0 @$ p; T, ?9 B3 n2 {& t, n51-55   Desired MW flow for phase shifter.
- g# f) ~, E+ ]5 X' l; w* I57-60   Controlled line from bus.
62-65   Controlled line to bus.
67-70   Available taps (number of taps)
71-75   Maximum voltage setpoint. Three default decimal places.
8 K- \3 B: U/ ^3 S  O' h6 BBus Cards (Code 5 cards)
========================
1-4     Bus number
$ n' [) U7 u6 y9 C6       Change code (blank in 5 section)
6 L- R; c) [$ X) o  m# {7       Continue code (blank in 5 section)
5 K6 G" q: ?. v8       Regulated bus code:
         Blank - load (PQ) bus
% `2 S/ g# k6 Y. o5 s         1     - gen (PV) bus
1 p) M0 v* q) R; V) n% z; N         2     - swing (V-Theta) bus
: b9 c% L1 s8 t6 i; ?( D7 I10-21   Name
. {+ b& L( d4 |0 j- k23-26   Bus voltage (control setpoint or solved value).
        Three default decimal places.
6 y+ Q( L, t3 v% [27-30   Bus angle
8 g+ G' E/ Z  T9 B; J% F! g: [31-35   Generation MW
36-40   Generation MVAR (from solution)
41-45   Generation MVAR low limit
46-50   Generation MVAR high limit
51-55   Bus at which generation controls voltage
; s; C8 J2 ?/ z- y& l% q$ W  H56-60   Load MW
3 J8 t3 u; a+ z+ w+ {9 ^' u. a61-65   Load MVAR
66-70   Shunt MVAR. Reactors are minus.
71-72   Load flow area. (Used for area interchange and losses).
/ {( H% `) r; ?, HArea Interchange Cards (Code 15 cards)
: B5 O3 e- B9 ?======================================
3-4     Load flow area number
) X9 \2 g! I: D5-8     Swing bus for area interchange. Adjusts generation at this bus
        to meet area interchange requirement.
8 T+ }: \4 a8 q4 X7 Y9-14    Area exports, MW. (+ = out of area)
15-19   Area Interchange tolerance, MW
20-55   Area name
56-60   Area load (usually left blank)
61-65   Area losses (usually left blank)

! }+ p; j* a9 H- }. Y9 l

/ o" ?* {; j3 U" i, KDescription of the PTI Load Flow Data Format
2 a. d& d& @+ ~7 B  K# \============================================
% k: E( ^: X% b8 t3 \' ]% _Note that PTI reserves the right to change the format at any time.
For use with the IEEE 300 bus test case in PTI format.
# u* l  l' o) x! WCase Identification Data
( ]( f6 b& C/ m8 U: F9 J4 R========================
First record: IC,SBASE
IC - 0 for base case, 1 for change data to be added
* S* R3 ]! Z3 t! M# M SBASE - System MVA base
Records 2 and 3 - two lines of heading, up to 60 characters per line
Bus Data
========
( Z. X+ N# }" x8 }  T* o4 X2 ~1 kBus data records, terminated by a record with a bus number of zero.
- \: V0 d  [! n& fI,IDE,PL,QL,GL,BL,IA,VM,VA,'NAME',BASKL,ZONE
I - Bus number (1 to 29997)
IDE - Bus type
        1 - Load bus (no generation)
* b' Y% r' _$ ~4 z        2 - Generator or plant bus
/ `( P+ e/ m# V" O! S7 w# F2 i        3 - Swing bus
        4 - Islolated bus
PL - Load MW
) Q9 K+ K; V% O9 t# w1 h- e* H: J QL - Load MVAR
6 W% n* t% I1 _& U: \- |- ~ GL - Shunt conductance, MW at 1.0 per unit voltage
BL - Shunt susceptance, MVAR at 1.0 per unit voltage. (- = reactor)
