Project InstructionsFinal

8/10/2019 Project InstructionsFinal

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Power System Simulation for Engineers (PSS/E version 30)

Here are instructions for accessing and using the PSS/E-30 software. On-campus students shouldaccess this software at any of the computers in the lab of oo!er rooms ""#$ or "#"#.

%ou should coordinate with your group members to limit the number of simultaneous programuses at any gi!en time &the limit by license is #0'. Also, make sure that you quit the programwhen you are no longer using it. Otherwise it uses up one of the #0 users and someone else maynot be able to get to it.

". (og on to your computers. %ou can find this software &use any one')

a. *n the start menu. +o to start Programs PSSE 30.1 PSSE (Power Flow)&,his is an icon with a white bac ground'

b. *n the start menu. +o to start Programs PSSE 30.1 PSSE 30 CommandProm t. &,his will open a ommand Prompt. ,ype PSSE 30 there.'

c. +o to C!"Program Files"P#$"PSSE30"PSS%$& and lic on the PSSE (PowerFlow)' icon. & n icon with a white bac ground'

#. ,o !iew already e1isting cases - +o to File en . %ou will get a list of already e1istingcases. Select any case that you would wish to !iew. ,hese files ha!e the e1tension.sav' . &,here are lots of other files with different e1tensions. 2o not open those. %oumight want to use those at a later stage'

3. ,o create a new file lic File &ew . small dialog bo1 with two option buttons will

be opened. Select the option ase and clic O4.

5. ,his will open a %uild &ew Case dialog bo1. Select the base 67 as 100' from the%ase *+, drop down list bo1. ,hen there will be two blan spaces corresponding to

Heading line " and heading line #. %ou may lea!e these te1t bo1es blan and lic O4.

$. ,his will get you to the spreadsheet interface where you are going to build your newcase.

8. 9ow you can start modeling a power system. #o -uild a ase you need t e followinginformation!

a. %us ata!"' %ase +2 4S unt (*5)2 %4S unt (*+,6). 9ote that the last two

parameters of a bus are not re:uired. ;ut you must ha!e the data about bus;ase 47 for e!ery bus.

#' %ou must also now the type of the buses. i.e. whether it is a swing bus &one of the buses ha!ing a generator for which you designate !oltage magnitude andangle' or a P7 bus &buses ha!ing a generator but not designated as the swing

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bus for which you designate real power and !oltage magnitude' or a P< bus&generally a load bus but sometimes not) it is a bus for which you designate

both real and reacti!e power= such a bus may or may not ha!e load and for such a bus the real and reacti!e power is designated as 0 0'.

b. %ran ata &,ransmission lines')

"' From bus and #o bus numbers.#' 62 72 and 8ine arging !alues in per unit.

c. 8oad ata !"' ,he %us num-er' to which it is connected.#' P &in 6>' and 9 &67 ?' of the load.

d. enerator ata !"' ,he %us num-er' to which it is connected.#' +enerator 6eal Power 6ating &in 6>'. 6a1imum and minimum limits for

reacti!e power &in 67 r'

e. #ransformer ata!From bus and #o bus numbers

@. Once you are done with entering all the data for the power system modeling you cansa!e this case file. ?emember to sa!e the file !ery often so that you do not loose thedata you ha!e entered.

A. ,o sa!e lic File Save from the Bile menu. ,his will open a Save / S ow networ: data' dialog bo1. ,his dialog bo1 will ha!e a lot of ,abs on the top. %ou may select the

Case ata tab. Cnder this tab there is a te1t bo1 meant to enter your fileDs destination.%ou may clic on the bo1 that is on the right-hand side of this te1t bo1 with 3 dots on itto select your destination. %ou may preferably store your file in the E7,*P8E'folder. ;efore storing there gi!e a suitable filename to your case e.g. psseflow etc.fter entering a suitable filename you should clic PE&'. ,his will show thedestination of your new file in the estination' te1t bo1 of the Save / S ow networ: data' dialog bo1. 9ow clic on O4.

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%uilding a ase in PSS/E!

,his is illustrated with an e1ample. onsider the power system diagram shown below.

,his power system has 8 ;uses # generating units connected # transformers # loads and $transmission lines. Our ob ecti!e is to model this power system using PSS/E and thereby we canconduct many studies on this networ using the simulation facilities of PSS/E.

>hen you create a new case using the File &ew command you will get a spreadsheet interface.

