Phần 17 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Ứng dụng tính toán Ổn định điện áp trên Phần mềm PSSE)

Phần 17 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Ứng dụng tính toán Ổn định điện áp trên Phần mềm PSSE)• PV Simulation Setup PV Simulation Setup • PV Analysis• Exporting the Results to MSExcel• Implementing a Specific PV Transfer• QV Simulation Setup QV Simulation Setup• QV Analysis

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A Division of Global Power

POWER SYSTEM STABILITY CALCULATION TRAINING

D 8 A li ti f V lt St bilit Day 8 – Application of Voltage Stability

July 15, 2013 Prepared by: Frida Ceja-Gomez

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OUTLINE

• PV Simulation Setup PV Simulation Setup

• PV Analysis

• Exporting the Results to MS-Excel

• Implementing a Specific PV Transfer

• QV Simulation Setup QV Simulation Setup

• QV Analysis

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PV Analysis Applications

4 PV SIMULATION SETUP

PV Analysis Applications

• Identify the low voltage transfer limit

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PV Analysis in PSS®E

maximum power transfer without causing a voltage

collapse

problem (dynamic analysis is not necessary)

assess voltage variations due to active power

changes

saved case file: Day5_savnw.sav

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Area 1 exports power

to the other two areas

we will perform PV

analysis for the power

transfer between Area 1

and Area 5

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Distribution Factor Data File

• In order to carry out a PV analysis, first we need to build

a distribution factor data file

• This file takes the contents of a set of linear network

analysis data files in preparation for a variety of

analyses, including PV and QV analyses

• The input required for the process of creating the

Distribution Factor file is contained in three data files:

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Special Data Records

the linear network analysis data files mentioned above

file is written to the Progress tab or the user specified output file

processing

Note that blank lines are ignored during the input file processing

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File Notational Conventions

option is in effect, can be changed by activity OPTN)

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Subsystem File

subsystems of the working case that we wish to

monitor and manipulate

SUBSYSTEM|SYSTEM [label]

(subsystem specification data record)

(subsystem specification data record) END

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• r refers to a floating point value the decimal

• r refers to a floating point value, the decimal

point is optional for a whole number

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Subsystem File

group of buses through the logical anding of two or

more of the five selection criteria described on the

• In the above structure the subsystem specification data In the above structure, the subsystem specification data

record is one of the simple record types (BUS, AREA,

ZONE, OWNER, KV, or the range of records)

• Note that the JOIN label is optional and not preserved in

the dfax file

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Subsystem File for our PV Simulation

• PV Analysis serves to study the effect on voltages PV Analysis serves to study the effect on voltages

of varying power transfers from one point to

another

subsystem, which is the one from which power is

exported

is the one to which we wish to transfer power

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(preceded by COM) to remind us the names and

numbers of the existing areas

FLAPCO1, which includes all elements in Area 1

comprises all elements in Area 5

elements in the specified area with a voltage

range between 230 and 500kV

used within a subsystem (AREA, ZONE,

KVRANGE) we need to use the JOIN structure

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Monitored Element Data File

flow or voltage violations, respectively

Individual branch:

[MONITOR] |BRANCH| FROM BUS bsid TO BUS bsid |CIRCUIT| ckid

All branches in an Area, Zone, Owner, KV range or Subsystem: , , , g y

[MONITOR] |BRANCHES| IN |AREA i|

|BREAKERS| |SUBSYSTEM label|

All ties from a specified subsystem or a pair of subsystems:

[MONITOR] TIES FROM |AREA i| TO |AREA i|

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• It is also possible to define an interface using the following block

END

specify sets of tie lines or individual branches, as shown in the

previous slide

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Set of buses outside a voltage band (r r define the upper and lower limits

Set of buses to be monitored for voltage limit violations (the voltage limit

definition is made at results post-processing stage:

[MONITOR] VOLTAGE LIMIT |ALL BUSES|

|AREA i|

|KV r|

|SUBSYSTEM label|

Set of buses having a given voltage drop and rise deviation thresholds

(the first r is the value of the voltage drop in per unit):

[MONITOR] VOLTAGE DEVIATION |ALL BUSES| r r

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Monitor File for our PV Analysis

it with extension mon

• Note that this file refers

to the subsystems we

defined in the sub file

monitoring the branches

and buses of each area

with a voltage between

230 and 500kV

• We also created an interface that monitors the ties

between Area 1 and Area 5

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Contingency Description Data File

• This file is used to define the contingencies we wish to study

CONTINGENCY label [r r]

(contingency event specification record) (contingency event specification record)

(contingency event specification record) (contingency event specification record) END

• The first r value represents the frequency in occurrence/year p q y y

and the second r value represents duration in hours

reliability assessment

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• In the above structure, the following contingency event In the above structure, the following contingency event

specification records can be used

Outaging an in-service non-transformer branch or two-winding

Outaging all in-service non-transformer branch or two-winding

transformer branch in one subsystem:

SINGLE |BRANCH| IN SUBSYSTEM |SUBSYSTEM label|

|LINE|

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Contingency File for our

two contingencies, as shown

to the right

Case 2

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Opening the PV Analysis window

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PV Analysis window options

• Set the initial

value so that the

program does not

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Creating the distribution factor data file

26 PV ANALYSIS IN PSS®E

Creating the distribution factor data file

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Defining the output file

• We can now We can now

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PV Results

30 PV ANALYSIS IN PSS®E

PV Results

• Note that the interface MW flow option Note that the interface MW flow option

shows us how much is the actual flow from

the sink to the source with each transfer

increment

• What is the maximum MW flow for the base

? case?