! k1 e5 W% e9 u6 a7 x- ]% { IA - Area number, 1-100
. }, A/ K9 t9 f% H VM - Voltage magnitude, per unit
/ `1 J5 f1 P5 J2 B5 ^  E4 u VA - Voltage angle, degrees
NAME - Bus name, 8 characters, must be enclosed in quotes
BASKV - Base voltage, KV
ZONE - Loss zone, 1-999
/ [) c* i( K7 _Generator Data
==============
# G3 L8 D  h( _8 kGenerator data records, terminated by a generator with an index of zero.
I,ID,PG,QG,QT,QB,VS,IREG,MBASE,ZR,ZX,RT,XT,GTAP,STAT,RMPCT,PT,PB
* F+ a7 @& g# g0 ^7 WI - Bus number
ID - Machine identifier (0-9, A-Z)
* M7 d5 s8 k9 h& T( [/ S* wPG - MW output
% c: G( O+ a* d3 a5 h. NQG - MVAR output
! j- q4 I$ K, b( j; Y  i% eQT - Max MVAR
- T/ r  B6 H" r8 A( }QB - Min MVAR
VS - Voltage setpoint
" |  n0 J+ j( i9 F; |3 oIREG - Remote controlled bus index (must be type 1), zero to control own
  ?- Y5 L, B, \; ? voltage, and must be zero for gen at swing bus
MBASE - Total MVA base of this machine (or machines), defaults to system
& w7 ^2 x3 C1 z: G MVA base.
ZR,ZX - Machine impedance, pu on MBASE
- g4 m+ ]2 H5 }RT,XT - Step up transformer impedance, p.u. on MBASE
$ y% A3 L' B. F6 h1 j1 B# b, p- AGTAP - Step up transformer off nominal turns ratio
STAT - Machine status, 1 in service, 0 out of service
RMPCT - Percent of total VARS required to hold voltage at bus IREG
  Z2 [- O+ {7 p1 O; S! p/ w to come from bus I - for remote buses controlled by several generators
) ^  [; A/ K3 \! w( M. `PT - Max MW
PB - Min MW
' L5 D! X1 v7 k& r2 sBranch Data
===========
: U# ]( t) R+ Z" q, NBranch records, ending with a record with from bus of zero
I,J,CKT,R,X,B,RATEA,RATEB,RATEC,RATIO,ANGLE,GI,BI,GJ,BJ,ST
I - From bus number
J - To bus number
& z( w7 z! i$ O, d. ?& G7 a, UCKT - Circuit identifier (two character) not clear if integer or alpha
$ I% v/ ~& I" Y+ k* w) I" Q8 J: oR - Resistance, per unit
X - Reactance, per unit
3 l0 C$ s3 F; f' dB - Total line charging, per unit
% k9 M1 u/ R* a! h/ F5 }6 g; Y& \RATEA - MVA rating A
RATEB, RATEC - Higher MVA ratings
RATIO - Transformer off nominal turns ratio
ANGLE - Transformer phase shift angle
( u/ ~) ?9 V- \: Q" Z2 PGI,BI - Line shunt complex admittance for shunt at from end (I) bus, pu.
GJ,BJ - Line shunt complex admittance for shunt at to end (J) bus, pu.
ST - Initial branch status, 1 - in service, 0 - out of service
Transformer Adjustment Data
===========================
+ l( D  ~" S% f" v: iEnds with record with from bus of zero
7 c. l% d5 z* f  }  HI,J,CKT,ICONT,RMA,RMI,VMA,VMI,STEP,TABLE
1 j# y" U! U7 A7 H* I) l8 S9 F& P0 qI - From bus number
J - To bus number
( h4 T+ X8 k+ ?) S# O2 qCKT - Circuit number
7 a; A, O4 w7 }2 r8 iICONT - Number of bus to control. If different from I or J, sign of ICONT
determines control. Positive sign, close to impedance (untapped) bus
7 I% G" D/ i2 X of transformer. Negative sign, opposite.
6 Z; y& A; C8 i6 l6 E& ~' [RMA - Upper limit of turns ratio or phase shift
  _& {& W8 Y* Q. C$ ]RMI - Lower limit of turns ratio or phase shift
: g  c+ z% i! g% J3 s5 c- o. p6 {0 n$ DVMA - Upper limit of controlled volts, MW or MVAR
VMI - Lower limit of controlled volts, MW or MVAR
8 W: Y, `7 I* J( m% u) `STEP - Turns ratio step increment
TABLE - Zero, or number of a transformer impedance correction table 1-5
8 n: u0 U' F; V3 ^Area Interchange Data
/ F# g' a% I0 V  {; t=====================
Ends with I of zero
% x2 `& R* A3 M7 u2 ]4 UI,ISW,PDES,PTOL,'ARNAM'
I - Area number (1-100)
ISW - Area interchange slack bus number
  p1 k3 Z9 a( YPDES - Desired net interchange, MW + = out.