%ou will find a lot of ,abs at the bottom of this spread sheet !iew which corresponds to rea;uses ;ranches B ,S etc. mong those the tabs that we use are) &follow the sameorder while creating the case')

". ;uses#. ;ranches3. (oads5. 6achines$. Plants8. #- >inding ,ransformer @. reasA. Fones

G. Owners,he last three are optional. Bor the sa e of completion we can fill those three spreadsheets too.

1. %us ata!

,he spread sheet corresponding to ;uses will ha!e many columns in which you are re:uired toenter the data corresponding to e!ery bus in the system. %ou need not enter all the data but onlythe data that are mandatory. Others will ha!e some default !alues that the software assumes while

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sol!ing the Power Blow case.

a. +i!e e!ery bus a %us &um-er' . Bollow the numbering that is gi!en in the diagram. b. +i!e the %us &ames' as you wish. %ou must type the names within single :uotes. E1.

;CS"D etc.

c. Enter the %us +' in the 3rd column. ,he nominal 47 for buses " and # are "3.A 47and for the remaining 5 buses it is 8G 47.

d. Once you enter the 47 !alues you can enter the ,rea num-er' to which the bus belongs. ,his is of !ery great significance when it comes to a !ery large system. Hereyou can model e!erything in a single area. So you can fill " under the rea 9umbercolumn for e!ery bus. %ou need not fill in the ne1t column corresponding to the rea

9ame .e. %ou can also model e!erything in a single ;one num-er . %ou may assign it as " for

e!ery bus. &2i!iding the whole networ into different areas or Iones is at the discretionof the indi!idual modeling the system.' %ou need not fill the Fone 9ame column.

f. %ou can also model e!erything in a single wner &um-er' . %ou may ust fill " here.%ou need not fill in the name under Owner 9ame column.

g. Once you ha!e entered the abo!e data you may lea!e the rest of the columns free. ,heywill ta e their default !alues.

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PSS/E will read it from the ;uses spreadsheet automatically.c. +i!e $d' to e!ery branch. ,his can be a mere number or can also be an alphanumeric

!alue ha!ing length of # characters.d. ,hen fill in the successi!e columns with the 62 72 and C arging data. ,ll in er unit.e. ,he status of all the braches shall be $n' to start with . (8ater we will want to disa-le

one of t ese lines2 i.e.2 we will want to simulate t e outage or removal of a line.)f. %ou need not fill in any other columns.

Bollow this procedure for e!ery branch. Enter all these data for the first branch and then go to thene1t row to enter data for the second. 2o this for e!ery branch in successi!e rows. ,he data for all

branches are ?K" ohm LK"0 ohm and ;K0.00# mho. %ou must find the er unit values for ?L and the line charging admittance ;/#.

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E4winding' tab toenter the data for the transformers.

@. #ransformer data!

a. ,his is !ery similar to that of entering the branch data. Enter the From %us &um-er

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and #o %us &um-er in column " and 3 respecti!ely. %ou may again lea!e the columnscorresponding to their names free.

b. +i!e an $d' for the ,ransformer in the ne1t column.c. +i!e a &ame for the transformer within single :uotes e.g. ,rans"D etc.d. hec the status .

e. ,hen go to column $m edan e $/ ode lea!ing a few columns free in the middle.f. Select ; u (system -ase) from the drop down list bo1.g. ,hen select A u (system -ase)' from the drop down list bo1 in the ne1t column.h. ,hen fill in the data for 7 ( u)' in the respecti!e column. &,his data is found by

calculating L/Fbase . ,his is done only if you are pro!ided with the LD !alues for thetransformer windings. *f no !alues are gi!en then ust lea!e it free'

i. ,hen enter "00 in the column named 6ate ,' for both the transformers. ,heremaining columns need not be filled. ,hey will assume their default !alues.

,his procedure should be followed for all the transformers in the system. *n our e1ample we ha!eonly two transformers) one is connected between buses " and 3 and another connected between

buses # and 5.

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fter entering the area data you may enter the data for Fone by clic ing on the ;one' ,ab.

D. ;one ata!Enter the ;one &um-er and the ;one &ame .

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nswer the following :uestions)a. ompute the systemDs admittance matri1 element %33.

b. >hat is the generation at buses " and #

c. %ou should find that the numerical !alue of the bus # generation is a whole number butthat of bus " is not. >hy is this

d. 2oes the sum of the real power generation e:ual to the sum of the real power loadE1plain.

e. >hat are the p.u !oltage magnitudes of buses " and # >hy

f. re the bus " and # generators regulating *n other words are their reacti!e generationle!els within the physical limitations of the generator

g. >hich two buses ha!e the lowest pu !oltage magnitude E1plain.

h. 2oes any bus ha!e a higher pu !oltage than the generator &source' buses E1plain.

i. >hich line has the largest angular separation across it >hy

. ompute the line charging current at bus $ associated with line "-$. lso calculate thereacti!e power supplied by this line charging capacitance at bus $ &refer to the -e:ui!alent line representation'.