• What are the maximum MW flows for

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right of the plot

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EXAMPLE 1 – EXPORTING THE

EXAMPLE 1 – EXPORTING THE RESULTS TO MS-EXCEL

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34 EXPORTING THE RESULTS TO MS-EXCEL

Export results to Excel Module

section, it is hard to

manipulate the results inside

PSS®E

generate better reports and

graphics

folder as shown to the right

and open the module: Export

lt t E l results to Excel

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Exporting the results to MS-Excel

right will appear

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36 EXPORTING THE RESULTS TO MS-EXCEL

working directory

work properly

to export results to excel under the Power Flow, Reports

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• It is also possible to export PSS®E

results to Excel using Python

• Python allows us to select the data we

want to export and customize the Excel

fil

file

• Exporting PSS®E results to Excel

though this method will be covered later

on in the Python training

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Implementing a specific PV transfer

• Once we find the power transfer limit of a system

using PV analysis it is important to study the system

using PV analysis, it is important to study the system

performance at or near this point

• To do so, we will scale the load and generation in the

sink and source subsystems and run a power flow and

dynamic simulation

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Scaling the generation

40 IMPLEMENTING A PV TRANSFER

Scaling the generation

• Select Area 1 (the Select Area 1 (the

source) and click on

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Scaling the load

• Select Area 5 (the Select Area 5 (the

sink) and click on Go

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• Save the scaled Save the scaled

network with a

different name

this saved case file

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Verification

• Go to Power Flow, Reports, Area/Zone Based Report and generate an inter area

flow report for the original saved case file and for the scaled one

• Verify that the transfer from Area 1 to Area 5 is near the maximum value found

using PV Analysis

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• There is an option to automatically implement a power transfer p y p p

from a PV analysis

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• Specify the same dfax file, source, sink and dispatch method used for the PV

analysis

• Then specify the transfer increment and launch the transfer

• Note that this procedure changes the load or generation at the subsystem buses Note that this procedure changes the load or generation at the subsystem buses

that participate in the transfer

• After this process, you can save your sav file with a different name and perform

load flow and dynamic simulations to verify the system performance for this case y y y p

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EXAMPLE 1 – POWER FLOW

SIMULATION NEAR THE POINT

OF MAXIMUM TRANSFER

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Power Flow Simulation

simulation on the

scaled file

iterations for the

solution to converge

drastically scaled the

load and generation

is advisable to scale

generation and load in

small increments and

solve for the load flow

after every change

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the system with this

change in loading

more lines operating at

more than 95% of their

rating

buses are operating at

less then 0.95 pu

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Dynamic Simulation Setup

50 DYNAMIC SIMULATION NEAR THE POINT

Dynamic Simulation Setup

modifications create the

converted saved case file

suitable for dynamic

simulations (refer to the

dynamic simulation training

slides)

• Save this file with a different

name and open the dynamics

file

simulation solution

parameters and options

the output file and initialize

the dynamic simulation

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• In this case, let us

fault one of the

230kV tie lines

between Area 1 and

Area 5

disturbance, run the

simulation for 4

additional cycles

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Clearing the fault

branch that was

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Verifying the results

• Our dynamic simulation Our dynamic simulation

has been completed

• Let us plot the outputs to

see if the system is stable

near the point of

maximum transfer

created output file (.out)

be accessible in the plot

tree view

• First plot all the angles

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Plotting the results

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Analyzing the results

• It can be seen that all angles converge

• It was also confirmed that all voltages

converge to acceptable values

• Therefore, it can be said that the system , y

reaches stability following the loss of the

line from Bus 153 to Bus 3004 when the

power transfer from Area 1 to Area 5 is

near the maximum

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QV Analysis in PSS®E

required reactive power injection so that the

specified value

steady-state problem

file Day5 savnw sav

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Settings for switched shunts

60 QV SIMULATION SETUP

Settings for switched shunts

power is required to keep the bus at the desired

voltage, it is desirable to lock all switched shunts

at this bus only

which is why we wish to enable the switched

shunts at all other buses

switched shunts present

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Distribution factor file for QV analysis

• Similar to the PV analysis, it is necessary to create a

DFAX file for QV analysis

• In this case, a CON file is required to specify the

contingencies to study and a MON file is also needed

to select the elements we wish to monitor

• Since we are looking at a specific bus, we do not need g p

to specify a subsystem, so the SUB file is not required

file makes reference to subsystems

• For the following exercise, let us use the same files we

prepared for the PV Analysis of the previous section

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Opening the QV Analysis Window

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QV Analysis Results Window

window allows the

user to see the QV

plot of the specified

bus for the studied

contingencies

you want to see

and the plot will

appear on the

graph

• The plot can be p

modified the same

way as the PV plot

• The results can The results can

also be exported to

excel

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QV Analysis Results

66 QV ANALYSIS IN PSS®E

power needs to be

injected at bus 3004 to

maintain the voltage at

1pu for the base case?

quantity change for

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case as shown below

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QUESTIONS?

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Tiêu đề	Application of Voltage Stability
Tác giả	Frida Ceja-Gomez
Trường học	Global Power
Chuyên ngành	Power System Stability
Thể loại	Đào tạo
Năm xuất bản	2013
Thành phố	Unknown

Định dạng
Số trang	70
Dung lượng	4,17 MB