PTOL - Area interchange tolerance, MW
ARNAM - Area name, 8 characters, enclosed in single quotes.
DC Line Data
============
% ?6 U, B: O$ WEnds with I of zero
3 Z) d6 W* L' M+ a/ v& X' }Each DC line has three consecutive records
$ k* \% t4 C+ t' p7 x; V" \1 ]I,MDC,RDC,SETVL,VSCHD,VCMOD,RCOMP,DELTI,METER
IPR,NBR,ALFMAX,ALFMN,RCR,XCR,EBASR,TRR,TAPR,TPMXR,TPMNR,TSTPR
IPI,NBI,GAMMX,GAMMN,RCI,XCI,EBASI,TRI,TAPI,TPMXI,TPMNI,TSTPI
I - DC Line number
MDC - Control mode 0 - blocked 1 - power 2 - current
- l  p2 j' x/ W! u! U1 sRDC - Resistance, ohms
SETVL - Current or power demand
VSCHD - Scheduled compunded DC voltage, KV
VCMOD - Mode switch DC voltage, KV, switch to current control mode below this
RCOMP - Compounding resistance, ohms
5 M8 r- |  G, m7 J7 C9 B5 t6 IDELTI - Current margin, per unit of desired current
6 ^0 a9 q% a) K, g9 r# Z, cMETER - Metered end code, R - rectifier I - Inverter
! t: U! f# M, D$ E+ CIPR - Rectifier converter bus number
NBR - Number of birdges is series rectifier
ALFMAX - Maximum rectifier firing angle, degrees
/ `$ U1 }- H/ R1 f: t8 b* wALFMN - Minimum rectifier firing angle, degrees
1 c5 p! I) w1 ]% `6 fRCR - Rectifier commutating transformer resistance, per bridge, ohms
* p% |, ^, x, V. f1 a# m* W' v: S8 uXCR - Rectifier commutating transformer reactance, per bridge, ohms
EBASR - Rectifier primary base AC volts, KV
TRR - Rectifier transformer ratio
TAPR - Rectifier tap setting
TPMXR - Maximum rectifier tap setting
TPMNR - Minimum rectifier tap setting
TSTPR - Rectifier tap step
7 k% m' S$ b+ \" {Third record contains inverter quantities corresponding to rectifier
4 Z' n+ i/ o" m' L! Cquantities above.
' H& }7 b0 V* b8 ]Switch Shunt Data
* p$ D9 e7 S- ?0 o' o3 p# H=================
Ends with I = 0.
: r3 Z/ O- [. nI,MODSW,VSWHI,VSWLO,SWREM,BINIT,N1,B1,N2,B2...N8,B8
I - Bus number
; ]$ l3 [  p8 y: u, U/ |MODSW - Mode 0 - fixed 1 - discrete 2 - continuous
VSWHI - Desired voltage upper limit, per unit
* |1 J! y! Z6 P! l! Z$ x8 YVSWLO - Desired voltage lower limit, per unit
2 U' E, ^  U: `5 ]/ Q1 W! w% Z$ WSWREM - Number of remote bus to control. 0 to control own bus.
VDES - Desired voltage setpoint, per unit
# U& {  C, t# m( tBINIT - Initial switched shunt admittance, MVAR at 1.0 per unit volts
N1 - Number of steps for block 1, first 0 is end of blocks
* z1 }" ?+ L$ H; q; F& XB1 - Admittance increment of block 1 in MVAR at 1.0 per unit volts.
- x  t7 k; E! u) i1 l0 ZN2, B2, etc, as N1, B1

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