. alculate the current *35 in the line 3-5. Csing the !oltage at bus 3 &from the power flow'calculate P35 and


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, endi< ,

How to reate t e entire system diagram in PSS/E!

fter sol!ing the case you ha!e built the entire system diagram can be obtained by the followingsteps)". lic - FileI&ew . small dialog bo1 with two option buttons will be opened. Select the

option iagram and clic O4. ,his will get you to the diagram interface where you aregoing to build your system diagram.

#. lic ,uto raw button & ' in the toolbar and there will be the cross cursor in theinterface. 9ow clic on the blan area and this will open a Sele t %us dialog bo1. %ou mayclic the bo1 named Sele t and this will open another %us Sele tion dialog bo1. %oumay choose any bus that you ha!e already built in the left part of this dialog bo1 and thenclic O4. 9ow in the Sele t %us dialog bo1 the bus number which you ust chose appearsin the te1t bo1. lic O4.

3. 9ow the diagram related to the chosen bus shows in the interface.5. ,o ad ust the position of the diagram clic Sele t button & ' in the toolbar or press Esc

on the eyboard and then you can ma e ad ustment in the interface.$. %ou get all the connections related to e!ery bus by repeating the steps # to 5. Binally you get

the whole system diagram as shown below.

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, endi< %1,his test is done by repetiti!ely increasing the load at the buses $ and 8 and running the powerflow. Each time ma e the increase in relati!ely small increments say #0 &multiply by ".#' for

the real power &and #0 for the reacti!e power so that tanTK


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, endi< %>

How to draw P+ urve in PSS/E!(,he files needed for this part will be pro!ided by the instructor. )

>hen you identify the ma1imum loading !alues at bus $ and bus 8 please use the followingsteps)". *n PSS/E lic U Power Flow Solution P+ analysis ,his will open a P+ ,nalysis

dialog bo1.#. *n the section of #ransfer dis at met ods for the option of For study ( sour e')

system select Su-system ma ines (*5) = for the option of For o osing ( sin:')system select Su-system load .

3. Bor the option of $nitial transfer in rement (*5) &which is in the middle-right part of theP+ ,nalysis dialog bo1' select 30.00 .

5. *n the section of $n ut data files clic Create F,7 ,his will open a %uildingistri-ution Fa tor ata File dialog bo1. *n the section of $n ut files for the option of Su-system des ri tion data clic the right bo1 with 3 dots on it to select the [email protected]

file and then clic en . Bor the option of *onitored element data clic the right bo1with 3 dots on it to select the EE303.mon file and then clic en . Bor the option of Contingen y des ri tion data clic the right bo1 with 3 dots on it to select theEE303. on file and then clic en . Bor the option of istri-ution fa tor data out ut

file clic the right bo1 with 3 dots on it to select the [email protected]< file and then clic en .fter finishing all selections abo!e clic button at the bottom of %uildingistri-ution Fa tor ata File dialog bo1.

$. 9ow bac to P+ ,nalysis dialog bo1 for the option of ut ut file (results) &which is atthe bottom of P+ ,nalysis dialog bo1' clic the right bo1 with 3 dots on it to select the

-us@. v file and then clic en .8. lic o . ,hen the P+ 6esults dialog bo1 will be opened.@. bout the P+ 6esults dialog bo1 in the section of #y e of results choose %us

voltages . *n the section of Contingen ies choose %,SE C,SE ?>0.00 %,SE C,SE0 such that this option becomes dar blue.

A. *n the section of %uses you can choose bus $ and then the P+ Curve a-out -us @ will beshown at the bottom of the P+ 6esults dialog bo1. Brom this P+ Curve you can find thema1imum loading !alue at bus $.

G. %ou can obtain the P+ Curve a-out -us B by following step" to step@.& #E(im ortant)!&"' *nste ? for the option of Su-system des ri tion data clic the right bo1 with 3 dots

on it to select the -usB.su- file and then clic en . Bor the option of istri-ution fa tor data out ut file clic the right bo1 with 3 dots on it to select the-usB.df< file and then clic en .

' *nste @ for the option of ut ut file (results) clic the right bo1 with 3 dots on it toselect the -usB. v file and then clic en .

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